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Add support for https://prettier.io
This change adds the Prettier (https://prettier.io) JavaScript formatter. Fixes: #89
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‎README.md

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@@ -19,7 +19,7 @@ helpfiles in the `doc/` directory. The helpfiles are also available via
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* [GN](https://www.chromium.org/developers/gn-build-configuration) (gn)
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* HTML (js-beautify)
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* Java (google-java-format or clang-format)
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* JavaScript (clang-format)
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* JavaScript (clang-format or [prettier](https://prettier.io))
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* JSON (js-beautify)
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* Proto (clang-format)
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* Python (Autopep8 or YAPF)

‎autoload/codefmt/prettier.vim

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" Copyright 2018 Google Inc. All rights reserved.
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"
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" Licensed under the Apache License, Version 2.0 (the "License");
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" you may not use this file except in compliance with the License.
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" You may obtain a copy of the License at
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"
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" http://www.apache.org/licenses/LICENSE-2.0
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"
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" Unless required by applicable law or agreed to in writing, software
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" distributed under the License is distributed on an "AS IS" BASIS,
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" WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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" See the License for the specific language governing permissions and
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" limitations under the License.
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let s:plugin = maktaba#plugin#Get('codefmt')
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""
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" @private
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" Formatter: prettier
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function! codefmt#prettier#GetFormatter() abort
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let l:formatter = {
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\ 'name': 'prettier',
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\ 'setup_instructions': 'Install prettier (https://prettier.io/) ' .
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\ 'and configure the prettier_executable flag'}
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function l:formatter.IsAvailable() abort
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return executable(s:plugin.Flag('prettier_executable'))
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endfunction
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function l:formatter.AppliesToBuffer() abort
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return &filetype is# 'javascript'
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endfunction
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""
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" Reformat the current buffer with prettier or the binary named in
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" @flag(prettier_executable), only targeting the range between {startline} and
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" {endline}.
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function l:formatter.FormatRange(startline, endline) abort
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let l:Prettier_options = s:plugin.Flag('prettier_options')
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if type(l:Prettier_options) is# type([])
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let l:prettier_options = l:Prettier_options
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elseif maktaba#value#IsCallable(l:Prettier_options)
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let l:prettier_options = maktaba#function#Call(l:Prettier_options)
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else
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throw maktaba#error#WrongType(
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\ 'prettier_options flag must be list or callable. Found %s',
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\ string(l:Prettier_options))
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endif
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let l:cmd = [s:plugin.Flag('prettier_executable'), '--stdin', '--no-color']
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if @% == ""
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call extend(l:cmd, ['--parser', 'babylon'])
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else
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call extend(l:cmd, ['--stdin-filepath', @%])
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endif
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call maktaba#ensure#IsNumber(a:startline)
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call maktaba#ensure#IsNumber(a:endline)
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let l:lines = getline(1, line('$'))
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let l:input = join(l:lines, "\n")
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if a:startline > 1
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let l:lines_start = join(l:lines[0 : a:startline - 1], "\n")
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call extend(l:cmd, ['--range-start', string(strchars(l:lines_start))])
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endif
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let l:lines_end = join(l:lines[0 : a:endline - 1], "\n")
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call extend(l:cmd, ['--range-end', string(strchars(l:lines_end))])
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call extend(l:cmd, l:prettier_options)
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try
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let l:result = maktaba#syscall#Create(l:cmd).WithStdin(l:input).Call()
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let l:formatted = split(l:result.stdout, "\n")
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call maktaba#buffer#Overwrite(1, line('$'), l:formatted)
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catch /ERROR(ShellError):/
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" Parse all the errors and stick them in the quickfix list.
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let l:errors = []
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for l:line in split(v:exception, "\n")
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let l:tokens = matchlist(l:line,
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\ '\C\v^\[error\] stdin: (.*) \((\d+):(\d+)\).*')
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if !empty(l:tokens)
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call add(l:errors, {
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\ 'filename': @%,
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\ 'lnum': l:tokens[2],
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\ 'col': l:tokens[3],
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\ 'text': l:tokens[1]})
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endif
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endfor
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if empty(l:errors)
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" Couldn't parse prettier error format; display it all.
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call maktaba#error#Shout('Error formatting file: %s', v:exception)
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else
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call setqflist(l:errors, 'r')
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cc 1
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endif
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endtry
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endfunction
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return l:formatter
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endfunction

‎instant/flags.vim

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@@ -104,3 +104,12 @@ call s:plugin.Flag('shfmt_options', ['-i', '2', '-sr', '-ci'])
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""
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" The path to the shfmt executable.
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call s:plugin.Flag('shfmt_executable', 'shfmt')
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""
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" Command line arguments to to feed prettier. Either a list or callable that
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" takes no args and returns a list with command line arguments.
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call s:plugin.Flag('prettier_options', ['--single-quote', '--trailing-comma=all', '--arrow-parens=always', '--print-width=80'])
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""
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" The path to the prettier executable.
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call s:plugin.Flag('prettier_executable', 'prettier')

‎plugin/register.vim

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@@ -22,6 +22,7 @@ let s:registry = s:plugin.GetExtensionRegistry()
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call s:registry.SetValidator('codefmt#EnsureFormatter')
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call s:registry.AddExtension(codefmt#jsbeautify#GetFormatter())
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call s:registry.AddExtension(codefmt#prettier#GetFormatter())
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call s:registry.AddExtension(codefmt#clangformat#GetFormatter())
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call s:registry.AddExtension(codefmt#gofmt#GetFormatter())
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call s:registry.AddExtension(codefmt#dartfmt#GetFormatter())

‎vroom/prettier.vroom

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The prettier formatter knows how to format JavaScript.
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If you aren't familiar with basic codefmt usage yet, see main.vroom first.
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We'll set up codefmt and configure the vroom environment, then jump into some
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examples.
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:source $VROOMDIR/setupvroom.vim
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:let g:repeat_calls = []
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:function FakeRepeat(...)<CR>
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| call add(g:repeat_calls, a:000)<CR>
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:endfunction
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:call maktaba#test#Override('repeat#set', 'FakeRepeat')
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:call codefmt#SetWhetherToPerformIsAvailableChecksForTesting(0)
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The prettier formatter expects the prettier executable to be installed on your system.
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% function HelloWorld(){if(!greeting){return null};}
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:FormatCode prettier
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! prettier .*
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$ function HelloWorld() {
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$ if (!greeting) {
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$ return null;
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$ }
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$ }
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The name or path of the prettier executable can be configured via the
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prettier_executable flag if the default of "prettier" doesn't work.
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:Glaive codefmt prettier_executable='myprettier'
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:FormatCode prettier
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! myprettier .*
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$ function HelloWorld() {
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$ if (!greeting) {
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$ return null;
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$ }
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$ }
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:Glaive codefmt prettier_executable='prettier'
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You can format any buffer with prettier specifying the formatter explicitly.
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@clear
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% function HelloWorld(){if(!greeting){return null};}
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:FormatCode prettier
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! prettier .*2>.*
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$ function HelloWorld() {
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$ if (!greeting) {
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$ return null;
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$ }
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$ }
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function HelloWorld() {
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if (!greeting) {
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return null;
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}
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}
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@end
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Errors are reported using the quickfix list.
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@clear
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% function foo() {
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:FormatCode prettier
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! prettier .*2> (.*)
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$ echo '[error] stdin: SyntaxError: Unexpected token (2:1)' >\1 (command)
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$ echo '[error] 1 | function foo() {' >>\1 (command)
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$ echo '[error] > 2 |' >>\1 (command)
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$ echo '[error] | ^' >>\1 (command)
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$ 2 (status)
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function foo() {
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@end
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:echomsg line('.') . ',' . col('.')
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~ 1,1
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:echomsg string(map(getqflist(),
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|'v:val.lnum . "," . v:val.col . "," . v:val.text'))
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~ ['2,1,SyntaxError: Unexpected token']
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It can format specific line ranges of code using :FormatLines.
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@clear
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% function HelloWorld(){if(!greeting){return null};}<CR>
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|function Greet(){if(!greeting){return null};}
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:1,1FormatLines prettier
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! prettier .*--parser babylon --range-end 50.*2>.*
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$ function HelloWorld() {
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$ if (!greeting) {
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$ return null;
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$ }
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$ }
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$ function Greet(){if(!greeting){return null};}
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function HelloWorld() {
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if (!greeting) {
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return null;
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}
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}
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function Greet(){if(!greeting){return null};}
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@end

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