vim-patch:8.2.1544: cannot translate messages in a Vim script

Problem:    Cannot translate messages in a Vim script.
Solution:   Add gettext().  Try it out for a few messages in the options
            window.

https://github.com/vim/vim/commit/0b39c3fd4c5d1c8ebd2efa85fced7df5e17efd3b

Co-authored-by: Bram Moolenaar <Bram@vim.org>

4 files changed, 45 insertions, 0 deletions

diff --git a/src/nvim/eval.lua b/src/nvim/eval.lua
index cc26bbf1a8..264659af1f 100644
--- a/src/nvim/eval.lua
+++ b/src/nvim/eval.lua
@@ -185,6 +185,7 @@ return {
     gettabvar={args={2, 3}, base=1},
     gettabwinvar={args={3, 4}, base=1},
     gettagstack={args={0, 1}, base=1},
+    gettext={args=1, base=1},
     getwininfo={args={0, 1}, base=1},
     getwinpos={args={0, 1}, base=1},
     getwinposx={},
diff --git a/src/nvim/eval/funcs.c b/src/nvim/eval/funcs.c
index b475ff1096..e08dc2e4a5 100644
--- a/src/nvim/eval/funcs.c
+++ b/src/nvim/eval/funcs.c
@@ -3502,6 +3502,19 @@ static void f_glob2regpat(typval_T *argvars, typval_T *rettv, EvalFuncData fptr)
   rettv->vval.v_string = (pat == NULL) ? NULL : file_pat_to_reg_pat(pat, NULL, NULL, false);
 }
 
+/// "gettext()" function
+static void f_gettext(typval_T *argvars, typval_T *rettv, EvalFuncData fptr)
+{
+  if (argvars[0].v_type != VAR_STRING
+      || argvars[0].vval.v_string == NULL
+      || *argvars[0].vval.v_string == NUL) {
+    semsg(_(e_invarg2), tv_get_string(&argvars[0]));
+  } else {
+    rettv->v_type = VAR_STRING;
+    rettv->vval.v_string = xstrdup(_(argvars[0].vval.v_string));
+  }
+}
+
 /// "has()" function
 static void f_has(typval_T *argvars, typval_T *rettv, EvalFuncData fptr)
 {
diff --git a/src/nvim/po/fixfilenames.vim b/src/nvim/po/fixfilenames.vim
new file mode 100644
index 0000000000..65d448ce41
--- /dev/null
+++ b/src/nvim/po/fixfilenames.vim
@@ -0,0 +1,13 @@
+" Invoked with the name "vim.pot" and a list of Vim script names.
+" Converts them to a .js file, stripping comments, so that xgettext works.
+
+set shortmess+=A
+
+for name in argv()[1:]
+  let jsname = fnamemodify(name, ":t:r") .. ".js"
+  exe "%s+" .. jsname .. "+" .. name .. "+"
+endfor
+
+write
+last
+quit
diff --git a/src/nvim/po/tojavascript.vim b/src/nvim/po/tojavascript.vim
new file mode 100644
index 0000000000..7868570be7
--- /dev/null
+++ b/src/nvim/po/tojavascript.vim
@@ -0,0 +1,18 @@
+" Invoked with the name "vim.pot" and a list of Vim script names.
+" Converts them to a .js file, stripping comments, so that xgettext works.
+" Javascript is used because, like Vim, it accepts both single and double
+" quoted strings.
+
+set shortmess+=A
+
+for name in argv()[1:]
+  exe 'edit ' .. fnameescape(name)
+
+  " Strip comments
+  g/^\s*"/s/.*//
+
+  " Write as .js file, xgettext recognizes them
+  exe 'w! ' .. fnamemodify(name, ":t:r") .. ".js"
+endfor
+
+quit