Add kotlinc checker for kotlin (#526)

* Add kotlinc checker for kotlin

1 files changed, 116 insertions, 0 deletions

diff --git a/ale_linters/kotlin/kotlinc.vim b/ale_linters/kotlin/kotlinc.vim
new file mode 100644
index 00000000..0ada361f
--- /dev/null
+++ b/ale_linters/kotlin/kotlinc.vim
@@ -0,0 +1,116 @@
+" 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')
+
+function! ale_linters#kotlin#kotlinc#GetCommand(buffer) 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')
+        if filereadable(expand(ale#Var(a:buffer, 'kotlin_kotlinc_config_file'), 1))
+            execute 'source ' . fnameescape(expand(ale#Var(a:buffer, 'kotlin_kotlinc_config_file'), 1))
+        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 = fnameescape(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') !=# ''
+        let l:kotlinc_opts .= ' -cp ' . ale#Var(a:buffer, 'kotlin_kotlinc_classpath')
+    endif
+
+    let l:fname = ''
+
+    if ale#Var(a:buffer, 'kotlin_kotlinc_sourcepath') !=# ''
+        let l:fname .= expand(ale#Var(a:buffer, 'kotlin_kotlinc_sourcepath'), 1) . ' '
+    endif
+    let l:fname .= shellescape(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 !=# l:curbuf_abspath
+            continue
+        endif
+        let l:type_marker_str = l:type ==# '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 ==# 'warning' || l:type ==# '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',
+\   'output_stream': 'stderr',
+\   'executable': 'kotlinc',
+\   'command_callback': 'ale_linters#kotlin#kotlinc#GetCommand',
+\   'callback': 'ale_linters#kotlin#kotlinc#Handle',
+\   'lint_file': 1,
+\})