patch 9.1.0207: No autocommand when writing session file

Commit: 
https://github.com/vim/vim/commit/e5f2280381250801a28dcff9823e6f94e7b163fc
Author: Colin Kennedy <colin...@gmail.com>
Date:   Tue Mar 26 18:20:16 2024 +0100

    patch 9.1.0207: No autocommand when writing session file
    
    Problem:  No autocommand when writing session file
    Solution: Add SessionWritePost autocommand
              (Colin Kennedy)
    
    fixes: ##14242
    closes: #14288
    
    Co-authored-by: zeertzjq <zeert...@outlook.com>
    Signed-off-by: Colin Kennedy <colin...@gmail.com>
    Signed-off-by: Christian Brabandt <c...@256bit.org>

diff --git a/runtime/doc/autocmd.txt b/runtime/doc/autocmd.txt
index 5f9f51ecb..32094b398 100644
--- a/runtime/doc/autocmd.txt
+++ b/runtime/doc/autocmd.txt
@@ -1,4 +1,4 @@
-*autocmd.txt*   For Vim version 9.1.  Last change: 2024 Jan 25
+*autocmd.txt*   For Vim version 9.1.  Last change: 2024 Mar 26
 
 
                  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -428,6 +428,9 @@ Name                        triggered by ~
 
 |SessionLoadPost|      after loading a session file
 
+|SessionWritePost|     After writing the session file using
+                       the |:mksession| command.
+
 |MenuPopup|            just before showing the popup menu
 |CompleteChanged|      after Insert mode completion menu changed
 |CompleteDonePre|      after Insert mode completion is done, before clearing
@@ -1114,6 +1117,9 @@ SafeStateAgain                    Like SafeState but 
after processing any
 
                                                        *SessionLoadPost*
 SessionLoadPost                        After loading the session file created 
using
+                               the |:mksession| command.
+                                                       *SessionWritePost*
+SessionWritePost               After writing a session file by calling
                                the |:mksession| command.
                                                        *ShellCmdPost*
 ShellCmdPost                   After executing a shell command with |:!cmd|,
diff --git a/runtime/doc/tags b/runtime/doc/tags
index 8dd4db241..4ff7095e0 100644
--- a/runtime/doc/tags
+++ b/runtime/doc/tags
@@ -5682,6 +5682,7 @@ Select-mode-mapping       visual.txt      
/*Select-mode-mapping*
 Session        starting.txt    /*Session*
 SessionLoad-variable   starting.txt    /*SessionLoad-variable*
 SessionLoadPost        autocmd.txt     /*SessionLoadPost*
+SessionWritePost       autocmd.txt     /*SessionWritePost*
 ShellCmdPost   autocmd.txt     /*ShellCmdPost*
 ShellFilterPost        autocmd.txt     /*ShellFilterPost*
 SigUSR1        autocmd.txt     /*SigUSR1*
diff --git a/runtime/doc/version9.txt b/runtime/doc/version9.txt
index bf16d4953..b94d15764 100644
--- a/runtime/doc/version9.txt
+++ b/runtime/doc/version9.txt
@@ -1,4 +1,4 @@
-*version9.txt*  For Vim version 9.1.  Last change: 2024 Mar 03
+*version9.txt*  For Vim version 9.1.  Last change: 2024 Mar 26
 
 
                  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -41570,6 +41570,7 @@ Functions: ~
 
 Autocommands: ~
 
+|SessionWritePost|     after writing the session file |:mksession|
 |TermResponseAll|      after the terminal response to |t_RV| and others is
                        received
 |WinNewPre|            before creating a new window
diff --git a/src/autocmd.c b/src/autocmd.c
index 8e43b3447..8a7e6072a 100644
--- a/src/autocmd.c
+++ b/src/autocmd.c
@@ -160,6 +160,7 @@ static struct event_name
     {"SafeState",      EVENT_SAFESTATE},
     {"SafeStateAgain", EVENT_SAFESTATEAGAIN},
     {"SessionLoadPost",        EVENT_SESSIONLOADPOST},
+    {"SessionWritePost",EVENT_SESSIONWRITEPOST},
     {"ShellCmdPost",   EVENT_SHELLCMDPOST},
     {"ShellFilterPost",        EVENT_SHELLFILTERPOST},
     {"SigUSR1",                EVENT_SIGUSR1},
diff --git a/src/session.c b/src/session.c
index e39ce4d4d..eea57a233 100644
--- a/src/session.c
+++ b/src/session.c
@@ -1392,6 +1392,8 @@ theend:
 #ifdef FEAT_SESSION
     vim_free(viewFile);
 #endif
+
+    apply_autocmds(EVENT_SESSIONWRITEPOST, NULL, NULL, FALSE, curbuf);
 }
 
 #if (defined(FEAT_VIMINFO) || defined(FEAT_SESSION)) || defined(PROTO)
diff --git a/src/testdir/test_autocmd.vim b/src/testdir/test_autocmd.vim
index 564d568c0..f0620040c 100644
--- a/src/testdir/test_autocmd.vim
+++ b/src/testdir/test_autocmd.vim
@@ -4474,4 +4474,60 @@ func Test_autocmd_creates_new_buffer_on_bufleave()
   bw c.txt
 endfunc
 
+" Ensure `expected` was just recently written as a Vim session
+func s:assert_session_path(expected)
+  call assert_equal(a:expected, v:this_session)
+endfunc
+
+" Check for `expected` after a session is written to-disk.
+func s:watch_for_session_path(expected)
+  execute 'autocmd SessionWritePost * ++once execute "call 
s:assert_session_path(\"'
+        \ . a:expected
+        \ . '\")"'
+endfunc
+
+" Ensure v:this_session gets the full session path, if explicitly stated
+func Test_explicit_session_absolute_path()
+  %bwipeout!
+
+  let directory = getcwd()
+
+  let v:this_session = ""
+  let name = "some_file.vim"
+  let expected = fnamemodify(name, ":p")
+  call s:watch_for_session_path(expected)
+  execute "mksession! " .. expected
+
+  call delete(expected)
+endfunc
+
+" Ensure v:this_session gets the full session path, if explicitly stated
+func Test_explicit_session_relative_path()
+  %bwipeout!
+
+  let directory = getcwd()
+
+  let v:this_session = ""
+  let name = "some_file.vim"
+  let expected = fnamemodify(name, ":p")
+  call s:watch_for_session_path(expected)
+  execute "mksession! " .. name
+
+  call delete(expected)
+endfunc
+
+" Ensure v:this_session gets the full session path, if not specified
+func Test_implicit_session()
+  %bwipeout!
+
+  let directory = getcwd()
+
+  let v:this_session = ""
+  let expected = fnamemodify("Session.vim", ":p")
+  call s:watch_for_session_path(expected)
+  mksession!
+
+  call delete(expected)
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab
diff --git a/src/version.c b/src/version.c
index 76bfd1026..8ab595719 100644
--- a/src/version.c
+++ b/src/version.c
@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    207,
 /**/
     206,
 /**/
diff --git a/src/vim.h b/src/vim.h
index a04be0837..63a31880d 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -1404,6 +1404,7 @@ enum auto_event
     EVENT_SAFESTATE,           // going to wait for a character
     EVENT_SAFESTATEAGAIN,      // still waiting for a character
     EVENT_SESSIONLOADPOST,     // after loading a session file
+    EVENT_SESSIONWRITEPOST,    // after writing a session file
     EVENT_SHELLCMDPOST,                // after ":!cmd"
     EVENT_SHELLFILTERPOST,     // after ":1,2!cmd", ":w !cmd", ":r !cmd".
     EVENT_SIGUSR1,             // after the SIGUSR1 signal

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