Overleaf/services/web/frontend/js/ide/pdf/controllers/PdfController.js

import App from '../../../base'
import HumanReadableLogs from '../../human-readable-logs/HumanReadableLogs'
import BibLogParser from 'libs/bib-log-parser'
import PreviewPane from '../../../features/preview/components/preview-pane'
import { react2angular } from 'react2angular'
import { rootContext } from '../../../shared/context/root-context'
import 'ace/ace'

const AUTO_COMPILE_MAX_WAIT = 5000
// We add a 1 second debounce to sending user changes to server if they aren't
// collaborating with anyone. This needs to be higher than that, and allow for
// client to server latency, otherwise we compile before the op reaches the server
// and then again on ack.
const AUTO_COMPILE_DEBOUNCE = 2000

App.filter('trusted', $sce => url => $sce.trustAsResourceUrl(url))

App.controller('PdfController', function(
  $scope,
  $http,
  ide,
  $modal,
  synctex,
  eventTracking,
  localStorage,
  $q
) {
  let autoCompile = true

  // pdf.view = uncompiled | pdf | errors
  $scope.pdf.view = $scope.pdf.url ? 'pdf' : 'uncompiled'
  $scope.pdf.clearingCache = false
  $scope.shouldShowLogs = false

  $scope.logsUISubvariant = window.logsUISubvariant

  // view logic to check whether the files dropdown should "drop up" or "drop down"
  $scope.shouldDropUp = false

  // Exposed methods for React layout handling
  $scope.setPdfSplitLayout = function() {
    $scope.$applyAsync(() => $scope.switchToSideBySideLayout('editor'))
  }
  $scope.setPdfFullLayout = function() {
    $scope.$applyAsync(() => $scope.switchToFlatLayout('pdf'))
  }

  const logsContainerEl = document.querySelector('.pdf-logs')
  const filesDropdownEl =
    logsContainerEl && logsContainerEl.querySelector('.files-dropdown')

  // get the top coordinate of the files dropdown as a ratio (to the logs container height)
  // logs container supports scrollable content, so it's possible that ratio > 1.
  function getFilesDropdownTopCoordAsRatio() {
    if (filesDropdownEl == null || logsContainerEl == null) {
      return 0
    }
    return (
      filesDropdownEl.getBoundingClientRect().top /
      logsContainerEl.getBoundingClientRect().height
    )
  }

  $scope.$watch('shouldShowLogs', shouldShow => {
    if (shouldShow) {
      $scope.$applyAsync(() => {
        $scope.shouldDropUp = getFilesDropdownTopCoordAsRatio() > 0.65
      })
    }
  })

  $scope.trackLogHintsLearnMore = function() {
    eventTracking.sendMB('logs-hints-learn-more')
  }

  if (ace.require('ace/lib/useragent').isMac) {
    $scope.modifierKey = 'Cmd'
  } else {
    $scope.modifierKey = 'Ctrl'
  }

  // utility for making a query string from a hash, could use jquery $.param
  function createQueryString(args) {
    const qsArgs = []
    for (const k in args) {
      const v = args[k]
      qsArgs.push(`${k}=${v}`)
    }
    if (qsArgs.length) {
      return `?${qsArgs.join('&')}`
    } else {
      return ''
    }
  }

  $scope.$on('project:joined', () => {
    if (!autoCompile) {
      return
    }
    autoCompile = false
    $scope.recompile({ isAutoCompileOnLoad: true })
    $scope.hasPremiumCompile =
      $scope.project.features.compileGroup === 'priority'
  })

  $scope.$on('pdf:error:display', function() {
    $scope.pdf.view = 'errors'
    $scope.pdf.renderingError = true
  })

  let autoCompileInterval = null
  function autoCompileIfReady() {
    if (
      $scope.pdf.compiling ||
      !$scope.autocompile_enabled ||
      !$scope.pdf.uncompiled
    ) {
      return
    }

    // Only checking linting if syntaxValidation is on and visible to the user
    const autoCompileLintingError =
      ide.$scope.hasLintingError && ide.$scope.settings.syntaxValidation
    if ($scope.autoCompileLintingError !== autoCompileLintingError) {
      $scope.$apply(() => {
        $scope.autoCompileLintingError = autoCompileLintingError
        // We've likely been waiting a while until the user fixed the linting, but we
        // don't want to compile as soon as it is fixed, so reset the timeout.
        $scope.startedTryingAutoCompileAt = Date.now()
        $scope.docLastChangedAt = Date.now()
      })
    }
    if (autoCompileLintingError && $scope.stop_on_validation_error) {
      return
    }

    // If there's a longish compile, don't compile immediately after if user is still typing
    const startedTryingAt = Math.max(
      $scope.startedTryingAutoCompileAt,
      $scope.lastFinishedCompileAt || 0
    )

    const timeSinceStartedTrying = Date.now() - startedTryingAt
    const timeSinceLastChange = Date.now() - $scope.docLastChangedAt

    let shouldCompile = false
    if (timeSinceLastChange > AUTO_COMPILE_DEBOUNCE) {
      // Don't compile in the middle of the user typing
      shouldCompile = true
    } else if (timeSinceStartedTrying > AUTO_COMPILE_MAX_WAIT) {
      // Unless they type for a long time
      shouldCompile = true
    } else if (timeSinceStartedTrying < 0 || timeSinceLastChange < 0) {
      // If time is non-monotonic, assume that the user's system clock has been
      // changed and continue with compile
      shouldCompile = true
    }

    if (shouldCompile) {
      return triggerAutoCompile()
    }
  }

  function triggerAutoCompile() {
    $scope.recompile({ isAutoCompileOnChange: true })
  }

  function startTryingAutoCompile() {
    if (autoCompileInterval != null) {
      return
    }
    $scope.startedTryingAutoCompileAt = Date.now()
    autoCompileInterval = setInterval(autoCompileIfReady, 200)
  }

  function stopTryingAutoCompile() {
    clearInterval(autoCompileInterval)
    autoCompileInterval = null
  }

  $scope.changesToAutoCompile = false
  $scope.$watch('pdf.uncompiled', uncompiledChanges => {
    // don't autocompile if disabled or the pdf is not visible
    if (
      $scope.pdf.uncompiled &&
      $scope.autocompile_enabled &&
      !$scope.ui.pdfHidden
    ) {
      $scope.changesToAutoCompile = true
      startTryingAutoCompile()
    } else {
      $scope.changesToAutoCompile = false
      stopTryingAutoCompile()
    }
  })

  function recalculateUncompiledChanges() {
    if ($scope.docLastChangedAt == null) {
      $scope.pdf.uncompiled = false
    } else if (
      $scope.lastStartedCompileAt == null ||
      $scope.docLastChangedAt > $scope.lastStartedCompileAt
    ) {
      $scope.pdf.uncompiled = true
    } else {
      $scope.pdf.uncompiled = false
    }
  }

  function _updateDocLastChangedAt() {
    $scope.docLastChangedAt = Date.now()
    recalculateUncompiledChanges()
  }

  function onDocChanged() {
    $scope.autoCompileLintingError = false
    _updateDocLastChangedAt()
  }

  function onDocSaved() {
    // We use the save as a trigger too, to account for the delay between the client
    // and server. Otherwise, we might have compiled after the user made
    // the change on the client, but before the server had it.
    _updateDocLastChangedAt()
  }

  function onCompilingStateChanged(compiling) {
    recalculateUncompiledChanges()
  }

  ide.$scope.$on('doc:changed', onDocChanged)
  ide.$scope.$on('doc:saved', onDocSaved)
  $scope.$watch('pdf.compiling', onCompilingStateChanged)

  $scope.autocompile_enabled =
    localStorage(`autocompile_enabled:${$scope.project_id}`) || false
  $scope.$watch('autocompile_enabled', (newValue, oldValue) => {
    if (newValue != null && oldValue !== newValue) {
      if (newValue === true) {
        autoCompileIfReady()
      }
      localStorage(`autocompile_enabled:${$scope.project_id}`, newValue)
      eventTracking.sendMB('autocompile-setting-changed', {
        value: newValue
      })
    }
  })

  // abort compile if syntax checks fail
  $scope.stop_on_validation_error = localStorage(
    `stop_on_validation_error:${$scope.project_id}`
  )
  if ($scope.stop_on_validation_error == null) {
    $scope.stop_on_validation_error = true
  }
  // turn on for all users by default
  $scope.$watch('stop_on_validation_error', (newValue, oldValue) => {
    if (newValue != null && oldValue !== newValue) {
      localStorage(`stop_on_validation_error:${$scope.project_id}`, newValue)
    }
  })

  $scope.draft = localStorage(`draft:${$scope.project_id}`) || false
  $scope.$watch('draft', (newValue, oldValue) => {
    if (newValue != null && oldValue !== newValue) {
      localStorage(`draft:${$scope.project_id}`, newValue)
    }
  })

  function sendCompileRequest(options) {
    if (options == null) {
      options = {}
    }
    const url = `/project/${$scope.project_id}/compile`
    const params = {}
    if (options.isAutoCompileOnLoad || options.isAutoCompileOnChange) {
      params.auto_compile = true
    }
    // if the previous run was a check, clear the error logs
    if ($scope.check) {
      $scope.pdf.logEntries = {}
    }
    // keep track of whether this is a compile or check
    $scope.check = !!options.check
    if (options.check) {
      eventTracking.sendMB('syntax-check-request')
    }
    // send appropriate check type to clsi
    let checkType
    if ($scope.check) {
      checkType = 'validate' // validate only
    } else if (options.try) {
      checkType = 'silent' // allow use to try compile once
    } else if ($scope.stop_on_validation_error) {
      checkType = 'error' // try to compile
    } else {
      checkType = 'silent' // ignore errors
    }

    // FIXME: Temporarily disable syntax checking as it is causing
    // excessive support requests for projects migrated from v1
    // https://github.com/overleaf/sharelatex/issues/911
    if (checkType === 'error') {
      checkType = 'silent'
    }

    return $http.post(
      url,
      {
        rootDoc_id: options.rootDocOverride_id || null,
        draft: $scope.draft,
        check: checkType,
        // use incremental compile for all users but revert to a full
        // compile if there is a server error
        incrementalCompilesEnabled: !$scope.pdf.error,
        _csrf: window.csrfToken
      },
      { params }
    )
  }

  function buildPdfDownloadUrl(pdfDownloadDomain, url) {
    if (pdfDownloadDomain) {
      return `${pdfDownloadDomain}${url}`
    } else {
      return url
    }
  }

  function parseCompileResponse(response) {
    // keep last url
    const lastPdfUrl = $scope.pdf.url
    const { pdfDownloadDomain } = response
    // Reset everything
    $scope.pdf.error = false
    $scope.pdf.timedout = false
    $scope.pdf.failure = false
    $scope.pdf.url = null
    $scope.pdf.clsiMaintenance = false
    $scope.pdf.tooRecentlyCompiled = false
    $scope.pdf.renderingError = false
    $scope.pdf.projectTooLarge = false
    $scope.pdf.compileTerminated = false
    $scope.pdf.compileExited = false
    $scope.pdf.failedCheck = false
    $scope.pdf.compileInProgress = false
    $scope.pdf.autoCompileDisabled = false
    if (window.showNewLogsUI) {
      $scope.clsiErrors = {}
    }

    // make a cache to look up files by name
    const fileByPath = {}
    if (response.outputFiles != null) {
      for (const file of response.outputFiles) {
        fileByPath[file.path] = file
      }
    }

    // prepare query string
    let qs = {}
    // add a query string parameter for the compile group
    if (response.compileGroup != null) {
      ide.compileGroup = qs.compileGroup = response.compileGroup
    }
    // add a query string parameter for the clsi server id
    if (response.clsiServerId != null) {
      ide.clsiServerId = qs.clsiserverid = response.clsiServerId
    }

    // TODO(das7pad): drop this hack once 2747f0d40af8729304 has landed in clsi
    if (response.status === 'success' && !fileByPath['output.pdf']) {
      response.status = 'failure'
    }

    if (response.status === 'success') {
      $scope.pdf.view = 'pdf'
      $scope.shouldShowLogs = false
      $scope.pdf.lastCompileTimestamp = Date.now()
      $scope.pdf.validation = {}
      $scope.pdf.url = buildPdfDownloadUrl(
        pdfDownloadDomain,
        fileByPath['output.pdf'].url
      )
      // convert the qs hash into a query string and append it
      $scope.pdf.url += createQueryString(qs)

      // Save all downloads as files
      qs.popupDownload = true

      const { build: buildId } = fileByPath['output.pdf']
      $scope.pdf.downloadUrl =
        `/download/project/${$scope.project_id}/build/${buildId}/output/output.pdf` +
        createQueryString(qs)
      fetchLogs(fileByPath, { pdfDownloadDomain })
    } else if (response.status === 'timedout') {
      $scope.pdf.view = 'errors'
      $scope.pdf.timedout = true
      fetchLogs(fileByPath, { pdfDownloadDomain })
      if (
        !$scope.hasPremiumCompile &&
        ide.$scope.project.owner._id === ide.$scope.user.id
      ) {
        eventTracking.send(
          'subscription-funnel',
          'editor-click-feature',
          'compile-timeout'
        )
      }
    } else if (response.status === 'terminated') {
      $scope.pdf.view = 'errors'
      $scope.pdf.compileTerminated = true
      fetchLogs(fileByPath, { pdfDownloadDomain })
    } else if (
      ['validation-fail', 'validation-pass'].includes(response.status)
    ) {
      $scope.pdf.view = 'pdf'
      $scope.pdf.url = lastPdfUrl
      $scope.shouldShowLogs = true
      if (response.status === 'validation-fail') {
        $scope.pdf.failedCheck = true
      }
      eventTracking.sendMB(`syntax-check-${response.status}`)
      fetchLogs(fileByPath, { validation: true, pdfDownloadDomain })
    } else if (response.status === 'exited') {
      $scope.pdf.view = 'pdf'
      $scope.pdf.compileExited = true
      $scope.pdf.url = lastPdfUrl
      $scope.shouldShowLogs = true
      fetchLogs(fileByPath, { pdfDownloadDomain })
    } else if (response.status === 'autocompile-backoff') {
      if ($scope.pdf.isAutoCompileOnLoad) {
        // initial autocompile
        $scope.pdf.view = 'uncompiled'
      } else {
        // background autocompile from typing
        $scope.pdf.view = 'errors'
        $scope.pdf.autoCompileDisabled = true
        $scope.autocompile_enabled = false // disable any further autocompiles
        eventTracking.sendMB('autocompile-rate-limited', {
          hasPremiumCompile: $scope.hasPremiumCompile
        })
      }
    } else if (response.status === 'project-too-large') {
      $scope.pdf.view = 'errors'
      $scope.pdf.projectTooLarge = true
    } else if (response.status === 'failure') {
      $scope.pdf.view = 'errors'
      $scope.pdf.failure = true
      $scope.shouldShowLogs = true
      fetchLogs(fileByPath, { pdfDownloadDomain })
    } else if (response.status === 'clsi-maintenance') {
      $scope.pdf.view = 'errors'
      $scope.pdf.clsiMaintenance = true
    } else if (response.status === 'unavailable') {
      $scope.pdf.view = 'errors'
      $scope.pdf.clsiUnavailable = true
    } else if (response.status === 'too-recently-compiled') {
      $scope.pdf.view = 'errors'
      $scope.pdf.tooRecentlyCompiled = true
    } else if (response.status === 'validation-problems') {
      $scope.pdf.view = 'validation-problems'
      $scope.pdf.validation = response.validationProblems
      $scope.shouldShowLogs = false
    } else if (response.status === 'compile-in-progress') {
      $scope.pdf.view = 'errors'
      $scope.pdf.compileInProgress = true
    } else {
      // fall back to displaying an error
      $scope.pdf.view = 'errors'
      $scope.pdf.error = true
    }

    if (window.showNewLogsUI) {
      $scope.pdf.compileFailed = false
      // `$scope.clsiErrors` stores the error states nested within `$scope.pdf`
      // for use with React's <PreviewPane errors={$scope.clsiErrors}/>
      $scope.clsiErrors = Object.assign(
        {},
        $scope.pdf.error ? { error: true } : null,
        $scope.pdf.renderingError ? { renderingError: true } : null,
        $scope.pdf.clsiMaintenance ? { clsiMaintenance: true } : null,
        $scope.pdf.clsiUnavailable ? { clsiUnavailable: true } : null,
        $scope.pdf.tooRecentlyCompiled ? { tooRecentlyCompiled: true } : null,
        $scope.pdf.compileTerminated ? { compileTerminated: true } : null,
        $scope.pdf.rateLimited ? { rateLimited: true } : null,
        $scope.pdf.compileInProgress ? { compileInProgress: true } : null,
        $scope.pdf.timedout ? { timedout: true } : null,
        $scope.pdf.autoCompileDisabled ? { autoCompileDisabled: true } : null
      )

      if (
        $scope.pdf.view === 'errors' ||
        $scope.pdf.view === 'validation-problems'
      ) {
        $scope.shouldShowLogs = true
        $scope.pdf.compileFailed = true
      }
    }

    const IGNORE_FILES = ['output.fls', 'output.fdb_latexmk']
    $scope.pdf.outputFiles = []

    if (response.outputFiles == null) {
      return
    }

    // prepare list of output files for download dropdown
    qs = {}
    if (response.clsiServerId != null) {
      qs.clsiserverid = response.clsiServerId
    }
    for (const file of response.outputFiles) {
      if (IGNORE_FILES.indexOf(file.path) === -1) {
        const isOutputFile = /^output\./.test(file.path)
        $scope.pdf.outputFiles.push({
          // Turn 'output.blg' into 'blg file'.
          name: isOutputFile
            ? `${file.path.replace(/^output\./, '')} file`
            : file.path,
          url: file.url + createQueryString(qs),
          main: !!isOutputFile,
          fileName: file.path,
          type: file.type
        })
      }
    }

    // sort the output files into order, main files first, then others
    $scope.pdf.outputFiles.sort(
      (a, b) => b.main - a.main || a.name.localeCompare(b.name)
    )
  }

  function fetchLogs(fileByPath, options) {
    let blgFile, chktexFile, logFile
    $scope.pdf.logEntries = {}

    if (options != null ? options.validation : undefined) {
      chktexFile = fileByPath['output.chktex']
    } else {
      logFile = fileByPath['output.log']
      blgFile = fileByPath['output.blg']
    }

    function getFile(name, file) {
      const opts = {
        method: 'GET',
        url: buildPdfDownloadUrl(options.pdfDownloadDomain, file.url),
        params: {
          compileGroup: ide.compileGroup,
          clsiserverid: ide.clsiServerId
        }
      }
      return $http(opts)
    }

    // accumulate the log entries
    const logEntries = {
      all: [],
      errors: [],
      warnings: [],
      typesetting: []
    }

    function accumulateResults(newEntries) {
      for (let key of ['all', 'errors', 'warnings', 'typesetting']) {
        if (newEntries[key]) {
          if (newEntries.type != null) {
            for (let entry of newEntries[key]) {
              entry.type = newEntries.type
            }
          }
          logEntries[key] = logEntries[key].concat(newEntries[key])
        }
      }
    }

    // use the parsers for each file type
    function processLog(log) {
      $scope.pdf.rawLog = log
      const { errors, warnings, typesetting } = HumanReadableLogs.parse(log, {
        ignoreDuplicates: true
      })
      const all = [].concat(errors, warnings, typesetting)
      accumulateResults({ all, errors, warnings, typesetting })
    }

    function processChkTex(log) {
      const errors = []
      const warnings = []
      for (let line of log.split('\n')) {
        var m
        if ((m = line.match(/^(\S+):(\d+):(\d+): (Error|Warning): (.*)/))) {
          const result = {
            file: m[1],
            line: m[2],
            column: m[3],
            level: m[4].toLowerCase(),
            message: `${m[4]}: ${m[5]}`
          }
          if (result.level === 'error') {
            errors.push(result)
          } else {
            warnings.push(result)
          }
        }
      }
      const all = [].concat(errors, warnings)
      const logHints = HumanReadableLogs.parse({
        type: 'Syntax',
        all,
        errors,
        warnings
      })
      eventTracking.sendMB('syntax-check-return-count', {
        errors: errors.length,
        warnings: warnings.length
      })
      accumulateResults(logHints)
    }

    function processBiber(log) {
      const { errors, warnings } = BibLogParser.parse(log, {})
      const all = [].concat(errors, warnings)
      accumulateResults({ type: 'BibTeX:', all, errors, warnings })
    }

    // output the results
    function handleError() {
      $scope.pdf.logEntries = {}
      $scope.pdf.rawLog = ''
    }

    function annotateFiles() {
      $scope.pdf.logEntries = logEntries
      $scope.pdf.logEntryAnnotations = {}
      for (const entry of logEntries.all) {
        if (entry.file != null) {
          entry.file = normalizeFilePath(entry.file)
          const entity = ide.fileTreeManager.findEntityByPath(entry.file)
          if (entity != null) {
            if (!$scope.pdf.logEntryAnnotations[entity.id]) {
              $scope.pdf.logEntryAnnotations[entity.id] = []
            }
            $scope.pdf.logEntryAnnotations[entity.id].push({
              row: entry.line - 1,
              type: entry.level === 'error' ? 'error' : 'warning',
              text: entry.message
            })
          }
        }
      }
    }

    // retrieve the logfile and process it
    let response
    if (logFile != null) {
      response = getFile('output.log', logFile).then(response =>
        processLog(response.data)
      )

      if (blgFile != null) {
        // retrieve the blg file if present
        response = response.then(() =>
          getFile('output.blg', blgFile).then(
            response => processBiber(response.data),
            () => true
          )
        )
      }
    }

    if (response != null) {
      response.catch(handleError)
    } else {
      handleError()
    }

    if (chktexFile != null) {
      const getChkTex = () =>
        getFile('output.chktex', chktexFile).then(response =>
          processChkTex(response.data)
        )
      // always retrieve the chktex file if present
      if (response != null) {
        response = response.then(getChkTex, getChkTex)
      } else {
        response = getChkTex()
      }
    }

    // display the combined result
    if (response != null) {
      response.finally(() => {
        annotateFiles()
        sendCompileMetrics()
      })
    }
  }

  function sendCompileMetrics() {
    const hasCompiled =
      $scope.pdf.view !== 'errors' && $scope.pdf.view !== 'validation-problems'
    const sendMetricsForUser =
      window.user.betaProgram && !window.user.alphaProgram

    if (hasCompiled && sendMetricsForUser) {
      const metadata = {
        errors: $scope.pdf.logEntries.errors.length,
        warnings: $scope.pdf.logEntries.warnings.length,
        typesetting: $scope.pdf.logEntries.typesetting.length,
        newLogsUI: window.showNewLogsUI,
        subvariant: window.logsUISubvariant
      }
      eventTracking.sendMBSampled(
        'compile-result',
        JSON.stringify(metadata),
        0.05
      )
    }
  }

  function getRootDocOverrideId() {
    const rootDocId = $scope.project.rootDoc_id
    const currentDocId = ide.editorManager.getCurrentDocId()
    if (currentDocId === rootDocId) {
      return null // no need to override when in the root doc itself
    }
    const doc = ide.editorManager.getCurrentDocValue()
    if (doc == null) {
      return null
    }
    for (let line of doc.split('\n')) {
      if (/^[^%]*\\documentclass/.test(line)) {
        return ide.editorManager.getCurrentDocId()
      }
    }
    return null
  }

  function normalizeFilePath(path) {
    path = path.replace(
      /^(.*)\/compiles\/[0-9a-f]{24}(-[0-9a-f]{24})?\/(\.\/)?/,
      ''
    )
    path = path.replace(/^\/compile\//, '')

    const rootDocDirname = ide.fileTreeManager.getRootDocDirname()
    if (rootDocDirname != null) {
      path = path.replace(/^\.\//, rootDocDirname + '/')
    }

    return path
  }

  $scope.recompile = function(options) {
    if (options == null) {
      options = {}
    }
    if ($scope.pdf.compiling) {
      return
    }

    eventTracking.sendMBSampled('editor-recompile-sampled', options)

    $scope.lastStartedCompileAt = Date.now()
    $scope.pdf.compiling = true
    $scope.pdf.isAutoCompileOnLoad =
      options != null ? options.isAutoCompileOnLoad : undefined // initial autocompile

    if (options != null ? options.force : undefined) {
      // for forced compile, turn off validation check and ignore errors
      $scope.stop_on_validation_error = false
      $scope.shouldShowLogs = false // hide the logs while compiling
      eventTracking.sendMB('syntax-check-turn-off-checking')
    }

    if (options != null ? options.try : undefined) {
      $scope.shouldShowLogs = false // hide the logs while compiling
      eventTracking.sendMB('syntax-check-try-compile-anyway')
    }

    ide.$scope.$broadcast('flush-changes')

    options.rootDocOverride_id = getRootDocOverrideId()

    sendCompileRequest(options)
      .then(function(response) {
        const { data } = response
        $scope.pdf.view = 'pdf'
        $scope.pdf.compiling = false
        parseCompileResponse(data)
      })
      .catch(function(response) {
        const { status } = response
        if (status === 429) {
          $scope.pdf.rateLimited = true
        }
        $scope.pdf.compiling = false
        $scope.pdf.renderingError = false
        $scope.pdf.error = true
        $scope.pdf.view = 'errors'
        if (window.showNewLogsUI) {
          $scope.clsiErrors = { error: true }
          $scope.shouldShowLogs = true
          $scope.pdf.compileFailed = true
        }
      })
      .finally(() => {
        $scope.lastFinishedCompileAt = Date.now()
      })
  }

  // This needs to be public.
  ide.$scope.recompile = $scope.recompile
  // This method is a simply wrapper and exists only for tracking purposes.
  ide.$scope.recompileViaKey = function() {
    $scope.recompile({ keyShortcut: true })
  }

  $scope.stop = function() {
    if (!$scope.pdf.compiling) {
      return
    }

    return $http({
      url: `/project/${$scope.project_id}/compile/stop`,
      method: 'POST',
      params: {
        clsiserverid: ide.clsiServerId
      },
      headers: {
        'X-Csrf-Token': window.csrfToken
      }
    })
  }

  $scope.clearCache = function() {
    $scope.pdf.clearingCache = true
    const deferred = $q.defer()

    // disable various download buttons
    $scope.pdf.url = null
    $scope.pdf.downloadUrl = null
    $scope.pdf.outputFiles = []

    $http({
      url: `/project/${$scope.project_id}/output`,
      method: 'DELETE',
      params: {
        clsiserverid: ide.clsiServerId
      },
      headers: {
        'X-Csrf-Token': window.csrfToken
      }
    })
      .then(function(response) {
        $scope.pdf.clearingCache = false
        return deferred.resolve()
      })
      .catch(function(response) {
        console.error(response)
        const error = response.data
        $scope.pdf.clearingCache = false
        $scope.pdf.renderingError = false
        $scope.pdf.error = true
        $scope.pdf.view = 'errors'
        return deferred.reject(error)
      })
    return deferred.promise
  }

  $scope.recompileFromScratch = function() {
    $scope.pdf.compiling = true
    return $scope
      .clearCache()
      .then(() => {
        $scope.pdf.compiling = false
        $scope.recompile()
      })
      .catch(error => {
        console.error(error)
      })
  }

  $scope.toggleLogs = function() {
    $scope.$applyAsync(() => {
      $scope.shouldShowLogs = !$scope.shouldShowLogs
      if ($scope.shouldShowLogs) {
        eventTracking.sendMBOnce('ide-open-logs-once')
      }
    })
  }

  $scope.showPdf = function() {
    $scope.pdf.view = 'pdf'
    $scope.shouldShowLogs = false
  }

  $scope.toggleRawLog = function() {
    $scope.pdf.showRawLog = !$scope.pdf.showRawLog
    if ($scope.pdf.showRawLog) {
      eventTracking.sendMB('logs-view-raw')
    }
  }

  $scope.openClearCacheModal = function() {
    $modal.open({
      templateUrl: 'clearCacheModalTemplate',
      controller: 'ClearCacheModalController',
      scope: $scope
    })
  }

  $scope.syncToCode = function(position) {
    synctex.syncToCode(position).then(function(data) {
      const { doc, line } = data
      ide.editorManager.openDoc(doc, { gotoLine: line })
    })
  }

  $scope.setAutoCompile = function(isOn) {
    $scope.$applyAsync(function() {
      $scope.autocompile_enabled = isOn
    })
  }
  $scope.setDraftMode = function(isOn) {
    $scope.$applyAsync(function() {
      $scope.draft = isOn
    })
  }
  $scope.setSyntaxCheck = function(isOn) {
    $scope.$applyAsync(function() {
      $scope.stop_on_validation_error = isOn
    })
  }
  $scope.runSyntaxCheckNow = function() {
    $scope.$applyAsync(function() {
      $scope.recompile({ check: true })
    })
  }

  $scope.openInEditor = function(entry) {
    let column, line
    eventTracking.sendMBOnce('logs-jump-to-location-once')
    const entity = ide.fileTreeManager.findEntityByPath(entry.file)
    if (entity == null || entity.type !== 'doc') {
      return
    }
    if (entry.line != null) {
      line = entry.line
    }
    if (entry.column != null) {
      column = entry.column
    }
    ide.editorManager.openDoc(entity, {
      gotoLine: line,
      gotoColumn: column
    })
  }
})

App.factory('synctex', function(ide, $http, $q) {
  const synctex = {
    syncToPdfInFlight: false,
    syncToCodeInFlight: false,

    syncToPdf(cursorPosition) {
      const deferred = $q.defer()

      const docId = ide.editorManager.getCurrentDocId()
      if (docId == null) {
        deferred.reject()
        return deferred.promise
      }
      const doc = ide.fileTreeManager.findEntityById(docId)
      if (doc == null) {
        deferred.reject()
        return deferred.promise
      }
      let path = ide.fileTreeManager.getEntityPath(doc)
      if (path == null) {
        deferred.reject()
        return deferred.promise
      }

      // If the root file is folder/main.tex, then synctex sees the
      // path as folder/./main.tex
      const rootDocDirname = ide.fileTreeManager.getRootDocDirname()
      if (rootDocDirname != null && rootDocDirname !== '') {
        path = path.replace(RegExp(`^${rootDocDirname}`), `${rootDocDirname}/.`)
      }

      const { row, column } = cursorPosition

      this.syncToPdfInFlight = true

      $http({
        url: `/project/${ide.project_id}/sync/code`,
        method: 'GET',
        params: {
          file: path,
          line: row + 1,
          column,
          clsiserverid: ide.clsiServerId
        }
      })
        .then(response => {
          this.syncToPdfInFlight = false
          const { data } = response
          return deferred.resolve(data.pdf || [])
        })
        .catch(response => {
          this.syncToPdfInFlight = false
          const error = response.data
          return deferred.reject(error)
        })

      return deferred.promise
    },

    syncToCode(position, options) {
      if (options == null) {
        options = {}
      }
      const deferred = $q.defer()
      if (position == null) {
        deferred.reject()
        return deferred.promise
      }

      // FIXME: this actually works better if it's halfway across the
      // page (or the visible part of the page). Synctex doesn't
      // always find the right place in the file when the point is at
      // the edge of the page, it sometimes returns the start of the
      // next paragraph instead.
      const h = position.offset.left

      // Compute the vertical position to pass to synctex, which
      // works with coordinates increasing from the top of the page
      // down.  This matches the browser's DOM coordinate of the
      // click point, but the pdf position is measured from the
      // bottom of the page so we need to invert it.
      let v
      if (
        options.fromPdfPosition &&
        (position.pageSize != null ? position.pageSize.height : undefined) !=
          null
      ) {
        v = position.pageSize.height - position.offset.top || 0 // measure from pdf point (inverted)
      } else {
        v = position.offset.top || 0 // measure from html click position
      }

      // It's not clear exactly where we should sync to if it wasn't directly
      // clicked on, but a little bit down from the very top seems best.
      if (options.includeVisualOffset) {
        v += 72 // use the same value as in pdfViewer highlighting visual offset
      }

      this.syncToCodeInFlight = true

      $http({
        url: `/project/${ide.project_id}/sync/pdf`,
        method: 'GET',
        params: {
          page: position.page + 1,
          h: h.toFixed(2),
          v: v.toFixed(2),
          clsiserverid: ide.clsiServerId
        }
      })
        .then(response => {
          this.syncToCodeInFlight = false
          const { data } = response
          if (
            data.code != null &&
            data.code.length > 0 &&
            data.code[0].file !== ''
          ) {
            const doc = ide.fileTreeManager.findEntityByPath(data.code[0].file)
            if (doc == null) {
              deferred.reject()
            }
            return deferred.resolve({ doc, line: data.code[0].line })
          } else if (data.code[0].file === '') {
            ide.$scope.sync_tex_error = true
            setTimeout(() => (ide.$scope.sync_tex_error = false), 4000)
          }
        })
        .catch(response => {
          this.syncToCodeInFlight = false
          const error = response.data
          return deferred.reject(error)
        })

      return deferred.promise
    }
  }

  return synctex
})

App.controller('PdfSynctexController', function($scope, synctex, ide) {
  this.cursorPosition = null

  $scope.$watch(
    () => synctex.syncToPdfInFlight,
    value => ($scope.syncToPdfInFlight = value)
  )
  $scope.$watch(
    () => synctex.syncToCodeInFlight,
    value => ($scope.syncToCodeInFlight = value)
  )

  ide.$scope.$on('cursor:editor:update', (event, cursorPosition) => {
    this.cursorPosition = cursorPosition
  })

  $scope.syncToPdf = () => {
    if (this.cursorPosition == null) {
      return
    }
    synctex.syncToPdf(this.cursorPosition).then(highlights => {
      $scope.pdf.highlights = highlights
    })
  }

  ide.$scope.$on('cursor:editor:syncToPdf', $scope.syncToPdf)

  $scope.syncToCode = function() {
    synctex
      .syncToCode($scope.pdf.position, {
        includeVisualOffset: true,
        fromPdfPosition: true
      })
      .then(function(data) {
        const { doc, line } = data
        ide.editorManager.openDoc(doc, { gotoLine: line })
      })
  }
})

App.controller('ClearCacheModalController', function($scope, $modalInstance) {
  $scope.state = { error: false, inflight: false }

  $scope.clear = function() {
    $scope.state.inflight = true
    $scope
      .clearCache()
      .then(function() {
        $scope.state.inflight = false
        $modalInstance.close()
      })
      .catch(function() {
        $scope.state.error = true
        $scope.state.inflight = false
      })
  }

  $scope.cancel = () => $modalInstance.dismiss('cancel')
})
// Wrap React component as Angular component. Only needed for "top-level" component
App.component(
  'previewPane',
  react2angular(
    rootContext.use(PreviewPane),
    Object.keys(PreviewPane.propTypes)
  )
)