Add shfmt fixer for sh files (#1083)

* Add shfmt fixer for sh files
* Add tests for shfmt fixer

README.md

@@ -74,8 +74,8 @@ formatting.
 | Ansible | [ansible-lint](https://github.com/willthames/ansible-lint) |
 | AsciiDoc | [proselint](http://proselint.com/), [write-good](https://github.com/btford/write-good)|
 | Awk | [gawk](https://www.gnu.org/software/gawk/)|
-| Bash | shell [-n flag](https://www.gnu.org/software/bash/manual/bash.html#index-set), [shellcheck](https://www.shellcheck.net/) |
-| Bourne Shell | shell [-n flag](http://linux.die.net/man/1/sh), [shellcheck](https://www.shellcheck.net/) |
+| Bash | shell [-n flag](https://www.gnu.org/software/bash/manual/bash.html#index-set), [shellcheck](https://www.shellcheck.net/), [shfmt](https://github.com/mvdan/sh) |
+| Bourne Shell | shell [-n flag](http://linux.die.net/man/1/sh), [shellcheck](https://www.shellcheck.net/), [shfmt](https://github.com/mvdan/sh) |
 | C | [cppcheck](http://cppcheck.sourceforge.net), [cpplint](https://github.com/google/styleguide/tree/gh-pages/cpplint), [gcc](https://gcc.gnu.org/), [clang](http://clang.llvm.org/), [clangtidy](http://clang.llvm.org/extra/clang-tidy/) !!, [clang-format](https://clang.llvm.org/docs/ClangFormat.html)|
 | C++ (filetype cpp) | [clang](http://clang.llvm.org/), [clangcheck](http://clang.llvm.org/docs/ClangCheck.html) !!, [clangtidy](http://clang.llvm.org/extra/clang-tidy/) !!, [cppcheck](http://cppcheck.sourceforge.net), [cpplint](https://github.com/google/styleguide/tree/gh-pages/cpplint) !!, [gcc](https://gcc.gnu.org/), [clang-format](https://clang.llvm.org/docs/ClangFormat.html)|
 | CUDA | [nvcc](http://docs.nvidia.com/cuda/cuda-compiler-driver-nvcc/index.html) |

autoload/ale/fix/registry.vim

@@ -132,6 +132,11 @@ let s:default_registry = {
 \       'suggested_filetypes': ['reason'],
 \       'description': 'Fix ReasonML files with refmt.',
 \   },
+\   'shfmt': {
+\       'function': 'ale#fixers#shfmt#Fix',
+\       'suggested_filetypes': ['sh'],
+\       'description': 'Fix sh files with shfmt.',
+\   },
 \}
 
 " Reset the function registry to the default entries.

autoload/ale/fixers/shfmt.vim

@@ -0,0 +1,17 @@
+scriptencoding utf-8
+" Author: Simon Bugert <simon.bugert@gmail.com>
+" Description: Fix sh files with shfmt.
+
+call ale#Set('sh_shfmt_executable', 'shfmt')
+call ale#Set('sh_shfmt_options', '')
+
+function! ale#fixers#shfmt#Fix(buffer) abort
+    let l:executable = ale#Var(a:buffer, 'sh_shfmt_executable')
+    let l:options = ale#Var(a:buffer, 'sh_shfmt_options')
+
+    return {
+    \   'command': ale#Escape(l:executable)
+    \       . (empty(l:options) ? '' : ' ' . l:options)
+    \}
+
+endfunction

doc/ale-sh.txt

@@ -57,5 +57,16 @@ g:ale_sh_shellcheck_exclusions                 *g:ale_sh_shellcheck_exclusions*
     \   let b:ale_sh_shellcheck_exclusions = 'SC2034,SC2154,SC2164'
 <
 
+===============================================================================
+shfmt                                                            *ale-sh-shfmt*
+
+g:ale_sh_shfmt_options                                 *g:ale_sh_shfmt_options*
+                                                       *b:ale_sh_shfmt_options*
+  Type: |String|
+  Default: `''`
+
+  This variable can be set to pass additional options to the shfmt fixer.
+
+
 ===============================================================================
   vim:tw=78:ts=2:sts=2:sw=2:ft=help:norl:

doc/ale.txt

@@ -173,6 +173,7 @@ CONTENTS                                                         *ale-contents*
     sh....................................|ale-sh-options|
       shell...............................|ale-sh-shell|
       shellcheck..........................|ale-sh-shellcheck|
+      shfmt...............................|ale-sh-shfmt|
     sml...................................|ale-sml-options|
       smlnj...............................|ale-sml-smlnj|
     solidity..............................|ale-solidity-options|
@@ -256,8 +257,8 @@ Notes:
 * Ansible: `ansible-lint`
 * AsciiDoc: `proselint`, `write-good`
 * Awk: `gawk`
-* Bash: `shell` (-n flag), `shellcheck`
-* Bourne Shell: `shell` (-n flag), `shellcheck`
+* Bash: `shell` (-n flag), `shellcheck`, `shfmt`
+* Bourne Shell: `shell` (-n flag), `shellcheck`, `shfmt`
 * C: `cppcheck`, `cpplint`!!, `gcc`, `clang`, `clangtidy`!!, `clang-format`
 * C++ (filetype cpp): `clang`, `clangcheck`!!, `clangtidy`!!, `cppcheck`, `cpplint`!!, `gcc`, `clang-format`
 * CUDA: `nvcc`!!

test/fixers/test_shfmt_fixer_callback.vader

@@ -0,0 +1,24 @@
+Before:
+  Save g:ale_sh_shfmt_executable
+  Save g:ale_sh_shfmt_options
+
+  " Use an invalid global executable, so we don't match it.
+  let g:ale_sh_shfmt_executable = 'xxxinvalid'
+  let g:ale_sh_shfmt_options = ''
+
+Execute(The shfmt callback should return the correct default values):
+  AssertEqual
+  \ {
+  \   'command': ale#Escape('xxxinvalid'),
+  \ },
+  \ ale#fixers#shfmt#Fix(bufnr(''))
+
+Execute(The shfmt callback should include custom shfmt options):
+  let g:ale_sh_shfmt_options = '--some-option'
+
+  AssertEqual
+  \ {
+  \   'command': ale#Escape(g:ale_sh_shfmt_executable)
+  \     . ' --some-option',
+  \ },
+  \ ale#fixers#shfmt#Fix(bufnr(''))