vim-patch:7.4.1820

Problem:    Removing language from help tags too often.
Solution:   Only remove @en when not needed. (Hirohito Higashi)

https://github.com/vim/vim/commit/9ccaae04c6f263e6db14fc403bca2404a7871114

3 files changed, 130 insertions, 5 deletions

diff --git a/src/nvim/ex_getln.c b/src/nvim/ex_getln.c
index b098f7d4ee..4c997844ea 100644
--- a/src/nvim/ex_getln.c
+++ b/src/nvim/ex_getln.c
@@ -3688,10 +3688,7 @@ static void cleanup_help_tags(int num_file, char_u **file)
     if (len <= 0) {
       continue;
     }
-    if (STRCMP(file[i] + len, buf) == 0) {
-      // remove the default language
-      file[i][len] = NUL;
-    } else if (STRCMP(file[i] + len, "@en") == 0) {
+    if (STRCMP(file[i] + len, "@en") == 0) {
       // Sorting on priority means the same item in another language may
       // be anywhere.  Search all items for a match up to the "@en".
       int j;
@@ -3708,6 +3705,19 @@ static void cleanup_help_tags(int num_file, char_u **file)
       }
     }
   }
+
+  if (*buf != NUL) {
+    for (int i = 0; i < num_file; i++) {
+      int len = (int)STRLEN(file[i]) - 3;
+      if (len <= 0) {
+        continue;
+      }
+      if (STRCMP(file[i] + len, buf) == 0) {
+        // remove the default language
+        file[i][len] = NUL;
+      }
+    }
+  }
 }
 
 /*
diff --git a/src/nvim/testdir/test_help_tagjump.vim b/src/nvim/testdir/test_help_tagjump.vim
index 42f8391aba..4e09e1f56b 100644
--- a/src/nvim/testdir/test_help_tagjump.vim
+++ b/src/nvim/testdir/test_help_tagjump.vim
@@ -48,3 +48,118 @@ func Test_help_tagjump()
   call assert_true(getline('.') =~ '\*{address}\*')
   helpclose
 endfunc
+
+let s:langs = ['en', 'ab', 'ja']
+
+func s:doc_config_setup()
+  let s:helpfile_save = &helpfile
+  let &helpfile="Xdir1/doc-en/doc/testdoc.txt"
+  let s:rtp_save = &rtp
+  let &rtp="Xdir1/doc-en"
+  if has('multi_lang')
+    let s:helplang_save=&helplang
+  endif
+
+  call delete('Xdir1', 'rf')
+
+  for lang in s:langs
+    if lang ==# 'en'
+      let tagfname = 'tags'
+      let docfname = 'testdoc.txt'
+    else
+      let tagfname = 'tags-' . lang
+      let docfname = 'testdoc.' . lang . 'x'
+    endif
+    let docdir = "Xdir1/doc-" . lang . "/doc"
+    call mkdir(docdir, "p")
+    call writefile(["\t*test-char*", "\t*test-col*"], docdir . '/' . docfname)
+    call writefile(["test-char\t" . docfname . "\t/*test-char*",
+          \         "test-col\t" . docfname . "\t/*test-col*"],
+          \         docdir . '/' . tagfname)
+  endfor
+endfunc
+
+func s:doc_config_teardown()
+  call delete('Xdir1', 'rf')
+
+  let &helpfile = s:helpfile_save
+  let &rtp = s:rtp_save
+  if has('multi_lang')
+    let &helplang = s:helplang_save
+  endif
+endfunc
+
+func s:get_cmd_compl_list(cmd)
+  let list = []
+  let str = ''
+  for cnt in range(1, 999)
+    call feedkeys(a:cmd . repeat("\<Tab>", cnt) . "'\<C-B>let str='\<CR>", 'tx')
+    if str ==# a:cmd[1:]
+      break
+    endif
+    call add(list, str)
+  endfor
+  return list
+endfunc
+
+func Test_help_complete()
+  try
+    let list = []
+    call s:doc_config_setup()
+
+    " 'helplang=' and help file lang is 'en'
+    if has('multi_lang')
+      set helplang=
+    endif
+    let list = s:get_cmd_compl_list(":h test")
+    call assert_equal(['h test-col', 'h test-char'], list)
+
+    if has('multi_lang')
+      " 'helplang=ab' and help file lang is 'en'
+      set helplang=ab
+      let list = s:get_cmd_compl_list(":h test")
+      call assert_equal(['h test-col', 'h test-char'], list)
+
+      " 'helplang=' and help file lang is 'en' and 'ab'
+      set rtp+=Xdir1/doc-ab
+      set helplang=
+      let list = s:get_cmd_compl_list(":h test")
+      call assert_equal(['h test-col@en', 'h test-col@ab',
+            \             'h test-char@en', 'h test-char@ab'], list)
+
+      " 'helplang=ab' and help file lang is 'en' and 'ab'
+      set helplang=ab
+      let list = s:get_cmd_compl_list(":h test")
+      call assert_equal(['h test-col', 'h test-col@en',
+            \             'h test-char', 'h test-char@en'], list)
+
+      " 'helplang=' and help file lang is 'en', 'ab' and 'ja'
+      set rtp+=Xdir1/doc-ja
+      set helplang=
+      let list = s:get_cmd_compl_list(":h test")
+      call assert_equal(['h test-col@en', 'h test-col@ab',
+            \             'h test-col@ja', 'h test-char@en',
+            \             'h test-char@ab', 'h test-char@ja'], list)
+
+      " 'helplang=ab' and help file lang is 'en', 'ab' and 'ja'
+      set helplang=ab
+      let list = s:get_cmd_compl_list(":h test")
+      call assert_equal(['h test-col', 'h test-col@en',
+            \             'h test-col@ja', 'h test-char',
+            \             'h test-char@en', 'h test-char@ja'], list)
+
+      " 'helplang=ab,ja' and help file lang is 'en', 'ab' and 'ja'
+      set helplang=ab,ja
+      let list = s:get_cmd_compl_list(":h test")
+      call assert_equal(['h test-col', 'h test-col@ja',
+            \             'h test-col@en', 'h test-char',
+            \             'h test-char@ja', 'h test-char@en'], list)
+    endif
+  catch
+    call assert_exception('X')
+  finally
+    call s:doc_config_teardown()
+  endtry
+endfunc
+
+" vim: et sw=2:
diff --git a/src/nvim/version.c b/src/nvim/version.c
index 2f091ffc7a..41e295f65e 100644
--- a/src/nvim/version.c
+++ b/src/nvim/version.c
@@ -621,7 +621,7 @@ static int included_patches[] = {
   // 1823,
   // 1822 NA
   // 1821,
-  // 1820,
+  1820,
   // 1819 NA
   1818,
   // 1817 NA