vim-patch:8.2.4749: <script> is not expanded in autocmd context

Problem:    <script> is not expanded in autocmd context.
Solution:   Add the context to the pattern struct. (closes vim/vim#10144)
            Rename AutoPatCmd to AutoPatCmd_T.
https://github.com/vim/vim/commit/eca7c60d68e63001dbe3c8e5d240b0895e607fc3

Omit AutoPatCmd -> AutoPatCmd_T rename as it is inconsistent.
Use `.sn_name` instead of `->sn_name` as v8.2.0154 hasn't been ported.
Omit acp_script_stx(), use member directly.

4 files changed, 65 insertions, 39 deletions

diff --git a/src/nvim/autocmd.c b/src/nvim/autocmd.c
index 579c6c029f..c20db2910c 100644
--- a/src/nvim/autocmd.c
+++ b/src/nvim/autocmd.c
@@ -1811,16 +1811,15 @@ bool apply_autocmds_group(event_T event, char *fname, char *fname_io, bool force
   char *tail = path_tail(fname);
 
   // Find first autocommand that matches
-  AutoPatCmd patcmd;
-  patcmd.curpat = first_autopat[(int)event];
-  patcmd.nextcmd = NULL;
-  patcmd.group = group;
-  patcmd.fname = fname;
-  patcmd.sfname = sfname;
-  patcmd.tail = tail;
-  patcmd.event = event;
-  patcmd.arg_bufnr = autocmd_bufnr;
-  patcmd.next = NULL;
+  AutoPatCmd patcmd = {
+    .curpat = first_autopat[(int)event],
+    .group = group,
+    .fname = fname,
+    .sfname = sfname,
+    .tail = tail,
+    .event = event,
+    .arg_bufnr = autocmd_bufnr,
+  };
   auto_next_pat(&patcmd, false);
 
   // found one, start executing the autocommands
@@ -1984,9 +1983,12 @@ void auto_next_pat(AutoPatCmd *apc, int stop_at_last)
   AutoPat *ap;
   AutoCmd *cp;
   char *s;
-  char **const sourcing_namep = &SOURCING_NAME;
 
-  XFREE_CLEAR(*sourcing_namep);
+  estack_T *const entry = ((estack_T *)exestack.ga_data) + exestack.ga_len - 1;
+
+  // Clear the exestack entry for this ETYPE_AUCMD entry.
+  XFREE_CLEAR(entry->es_name);
+  entry->es_info.aucmd = NULL;
 
   for (ap = apc->curpat; ap != NULL && !got_int; ap = ap->next) {
     apc->curpat = NULL;
@@ -2011,14 +2013,18 @@ void auto_next_pat(AutoPatCmd *apc, int stop_at_last)
         const size_t sourcing_name_len
           = (STRLEN(s) + strlen(name) + (size_t)ap->patlen + 1);
 
-        *sourcing_namep = xmalloc(sourcing_name_len);
-        snprintf(*sourcing_namep, sourcing_name_len, s, name, ap->pat);
+        char *const namep = xmalloc(sourcing_name_len);
+        snprintf(namep, sourcing_name_len, s, name, ap->pat);
         if (p_verbose >= 8) {
           verbose_enter();
-          smsg(_("Executing %s"), *sourcing_namep);
+          smsg(_("Executing %s"), namep);
           verbose_leave();
         }
 
+        // Update the exestack entry for this autocmd.
+        entry->es_name = namep;
+        entry->es_info.aucmd = apc;
+
         apc->curpat = ap;
         apc->nextcmd = ap->cmds;
         // mark last command
@@ -2150,6 +2156,7 @@ char *getnextac(int c, void *cookie, int indent, bool do_concat)
   // lua code, so that it works properly
   autocmd_nested = ac->nested;
   current_sctx = ac->script_ctx;
+  acp->script_ctx = current_sctx;
 
   if (ac->exec.type == CALLABLE_CB) {
     if (call_autocmd_callback(ac, acp)) {
diff --git a/src/nvim/autocmd.h b/src/nvim/autocmd.h
index d559d8c3d2..75a8a7aaa1 100644
--- a/src/nvim/autocmd.h
+++ b/src/nvim/autocmd.h
@@ -29,7 +29,7 @@ struct AutoCmd_S {
   bool nested;                          // If autocommands nest here
   bool last;                            // last command in list
   int64_t id;                           // ID used for uniquely tracking an autocmd.
-  sctx_T script_ctx;                    // script context where defined
+  sctx_T script_ctx;                    // script context where it is defined
   char *desc;                           // Description for the autocmd.
   AutoCmd *next;                        // Next AutoCmd in list
 };
@@ -59,6 +59,7 @@ struct AutoPatCmd_S {
   char *sfname;             // sfname to match with
   char *tail;               // tail of fname
   event_T event;            // current event
+  sctx_T script_ctx;        // script context where it is defined
   int arg_bufnr;            // initially equal to <abuf>, set to zero when buf is deleted
   Object *data;             // arbitrary data
   AutoPatCmd *next;         // chain of active apc-s for auto-invalidation
diff --git a/src/nvim/runtime.c b/src/nvim/runtime.c
index 412b78728e..038aad12a4 100644
--- a/src/nvim/runtime.c
+++ b/src/nvim/runtime.c
@@ -104,7 +104,7 @@ void estack_pop(void)
 ///               ESTACK_SCRIPT for <script>.
 char *estack_sfile(estack_arg_T which)
 {
-  estack_T *entry = ((estack_T *)exestack.ga_data) + exestack.ga_len - 1;
+  const estack_T *entry = ((estack_T *)exestack.ga_data) + exestack.ga_len - 1;
   if (which == ESTACK_SFILE && entry->es_type != ETYPE_UFUNC) {
     if (entry->es_name == NULL) {
       return NULL;
@@ -112,22 +112,31 @@ char *estack_sfile(estack_arg_T which)
     return xstrdup(entry->es_name);
   }
 
-  // If evaluated in a function return the path of the script where the
-  // function is defined, at script level the current script path is returned
+  // If evaluated in a function or autocommand, return the path of the script
+  // where it is defined, at script level the current script path is returned
   // instead.
   if (which == ESTACK_SCRIPT) {
-    if (entry->es_type == ETYPE_UFUNC) {
-      sctx_T *def_ctx = &entry->es_info.ufunc->uf_script_ctx;
-      if (def_ctx->sc_sid > 0) {
-        return xstrdup((char *)(SCRIPT_ITEM(def_ctx->sc_sid).sn_name));
-      }
-    } else if (exestack.ga_len > 0) {
-      // Walk the stack backwards, starting from the current frame.
-      for (int idx = exestack.ga_len - 1; idx; idx--) {
-        entry = ((estack_T *)exestack.ga_data) + idx;
-        if (entry->es_type == ETYPE_SCRIPT) {
-          return xstrdup(entry->es_name);
+    assert(entry == ((estack_T *)exestack.ga_data) + exestack.ga_len - 1);
+    // Walk the stack backwards, starting from the current frame.
+    for (int idx = exestack.ga_len - 1; idx >= 0; idx--, entry--) {
+      if (entry->es_type == ETYPE_UFUNC) {
+        const sctx_T *const def_ctx = &entry->es_info.ufunc->uf_script_ctx;
+
+        if (def_ctx->sc_sid > 0) {
+          return xstrdup((char *)(SCRIPT_ITEM(def_ctx->sc_sid).sn_name));
+        } else {
+          return NULL;
+        }
+      } else if (entry->es_type == ETYPE_AUCMD) {
+        const sctx_T *const def_ctx = &entry->es_info.aucmd->script_ctx;
+
+        if (def_ctx->sc_sid > 0) {
+          return xstrdup((char *)(SCRIPT_ITEM(def_ctx->sc_sid).sn_name));
+        } else {
+          return NULL;
         }
+      } else if (entry->es_type == ETYPE_SCRIPT) {
+        return xstrdup(entry->es_name);
       }
     }
     return NULL;
diff --git a/src/nvim/testdir/test_expand.vim b/src/nvim/testdir/test_expand.vim
index 6579e09d5e..aa131a49ff 100644
--- a/src/nvim/testdir/test_expand.vim
+++ b/src/nvim/testdir/test_expand.vim
@@ -157,43 +157,52 @@ endfunc
 
 func Test_expand_script_source()
   let lines0 =<< trim [SCRIPT]
-    let g:script_level[0] = expand('<script>:t')
+    call extend(g:script_level, [expand('<script>:t')])
     so Xscript1
     func F0()
-      let g:func_level[0] = expand('<script>:t')
+      call extend(g:func_level, [expand('<script>:t')])
     endfunc
+
+    au User * call extend(g:au_level, [expand('<script>:t')])
   [SCRIPT]
 
   let lines1 =<< trim [SCRIPT]
-    let g:script_level[1] = expand('<script>:t')
+    call extend(g:script_level, [expand('<script>:t')])
     so Xscript2
     func F1()
-      let g:func_level[1] = expand('<script>:t')
+      call extend(g:func_level, [expand('<script>:t')])
     endfunc
+
+    au User * call extend(g:au_level, [expand('<script>:t')])
   [SCRIPT]
 
   let lines2 =<< trim [SCRIPT]
-    let g:script_level[2] = expand('<script>:t')
+    call extend(g:script_level, [expand('<script>:t')])
     func F2()
-      let g:func_level[2] = expand('<script>:t')
+      call extend(g:func_level, [expand('<script>:t')])
     endfunc
+
+    au User * call extend(g:au_level, [expand('<script>:t')])
   [SCRIPT]
 
   call writefile(lines0, 'Xscript0')
   call writefile(lines1, 'Xscript1')
   call writefile(lines2, 'Xscript2')
 
-  " Check the expansion of <script> at script and function level.
-  let g:script_level = ['', '', '']
-  let g:func_level = ['', '', '']
+  " Check the expansion of <script> at different levels.
+  let g:script_level = []
+  let g:func_level = []
+  let g:au_level = []
 
   so Xscript0
   call F0()
   call F1()
   call F2()
+  doautocmd User
 
   call assert_equal(['Xscript0', 'Xscript1', 'Xscript2'], g:script_level)
   call assert_equal(['Xscript0', 'Xscript1', 'Xscript2'], g:func_level)
+  call assert_equal(['Xscript2', 'Xscript1', 'Xscript0'], g:au_level)
 
   unlet g:script_level g:func_level
   delfunc F0