+" Author: Francis Agyapong <francisgyapong2@gmail.com>
+" Description: A linter for the Kotlin programming language that uses kotlinc
+
+let g:ale_kotlin_kotlinc_options = get(g:, 'ale_kotlin_kotlinc_options', '')
+let g:ale_kotlin_kotlinc_enable_config = get(g:, 'ale_kotlin_kotlinc_enable_config', 0)
+let g:ale_kotlin_kotlinc_config_file = get(g:, 'ale_kotlin_kotlinc_config_file', '.ale_kotlinc_config')
+let g:ale_kotlin_kotlinc_classpath = get(g:, 'ale_kotlin_kotlinc_classpath', '')
+let g:ale_kotlin_kotlinc_sourcepath = get(g:, 'ale_kotlin_kotlinc_sourcepath', '')
+let g:ale_kotlin_kotlinc_use_module_file = get(g:, 'ale_kotlin_kotlinc_use_module_file', 0)
+let g:ale_kotlin_kotlinc_module_filename = get(g:, 'ale_kotlin_kotlinc_module_filename', 'module.xml')
+
+let s:classpath_sep = has('unix') ? ':' : ';'
+
+function! ale_linters#kotlin#kotlinc#RunWithImportPaths(buffer) abort
+ let l:command = ''
+
+ " exec maven/gradle only if classpath is not set
+ if !empty(ale#Var(a:buffer, 'kotlin_kotlinc_classpath'))
+ return ale_linters#kotlin#kotlinc#GetCommand(a:buffer, [], {})
+ endif
+
+ let [l:cwd, l:command] = ale#maven#BuildClasspathCommand(a:buffer)
+
+ " Try to use Gradle if Maven isn't available.
+ if empty(l:command)
+ let [l:cwd, l:command] = ale#gradle#BuildClasspathCommand(a:buffer)
+ endif
+
+ if empty(l:command)
+ return ale_linters#kotlin#kotlinc#GetCommand(a:buffer, [], {})
+ endif
+
+ return ale#command#Run(
+ \ a:buffer,
+ \ l:command,
+ \ function('ale_linters#kotlin#kotlinc#GetCommand'),
+ \ {'cwd': l:cwd},
+ \)
+endfunction
+
+function! s:BuildClassPathOption(buffer, import_paths) abort
+ " Filter out lines like [INFO], etc.
+ let l:class_paths = filter(a:import_paths[:], 'v:val !~# ''[''')
+ call extend(
+ \ l:class_paths,
+ \ split(ale#Var(a:buffer, 'kotlin_kotlinc_classpath'), s:classpath_sep),
+ \)
+
+ return !empty(l:class_paths)
+ \ ? ' -cp ' . ale#Escape(join(l:class_paths, s:classpath_sep))
+ \ : ''
+endfunction
+
+function! ale_linters#kotlin#kotlinc#GetCommand(buffer, import_paths, meta) abort
+ let l:kotlinc_opts = ale#Var(a:buffer, 'kotlin_kotlinc_options')
+ let l:command = 'kotlinc '
+
+ " If the config file is enabled and readable, source it
+ if ale#Var(a:buffer, 'kotlin_kotlinc_enable_config')
+ let l:conf = expand(ale#Var(a:buffer, 'kotlin_kotlinc_config_file'), 1)
+
+ if filereadable(l:conf)
+ execute 'source ' . fnameescape(l:conf)
+ endif
+ endif
+
+ " If use module and module file is readable use that and return
+ if ale#Var(a:buffer, 'kotlin_kotlinc_use_module_file')
+ let l:module_filename = ale#Escape(expand(ale#Var(a:buffer, 'kotlin_kotlinc_module_filename'), 1))
+
+ if filereadable(l:module_filename)
+ let l:kotlinc_opts .= ' -module ' . l:module_filename
+ let l:command .= 'kotlinc ' . l:kotlinc_opts
+
+ return l:command
+ endif
+ endif
+
+ " We only get here if not using module or the module file not readable
+ if ale#Var(a:buffer, 'kotlin_kotlinc_classpath') isnot# ''
+ let l:kotlinc_opts .= ' -cp ' . ale#Var(a:buffer, 'kotlin_kotlinc_classpath')
+ else
+ " get classpath from maven/gradle
+ let l:kotlinc_opts .= s:BuildClassPathOption(a:buffer, a:import_paths)
+ endif
+
+ let l:fname = ''
+
+ if ale#Var(a:buffer, 'kotlin_kotlinc_sourcepath') isnot# ''
+ let l:fname .= expand(ale#Var(a:buffer, 'kotlin_kotlinc_sourcepath'), 1) . ' '
+ else
+ " Find the src directory for files in this project.
+ let l:project_root = ale#gradle#FindProjectRoot(a:buffer)
+
+ if !empty(l:project_root)
+ let l:src_dir = l:project_root
+ else
+ let l:src_dir = ale#path#FindNearestDirectory(a:buffer, 'src/main/java')
+ \ . ' ' . ale#path#FindNearestDirectory(a:buffer, 'src/main/kotlin')
+ endif
+
+ let l:fname .= expand(l:src_dir, 1) . ' '
+ endif
+
+ let l:fname .= ale#Escape(expand('#' . a:buffer . ':p'))
+ let l:command .= l:kotlinc_opts . ' ' . l:fname
+
+ return l:command
+endfunction
+
+function! ale_linters#kotlin#kotlinc#Handle(buffer, lines) abort
+ let l:code_pattern = '^\(.*\):\([0-9]\+\):\([0-9]\+\):\s\+\(error\|warning\):\s\+\(.*\)'
+ let l:general_pattern = '^\(warning\|error\|info\):\s*\(.*\)'
+ let l:output = []
+
+ for l:line in a:lines
+ let l:match = matchlist(l:line, l:code_pattern)
+
+ if len(l:match) == 0
+ continue
+ endif
+
+ let l:file = l:match[1]
+ let l:line = l:match[2] + 0
+ let l:column = l:match[3] + 0
+ let l:type = l:match[4]
+ let l:text = l:match[5]
+
+ let l:buf_abspath = fnamemodify(l:file, ':p')
+ let l:curbuf_abspath = expand('#' . a:buffer . ':p')
+
+ " Skip if file is not loaded
+ if l:buf_abspath isnot# l:curbuf_abspath
+ continue
+ endif
+
+ let l:type_marker_str = l:type is# 'warning' ? 'W' : 'E'
+
+ call add(l:output, {
+ \ 'lnum': l:line,
+ \ 'col': l:column,
+ \ 'text': l:text,
+ \ 'type': l:type_marker_str,
+ \})
+ endfor
+
+ " Non-code related messages
+ for l:line in a:lines
+ let l:match = matchlist(l:line, l:general_pattern)
+
+ if len(l:match) == 0
+ continue
+ endif
+
+ let l:type = l:match[1]
+ let l:text = l:match[2]
+
+ let l:type_marker_str = l:type is# 'warning' || l:type is# 'info' ? 'W' : 'E'
+
+ call add(l:output, {
+ \ 'lnum': 1,
+ \ 'text': l:text,
+ \ 'type': l:type_marker_str,
+ \})
+ endfor
+
+ return l:output
+endfunction
+
+call ale#linter#Define('kotlin', {
+\ 'name': 'kotlinc',
+\ 'executable': 'kotlinc',
+\ 'output_stream': 'stderr',
+\ 'command': function('ale_linters#kotlin#kotlinc#RunWithImportPaths'),
+\ 'callback': 'ale_linters#kotlin#kotlinc#Handle',
+\ 'lint_file': 1,
+\})