Add 'prettier' fixer support to TypeScript, CSS, SCSS and JSON (#910)

* Add prettier fixer support for typescript

* Add prettier fixer support for css and scss

* Add prettier fixer support for json

* Use getbufvar() to get &filetype

13 files changed, 126 insertions, 10 deletions

diff --git a/README.md b/README.md
index 863815f9..ee5c156e 100644
--- a/README.md
+++ b/README.md
@@ -80,7 +80,7 @@ formatting.
 | CMake | [cmakelint](https://github.com/richq/cmake-lint) |
 | CoffeeScript | [coffee](http://coffeescript.org/), [coffeelint](https://www.npmjs.com/package/coffeelint) |
 | Crystal | [crystal](https://crystal-lang.org/) !! |
-| CSS | [csslint](http://csslint.net/), [stylelint](https://github.com/stylelint/stylelint) |
+| CSS | [csslint](http://csslint.net/), [stylelint](https://github.com/stylelint/stylelint), [prettier](https://github.com/prettier/prettier) |
 | Cython (pyrex filetype) | [cython](http://cython.org/) |
 | D | [dmd](https://dlang.org/dmd-linux.html) |
 | Dart | [dartanalyzer](https://github.com/dart-lang/sdk/tree/master/pkg/analyzer_cli) |
@@ -100,7 +100,7 @@ formatting.
 | Idris | [idris](http://www.idris-lang.org/) |
 | Java | [checkstyle](http://checkstyle.sourceforge.net), [javac](http://www.oracle.com/technetwork/java/javase/downloads/index.html) |
 | JavaScript | [eslint](http://eslint.org/), [jscs](http://jscs.info/), [jshint](http://jshint.com/), [flow](https://flowtype.org/), [prettier](https://github.com/prettier/prettier), prettier-eslint >= 4.2.0, prettier-standard, [standard](http://standardjs.com/), [xo](https://github.com/sindresorhus/xo)
-| JSON | [jsonlint](http://zaa.ch/jsonlint/) |
+| JSON | [jsonlint](http://zaa.ch/jsonlint/), [prettier](https://github.com/prettier/prettier) |
 | Kotlin | [kotlinc](https://kotlinlang.org) !!, [ktlint](https://ktlint.github.io) !! see `:help ale-integration-kotlin` for configuration instructions
 | LaTeX | [chktex](http://www.nongnu.org/chktex/), [lacheck](https://www.ctan.org/pkg/lacheck), [proselint](http://proselint.com/) |
 | Lua | [luacheck](https://github.com/mpeterv/luacheck) |
@@ -125,7 +125,7 @@ formatting.
 | Ruby | [brakeman](http://brakemanscanner.org/) !!, [rails_best_practices](https://github.com/flyerhzm/rails_best_practices) !!, [reek](https://github.com/troessner/reek), [rubocop](https://github.com/bbatsov/rubocop), [ruby](https://www.ruby-lang.org) |
 | Rust |  cargo !! (see `:help ale-integration-rust` for configuration instructions), [rls](https://github.com/rust-lang-nursery/rls), [rustc](https://www.rust-lang.org/) |
 | SASS | [sass-lint](https://www.npmjs.com/package/sass-lint), [stylelint](https://github.com/stylelint/stylelint) |
-| SCSS | [sass-lint](https://www.npmjs.com/package/sass-lint), [scss-lint](https://github.com/brigade/scss-lint), [stylelint](https://github.com/stylelint/stylelint) |
+| SCSS | [sass-lint](https://www.npmjs.com/package/sass-lint), [scss-lint](https://github.com/brigade/scss-lint), [stylelint](https://github.com/stylelint/stylelint), [prettier](https://github.com/prettier/prettier) |
 | Scala | [scalac](http://scala-lang.org), [scalastyle](http://www.scalastyle.org) |
 | Slim | [slim-lint](https://github.com/sds/slim-lint)
 | SML | [smlnj](http://www.smlnj.org/) |
@@ -136,7 +136,7 @@ formatting.
 | Texinfo | [proselint](http://proselint.com/)|
 | Text^ | [proselint](http://proselint.com/), [vale](https://github.com/ValeLint/vale) |
 | Thrift | [thrift](http://thrift.apache.org/) |
-| TypeScript | [eslint](http://eslint.org/), [tslint](https://github.com/palantir/tslint), tsserver, typecheck |
+| TypeScript | [eslint](http://eslint.org/), [tslint](https://github.com/palantir/tslint), tsserver, typecheck, [prettier](https://github.com/prettier/prettier) |
 | Verilog | [iverilog](https://github.com/steveicarus/iverilog), [verilator](http://www.veripool.org/projects/verilator/wiki/Intro) |
 | Vim | [vint](https://github.com/Kuniwak/vint) |
 | Vim help^ | [proselint](http://proselint.com/)|
diff --git a/autoload/ale/fix/registry.vim b/autoload/ale/fix/registry.vim
index b77ac031..5b1030d9 100644
--- a/autoload/ale/fix/registry.vim
+++ b/autoload/ale/fix/registry.vim
@@ -34,7 +34,7 @@ let s:default_registry = {
 \   },
 \   'prettier': {
 \       'function': 'ale#fixers#prettier#Fix',
-\       'suggested_filetypes': ['javascript'],
+\       'suggested_filetypes': ['javascript', 'typescript', 'json', 'css', 'scss'],
 \       'description': 'Apply prettier to a file.',
 \   },
 \   'prettier_eslint': {
diff --git a/autoload/ale/fixers/prettier.vim b/autoload/ale/fixers/prettier.vim
index 581536e6..ca1bf608 100644
--- a/autoload/ale/fixers/prettier.vim
+++ b/autoload/ale/fixers/prettier.vim
@@ -38,6 +38,22 @@ function! ale#fixers#prettier#Fix(buffer) abort
     let l:config = s:FindConfig(a:buffer)
     let l:use_config = ale#Var(a:buffer, 'javascript_prettier_use_local_config')
                 \ && !empty(l:config)
+    let l:filetype = getbufvar(a:buffer, '&filetype')
+
+    " Append the --parser flag depending on the current filetype (unless it's
+    " already set in g:javascript_prettier_options).
+    if match(l:options, '--parser') == -1
+        if l:filetype is# 'typescript'
+            let l:parser = 'typescript'
+        elseif l:filetype =~# 'css\|scss'
+            let l:parser = 'postcss'
+        elseif l:filetype is# 'json'
+            let l:parser = 'json'
+        else
+            let l:parser = 'babylon'
+        endif
+        let l:options = (!empty(l:options) ? l:options . ' ' : '') . '--parser ' . l:parser
+    endif
 
     return {
     \   'command': ale#Escape(ale#fixers#prettier#GetExecutable(a:buffer))
diff --git a/doc/ale-css.txt b/doc/ale-css.txt
index b1ab8eb8..979be881 100644
--- a/doc/ale-css.txt
+++ b/doc/ale-css.txt
@@ -30,4 +30,10 @@ g:ale_css_stylelint_use_global                 *g:ale_css_stylelint_use_global*
 
 
 ===============================================================================
+prettier                                                     *ale-css-prettier*
+
+See |ale-javascript-prettier| for information about the available options.
+
+
+===============================================================================
   vim:tw=78:ts=2:sts=2:sw=2:ft=help:norl:
diff --git a/doc/ale-json.txt b/doc/ale-json.txt
new file mode 100644
index 00000000..1d052d55
--- /dev/null
+++ b/doc/ale-json.txt
@@ -0,0 +1,18 @@
+===============================================================================
+ALE JSON Integration                                         *ale-json-options*
+
+
+===============================================================================
+jsonlint                                                    *ale-json-jsonlint*
+
+There are no options available.
+
+
+===============================================================================
+prettier                                                    *ale-json-prettier*
+
+See |ale-javascript-prettier| for information about the available options.
+
+
+===============================================================================
+  vim:tw=78:ts=2:sts=2:sw=2:ft=help:norl:
diff --git a/doc/ale-scss.txt b/doc/ale-scss.txt
index c7b79195..e0b0a11d 100644
--- a/doc/ale-scss.txt
+++ b/doc/ale-scss.txt
@@ -22,4 +22,10 @@ g:ale_scss_stylelint_use_global               *g:ale_scss_stylelint_use_global*
 
 
 ===============================================================================
+prettier                                                    *ale-scss-prettier*
+
+See |ale-javascript-prettier| for information about the available options.
+
+
+===============================================================================
   vim:tw=78:ts=2:sts=2:sw=2:ft=help:norl:
diff --git a/doc/ale-typescript.txt b/doc/ale-typescript.txt
index 949b80de..887766fe 100644
--- a/doc/ale-typescript.txt
+++ b/doc/ale-typescript.txt
@@ -94,4 +94,10 @@ g:ale_typescript_tsserver_use_global     *g:ale_typescript_tsserver_use_global*
 
 
 ===============================================================================
+prettier                                              *ale-typescript-prettier*
+
+See |ale-javascript-prettier| for information about the available options.
+
+
+===============================================================================
   vim:tw=78:ts=2:sts=2:sw=2:ft=help:norl:
diff --git a/doc/ale.txt b/doc/ale.txt
index 899e8c80..3c02af37 100644
--- a/doc/ale.txt
+++ b/doc/ale.txt
@@ -33,6 +33,7 @@ CONTENTS                                                         *ale-contents*
       gcc.................................|ale-cpp-gcc|
       clang-format........................|ale-cpp-clangformat|
     css...................................|ale-css-options|
+      prettier............................|ale-css-prettier|
       stylelint...........................|ale-css-stylelint|
     cmake.................................|ale-cmake-options|
       cmakelint...........................|ale-cmake-cmakelint|
@@ -71,6 +72,9 @@ CONTENTS                                                         *ale-contents*
       prettier-standard...................|ale-javascript-prettier-standard|
       standard............................|ale-javascript-standard|
       xo..................................|ale-javascript-xo|
+    json..................................|ale-json-options|
+      jsonlint............................|ale-json-jsonlint|
+      prettier............................|ale-json-prettier|
     kotlin................................|ale-kotlin-options|
       kotlinc.............................|ale-kotlin-kotlinc|
     lua...................................|ale-lua-options|
@@ -117,6 +121,7 @@ CONTENTS                                                         *ale-contents*
     scala.................................|ale-scala-options|
       scalastyle..........................|ale-scala-scalastyle|
     scss..................................|ale-scss-options|
+      prettier............................|ale-scss-prettier|
       stylelint...........................|ale-scss-stylelint|
     sh....................................|ale-sh-options|
       shell...............................|ale-sh-shell|
@@ -136,6 +141,7 @@ CONTENTS                                                         *ale-contents*
       thrift..............................|ale-thrift-thrift|
     typescript............................|ale-typescript-options|
       eslint..............................|ale-typescript-eslint|
+      prettier............................|ale-typescript-prettier|
       tslint..............................|ale-typescript-tslint|
       tsserver............................|ale-typescript-tsserver|
     verilog/systemverilog.................|ale-verilog-options|
@@ -200,7 +206,7 @@ Notes:
 * CMake: `cmakelint`
 * CoffeeScript: `coffee`, `coffeelint`
 * Crystal: `crystal`!!
-* CSS: `csslint`, `stylelint`
+* CSS: `csslint`, `stylelint`, `prettier`
 * Cython (pyrex filetype): `cython`
 * D: `dmd`
 * Dart: `dartanalyzer`
@@ -220,7 +226,7 @@ Notes:
 * Idris: `idris`
 * Java: `checkstyle`, `javac`
 * JavaScript: `eslint`, `jscs`, `jshint`, `flow`, `prettier`, `prettier-eslint` >= 4.2.0, `prettier-standard`, `standard`, `xo`
-* JSON: `jsonlint`
+* JSON: `jsonlint`, `prettier`
 * Kotlin: `kotlinc`, `ktlint`
 * LaTeX (tex): `chktex`, `lacheck`, `proselint`
 * Lua: `luacheck`
@@ -245,7 +251,7 @@ Notes:
 * Ruby: `brakeman`, `rails_best_practices`!!, `reek`, `rubocop`, `ruby`
 * Rust: `cargo`!!, `rls`, `rustc` (see |ale-integration-rust|)
 * SASS: `sass-lint`, `stylelint`
-* SCSS: `sass-lint`, `scss-lint`, `stylelint`
+* SCSS: `sass-lint`, `scss-lint`, `stylelint`, `prettier`
 * Scala: `scalac`, `scalastyle`
 * Slim: `slim-lint`
 * SML: `smlnj`
@@ -256,7 +262,7 @@ Notes:
 * Texinfo: `proselint`
 * Text^: `proselint`, `vale`
 * Thrift: `thrift`
-* TypeScript: `eslint`, `tslint`, `tsserver`, `typecheck`
+* TypeScript: `eslint`, `tslint`, `tsserver`, `typecheck`, `prettier`
 * Verilog: `iverilog`, `verilator`
 * Vim: `vint`
 * Vim help^: `proselint`
diff --git a/test/fixers/test_prettier_fixer_callback.vader b/test/fixers/test_prettier_fixer_callback.vader
index 1eb24dae..a684ad02 100644
--- a/test/fixers/test_prettier_fixer_callback.vader
+++ b/test/fixers/test_prettier_fixer_callback.vader
@@ -24,6 +24,7 @@ Execute(The prettier callback should return the correct default values):
   \   'read_temporary_file': 1,
   \   'command': ale#Escape(g:ale_javascript_prettier_executable)
   \     . ' %t'
+  \     . ' --parser babylon'
   \     . ' --write',
   \ },
   \ ale#fixers#prettier#Fix(bufnr(''))
@@ -37,6 +38,7 @@ Execute(The prettier callback should include configuration files when the option
   \   'read_temporary_file': 1,
   \   'command': ale#Escape(g:ale_javascript_prettier_executable)
   \     . ' %t'
+  \     . ' --parser babylon'
   \     . ' --config ' . ale#Escape(simplify(g:dir .  '/../prettier-test-files/with_config/.prettierrc'))
   \     . ' --write',
   \ },
@@ -51,8 +53,64 @@ Execute(The prettier callback should include custom prettier options):
   \   'read_temporary_file': 1,
   \   'command': ale#Escape(g:ale_javascript_prettier_executable)
   \     . ' %t'
-  \     . ' --no-semi'
+  \     . ' --no-semi --parser babylon'
   \     . ' --config ' . ale#Escape(simplify(g:dir .  '/../prettier-test-files/with_config/.prettierrc'))
   \     . ' --write',
   \ },
   \ ale#fixers#prettier#Fix(bufnr(''))
+
+Execute(Append '--parser typescript' for filetype=typescript):
+  set filetype=typescript
+  call ale#test#SetFilename('../prettier-test-files/testfile.ts')
+
+  AssertEqual
+  \ {
+  \   'read_temporary_file': 1,
+  \   'command': ale#Escape(g:ale_javascript_prettier_executable)
+  \     . ' %t'
+  \     . ' --parser typescript'
+  \     . ' --write',
+  \ },
+  \ ale#fixers#prettier#Fix(bufnr(''))
+
+Execute(Append '--parser json' for filetype=json):
+  set filetype=json
+  call ale#test#SetFilename('../prettier-test-files/testfile.json')
+
+  AssertEqual
+  \ {
+  \   'read_temporary_file': 1,
+  \   'command': ale#Escape(g:ale_javascript_prettier_executable)
+  \     . ' %t'
+  \     . ' --parser json'
+  \     . ' --write',
+  \ },
+  \ ale#fixers#prettier#Fix(bufnr(''))
+
+Execute(Append '--parser postcss' for filetype=scss):
+  set filetype=scss
+  call ale#test#SetFilename('../prettier-test-files/testfile.scss')
+
+  AssertEqual
+  \ {
+  \   'read_temporary_file': 1,
+  \   'command': ale#Escape(g:ale_javascript_prettier_executable)
+  \     . ' %t'
+  \     . ' --parser postcss'
+  \     . ' --write',
+  \ },
+  \ ale#fixers#prettier#Fix(bufnr(''))
+
+Execute(Append '--parser postcss' for filetype=css):
+  set filetype=css
+  call ale#test#SetFilename('../prettier-test-files/testfile.css')
+
+  AssertEqual
+  \ {
+  \   'read_temporary_file': 1,
+  \   'command': ale#Escape(g:ale_javascript_prettier_executable)
+  \     . ' %t'
+  \     . ' --parser postcss'
+  \     . ' --write',
+  \ },
+  \ ale#fixers#prettier#Fix(bufnr(''))
diff --git a/test/prettier-test-files/testfile.css b/test/prettier-test-files/testfile.css
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/test/prettier-test-files/testfile.css
diff --git a/test/prettier-test-files/testfile.json b/test/prettier-test-files/testfile.json
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/test/prettier-test-files/testfile.json
diff --git a/test/prettier-test-files/testfile.scss b/test/prettier-test-files/testfile.scss
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/test/prettier-test-files/testfile.scss
diff --git a/test/prettier-test-files/testfile.ts b/test/prettier-test-files/testfile.ts
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/test/prettier-test-files/testfile.ts