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{CompositeDisposable} = require 'atom'
module.exports =
class LineNumberView
constructor: (@editor) ->
@subscriptions = new CompositeDisposable()
@editorView = atom.views.getView(@editor)
@trueNumberCurrentLine = atom.config.get('relative-line-numbers.trueNumberCurrentLine')
@showNormalLineNumbers = atom.config.get('relative-line-numbers.showNormalLineNumbers')
# Subscribe for when the line numbers should be updated.
@subscriptions.add(@editor.onDidChangeCursorPosition(@_update))
@subscriptions.add(@editor.onDidStopChanging(@_update))
# Subscribe to when the true number on current line config is modified.
@subscriptions.add atom.config.onDidChange 'relative-line-numbers.trueNumberCurrentLine', =>
@trueNumberCurrentLine = atom.config.get('relative-line-numbers.trueNumberCurrentLine')
@_update()
# Subscribe to when the show normal line numbers config is modified.
@subscriptions.add atom.config.onDidChange 'relative-line-numbers.showNormalLineNumbers', =>
@showNormalLineNumbers = atom.config.get('relative-line-numbers.showNormalLineNumbers')
@_update()
# Dispose the subscriptions when the editor is destroyed.
@subscriptions.add @editor.onDidDestroy =>
@subscriptions.dispose()
@_update()
_spacer: (totalLines, currentIndex) ->
Array(totalLines.toString().length - currentIndex.toString().length + 1).join ' '
# Update the line numbers on the editor
_update: () =>
totalLines = @editor.getLineCount()
currentLineNumber = @editor.getCursorScreenPosition().row + 1
lineNumberElements = @editorView.rootElement?.querySelectorAll('.line-number')
index = @_index(totalLines, currentLineNumber)
for lineNumberElement in lineNumberElements
row = lineNumberElement.getAttribute('data-buffer-row')
relative = index[row] or = 0
normalLineNumbers = ''
if @showNormalLineNumbers
humanRow = parseInt(row) + 1
normalLineNumbers = humanRow + @_spacer(totalLines, humanRow) + " "
lineNumberElement.innerHTML = "#{normalLineNumbers}#{relative}<div class=\"icon-right\"></div>"
# Return a lookup array with the relative line numbers
_index: (totalLines, currentLineNumber) ->
for line in [0...totalLines]
lineNumber = (Math.abs(currentLineNumber - (line + 1)))
if @trueNumberCurrentLine and lineNumber == 0
if @showNormalLineNumbers
'•'
else
currentLineNumber
else
lineNumber
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