vim-patch:9.1.0770: current command line completion is a bit limited (#30728)

Problem:  current command completion is a bit limited
Solution: Add the shellcmdline completion type and getmdcomplpat()
          function (Ruslan Russkikh).

closes: vim/vim#15823

https://github.com/vim/vim/commit/0407d621bbad020b840ffbbbd25ba023bbc05edd

Co-authored-by: Ruslan Russkikh <dvrussk@yandex.ru>

1 files changed, 38 insertions, 1 deletions

diff --git a/src/nvim/ex_getln.c b/src/nvim/ex_getln.c
index ca01a158a3..b58a6b16f1 100644
--- a/src/nvim/ex_getln.c
+++ b/src/nvim/ex_getln.c
@@ -4086,14 +4086,44 @@ static char *get_cmdline_str(void)
   return xstrnsave(p->cmdbuff, (size_t)p->cmdlen);
 }
 
+/// Get the current command-line completion pattern.
+static char *get_cmdline_completion_pattern(void)
+{
+  if (cmdline_star > 0) {
+    return NULL;
+  }
+
+  CmdlineInfo *p = get_ccline_ptr();
+  if (p == NULL || p->xpc == NULL) {
+    return NULL;
+  }
+
+  int xp_context = p->xpc->xp_context;
+  if (xp_context == EXPAND_NOTHING) {
+    set_expand_context(p->xpc);
+    xp_context = p->xpc->xp_context;
+    p->xpc->xp_context = EXPAND_NOTHING;
+  }
+  if (xp_context == EXPAND_UNSUCCESSFUL) {
+    return NULL;
+  }
+
+  char *compl_pat = p->xpc->xp_pattern;
+  if (compl_pat == NULL) {
+    return NULL;
+  }
+
+  return xstrdup(compl_pat);
+}
+
 /// Get the current command-line completion type.
 static char *get_cmdline_completion(void)
 {
   if (cmdline_star > 0) {
     return NULL;
   }
-  CmdlineInfo *p = get_ccline_ptr();
 
+  CmdlineInfo *p = get_ccline_ptr();
   if (p == NULL || p->xpc == NULL) {
     return NULL;
   }
@@ -4123,6 +4153,13 @@ static char *get_cmdline_completion(void)
   return xstrdup(cmd_compl);
 }
 
+/// "getcmdcomplpat()" function
+void f_getcmdcomplpat(typval_T *argvars, typval_T *rettv, EvalFuncData fptr)
+{
+  rettv->v_type = VAR_STRING;
+  rettv->vval.v_string = get_cmdline_completion_pattern();
+}
+
 /// "getcmdcompltype()" function
 void f_getcmdcompltype(typval_T *argvars, typval_T *rettv, EvalFuncData fptr)
 {