Merge pull request #2228 from Nomad145/ktlint

Add ktlint Fixer Support

autoload/ale/fix/registry.vim

@@ -275,6 +275,11 @@ let s:default_registry = {
 \       'suggested_filetypes': ['hcl', 'terraform'],
 \       'description': 'Fix tf and hcl files with terraform fmt.',
 \   },
+\   'ktlint': {
+\       'function': 'ale#fixers#ktlint#Fix',
+\       'suggested_filetypes': ['kt'],
+\       'description': 'Fix Kotlin files with ktlint.',
+\   },
 \}
 
 " Reset the function registry to the default entries.

autoload/ale/fixers/ktlint.vim

@@ -0,0 +1,9 @@
+" Author: Michael Phillips <michaeljoelphillips@gmail.com>
+" Description: Fix Kotlin files with ktlint.
+
+function! ale#fixers#ktlint#Fix(buffer) abort
+    return {
+    \   'command': ale#handlers#ktlint#GetCommand(a:buffer) . ' --format',
+    \   'read_temporary_file': 1,
+    \}
+endfunction

autoload/ale/handlers/ktlint.vim

@@ -0,0 +1,45 @@
+" Author: Michael Phillips <michaeljoelphillips@gmail.com>
+" Description: Handler functions for ktlint.
+
+call ale#Set('kotlin_ktlint_executable', 'ktlint')
+call ale#Set('kotlin_ktlint_rulesets', [])
+call ale#Set('kotlin_ktlint_options', '')
+
+function! ale#handlers#ktlint#GetCommand(buffer) abort
+    let l:executable = ale#Var(a:buffer, 'kotlin_ktlint_executable')
+    let l:options = ale#Var(a:buffer, 'kotlin_ktlint_options')
+    let l:rulesets = ale#handlers#ktlint#GetRulesets(a:buffer)
+
+    return ale#Escape(l:executable)
+    \   . (empty(l:options) ? '' : ' ' . l:options)
+    \   . (empty(l:rulesets) ? '' : ' ' . l:rulesets)
+    \   . ' %t'
+endfunction
+
+function! ale#handlers#ktlint#GetRulesets(buffer) abort
+    let l:rulesets = map(ale#Var(a:buffer, 'kotlin_ktlint_rulesets'), '''--ruleset '' . v:val')
+
+    return join(l:rulesets, ' ')
+endfunction
+
+function! ale#handlers#ktlint#Handle(buffer, lines) abort
+    let l:message_pattern = '^\(.*\):\([0-9]\+\):\([0-9]\+\):\s\+\(.*\)'
+    let l:output = []
+
+    for l:match in ale#util#GetMatches(a:lines, l:message_pattern)
+        let l:line = l:match[2] + 0
+        let l:column = l:match[3] + 0
+        let l:text = l:match[4]
+
+        let l:type = l:text =~? 'not a valid kotlin file' ? 'E' : 'W'
+
+        call add(l:output, {
+        \   'lnum': l:line,
+        \   'col': l:column,
+        \   'text': l:text,
+        \   'type': l:type
+        \})
+    endfor
+
+    return l:output
+endfunction