feat: rename everything

lua/diffs/parser.lua

@@ -0,0 +1,124 @@
+---@class diffs.Hunk
+---@field filename string
+---@field ft string?
+---@field lang string?
+---@field start_line integer
+---@field header_context string?
+---@field header_context_col integer?
+---@field lines string[]
+
+local M = {}
+
+local dbg = require('diffs.log').dbg
+
+---@param filename string
+---@return string?
+local function get_ft_from_filename(filename)
+  local ft = vim.filetype.match({ filename = filename })
+  if not ft then
+    dbg('no filetype for: %s', filename)
+  end
+  return ft
+end
+
+---@param ft string
+---@return string?
+local function get_lang_from_ft(ft)
+  local lang = vim.treesitter.language.get_lang(ft)
+  if lang then
+    local ok = pcall(vim.treesitter.language.inspect, lang)
+    if ok then
+      return lang
+    end
+    dbg('no parser for lang: %s (ft: %s)', lang, ft)
+  else
+    dbg('no ts lang for filetype: %s', ft)
+  end
+  return nil
+end
+
+---@param bufnr integer
+---@return diffs.Hunk[]
+function M.parse_buffer(bufnr)
+  local lines = vim.api.nvim_buf_get_lines(bufnr, 0, -1, false)
+  ---@type diffs.Hunk[]
+  local hunks = {}
+
+  ---@type string?
+  local current_filename = nil
+  ---@type string?
+  local current_ft = nil
+  ---@type string?
+  local current_lang = nil
+  ---@type integer?
+  local hunk_start = nil
+  ---@type string?
+  local hunk_header_context = nil
+  ---@type integer?
+  local hunk_header_context_col = nil
+  ---@type string[]
+  local hunk_lines = {}
+
+  local function flush_hunk()
+    if hunk_start and #hunk_lines > 0 and (current_lang or current_ft) then
+      table.insert(hunks, {
+        filename = current_filename,
+        ft = current_ft,
+        lang = current_lang,
+        start_line = hunk_start,
+        header_context = hunk_header_context,
+        header_context_col = hunk_header_context_col,
+        lines = hunk_lines,
+      })
+    end
+    hunk_start = nil
+    hunk_header_context = nil
+    hunk_header_context_col = nil
+    hunk_lines = {}
+  end
+
+  for i, line in ipairs(lines) do
+    local filename = line:match('^[MADRC%?!]%s+(.+)$') or line:match('^diff %-%-git a/.+ b/(.+)$')
+    if filename then
+      flush_hunk()
+      current_filename = filename
+      current_ft = get_ft_from_filename(filename)
+      current_lang = current_ft and get_lang_from_ft(current_ft) or nil
+      if current_lang then
+        dbg('file: %s -> lang: %s', filename, current_lang)
+      elseif current_ft then
+        dbg('file: %s -> ft: %s (no ts parser)', filename, current_ft)
+      end
+    elseif line:match('^@@.-@@') then
+      flush_hunk()
+      hunk_start = i
+      local prefix, context = line:match('^(@@.-@@%s*)(.*)')
+      if context and context ~= '' then
+        hunk_header_context = context
+        hunk_header_context_col = #prefix
+      end
+    elseif hunk_start then
+      local prefix = line:sub(1, 1)
+      if prefix == ' ' or prefix == '+' or prefix == '-' then
+        table.insert(hunk_lines, line)
+      elseif
+        line == ''
+        or line:match('^[MADRC%?!]%s+')
+        or line:match('^diff ')
+        or line:match('^index ')
+        or line:match('^Binary ')
+      then
+        flush_hunk()
+        current_filename = nil
+        current_ft = nil
+        current_lang = nil
+      end
+    end
+  end
+
+  flush_hunk()
+
+  return hunks
+end
+
+return M