Add support for V: "v" (compiler) and "vfmt" fixer. (#3622)

* v: add "v fmt" fixer.

* v: add "v" (build) linter.

* v: fix vlint complaints and add documentation.

* v: add tests.

* v: use ale#Pad().

1 files changed, 82 insertions, 0 deletions

diff --git a/ale_linters/v/v.vim b/ale_linters/v/v.vim
new file mode 100644
index 00000000..afa98c56
--- /dev/null
+++ b/ale_linters/v/v.vim
@@ -0,0 +1,82 @@
+" Author: fiatjaf <fiatjaf@alhur.es>
+" Description: v build for V files
+
+call ale#Set('v_v_executable', 'v')
+call ale#Set('v_v_options', '')
+
+function! ale_linters#v#v#GetCommand(buffer) abort
+    let l:options = ale#Var(a:buffer, 'v_v_options')
+
+    " Run v in local directory with relative path
+    let l:command = ale#Var(a:buffer, 'v_v_executable')
+    \   . ale#Pad(l:options)
+    \   . ' .' . ' -o /tmp/vim-ale-v'
+
+    return l:command
+endfunction
+
+function! ale_linters#v#v#Handler(buffer, lines) abort
+    let l:dir = expand('#' . a:buffer . ':p:h')
+    let l:output = []
+
+    " Matches patterns like the following:
+    "
+    " ./const.v:4:3: warning: const names cannot contain uppercase letters, use snake_case instead
+    "     2 |
+    "     3 | const (
+    "     4 |   BUTTON_TEXT = 'OK'
+    "       |   ~~~~~~~~~~~
+    "     5 | )
+    " ./main.v:4:8: warning: module 'os' is imported but never used
+    "     2 |
+    "     3 | import ui
+    "     4 | import os
+    "       |        ~~
+    "     5 |
+    "     6 | const (
+    " ./main.v:20:10: error: undefined ident: `win_widt`
+    "    18 |     mut app := &App{}
+    "    19 |     app.window = ui.window({
+    "    20 |         width: win_widt
+    "       |                ~~~~~~~~
+    "    21 |         height: win_height
+    "    22 |         title: 'Counter'
+    let l:current = {}
+
+    for l:line in a:lines
+        " matches basic error description
+        let l:match = matchlist(l:line,
+        \ '\([^:]\+\):\([^:]\+\):\([^:]\+\): \([^:]\+\): \(.*\)')
+
+        if !empty(l:match)
+            let l:current = {
+            \   'filename': ale#path#GetAbsPath(l:dir, l:match[1]),
+            \   'lnum': l:match[2] + 0,
+            \   'col': l:match[3] + 0,
+            \   'text': l:match[5],
+            \   'type': l:match[4] is# 'error' ? 'E' : 'W',
+            \}
+            call add(l:output, l:current)
+            continue
+        endif
+
+        " try to get information about the ending column
+        let l:tildematch = matchstr(l:line, '\~\+')
+
+        if !empty(l:tildematch)
+            let l:current['end_col'] = l:current['col'] + len(l:tildematch)
+        endif
+    endfor
+
+    return l:output
+endfunction
+
+call ale#linter#Define('v', {
+\   'name': 'v',
+\   'aliases': [],
+\   'executable': {b -> ale#Var(b, 'v_v_executable')},
+\   'command': function('ale_linters#v#v#GetCommand'),
+\   'output_stream': 'stderr',
+\   'callback': 'ale_linters#v#v#Handler',
+\   'lint_file': 1,
+\})