Fix #1584 - Make duplicate msgfmt messages easier to navigate

1 files changed, 21 insertions, 1 deletions

diff --git a/ale_linters/po/msgfmt.vim b/ale_linters/po/msgfmt.vim
index 578792bf..8279ccdc 100644
--- a/ale_linters/po/msgfmt.vim
+++ b/ale_linters/po/msgfmt.vim
@@ -1,10 +1,30 @@
 " Author: Cian Butler https://github.com/butlerx
 " Description: msgfmt for PO files
 
+function! ale_linters#po#msgfmt#Handle(buffer, lines) abort
+    let l:results = ale#handlers#unix#HandleAsWarning(a:buffer, a:lines)
+    let l:index = 0
+
+    for l:item in l:results
+        if l:index > 0 && l:item.text =~? 'this is the location of the first definition'
+            let l:last_item = l:results[l:index - 1]
+
+            if l:last_item.text =~? 'duplicate message definition'
+                let l:last_item.text = 'duplicate of message at line ' . l:item.lnum
+                let l:item.text = 'first location of duplicate of message at line ' . l:last_item.lnum
+            endif
+        endif
+
+        let l:index += 1
+    endfor
+
+    return l:results
+endfunction
+
 call ale#linter#Define('po', {
 \   'name': 'msgfmt',
 \   'executable': 'msgfmt',
 \   'output_stream': 'stderr',
 \   'command': 'msgfmt --statistics --output-file=- %t',
-\   'callback': 'ale#handlers#unix#HandleAsWarning',
+\   'callback': 'ale_linters#po#msgfmt#Handle',
 \})