overleaf/services/web/app/coffee/Features/Project/ProjectRootDocManager.coffee

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ProjectEntityHandler = require "./ProjectEntityHandler"
ProjectEntityUpdateHandler = require "./ProjectEntityUpdateHandler"
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Path = require "path"
async = require("async")
_ = require("underscore")
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module.exports = ProjectRootDocManager =
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setRootDocAutomatically: (project_id, callback = (error) ->) ->
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ProjectEntityHandler.getAllDocs project_id, (error, docs) ->
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return callback(error) if error?
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root_doc_id = null
jobs = _.map docs, (doc, path)->
return (cb)->
rootDocId = null
for line in doc.lines || []
# We've had problems with this regex locking up CPU.
# Previously /.*\\documentclass/ would totally lock up on lines of 500kb (data text files :()
# This regex will only look from the start of the line, including whitespace so will return quickly
# regardless of line length.
match = /^\s*\\documentclass/.test(line)
isRootDoc = /\.R?tex$/.test(Path.extname(path)) and match
if isRootDoc
rootDocId = doc?._id
cb(rootDocId)
async.series jobs, (root_doc_id)->
if root_doc_id?
ProjectEntityUpdateHandler.setRootDoc project_id, root_doc_id, callback
else
callback()