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+" Author: Atsuya Takagi <asoftonight@gmail.com>
+" Description: A linter for Vala using Vala-Lint.
+
+call ale#Set('vala_vala_lint_config_filename', 'vala-lint.conf')
+call ale#Set('vala_vala_lint_executable', 'io.elementary.vala-lint')
+
+function! ale_linters#vala#vala_lint#GetExecutable(buffer) abort
+ return ale#Var(a:buffer, 'vala_vala_lint_executable')
+endfunction
+
+function! ale_linters#vala#vala_lint#GetCommand(buffer) abort
+ let l:command = ale_linters#vala#vala_lint#GetExecutable(a:buffer)
+
+ let l:config_filename = ale#Var(a:buffer, 'vala_vala_lint_config_filename')
+ let l:config_path = ale#path#FindNearestFile(a:buffer, l:config_filename)
+
+ if !empty(l:config_path)
+ let l:command .= ' -c ' . l:config_path
+ endif
+
+ return l:command . ' %s'
+endfunction
+
+function! ale_linters#vala#vala_lint#Handle(buffer, lines) abort
+ let l:pattern = '^\s*\(\d\+\)\.\(\d\+\)\s\+\(error\|warn\)\s\+\(.\+\)\s\([A-Za-z0-9_\-]\+\)'
+ let l:output = []
+
+ for l:line in a:lines
+ " remove color escape sequences since vala-lint doesn't support
+ " output without colors
+ let l:cleaned_line = substitute(l:line, '\e\[[0-9;]\+[mK]', '', 'g')
+ let l:match = matchlist(l:cleaned_line, l:pattern)
+
+ if len(l:match) == 0
+ continue
+ endif
+
+ let l:refined_type = l:match[3] is# 'warn' ? 'W' : 'E'
+ let l:cleaned_text = substitute(l:match[4], '^\s*\(.\{-}\)\s*$', '\1', '')
+
+ let l:lnum = l:match[1] + 0
+ let l:column = l:match[2] + 0
+ let l:type = l:refined_type
+ let l:text = l:cleaned_text
+ let l:code = l:match[5]
+
+ call add(l:output, {
+ \ 'lnum': l:lnum,
+ \ 'col': l:column,
+ \ 'text': l:text,
+ \ 'type': l:type,
+ \ 'code': l:code,
+ \})
+ endfor
+
+ return l:output
+endfunction
+
+call ale#linter#Define('vala', {
+\ 'name': 'vala_lint',
+\ 'output_stream': 'stdout',
+\ 'executable': function('ale_linters#vala#vala_lint#GetExecutable'),
+\ 'command': function('ale_linters#vala#vala_lint#GetCommand'),
+\ 'callback': 'ale_linters#vala#vala_lint#Handle',
+\ 'lint_file': 1,
+\})