Fix #1373 - Fix a bug with Fish errors not being handled on Linux

ale_linters/fish/fish.vim

@@ -7,22 +7,53 @@ function! ale_linters#fish#fish#Handle(buffer, lines) abort
     " home/.config/fish/functions/foo.fish (line 1): Missing end to balance this function definition
     " function foo
     " ^
-    " <W> fish: Error while reading file .config/fish/functions/foo.fish
-    let l:pattern = '^.* (line \(\d\+\)): \(.*\)$'
+    "
+    " OR, patterns such as:
+    "
+    " Unsupported use of '||'. In fish, please use 'COMMAND; or COMMAND'.
+    " /tmp/vLz620o/258/test.fish (line 2): if set -q SSH_CLIENT || set -q SSH_TTY
+    "                                                            ^
+    "
+    " fish -n can return errors in either format.
+    let l:pattern = '^\(.* (line \(\d\+\)): \)\(.*\)$'
+    let l:column_pattern = '^ *\^'
     let l:output = []
+    let l:column_offset = 0
+    let l:last_line_with_message = ''
 
-    let l:i = 0
-    while l:i < len(a:lines)
-      let l:match = matchlist(a:lines[l:i], l:pattern)
-      if len(l:match) && len(l:match[2])
-        call add(l:output, {
-              \  'col': len(a:lines[l:i + 2]),
-              \  'lnum': str2nr(l:match[1]),
-              \  'text': l:match[2],
-              \})
-      endif
-      let l:i += 1
-    endwhile
+    for l:line in a:lines
+        " Look for error lines first.
+        let l:match = matchlist(l:line, l:pattern)
+
+        if !empty(l:match)
+            if !empty(l:last_line_with_message)
+                let l:text = l:last_line_with_message
+            else
+                let l:text = l:match[3]
+            endif
+
+            let l:column_offset = len(l:match[1])
+
+            let l:last_line_with_message = ''
+            call add(l:output, {
+            \  'col': 0,
+            \  'lnum': str2nr(l:match[2]),
+            \  'text': l:text,
+            \})
+        else
+            " Look for column markers like '   ^' second.
+            " The column index will be set according to how long the line is.
+            let l:column_match = matchstr(l:line, l:column_pattern)
+
+            if !empty(l:column_match) && !empty(l:output)
+                let l:output[-1].col = len(l:column_match) - l:column_offset
+                let l:last_line_with_message = ''
+            else
+                let l:last_line_with_message = l:line
+                let l:column_offset = 0
+            endif
+        endif
+    endfor
 
     return l:output
 endfunction

test/handler/test_fish_handler.vader

@@ -37,3 +37,25 @@ Execute(The fish handler should handle basic warnings and syntax errors):
   \    "abbr --add p 'cd ~/Projects'",
   \    '^',
   \ ])
+
+Execute(The fish handler should handle problems where the problem before before the line with the line number):
+  AssertEqual
+  \ [
+  \   {
+  \     'lnum': 2,
+  \     'col': 23,
+  \     'text': 'Unsupported use of ''||''. In fish, please use ''COMMAND; or COMMAND''.',
+  \   },
+  \   {
+  \     'lnum': 5,
+  \     'col': 1,
+  \     'text': 'wat',
+  \   },
+  \ ],
+  \ ale_linters#fish#fish#Handle(bufnr(''), [
+  \   'Unsupported use of ''||''. In fish, please use ''COMMAND; or COMMAND''.',
+  \   '/tmp/vLz620o/258/test.fish (line 2): if set -q SSH_CLIENT || set -q SSH_TTY',
+  \   '                                                           ^',
+  \   '/tmp/vLz620o/258/test.fish (line 5): wat',
+  \   '                                     ^',
+  \ ])