vim-patch:7.4.312

Problem:    Cannot figure out what argument list is being used for a window.
Solution:   Add the arglistid() function. (Marcin Szamotulski)

https://code.google.com/p/vim/source/detail?r=v7-4-312

src/nvim/buffer_defs.h

@@ -255,6 +255,7 @@ struct wininfo_S {
 typedef struct arglist {
   garray_T al_ga;               /* growarray with the array of file names */
   int al_refcount;              /* number of windows using this arglist */
+  int id;                       ///< id of this arglist
 } alist_T;
 
 /*

src/nvim/eval.c

@@ -6311,6 +6311,7 @@ static struct fst {
   {"append",          2, 2, f_append},
   {"argc",            0, 0, f_argc},
   {"argidx",          0, 0, f_argidx},
+  {"arglistid",       0, 2, f_arglistid},
   {"argv",            0, 1, f_argv},
   {"asin",            1, 1, f_asin},    /* WJMc */
   {"atan",            1, 1, f_atan},
@@ -7203,6 +7204,32 @@ static void f_argidx(typval_T *argvars, typval_T *rettv)
   rettv->vval.v_number = curwin->w_arg_idx;
 }
 
+/// "arglistid" function
+static void f_arglistid(typval_T *argvars, typval_T *rettv)
+{
+  rettv->vval.v_number = -1;
+  if (argvars[0].v_type != VAR_UNKNOWN) {
+    tabpage_T *tp = NULL;
+    if (argvars[1].v_type != VAR_UNKNOWN) {
+      long n = get_tv_number(&argvars[1]);
+      if (n >= 0) {
+        tp = find_tabpage(n);
+      }
+    } else {
+      tp = curtab;
+    }
+
+    if (tp != NULL) {
+      win_T *wp = find_win_by_nr(&argvars[0], tp);
+      if (wp != NULL) {
+        rettv->vval.v_number = wp->w_alist->id;
+      }
+    }
+  } else {
+    rettv->vval.v_number = curwin->w_alist->id;
+  }
+}
+
 /*
  * "argv(nr)" function
  */

src/nvim/ex_docmd.c

@@ -5504,6 +5504,7 @@ void alist_new(void)
 {
   curwin->w_alist = xmalloc(sizeof(*curwin->w_alist));
   curwin->w_alist->al_refcount = 1;
+  curwin->w_alist->id = ++max_alist_id;
   alist_init(curwin->w_alist);
 }
 

src/nvim/globals.h

@@ -568,6 +568,7 @@ EXTERN int mf_dont_release INIT(= FALSE);       /* don't release blocks */
  * to this when the window is using the global argument list.
  */
 EXTERN alist_T global_alist;    /* global argument list */
+EXTERN int max_alist_id INIT(= 0);     ///< the previous argument list id
 EXTERN int arg_had_last INIT(= FALSE);      /* accessed last file in
                                                global_alist */
 

src/nvim/main.c

@@ -192,6 +192,7 @@ int main(int argc, char **argv)
   init_yank();                  /* init yank buffers */
 
   alist_init(&global_alist);    /* Init the argument list to empty. */
+  global_alist.id = 0;
 
   /*
    * Set the default values for the options.

src/nvim/version.c

@@ -283,7 +283,7 @@ static int included_patches[] = {
   315,
   314,
   //313,
-  //312,
+  312,
   //311,
   //310,
   309,