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feat(reload): add SSE live-reload server module

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Problem: HTML output from pandoc has no live-reload; the browser must
be refreshed manually after each compile.

Solution: add lua/preview/reload.lua — a minimal SSE-only TCP server.
start() binds 127.0.0.1:5554 and keeps EventSource connections alive;
broadcast() pushes a reload event to all clients; inject() appends an
EventSource script before </body> (or at EOF) on every compile so
pandoc overwrites do not lose the tag.
This commit is contained in:
Barrett Ruth 2026-03-03 16:23:35 -05:00
parent bce3cec0e6
commit 6c1609cba8
Signed by: barrett
GPG key ID: A6C96C9349D2FC81
2 changed files with 166 additions and 0 deletions
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58
spec/reload_spec.lua Normal file
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describe('reload', function()
local reload
before_each(function()
package.loaded['preview.reload'] = nil
reload = require('preview.reload')
end)
after_each(function()
reload.stop()
end)
describe('inject', function()
it('injects script before </body>', function()
local path = os.tmpname()
local f = 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 content = fr:read('*a')
fr:close()
os.remove(path)
assert.is_truthy(content:find('EventSource', 1, true))
local script_pos = content:find('EventSource', 1, true)
local body_pos = content:find('</body>', 1, true)
assert.is_truthy(body_pos)
assert.is_true(script_pos < body_pos)
end)
it('appends script when no </body>', function()
local path = os.tmpname()
local f = io.open(path, 'w')
f:write('<html><p>hello</p></html>')
f:close()
reload.inject(path)
local fr = io.open(path, 'r')
local content = fr:read('*a')
fr:close()
os.remove(path)
assert.is_truthy(content:find('EventSource', 1, true))
end)
end)
describe('broadcast', function()
it('does not error with no clients', function()
assert.has_no.errors(function()
reload.broadcast()
end)
end)
end)
end)