add fish_indent fixer

autoload/ale/fix/registry.vim

@@ -180,6 +180,11 @@ let s:default_registry = {
 \       'suggested_filetypes': ['cmake'],
 \       'description': 'Fix CMake files with cmake-format.',
 \   },
+\   'fish_indent': {
+\       'function': 'ale#fixers#fish_indent#Fix',
+\       'suggested_filetypes': ['fish'],
+\       'description': 'Fix fish shell scripts with fish_indent.',
+\   },
 \   'gofmt': {
 \       'function': 'ale#fixers#gofmt#Fix',
 \       'suggested_filetypes': ['go'],

autoload/ale/fixers/fish_indent.vim

@@ -0,0 +1,19 @@
+" Author: Chen YuanYuan <cyyever@outlook.com>
+" Description: Integration of fish_indent with ALE.
+
+call ale#Set('fish_indent_executable', 'fish_indent')
+call ale#Set('fish_indent_options', '')
+
+function! ale#fixers#fish_indent#Fix(buffer) abort
+    let l:executable = ale#Var(a:buffer, 'fish_indent_executable')
+    let l:options = ale#Var(a:buffer, 'fish_indent_options')
+    let l:filename = ale#Escape(bufname(a:buffer))
+
+    return {
+    \   'command': ale#Escape(l:executable)
+    \       . ' -w '
+    \       . (empty(l:options) ? '' : ' ' . l:options)
+    \       . ' %t',
+    \   'read_temporary_file': 1,
+    \}
+endfunction