merge: resolve conflict with origin/main

Problem: the README and vimdoc presets list omitted `plantuml` and
`mermaid` after both were added.

Solution: add both presets to the vimdoc table and the README features
blurb.

.luarc.json

@@ -4,5 +4,6 @@
   "diagnostics.globals": ["vim", "jit"],
   "workspace.library": ["$VIMRUNTIME/lua", "${3rd}/luv/library"],
   "workspace.checkThirdParty": false,
+  "workspace.ignoreDir": [".direnv"],
   "completion.callSnippet": "Replace"
 }

.styluaignore

@@ -0,0 +1 @@
+.direnv/

README.md

@@ -1,17 +1,19 @@
 # preview.nvim
 
-**Async document compilation for Neovim**
+**Universal document previewer for Neovim**
 
-An extensible framework for compiling documents (LaTeX, Typst, Markdown, etc.)
+An extensible framework for compiling and previewing _any_ documents (LaTeX,
-asynchronously with error diagnostics.
+Typst, Markdown, etc.)—diagnostics included.
+
+<video src="https://github.com/user-attachments/assets/3b4fbc31-c1c4-4429-a9dc-a68d6185ab2e" width="100%" controls></video>
 
 ## Features
 
 - Async compilation via `vim.system()`
-- Built-in presets for Typst, LaTeX, Markdown, and GitHub-flavored Markdown
+- Built-in presets for Typst, LaTeX (latexmk, pdflatex, tectonic), Markdown,
-- Compiler errors as native `vim.diagnostic`
+  GitHub-flavored Markdown, AsciiDoc, PlantUML, Mermaid, and Quarto
-- User events for extensibility (`PreviewCompileStarted`,
+- Compiler errors via `vim.diagnostic` or quickfix
-  `PreviewCompileSuccess`, `PreviewCompileFailed`)
+- Previewer auto-close on buffer deletion
 
 ## Requirements
 
@@ -19,8 +21,18 @@ asynchronously with error diagnostics.
 
 ## Installation
 
-Install with your package manager of choice or via
+With lazy.nvim:
-[luarocks](https://luarocks.org/modules/barrettruth/preview.nvim):
+
+```lua
+{
+  'barrettruth/preview.nvim',
+  init = function()
+    vim.g.preview = { typst = true, latex = true }
+  end,
+}
+```
+
+Or via [luarocks](https://luarocks.org/modules/barrettruth/preview.nvim):
 
 ```
 luarocks install preview.nvim
@@ -37,35 +49,35 @@ luarocks install preview.nvim
 **Q: How do I define a custom provider?**
 
 ```lua
-require('preview').setup({
+vim.g.preview = {
-  typst = {
+  rst = {
-    cmd = { 'typst', 'compile' },
+    cmd = { 'rst2html' },
     args = function(ctx)
-      return { ctx.file }
+      return { ctx.file, ctx.output }
     end,
     output = function(ctx)
-      return ctx.file:gsub('%.typ$', '.pdf')
+      return ctx.file:gsub('%.rst$', '.html')
     end,
   },
-})
+}
 ```
 
 **Q: How do I override a preset?**
 
 ```lua
-require('preview').setup({
+vim.g.preview = {
   typst = { env = { TYPST_FONT_PATHS = '/usr/share/fonts' } },
-})
+}
 ```
 
 **Q: How do I automatically open the output file?**
 
 Set `open = true` on your provider (all built-in presets have this enabled) to
-open the output with `vim.ui.open()` after the first successful compilation. For
+open the output with `vim.ui.open()` after the first successful compilation in
-a specific application, pass a command table:
+toggle/watch mode. For a specific application, pass a command table:
 
 ```lua
-require('preview').setup({
+vim.g.preview = {
   typst = { open = { 'sioyek', '--new-instance' } },
-})
+}
 ```

doc/preview.nvim.txt

@@ -1,244 +0,0 @@
-*preview.nvim.txt*                    Async document compilation for Neovim
-
-Author:  Barrett Ruth <br.barrettruth@gmail.com>
-License: MIT
-
-==============================================================================
-INTRODUCTION                                                    *preview.nvim*
-
-preview.nvim is an extensible framework for compiling documents asynchronously
-in Neovim. It provides a unified interface for any compilation workflow —
-LaTeX, Typst, Markdown, or anything else with a CLI compiler.
-
-The plugin ships with zero provider defaults. Users must explicitly configure
-their compiler commands. preview.nvim is purely an orchestration framework.
-
-==============================================================================
-REQUIREMENTS                                          *preview.nvim-requirements*
-
-- Neovim >= 0.11.0
-- A compiler binary for each configured provider (e.g. `typst`, `latexmk`)
-
-==============================================================================
-SETUP                                                  *preview.nvim-setup*
-
-Load preview.nvim with your package manager. For example, with lazy.nvim: >lua
-    {
-      'barrettruth/preview.nvim',
-    }
-<
-Call |preview.setup()| to configure providers before use.
-
-==============================================================================
-CONFIGURATION                                      *preview.nvim-configuration*
-
-Configure via `require('preview').setup()`.
-
-                                                            *preview.setup()*
-setup({opts?})
-
-  `opts` is a table where keys are preset names or filetypes. For each
-  key `k` with value `v` (excluding `debug`):
-
-  - If `k` is a preset name and `v` is `true`, the preset is registered
-    as-is under its filetype.
-  - If `k` is a preset name and `v` is a table, it is deep-merged with
-    the preset and registered under the preset's filetype.
-  - If `k` is not a preset name and `v` is a table, it is registered
-    directly as a custom provider keyed by filetype `k`.
-  - If `v` is `false`, the entry is skipped (no-op).
-
-  See |preview.nvim-presets| for available preset names.
-
-  Fields:~
-
-  `debug`            boolean|string   Enable debug logging. A string value
-                                    is treated as a log file path.
-                                    Default: `false`
-
-                                                    *preview.ProviderConfig*
-Provider fields:~
-
-  `cmd`              string[]         The compiler command (required).
-
-  `args`             string[]|function  Additional arguments. If a function,
-                                      receives a |preview.Context| and returns
-                                      a string[].
-
-  `cwd`              string|function   Working directory. If a function,
-                                      receives a |preview.Context|. Default:
-                                      git root or file directory.
-
-  `env`              table             Environment variables.
-
-  `output`           string|function   Output file path. If a function,
-                                      receives a |preview.Context|.
-
-  `error_parser`     function          Receives (output, |preview.Context|)
-                                      and returns vim.Diagnostic[].
-
-  `errors`           false|'diagnostic'|'quickfix'
-                                      How parse errors are reported.
-                                      `false` suppresses error handling.
-                                      `'quickfix'` populates the quickfix
-                                      list and opens it. Default:
-                                      `'diagnostic'`.
-
-  `clean`            string[]|function  Command to remove build artifacts.
-                                       If a function, receives a
-                                       |preview.Context|.
-
-  `open`             boolean|string[]   Open the output file after the first
-                                       successful compilation. `true` uses
-                                       |vim.ui.open()|. A string[] is run as
-                                       a command with the output path appended.
-
-                                                        *preview.Context*
-Context fields:~
-
-  `bufnr`   integer    Buffer number.
-  `file`    string     Absolute file path.
-  `root`    string     Project root (git root or file directory).
-  `ft`      string     Filetype.
-  `output`  string?    Resolved output file path (set after `output`
-                       is evaluated, available to `args` functions).
-
-Example enabling presets:~
->lua
-    require('preview').setup({ typst = true, latex = true, github = true })
-<
-
-Example overriding a preset field:~
->lua
-    require('preview').setup({
-      typst = { open = { 'sioyek', '--new-instance' } },
-    })
-<
-
-Example with a fully custom provider (key is not a preset name):~
->lua
-    require('preview').setup({
-      rst = {
-        cmd = { 'rst2html' },
-        args = function(ctx)
-          return { ctx.file }
-        end,
-        output = function(ctx)
-          return ctx.file:gsub('%.rst$', '.html')
-        end,
-      },
-    })
-<
-
-==============================================================================
-PRESETS                                                *preview.nvim-presets*
-
-preview.nvim ships with pre-built provider configurations for common tools.
-Import them from `preview.presets`:
-
-  `presets.typst`              typst compile → PDF
-  `presets.latex`              latexmk -pdf → PDF (with clean support)
-  `presets.markdown`           pandoc → HTML (standalone, embedded)
-  `presets.github`             pandoc → HTML (GitHub-styled, `-f gfm` input)
-
-Enable presets with `preset_name = true`:
->lua
-    require('preview').setup({ typst = true, latex = true, github = true })
-<
-
-Override individual fields by passing a table instead of `true`:
->lua
-    require('preview').setup({
-      typst = { env = { TYPST_FONT_PATHS = '/usr/share/fonts' } },
-    })
-<
-
-==============================================================================
-COMMANDS                                              *preview.nvim-commands*
-
-:Preview [subcommand]                                             *:Preview*
-
-    Subcommands:~
-
-    `compile`    Compile the current buffer (default if omitted).
-    `stop`       Kill active compilation for the current buffer.
-    `clean`      Run the provider's clean command.
-    `toggle`     Toggle auto-compile on save for the current buffer.
-    `open`       Open the last compiled output without recompiling.
-    `status`     Echo compilation status (idle, compiling, watching).
-
-==============================================================================
-API                                                        *preview.nvim-api*
-
-preview.compile({bufnr?})                                *preview.compile()*
-    Compile the document in the given buffer (default: current).
-
-preview.stop({bufnr?})                                      *preview.stop()*
-    Kill the active compilation process for the buffer.
-
-preview.clean({bufnr?})                                    *preview.clean()*
-    Run the provider's clean command for the buffer.
-
-preview.toggle({bufnr?})                                  *preview.toggle()*
-    Toggle auto-compile for the buffer. When enabled, the buffer is
-    immediately compiled and automatically recompiled on each save
-    (`BufWritePost`). Call again to stop.
-
-preview.open({bufnr?})                                      *preview.open()*
-    Open the last compiled output for the buffer without recompiling.
-
-preview.status({bufnr?})                                  *preview.status()*
-    Returns a |preview.Status| table.
-
-preview.statusline({bufnr?})                          *preview.statusline()*
-    Returns a short status string for statusline integration:
-    `'compiling'`, `'watching'`, or `''` (idle).
-
-                                                          *preview.Status*
-Status fields:~
-
-  `compiling`    boolean    Whether compilation is active.
-  `watching`     boolean    Whether auto-compile is active.
-  `provider`     string?    Name of the active provider.
-  `output_file`  string?    Path to the output file.
-
-preview.get_config()                                  *preview.get_config()*
-    Returns the resolved |preview.Config|.
-
-==============================================================================
-EVENTS                                                  *preview.nvim-events*
-
-preview.nvim fires User autocmds with structured data:
-
-`PreviewCompileStarted`  Compilation began.
-                        data: `{ bufnr, provider }`
-
-`PreviewCompileSuccess`  Compilation succeeded (exit code 0).
-                        data: `{ bufnr, provider, output }`
-
-`PreviewCompileFailed`   Compilation failed (non-zero exit).
-                        data: `{ bufnr, provider, code, stderr }`
-
-Example:~
->lua
-    vim.api.nvim_create_autocmd('User', {
-      pattern = 'PreviewCompileSuccess',
-      callback = function(args)
-        local data = args.data
-        vim.notify('Compiled ' .. data.output .. ' with ' .. data.provider)
-      end,
-    })
-<
-
-==============================================================================
-HEALTH                                                  *preview.nvim-health*
-
-Run `:checkhealth preview` to verify:
-
-- Neovim version >= 0.11.0
-- Each configured provider's binary is executable
-- Each configured provider's opener binary (if any) is executable
-- Each configured provider's filetype mapping is valid
-
-==============================================================================
- vim:tw=78:ts=8:ft=help:norl:

doc/preview.txt

@@ -0,0 +1,276 @@
+*preview.txt*                    Async document compilation for Neovim
+
+Author:  Barrett Ruth <br.barrettruth@gmail.com>
+License: MIT
+
+==============================================================================
+INTRODUCTION                                                    *preview.nvim*
+
+preview.nvim is an extensible framework for compiling documents asynchronously
+in Neovim. It provides a unified interface for any compilation workflow —
+LaTeX, Typst, Markdown, or anything else with a CLI compiler.
+
+The plugin ships with opt-in presets for common tools (Typst, LaTeX, Pandoc,
+AsciiDoc, PlantUML, Mermaid, Quarto) and supports fully custom providers.
+See |preview-presets|.
+
+==============================================================================
+CONTENTS                                                   *preview-contents*
+
+  1. Introduction ............................................. |preview.nvim|
+  2. Requirements ..................................... |preview-requirements|
+  3. Install ............................................... |preview-install|
+  4. Configuration ........................................... |preview-config|
+  5. Presets ............................................... |preview-presets|
+  6. Commands ............................................. |preview-commands|
+  7. Lua API ................................................... |preview-api|
+  8. Events ............................................... |preview-events|
+  9. Health ............................................... |preview-health|
+
+==============================================================================
+REQUIREMENTS                                           *preview-requirements*
+
+- Neovim >= 0.11.0
+- A compiler binary for each configured provider (e.g. `typst`, `latexmk`)
+
+==============================================================================
+INSTALL                                                      *preview-install*
+
+Install with lazy.nvim: >lua
+    { 'barrettruth/preview.nvim' }
+<
+
+No `setup()` call is needed. The plugin loads automatically when
+|vim.g.preview| is set. See |preview-config|.
+
+==============================================================================
+CONFIGURATION                                                *preview-config*
+
+Configure by setting |vim.g.preview| to a table where keys are preset names
+or filetypes. For each key `k` with value `v` (excluding `debug`):
+
+  - If `k` is a preset name and `v` is `true`, the preset is registered
+    as-is under its filetype.
+  - If `k` is a preset name and `v` is a table, it is deep-merged with
+    the preset and registered under the preset's filetype.
+  - If `k` is not a preset name and `v` is a table, it is registered
+    directly as a custom provider keyed by filetype `k`.
+  - If `v` is `false`, the entry is skipped (no-op).
+
+See |preview-presets| for available preset names.
+
+                                                    *preview.ProviderConfig*
+Provider fields: ~
+
+  {cmd}              (string[])         Compiler command (required).
+
+  {args}             (string[]|function) Additional arguments. If a function,
+                                        receives a |preview.Context| and
+                                        returns a string[].
+
+  {cwd}              (string|function)  Working directory. If a function,
+                                        receives a |preview.Context|.
+                                        Default: git root or file directory.
+
+  {env}              (table)            Environment variables.
+
+  {output}           (string|function)  Output file path. If a function,
+                                        receives a |preview.Context|.
+
+  {error_parser}     (function)         Receives (output, |preview.Context|)
+                                        and returns vim.Diagnostic[].
+
+  {errors}           (false|'diagnostic'|'quickfix')
+                                        How parse errors are reported.
+                                        `false` suppresses error handling.
+                                        `'quickfix'` populates the quickfix
+                                        list and opens it.
+                                        Default: `'diagnostic'`.
+
+  {clean}            (string[]|function) Command to remove build artifacts.
+                                        If a function, receives a
+                                        |preview.Context|.
+
+  {open}             (boolean|string[]) Open the output file after the first
+                                        successful compilation in toggle/watch
+                                        mode. `true` uses |vim.ui.open()|. A
+                                        string[] is run as a command with the
+                                        output path appended. When a string[]
+                                        is used the viewer process is tracked
+                                        and sent SIGTERM when the buffer is
+                                        deleted. `true` and single-instance
+                                        apps (e.g. Chrome) do not support
+                                        auto-close.
+
+  {reload}           (boolean|string[]|function)
+                                        Reload the output after recompilation.
+                                        `true` uses a built-in SSE server for
+                                        HTML files. A string[] is run as a
+                                        command. If a function, receives a
+                                        |preview.Context| and returns a
+                                        string[].
+
+  {detach}           (boolean)          When `true`, the viewer process opened
+                                        via a string[] `open` command is not
+                                        sent SIGTERM when the buffer is
+                                        deleted. Has no effect when `open` is
+                                        `true`. Default: `false`.
+
+                                                        *preview.Context*
+Context fields: ~
+
+  {bufnr}   (integer)   Buffer number.
+  {file}    (string)    Absolute file path.
+  {root}    (string)    Project root (git root or file directory).
+  {ft}      (string)    Filetype.
+  {output}  (string?)   Resolved output file path (set after `output`
+                        is evaluated, available to `args` functions).
+
+Global options: ~
+
+  {debug}   (boolean|string) Enable debug logging. A string value is treated
+                             as a log file path. Default: `false`.
+
+Example enabling presets: >lua
+    vim.g.preview = { typst = true, latex = true, github = true }
+<
+
+Example overriding a preset field: >lua
+    vim.g.preview = {
+      typst = { open = { 'sioyek', '--new-instance' } },
+    }
+<
+
+Example overriding the output path (e.g. latexmk `$out_dir`): >lua
+    vim.g.preview = {
+      latex = {
+        output = function(ctx)
+          return 'build/' .. vim.fn.fnamemodify(ctx.file, ':t:r') .. '.pdf'
+        end,
+      },
+    }
+<
+
+Example with a fully custom provider (key is not a preset name): >lua
+    vim.g.preview = {
+      rst = {
+        cmd = { 'rst2html' },
+        args = function(ctx)
+          return { ctx.file }
+        end,
+        output = function(ctx)
+          return ctx.file:gsub('%.rst$', '.html')
+        end,
+      },
+    }
+<
+
+==============================================================================
+PRESETS                                                    *preview-presets*
+
+Built-in provider configurations. Enable with `preset_name = true` or
+override individual fields by passing a table instead: >lua
+    vim.g.preview = { typst = true, latex = true, github = true }
+<
+
+  `typst`              typst compile → PDF
+  `latex`              latexmk -pdf → PDF (with clean support)
+  `pdflatex`           pdflatex → PDF (single pass, no latexmk)
+  `tectonic`           tectonic → PDF (Rust-based LaTeX engine)
+  `markdown`           pandoc → HTML (standalone, embedded)
+  `github`             pandoc → HTML (GitHub-styled, `-f gfm` input)
+  `asciidoctor`        asciidoctor → HTML (AsciiDoc with SSE reload)
+  `plantuml`           plantuml → SVG (UML diagrams, `.puml`)
+  `mermaid`            mmdc → SVG (Mermaid diagrams, `.mmd`)
+  `quarto`             quarto render → HTML (scientific publishing)
+
+==============================================================================
+COMMANDS                                                  *preview-commands*
+
+:Preview [subcommand]                                             *:Preview*
+
+    Subcommands: ~
+
+    `toggle`     Toggle auto-compile on save (default if omitted).
+    `compile`    One-shot compile of the current buffer.
+    `clean`      Run the provider's clean command.
+    `open`       Open the last compiled output without recompiling.
+    `status`     Echo compilation status (idle, compiling, watching).
+
+==============================================================================
+LUA API                                                        *preview-api*
+
+preview.toggle({bufnr?})                                  *preview.toggle()*
+    Toggle auto-compile for the buffer. When enabled, the buffer is
+    immediately compiled and automatically recompiled on each save
+    (`BufWritePost`). Call again to stop.
+
+preview.compile({bufnr?})                                *preview.compile()*
+    One-shot compile the document in the given buffer (default: current).
+
+preview.stop({bufnr?})                                      *preview.stop()*
+    Kill the active compilation process for the buffer. Programmatic
+    escape hatch — not exposed as a subcommand.
+
+preview.clean({bufnr?})                                    *preview.clean()*
+    Run the provider's clean command for the buffer.
+
+preview.open({bufnr?})                                      *preview.open()*
+    Open the last compiled output for the buffer without recompiling.
+
+preview.status({bufnr?})                                  *preview.status()*
+    Returns a |preview.Status| table.
+
+preview.statusline({bufnr?})                          *preview.statusline()*
+    Returns a short status string for statusline integration:
+    `'compiling'`, `'watching'`, or `''` (idle).
+
+preview.get_config()                                  *preview.get_config()*
+    Returns the resolved |preview.Config|.
+
+                                                          *preview.Status*
+Status fields: ~
+
+  {compiling}    (boolean)   Whether compilation is active.
+  {watching}     (boolean)   Whether auto-compile is active.
+  {provider}     (string?)   Name of the active provider.
+  {output_file}  (string?)   Path to the output file.
+
+==============================================================================
+EVENTS                                                      *preview-events*
+
+preview.nvim fires User autocmds with structured data:
+
+`PreviewCompileStarted`  Compilation began.
+                        data: `{ bufnr, provider }`
+
+`PreviewCompileSuccess`  Compilation succeeded (exit code 0).
+                        data: `{ bufnr, provider, output }`
+
+`PreviewCompileFailed`   Compilation failed (non-zero exit).
+                        data: `{ bufnr, provider, code, stderr }`
+
+Example: >lua
+    vim.api.nvim_create_autocmd('User', {
+      pattern = 'PreviewCompileSuccess',
+      callback = function(args)
+        local data = args.data
+        vim.notify('Compiled ' .. data.output .. ' with ' .. data.provider)
+      end,
+    })
+<
+
+==============================================================================
+HEALTH                                                      *preview-health*
+
+Run |:checkhealth| preview to verify your setup: >vim
+    :checkhealth preview
+<
+
+Checks: ~
+- Neovim version >= 0.11.0
+- Each configured provider's binary is executable
+- Each configured provider's opener binary (if any) is executable
+
+==============================================================================
+ vim:tw=78:ts=8:ft=help:norl:

flake.nix

@@ -13,12 +13,15 @@
       ...
     }:
     let
-      forEachSystem = f: nixpkgs.lib.genAttrs (import systems) (system: f nixpkgs.legacyPackages.${system});
+      forEachSystem =
+        f: nixpkgs.lib.genAttrs (import systems) (system: f nixpkgs.legacyPackages.${system});
     in
     {
-      devShells = forEachSystem (pkgs: {
+      formatter = forEachSystem (pkgs: pkgs.nixfmt-tree);
-        default = pkgs.mkShell {
+
-          packages = [
+      devShells = forEachSystem (pkgs:
+        let
+          devTools = [
             (pkgs.luajit.withPackages (
               ps: with ps; [
                 busted
@@ -30,7 +33,23 @@
             pkgs.selene
             pkgs.lua-language-server
           ];
-        };
+        in
-      });
+        {
+          default = pkgs.mkShell {
+            packages = devTools;
+          };
+          presets = pkgs.mkShell {
+            packages = devTools ++ [
+              pkgs.typst
+              pkgs.texliveMedium
+              pkgs.tectonic
+              pkgs.pandoc
+              pkgs.asciidoctor
+              pkgs.quarto
+              pkgs.plantuml
+              pkgs.mermaid-cli
+            ];
+          };
+        });
     };
 }

lua/preview/commands.lua

@@ -1,17 +1,14 @@
 local M = {}
 
 local handlers = {
-  build = function()
+  compile = function()
-    require('preview').build()
+    require('preview').compile()
-  end,
-  stop = function()
-    require('preview').stop()
   end,
   clean = function()
     require('preview').clean()
   end,
-  watch = function()
+  toggle = function()
-    require('preview').watch()
+    require('preview').toggle()
   end,
   open = function()
     require('preview').open()
@@ -33,7 +30,7 @@ local handlers = {
 
 ---@param args string
 local function dispatch(args)
-  local subcmd = args ~= '' and args or 'build'
+  local subcmd = args ~= '' and args or 'toggle'
   local handler = handlers[subcmd]
   if handler then
     handler()
@@ -58,7 +55,13 @@ function M.setup()
     complete = function(lead)
       return complete(lead)
     end,
-    desc = 'Build, stop, clean, watch, open, or check status of document preview',
+    desc = 'Toggle, compile, clean, open, or check status of document preview',
+  })
+
+  vim.api.nvim_create_autocmd('VimLeavePre', {
+    callback = function()
+      require('preview.compiler').stop_all()
+    end,
   })
 end
 

lua/preview/compiler.lua

@@ -15,10 +15,49 @@ local opened = {}
 ---@type table<integer, string>
 local last_output = {}
 
+---@type table<integer, table>
+local viewer_procs = {}
+
+---@type table<integer, uv.uv_fs_event_t>
+local open_watchers = {}
+
 local debounce_timers = {}
 
 local DEBOUNCE_MS = 500
 
+---@param bufnr integer
+local function stop_open_watcher(bufnr)
+  local w = open_watchers[bufnr]
+  if w then
+    w:stop()
+    w:close()
+    open_watchers[bufnr] = nil
+  end
+end
+
+---@param bufnr integer
+local function close_viewer(bufnr)
+  local obj = viewer_procs[bufnr]
+  if obj then
+    local kill = obj.kill
+    kill(obj, 'sigterm')
+    viewer_procs[bufnr] = nil
+  end
+end
+
+---@param bufnr integer
+---@param output_file string
+---@param open_config boolean|string[]
+local function do_open(bufnr, output_file, open_config)
+  if open_config == true then
+    vim.ui.open(output_file)
+  elseif type(open_config) == 'table' then
+    local open_cmd = vim.list_extend({}, open_config)
+    table.insert(open_cmd, output_file)
+    viewer_procs[bufnr] = vim.system(open_cmd)
+  end
+end
+
 ---@param val string[]|fun(ctx: preview.Context): string[]
 ---@param ctx preview.Context
 ---@return string[]
@@ -55,7 +94,17 @@ end
 ---@param name string
 ---@param provider preview.ProviderConfig
 ---@param ctx preview.Context
-function M.compile(bufnr, name, provider, ctx)
+function M.compile(bufnr, name, provider, ctx, opts)
+  opts = opts or {}
+
+  if vim.fn.executable(provider.cmd[1]) ~= 1 then
+    vim.notify(
+      '[preview.nvim]: "' .. provider.cmd[1] .. '" is not executable (run :checkhealth preview)',
+      vim.log.levels.ERROR
+    )
+    return
+  end
+
   if vim.bo[bufnr].modified then
     vim.cmd('silent! update')
   end
@@ -81,7 +130,10 @@ function M.compile(bufnr, name, provider, ctx)
     last_output[bufnr] = output_file
   end
 
-  local reload_cmd = resolve_reload_cmd(provider, resolved_ctx)
+  local reload_cmd
+  if not opts.oneshot then
+    reload_cmd = resolve_reload_cmd(provider, resolved_ctx)
+  end
 
   if reload_cmd then
     log.dbg(
@@ -91,14 +143,52 @@ function M.compile(bufnr, name, provider, ctx)
       table.concat(reload_cmd, ' ')
     )
 
-    local obj = vim.system(
+    local stderr_acc = {}
+    local obj
+    obj = vim.system(
       reload_cmd,
       {
         cwd = cwd,
         env = provider.env,
+        stderr = vim.schedule_wrap(function(_err, data)
+          if not data or not vim.api.nvim_buf_is_valid(bufnr) then
+            return
+          end
+          stderr_acc[#stderr_acc + 1] = data
+          local errors_mode = provider.errors
+          if errors_mode == nil then
+            errors_mode = 'diagnostic'
+          end
+          if provider.error_parser and errors_mode then
+            local output = table.concat(stderr_acc)
+            if errors_mode == 'diagnostic' then
+              diagnostic.set(bufnr, name, provider.error_parser, output, ctx)
+            elseif errors_mode == 'quickfix' then
+              local ok, diags = pcall(provider.error_parser, output, ctx)
+              if ok and diags and #diags > 0 then
+                local items = {}
+                for _, d in ipairs(diags) do
+                  table.insert(items, {
+                    bufnr = bufnr,
+                    lnum = d.lnum + 1,
+                    col = d.col + 1,
+                    text = d.message,
+                    type = d.severity == vim.diagnostic.severity.WARN and 'W' or 'E',
+                  })
+                end
+                vim.fn.setqflist(items, 'r')
+                local win = vim.fn.win_getid()
+                vim.cmd.cwindow()
+                vim.fn.win_gotoid(win)
+              end
+            end
+          end
+        end),
       },
       vim.schedule_wrap(function(result)
-        active[bufnr] = nil
+        if active[bufnr] and active[bufnr].obj == obj then
+          active[bufnr] = nil
+        end
         if not vim.api.nvim_buf_is_valid(bufnr) then
           return
         end
@@ -127,7 +217,9 @@ function M.compile(bufnr, name, provider, ctx)
                   })
                 end
                 vim.fn.setqflist(items, 'r')
-                vim.cmd('copen')
+                local win = vim.fn.win_getid()
+                vim.cmd.cwindow()
+                vim.fn.win_gotoid(win)
               end
             end
           end
@@ -144,24 +236,64 @@ function M.compile(bufnr, name, provider, ctx)
       end)
     )
 
-    if provider.open and not opened[bufnr] and output_file ~= '' then
+    if provider.open and not opts.oneshot and not opened[bufnr] and output_file ~= '' then
-      if provider.open == true then
+      local pre_stat = vim.uv.fs_stat(output_file)
-        vim.ui.open(output_file)
+      local pre_mtime = pre_stat and pre_stat.mtime.sec or 0
-      elseif type(provider.open) == 'table' then
+      local out_dir = vim.fn.fnamemodify(output_file, ':h')
-        local open_cmd = vim.list_extend({}, provider.open)
+      local out_name = vim.fn.fnamemodify(output_file, ':t')
-        table.insert(open_cmd, output_file)
+      stop_open_watcher(bufnr)
-        vim.system(open_cmd)
+      local watcher = vim.uv.new_fs_event()
+      if watcher then
+        open_watchers[bufnr] = watcher
+        watcher:start(
+          out_dir,
+          {},
+          vim.schedule_wrap(function(err, filename, _events)
+            if err or vim.fn.fnamemodify(filename or '', ':t') ~= out_name then
+              return
+            end
+            if opened[bufnr] then
+              stop_open_watcher(bufnr)
+              return
+            end
+            if not vim.api.nvim_buf_is_valid(bufnr) then
+              stop_open_watcher(bufnr)
+              return
+            end
+            local new_stat = vim.uv.fs_stat(output_file)
+            if not (new_stat and new_stat.mtime.sec > pre_mtime) then
+              return
+            end
+            stop_open_watcher(bufnr)
+            stderr_acc = {}
+            local errors_mode = provider.errors
+            if errors_mode == nil then
+              errors_mode = 'diagnostic'
+            end
+            if errors_mode == 'diagnostic' then
+              diagnostic.clear(bufnr)
+            elseif errors_mode == 'quickfix' then
+              vim.fn.setqflist({}, 'r')
+              vim.cmd.cwindow()
+            end
+            do_open(bufnr, output_file, provider.open)
+            opened[bufnr] = true
+          end)
+        )
       end
-      opened[bufnr] = true
     end
 
     active[bufnr] = { obj = obj, provider = name, output_file = output_file, is_reload = true }
 
-    vim.api.nvim_create_autocmd('BufWipeout', {
+    vim.api.nvim_create_autocmd('BufUnload', {
       buffer = bufnr,
       once = true,
       callback = function()
         M.stop(bufnr)
+        stop_open_watcher(bufnr)
+        if not provider.detach then
+          close_viewer(bufnr)
+        end
         last_output[bufnr] = nil
       end,
     })
@@ -180,14 +312,17 @@ function M.compile(bufnr, name, provider, ctx)
 
   log.dbg('compiling buffer %d with provider "%s": %s', bufnr, name, table.concat(cmd, ' '))
 
-  local obj = vim.system(
+  local obj
+  obj = vim.system(
     cmd,
     {
       cwd = cwd,
       env = provider.env,
     },
     vim.schedule_wrap(function(result)
-      active[bufnr] = nil
+      if active[bufnr] and active[bufnr].obj == obj then
+        active[bufnr] = nil
+      end
       if not vim.api.nvim_buf_is_valid(bufnr) then
         return
       end
@@ -203,6 +338,7 @@ function M.compile(bufnr, name, provider, ctx)
           diagnostic.clear(bufnr)
         elseif errors_mode == 'quickfix' then
           vim.fn.setqflist({}, 'r')
+          vim.cmd.cwindow()
         end
         vim.api.nvim_exec_autocmds('User', {
           pattern = 'PreviewCompileSuccess',
@@ -214,14 +350,14 @@ function M.compile(bufnr, name, provider, ctx)
           r.inject(output_file)
           r.broadcast()
         end
-        if provider.open and not opened[bufnr] and output_file ~= '' then
+        if
-          if provider.open == true then
+          provider.open
-            vim.ui.open(output_file)
+          and not opts.oneshot
-          elseif type(provider.open) == 'table' then
+          and not opened[bufnr]
-            local open_cmd = vim.list_extend({}, provider.open)
+          and output_file ~= ''
-            table.insert(open_cmd, output_file)
+          and vim.uv.fs_stat(output_file)
-            vim.system(open_cmd)
+        then
-          end
+          do_open(bufnr, output_file, provider.open)
           opened[bufnr] = true
         end
       else
@@ -244,7 +380,9 @@ function M.compile(bufnr, name, provider, ctx)
                 })
               end
               vim.fn.setqflist(items, 'r')
-              vim.cmd('copen')
+              local win = vim.fn.win_getid()
+              vim.cmd.cwindow()
+              vim.fn.win_gotoid(win)
             end
           end
         end
@@ -263,11 +401,14 @@ function M.compile(bufnr, name, provider, ctx)
 
   active[bufnr] = { obj = obj, provider = name, output_file = output_file }
 
-  vim.api.nvim_create_autocmd('BufWipeout', {
+  vim.api.nvim_create_autocmd('BufUnload', {
     buffer = bufnr,
     once = true,
     callback = function()
       M.stop(bufnr)
+      if not provider.detach then
+        close_viewer(bufnr)
+      end
       last_output[bufnr] = nil
     end,
   })
@@ -308,6 +449,12 @@ function M.stop_all()
   for bufnr, _ in pairs(watching) do
     M.unwatch(bufnr)
   end
+  for bufnr, _ in pairs(open_watchers) do
+    stop_open_watcher(bufnr)
+  end
+  for bufnr, _ in pairs(viewer_procs) do
+    close_viewer(bufnr)
+  end
   require('preview.reload').stop()
 end
 
@@ -358,11 +505,15 @@ function M.toggle(bufnr, name, provider, ctx_builder)
   log.dbg('watching buffer %d with provider "%s"', bufnr, name)
   vim.notify('[preview.nvim]: watching with "' .. name .. '"', vim.log.levels.INFO)
 
-  vim.api.nvim_create_autocmd('BufWipeout', {
+  vim.api.nvim_create_autocmd('BufUnload', {
     buffer = bufnr,
     once = true,
     callback = function()
       M.unwatch(bufnr)
+      stop_open_watcher(bufnr)
+      if not provider.detach then
+        close_viewer(bufnr)
+      end
       opened[bufnr] = nil
     end,
   })
@@ -392,14 +543,23 @@ end
 ---@param ctx preview.Context
 function M.clean(bufnr, name, provider, ctx)
   if not provider.clean then
-    vim.notify('[preview.nvim] provider "' .. name .. '" has no clean command', vim.log.levels.WARN)
+    vim.notify(
+      '[preview.nvim]: provider "' .. name .. '" has no clean command',
+      vim.log.levels.WARN
+    )
     return
   end
 
-  local cmd = eval_list(provider.clean, ctx)
+  local output_file = ''
-  local cwd = ctx.root
+  if provider.output then
+    output_file = eval_string(provider.output, ctx)
+  end
+  local resolved_ctx = vim.tbl_extend('force', ctx, { output = output_file })
+
+  local cmd = eval_list(provider.clean, resolved_ctx)
+  local cwd = resolved_ctx.root
   if provider.cwd then
-    cwd = eval_string(provider.cwd, ctx)
+    cwd = eval_string(provider.cwd, resolved_ctx)
   end
 
   log.dbg('cleaning buffer %d with provider "%s": %s', bufnr, name, table.concat(cmd, ' '))
@@ -410,10 +570,10 @@ function M.clean(bufnr, name, provider, ctx)
     vim.schedule_wrap(function(result)
       if result.code == 0 then
         log.dbg('clean succeeded for buffer %d', bufnr)
-        vim.notify('[preview.nvim] clean complete', vim.log.levels.INFO)
+        vim.notify('[preview.nvim]: clean complete', vim.log.levels.INFO)
       else
         log.dbg('clean failed for buffer %d (exit code %d)', bufnr, result.code)
-        vim.notify('[preview.nvim] clean failed: ' .. (result.stderr or ''), vim.log.levels.ERROR)
+        vim.notify('[preview.nvim]: clean failed: ' .. (result.stderr or ''), vim.log.levels.ERROR)
       end
     end)
   )
@@ -421,13 +581,17 @@ end
 
 ---@param bufnr integer
 ---@return boolean
-function M.open(bufnr)
+function M.open(bufnr, open_config)
   local output = last_output[bufnr]
   if not output then
     log.dbg('no last output file for buffer %d', bufnr)
     return false
   end
-  vim.ui.open(output)
+  if not vim.uv.fs_stat(output) then
+    log.dbg('output file no longer exists for buffer %d: %s', bufnr, output)
+    return false
+  end
+  do_open(bufnr, output, open_config)
   return true
 end
 
@@ -452,6 +616,8 @@ M._test = {
   opened = opened,
   last_output = last_output,
   debounce_timers = debounce_timers,
+  viewer_procs = viewer_procs,
+  open_watchers = open_watchers,
 }
 
 return M

lua/preview/init.lua

@@ -10,6 +10,7 @@
 ---@field clean? string[]|fun(ctx: preview.Context): string[]
 ---@field open? boolean|string[]
 ---@field reload? boolean|string[]|fun(ctx: preview.Context): string[]
+---@field detach? boolean
 
 ---@class preview.Config
 ---@field debug boolean|string
@@ -39,10 +40,10 @@
 
 ---@class preview
 ---@field setup fun(opts?: table)
----@field build fun(bufnr?: integer)
+---@field compile fun(bufnr?: integer)
 ---@field stop fun(bufnr?: integer)
 ---@field clean fun(bufnr?: integer)
----@field watch fun(bufnr?: integer)
+---@field toggle fun(bufnr?: integer)
 ---@field open fun(bufnr?: integer)
 ---@field status fun(bufnr?: integer): preview.Status
 ---@field statusline fun(bufnr?: integer): string
@@ -101,6 +102,13 @@ function M.setup(opts)
     end, 'false, "diagnostic", or "quickfix"')
     vim.validate(prefix .. '.open', provider.open, { 'boolean', 'table' }, true)
     vim.validate(prefix .. '.reload', provider.reload, { 'boolean', 'table', 'function' }, true)
+    vim.validate(prefix .. '.detach', provider.detach, 'boolean', true)
+  end
+
+  if providers['plantuml'] then
+    vim.filetype.add({
+      extension = { puml = 'plantuml', pu = 'plantuml' },
+    })
   end
 
   config = vim.tbl_deep_extend('force', default_config, {
@@ -144,16 +152,20 @@ function M.build_context(bufnr)
 end
 
 ---@param bufnr? integer
-function M.build(bufnr)
+function M.compile(bufnr)
   bufnr = bufnr or vim.api.nvim_get_current_buf()
+  if vim.api.nvim_buf_get_name(bufnr) == '' then
+    vim.notify('[preview.nvim]: buffer has no file name', vim.log.levels.WARN)
+    return
+  end
   local name = M.resolve_provider(bufnr)
   if not name then
-    vim.notify('[preview.nvim] no provider configured for this filetype', vim.log.levels.WARN)
+    vim.notify('[preview.nvim]: no provider configured for this filetype', vim.log.levels.WARN)
     return
   end
   local ctx = M.build_context(bufnr)
   local provider = config.providers[name]
-  compiler.compile(bufnr, name, provider, ctx)
+  compiler.compile(bufnr, name, provider, ctx, { oneshot = true })
 end
 
 ---@param bufnr? integer
@@ -165,9 +177,13 @@ end
 ---@param bufnr? integer
 function M.clean(bufnr)
   bufnr = bufnr or vim.api.nvim_get_current_buf()
+  if vim.api.nvim_buf_get_name(bufnr) == '' then
+    vim.notify('[preview.nvim]: buffer has no file name', vim.log.levels.WARN)
+    return
+  end
   local name = M.resolve_provider(bufnr)
   if not name then
-    vim.notify('[preview.nvim] no provider configured for this filetype', vim.log.levels.WARN)
+    vim.notify('[preview.nvim]: no provider configured for this filetype', vim.log.levels.WARN)
     return
   end
   local ctx = M.build_context(bufnr)
@@ -176,11 +192,15 @@ function M.clean(bufnr)
 end
 
 ---@param bufnr? integer
-function M.watch(bufnr)
+function M.toggle(bufnr)
   bufnr = bufnr or vim.api.nvim_get_current_buf()
+  if vim.api.nvim_buf_get_name(bufnr) == '' then
+    vim.notify('[preview.nvim]: buffer has no file name', vim.log.levels.WARN)
+    return
+  end
   local name = M.resolve_provider(bufnr)
   if not name then
-    vim.notify('[preview.nvim] no provider configured for this filetype', vim.log.levels.WARN)
+    vim.notify('[preview.nvim]: no provider configured for this filetype', vim.log.levels.WARN)
     return
   end
   local provider = config.providers[name]
@@ -190,8 +210,14 @@ end
 ---@param bufnr? integer
 function M.open(bufnr)
   bufnr = bufnr or vim.api.nvim_get_current_buf()
-  if not compiler.open(bufnr) then
+  if vim.api.nvim_buf_get_name(bufnr) == '' then
-    vim.notify('[preview.nvim] no output file available for this buffer', vim.log.levels.WARN)
+    vim.notify('[preview.nvim]: buffer has no file name', vim.log.levels.WARN)
+    return
+  end
+  local name = M.resolve_provider(bufnr)
+  local open_config = name and config.providers[name] and config.providers[name].open
+  if not compiler.open(bufnr, open_config) then
+    vim.notify('[preview.nvim]: no output file available for this buffer', vim.log.levels.WARN)
   end
 end
 
@@ -228,4 +254,8 @@ M._test = {
   end,
 }
 
+if vim.g.preview then
+  M.setup(vim.g.preview)
+end
+
 return M

lua/preview/presets.lua

@@ -93,6 +93,28 @@ local function parse_pandoc(output)
   return diagnostics
 end
 
+---@param output string
+---@return preview.Diagnostic[]
+local function parse_asciidoctor(output)
+  local diagnostics = {}
+  for line in output:gmatch('[^\r\n]+') do
+    local severity, _, lnum, msg = line:match('^asciidoctor: (%u+): (.+): line (%d+): (.+)$')
+    if lnum then
+      local sev = vim.diagnostic.severity.ERROR
+      if severity == 'WARNING' then
+        sev = vim.diagnostic.severity.WARN
+      end
+      table.insert(diagnostics, {
+        lnum = tonumber(lnum) - 1,
+        col = 0,
+        message = msg,
+        severity = sev,
+      })
+    end
+  end
+  return diagnostics
+end
+
 ---@type preview.ProviderConfig
 M.typst = {
   ft = 'typst',
@@ -106,9 +128,12 @@ M.typst = {
   error_parser = function(output)
     return parse_typst(output)
   end,
+  clean = function(ctx)
+    return { 'rm', '-f', (ctx.file:gsub('%.typ$', '.pdf')) }
+  end,
   open = true,
   reload = function(ctx)
-    return { 'typst', 'watch', ctx.file }
+    return { 'typst', 'watch', '--diagnostic-format', 'short', ctx.file }
   end,
 }
 
@@ -137,6 +162,45 @@ M.latex = {
   open = true,
 }
 
+---@type preview.ProviderConfig
+M.pdflatex = {
+  ft = 'tex',
+  cmd = { 'pdflatex' },
+  args = function(ctx)
+    return { '-interaction=nonstopmode', '-file-line-error', '-synctex=1', ctx.file }
+  end,
+  output = function(ctx)
+    return (ctx.file:gsub('%.tex$', '.pdf'))
+  end,
+  error_parser = function(output)
+    return parse_latexmk(output)
+  end,
+  clean = function(ctx)
+    local base = ctx.file:gsub('%.tex$', '')
+    return { 'rm', '-f', base .. '.pdf', base .. '.aux', base .. '.log', base .. '.synctex.gz' }
+  end,
+  open = true,
+}
+
+---@type preview.ProviderConfig
+M.tectonic = {
+  ft = 'tex',
+  cmd = { 'tectonic' },
+  args = function(ctx)
+    return { ctx.file }
+  end,
+  output = function(ctx)
+    return (ctx.file:gsub('%.tex$', '.pdf'))
+  end,
+  error_parser = function(output)
+    return parse_latexmk(output)
+  end,
+  clean = function(ctx)
+    return { 'rm', '-f', (ctx.file:gsub('%.tex$', '.pdf')) }
+  end,
+  open = true,
+}
+
 ---@type preview.ProviderConfig
 M.markdown = {
   ft = 'markdown',
@@ -187,4 +251,104 @@ M.github = {
   reload = true,
 }
 
+---@type preview.ProviderConfig
+M.asciidoctor = {
+  ft = 'asciidoc',
+  cmd = { 'asciidoctor' },
+  args = function(ctx)
+    return { '--failure-level', 'ERROR', ctx.file, '-o', ctx.output }
+  end,
+  output = function(ctx)
+    return (ctx.file:gsub('%.adoc$', '.html'))
+  end,
+  error_parser = function(output)
+    return parse_asciidoctor(output)
+  end,
+  clean = function(ctx)
+    return { 'rm', '-f', (ctx.file:gsub('%.adoc$', '.html')) }
+  end,
+  open = true,
+  reload = true,
+}
+
+---@type preview.ProviderConfig
+M.plantuml = {
+  ft = 'plantuml',
+  cmd = { 'plantuml' },
+  args = function(ctx)
+    return { '-tsvg', ctx.file }
+  end,
+  output = function(ctx)
+    return (ctx.file:gsub('%.puml$', '.svg'))
+  end,
+  error_parser = function(output)
+    local diagnostics = {}
+    for line in output:gmatch('[^\r\n]+') do
+      local lnum = line:match('^Error line (%d+) in file:')
+      if lnum then
+        table.insert(diagnostics, {
+          lnum = tonumber(lnum) - 1,
+          col = 0,
+          message = line,
+          severity = vim.diagnostic.severity.ERROR,
+        })
+      end
+    end
+    return diagnostics
+  end,
+  clean = function(ctx)
+    return { 'rm', '-f', (ctx.file:gsub('%.puml$', '.svg')) }
+  end,
+  open = true,
+}
+
+---@type preview.ProviderConfig
+M.mermaid = {
+  ft = 'mermaid',
+  cmd = { 'mmdc' },
+  args = function(ctx)
+    return { '-i', ctx.file, '-o', ctx.output }
+  end,
+  output = function(ctx)
+    return (ctx.file:gsub('%.mmd$', '.svg'))
+  end,
+  error_parser = function(output)
+    local diagnostics = {}
+    for line in output:gmatch('[^\r\n]+') do
+      local lnum = line:match('^%s*Parse error on line (%d+)')
+      if lnum then
+        table.insert(diagnostics, {
+          lnum = tonumber(lnum) - 1,
+          col = 0,
+          message = line,
+          severity = vim.diagnostic.severity.ERROR,
+        })
+      end
+    end
+    return diagnostics
+  end,
+  clean = function(ctx)
+    return { 'rm', '-f', (ctx.file:gsub('%.mmd$', '.svg')) }
+  end,
+  open = true,
+}
+
+---@type preview.ProviderConfig
+M.quarto = {
+  ft = 'quarto',
+  cmd = { 'quarto' },
+  args = function(ctx)
+    return { 'render', ctx.file, '--to', 'html', '--embed-resources' }
+  end,
+  output = function(ctx)
+    return (ctx.file:gsub('%.qmd$', '.html'))
+  end,
+  clean = function(ctx)
+    local base = ctx.file:gsub('%.qmd$', '')
+    return { 'rm', '-rf', base .. '.html', base .. '_files' }
+  end,
+  open = true,
+  reload = true,
+}
+
 return M

lua/preview/reload.lua

@@ -2,6 +2,7 @@ local M = {}
 
 local PORT = 5554
 local server_handle = nil
+local actual_port = nil
 local clients = {}
 
 local function make_script(port)
@@ -14,12 +15,15 @@ local function make_script(port)
 end
 
 function M.start(port)
-  port = port or PORT
   if server_handle then
     return
   end
   local server = vim.uv.new_tcp()
-  server:bind('127.0.0.1', port)
+  server:bind('127.0.0.1', port or 0)
+  local sockname = server:getsockname()
+  if sockname then
+    actual_port = sockname.port
+  end
   server:listen(128, function(err)
     if err then
       return
@@ -66,6 +70,7 @@ function M.stop()
     server_handle:close()
     server_handle = nil
   end
+  actual_port = nil
 end
 
 function M.broadcast()
@@ -85,7 +90,7 @@ function M.broadcast()
 end
 
 function M.inject(path, port)
-  port = port or PORT
+  port = actual_port or port or PORT
   local f = io.open(path, 'r')
   if not f then
     return

scripts/ci.sh

@@ -0,0 +1,10 @@
+#!/bin/sh
+set -eu
+
+nix develop --command stylua --check .
+git ls-files '*.lua' | xargs nix develop --command selene --display-style quiet
+nix develop --command prettier --check .
+nix fmt
+git diff --exit-code -- '*.nix'
+nix develop --command lua-language-server --check lua/ --configpath "$(pwd)/.luarc.json" --checklevel=Warning
+nix develop --command busted

spec/commands_spec.lua

@@ -11,20 +11,26 @@ describe('commands', function()
       local cmds = vim.api.nvim_get_commands({})
       assert.is_not_nil(cmds.Preview)
     end)
+
+    it('registers VimLeavePre autocmd', function()
+      require('preview.commands').setup()
+      local aus = vim.api.nvim_get_autocmds({ event = 'VimLeavePre' })
+      local found = false
+      for _, au in ipairs(aus) do
+        if au.callback then
+          found = true
+          break
+        end
+      end
+      assert.is_true(found)
+    end)
   end)
 
   describe('dispatch', function()
-    it('does not error on :Preview with no provider', function()
+    it('does not error on :Preview compile with no provider', function()
       require('preview.commands').setup()
       assert.has_no.errors(function()
-        vim.cmd('Preview build')
+        vim.cmd('Preview compile')
-      end)
-    end)
-
-    it('does not error on :Preview stop', function()
-      require('preview.commands').setup()
-      assert.has_no.errors(function()
-        vim.cmd('Preview stop')
       end)
     end)
 
@@ -42,10 +48,10 @@ describe('commands', function()
       end)
     end)
 
-    it('does not error on :Preview watch with no provider', function()
+    it('does not error on :Preview toggle with no provider', function()
       require('preview.commands').setup()
       assert.has_no.errors(function()
-        vim.cmd('Preview watch')
+        vim.cmd('Preview toggle')
       end)
     end)
   end)

spec/compiler_spec.lua

@@ -99,6 +99,35 @@ describe('compiler', function()
       helpers.delete_buffer(bufnr)
     end)
 
+    it('notifies and returns when binary is not executable', function()
+      local bufnr = helpers.create_buffer({ 'hello' }, 'text')
+      vim.api.nvim_buf_set_name(bufnr, '/tmp/preview_test_nobin.txt')
+      vim.bo[bufnr].modified = false
+
+      local notified = false
+      local orig = vim.notify
+      vim.notify = function(msg)
+        if msg:find('not executable') then
+          notified = true
+        end
+      end
+
+      local provider = { cmd = { 'totally_nonexistent_binary_xyz_preview' } }
+      local ctx = {
+        bufnr = bufnr,
+        file = '/tmp/preview_test_nobin.txt',
+        root = '/tmp',
+        ft = 'text',
+      }
+
+      compiler.compile(bufnr, 'nobin', provider, ctx)
+      vim.notify = orig
+
+      assert.is_true(notified)
+      assert.is_nil(compiler._test.active[bufnr])
+      helpers.delete_buffer(bufnr)
+    end)
+
     it('fires PreviewCompileFailed on non-zero exit', function()
       local bufnr = helpers.create_buffer({ 'hello' }, 'text')
       vim.api.nvim_buf_set_name(bufnr, '/tmp/preview_test_fail.txt')

spec/init_spec.lua

@@ -108,4 +108,62 @@ describe('preview', function()
       helpers.delete_buffer(bufnr)
     end)
   end)
+
+  describe('unnamed buffer guard', function()
+    before_each(function()
+      helpers.reset_config({ typst = true })
+      preview = require('preview')
+    end)
+
+    local function capture_notify(fn)
+      local msg = nil
+      local orig = vim.notify
+      vim.notify = function(m)
+        msg = m
+      end
+      fn()
+      vim.notify = orig
+      return msg
+    end
+
+    it('compile warns on unnamed buffer', function()
+      local bufnr = helpers.create_buffer({}, 'typst')
+      local msg = capture_notify(function()
+        preview.compile(bufnr)
+      end)
+      assert.is_not_nil(msg)
+      assert.is_truthy(msg:find('no file name'))
+      helpers.delete_buffer(bufnr)
+    end)
+
+    it('toggle warns on unnamed buffer', function()
+      local bufnr = helpers.create_buffer({}, 'typst')
+      local msg = capture_notify(function()
+        preview.toggle(bufnr)
+      end)
+      assert.is_not_nil(msg)
+      assert.is_truthy(msg:find('no file name'))
+      helpers.delete_buffer(bufnr)
+    end)
+
+    it('clean warns on unnamed buffer', function()
+      local bufnr = helpers.create_buffer({}, 'typst')
+      local msg = capture_notify(function()
+        preview.clean(bufnr)
+      end)
+      assert.is_not_nil(msg)
+      assert.is_truthy(msg:find('no file name'))
+      helpers.delete_buffer(bufnr)
+    end)
+
+    it('open warns on unnamed buffer', function()
+      local bufnr = helpers.create_buffer({}, 'typst')
+      local msg = capture_notify(function()
+        preview.open(bufnr)
+      end)
+      assert.is_not_nil(msg)
+      assert.is_truthy(msg:find('no file name'))
+      helpers.delete_buffer(bufnr)
+    end)
+  end)
 end)

spec/presets_spec.lua

@@ -33,6 +33,10 @@ describe('presets', function()
       assert.are.equal('/tmp/document.pdf', output)
     end)
 
+    it('returns clean command', function()
+      assert.are.same({ 'rm', '-f', '/tmp/document.pdf' }, presets.typst.clean(ctx))
+    end)
+
     it('has open enabled', function()
       assert.is_true(presets.typst.open)
     end)
@@ -46,7 +50,9 @@ describe('presets', function()
       assert.is_table(result)
       assert.are.equal('typst', result[1])
       assert.are.equal('watch', result[2])
-      assert.are.equal(ctx.file, result[3])
+      assert.are.equal('--diagnostic-format', result[3])
+      assert.are.equal('short', result[4])
+      assert.are.equal(ctx.file, result[5])
     end)
 
     it('parses errors from stderr', function()
@@ -157,6 +163,120 @@ describe('presets', function()
     end)
   end)
 
+  describe('pdflatex', function()
+    local tex_ctx = {
+      bufnr = 1,
+      file = '/tmp/document.tex',
+      root = '/tmp',
+      ft = 'tex',
+    }
+
+    it('has ft', function()
+      assert.are.equal('tex', presets.pdflatex.ft)
+    end)
+
+    it('has cmd', function()
+      assert.are.same({ 'pdflatex' }, presets.pdflatex.cmd)
+    end)
+
+    it('returns args with flags and file path', function()
+      local args = presets.pdflatex.args(tex_ctx)
+      assert.are.same(
+        { '-interaction=nonstopmode', '-file-line-error', '-synctex=1', '/tmp/document.tex' },
+        args
+      )
+    end)
+
+    it('returns pdf output path', function()
+      assert.are.equal('/tmp/document.pdf', presets.pdflatex.output(tex_ctx))
+    end)
+
+    it('has open enabled', function()
+      assert.is_true(presets.pdflatex.open)
+    end)
+
+    it('returns clean command removing pdf and aux files', function()
+      local clean = presets.pdflatex.clean(tex_ctx)
+      assert.are.same({
+        'rm',
+        '-f',
+        '/tmp/document.pdf',
+        '/tmp/document.aux',
+        '/tmp/document.log',
+        '/tmp/document.synctex.gz',
+      }, clean)
+    end)
+
+    it('has no reload', function()
+      assert.is_nil(presets.pdflatex.reload)
+    end)
+
+    it('parses file-line-error format', function()
+      local output = './document.tex:10: Undefined control sequence.'
+      local diagnostics = presets.pdflatex.error_parser(output, tex_ctx)
+      assert.are.equal(1, #diagnostics)
+      assert.are.equal(9, diagnostics[1].lnum)
+      assert.are.equal(0, diagnostics[1].col)
+      assert.are.equal('Undefined control sequence.', diagnostics[1].message)
+      assert.are.equal(vim.diagnostic.severity.ERROR, diagnostics[1].severity)
+    end)
+
+    it('returns empty table for clean output', function()
+      assert.are.same({}, presets.pdflatex.error_parser('', tex_ctx))
+    end)
+  end)
+
+  describe('tectonic', function()
+    local tex_ctx = {
+      bufnr = 1,
+      file = '/tmp/document.tex',
+      root = '/tmp',
+      ft = 'tex',
+    }
+
+    it('has ft', function()
+      assert.are.equal('tex', presets.tectonic.ft)
+    end)
+
+    it('has cmd', function()
+      assert.are.same({ 'tectonic' }, presets.tectonic.cmd)
+    end)
+
+    it('returns args with file path', function()
+      assert.are.same({ '/tmp/document.tex' }, presets.tectonic.args(tex_ctx))
+    end)
+
+    it('returns pdf output path', function()
+      assert.are.equal('/tmp/document.pdf', presets.tectonic.output(tex_ctx))
+    end)
+
+    it('has open enabled', function()
+      assert.is_true(presets.tectonic.open)
+    end)
+
+    it('returns clean command removing pdf', function()
+      assert.are.same({ 'rm', '-f', '/tmp/document.pdf' }, presets.tectonic.clean(tex_ctx))
+    end)
+
+    it('has no reload', function()
+      assert.is_nil(presets.tectonic.reload)
+    end)
+
+    it('parses file-line-error format', function()
+      local output = './document.tex:5: Missing $ inserted.'
+      local diagnostics = presets.tectonic.error_parser(output, tex_ctx)
+      assert.are.equal(1, #diagnostics)
+      assert.are.equal(4, diagnostics[1].lnum)
+      assert.are.equal(0, diagnostics[1].col)
+      assert.are.equal('Missing $ inserted.', diagnostics[1].message)
+      assert.are.equal(vim.diagnostic.severity.ERROR, diagnostics[1].severity)
+    end)
+
+    it('returns empty table for clean output', function()
+      assert.are.same({}, presets.tectonic.error_parser('', tex_ctx))
+    end)
+  end)
+
   describe('markdown', function()
     local md_ctx = {
       bufnr = 1,
@@ -341,4 +461,116 @@ describe('presets', function()
       assert.are.same({}, diagnostics)
     end)
   end)
+
+  describe('asciidoctor', function()
+    local adoc_ctx = {
+      bufnr = 1,
+      file = '/tmp/document.adoc',
+      root = '/tmp',
+      ft = 'asciidoc',
+      output = '/tmp/document.html',
+    }
+
+    it('has ft', function()
+      assert.are.equal('asciidoc', presets.asciidoctor.ft)
+    end)
+
+    it('has cmd', function()
+      assert.are.same({ 'asciidoctor' }, presets.asciidoctor.cmd)
+    end)
+
+    it('returns args with file and output', function()
+      assert.are.same(
+        { '--failure-level', 'ERROR', '/tmp/document.adoc', '-o', '/tmp/document.html' },
+        presets.asciidoctor.args(adoc_ctx)
+      )
+    end)
+
+    it('returns html output path', function()
+      assert.are.equal('/tmp/document.html', presets.asciidoctor.output(adoc_ctx))
+    end)
+
+    it('returns clean command', function()
+      assert.are.same({ 'rm', '-f', '/tmp/document.html' }, presets.asciidoctor.clean(adoc_ctx))
+    end)
+
+    it('has open enabled', function()
+      assert.is_true(presets.asciidoctor.open)
+    end)
+
+    it('has reload enabled for SSE', function()
+      assert.is_true(presets.asciidoctor.reload)
+    end)
+
+    it('parses error messages', function()
+      local output =
+        'asciidoctor: ERROR: document.adoc: line 8: invalid part, must have at least one section'
+      local diagnostics = presets.asciidoctor.error_parser(output, adoc_ctx)
+      assert.are.equal(1, #diagnostics)
+      assert.are.equal(7, diagnostics[1].lnum)
+      assert.are.equal(0, diagnostics[1].col)
+      assert.are.equal('invalid part, must have at least one section', diagnostics[1].message)
+      assert.are.equal(vim.diagnostic.severity.ERROR, diagnostics[1].severity)
+    end)
+
+    it('parses warning messages', function()
+      local output = 'asciidoctor: WARNING: document.adoc: line 52: section title out of sequence'
+      local diagnostics = presets.asciidoctor.error_parser(output, adoc_ctx)
+      assert.are.equal(1, #diagnostics)
+      assert.are.equal(51, diagnostics[1].lnum)
+      assert.are.equal(vim.diagnostic.severity.WARN, diagnostics[1].severity)
+    end)
+
+    it('returns empty table for clean output', function()
+      assert.are.same({}, presets.asciidoctor.error_parser('', adoc_ctx))
+    end)
+  end)
+
+  describe('quarto', function()
+    local qmd_ctx = {
+      bufnr = 1,
+      file = '/tmp/document.qmd',
+      root = '/tmp',
+      ft = 'quarto',
+      output = '/tmp/document.html',
+    }
+
+    it('has ft', function()
+      assert.are.equal('quarto', presets.quarto.ft)
+    end)
+
+    it('has cmd', function()
+      assert.are.same({ 'quarto' }, presets.quarto.cmd)
+    end)
+
+    it('returns args with render subcommand and html format', function()
+      assert.are.same(
+        { 'render', '/tmp/document.qmd', '--to', 'html', '--embed-resources' },
+        presets.quarto.args(qmd_ctx)
+      )
+    end)
+
+    it('returns html output path', function()
+      assert.are.equal('/tmp/document.html', presets.quarto.output(qmd_ctx))
+    end)
+
+    it('returns clean command removing html and _files directory', function()
+      assert.are.same(
+        { 'rm', '-rf', '/tmp/document.html', '/tmp/document_files' },
+        presets.quarto.clean(qmd_ctx)
+      )
+    end)
+
+    it('has open enabled', function()
+      assert.is_true(presets.quarto.open)
+    end)
+
+    it('has reload enabled for SSE', function()
+      assert.is_true(presets.quarto.reload)
+    end)
+
+    it('has no error_parser', function()
+      assert.is_nil(presets.quarto.error_parser)
+    end)
+  end)
 end)

spec/reload_spec.lua

@@ -13,13 +13,13 @@ describe('reload', function()
   describe('inject', function()
     it('injects script before </body>', function()
       local path = os.tmpname()
-      local f = io.open(path, 'w')
+      local f = assert(io.open(path, 'w'))
       f:write('<html><body><p>hello</p></body></html>')
       f:close()
 
       reload.inject(path)
 
-      local fr = io.open(path, 'r')
+      local fr = assert(io.open(path, 'r'))
       local content = fr:read('*a')
       fr:close()
       os.remove(path)
@@ -33,13 +33,13 @@ describe('reload', function()
 
     it('appends script when no </body>', function()
       local path = os.tmpname()
-      local f = io.open(path, 'w')
+      local f = assert(io.open(path, 'w'))
       f:write('<html><p>hello</p></html>')
       f:close()
 
       reload.inject(path)
 
-      local fr = io.open(path, 'r')
+      local fr = assert(io.open(path, 'r'))
       local content = fr:read('*a')
       fr:close()
       os.remove(path)