patch 8.0.1330: MS-Windows: job in terminal can't get back to Vim

Problem:    MS-Windows: job in terminal can't get back to Vim.
Solution:   set VIM_SERVERNAME in the environment. (Yasuhiro Matsumoto, closes
            #2360)

runtime/doc/terminal.txt

@@ -1,4 +1,4 @@
-*terminal.txt*	For Vim version 8.0.  Last change: 2017 Nov 12
+*terminal.txt*	For Vim version 8.0.  Last change: 2017 Nov 17
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -106,6 +106,10 @@ BufWinEnter autocommand event is triggered.  This makes it possible to set
 options specifically for the window and buffer.  Example: >
    au BufWinEnter * if &buftype == 'terminal' | setlocal bufhidden=hide | endif
 
+Mouse events (click and drag) are passed to the terminal.  Mouse move events
+are only passed when Vim itself is receiving them.  For a terminal that is
+when 'balloonevalterm' is enabled.
+
 
 Size and color ~
 							*terminal-size-color*
@@ -335,6 +339,9 @@ to point to the right file, if needed.  If you have both the 32-bit and 64-bit
 version, rename to winpty32.dll and winpty64.dll to match the way Vim was
 build.
 
+Environment variables are used to pass information to the running job:
+    VIM_SERVERNAME	v:servername
+
 ==============================================================================
 2. Remote testing					*terminal-testing*
 

src/os_win32.c

@@ -5034,10 +5034,10 @@ job_io_file_open(
  * environment argument of vim_create_process().
  */
     void
-win32_build_env(dict_T *env, garray_T *gap)
+win32_build_env(dict_T *env, garray_T *gap, int is_terminal)
 {
     hashitem_T	*hi;
-    int		todo = (int)env->dv_hashtab.ht_used;
+    long_u	todo = env != NULL ? env->dv_hashtab.ht_used : 0;
     LPVOID	base = GetEnvironmentStringsW();
 
     /* for last \0 */
@@ -5062,6 +5062,8 @@ win32_build_env(dict_T *env, garray_T *gap)
 	*((WCHAR*)gap->ga_data + gap->ga_len++) = L'\0';
     }
 
+    if (env != NULL)
+    {
 	for (hi = env->dv_hashtab.ht_array; todo > 0; ++hi)
 	{
 	    if (!HASHITEM_EMPTY(hi))
@@ -5089,9 +5091,28 @@ win32_build_env(dict_T *env, garray_T *gap)
 		if (wval != NULL) vim_free(wval);
 	    }
 	}
+    }
 
+# ifdef FEAT_CLIENTSERVER
+    if (is_terminal)
+    {
+	char_u	*servername = get_vim_var_str(VV_SEND_SERVER);
+	size_t	lval = STRLEN(servername);
+	size_t	n;
+
+	if (ga_grow(gap, (int)(14 + lval + 2)) == OK)
+	{
+	    for (n = 0; n < 15; n++)
+		*((WCHAR*)gap->ga_data + gap->ga_len++) =
+		    (WCHAR)"VIM_SERVERNAME="[n];
+	    for (n = 0; n < lval; n++)
+		*((WCHAR*)gap->ga_data + gap->ga_len++) =
+		    (WCHAR)servername[n];
 	    *((WCHAR*)gap->ga_data + gap->ga_len++) = L'\0';
 	}
+    }
+# endif
+}
 
     void
 mch_job_start(char *cmd, job_T *job, jobopt_T *options)
@@ -5133,7 +5154,7 @@ mch_job_start(char *cmd, job_T *job, jobopt_T *options)
     }
 
     if (options->jo_env != NULL)
-	win32_build_env(options->jo_env, &ga);
+	win32_build_env(options->jo_env, &ga, FALSE);
 
     ZeroMemory(&pi, sizeof(pi));
     ZeroMemory(&si, sizeof(si));

src/proto/os_win32.pro

@@ -67,5 +67,5 @@ void used_file_arg(char *name, int literal, int full_path, int diff_mode);
 void set_alist_count(void);
 void fix_arg_enc(void);
 int mch_setenv(char *var, char *value, int x);
-void win32_build_env(dict_T *l, garray_T *gap);
+void win32_build_env(dict_T *l, garray_T *gap, int is_terminal);
 /* vim: set ft=c : */

src/terminal.c

@@ -3424,12 +3424,10 @@ term_and_job_init(
 	return FAIL;
     if (opt->jo_cwd != NULL)
 	cwd_wchar = enc_to_utf16(opt->jo_cwd, NULL);
-    if (opt->jo_env != NULL)
-    {
+
     ga_init2(&ga_env, (int)sizeof(char*), 20);
-	win32_build_env(opt->jo_env, &ga_env);
+    win32_build_env(opt->jo_env, &ga_env, TRUE);
     env_wchar = ga_env.ga_data;
-    }
 
     job = job_alloc();
     if (job == NULL)
@@ -3531,7 +3529,6 @@ term_and_job_init(
 failed:
     if (argvar->v_type == VAR_LIST)
 	vim_free(ga_cmd.ga_data);
-    if (opt->jo_env != NULL)
     vim_free(ga_env.ga_data);
     vim_free(cmd_wchar);
     vim_free(cwd_wchar);

src/testdir/test_terminal.vim

@@ -434,6 +434,27 @@ func Test_terminal_cwd()
   call delete('Xdir', 'rf')
 endfunc
 
+func Test_terminal_servername()
+  if !has('clientserver')
+    return
+  endif
+  let g:buf = Run_shell_in_terminal({})
+  " Wait for the shell to display a prompt
+  call WaitFor('term_getline(g:buf, 1) != ""')
+  if has('win32')
+    call term_sendkeys(g:buf, "echo %VIM_SERVERNAME%\r")
+  else
+    call term_sendkeys(g:buf, "echo $VIM_SERVERNAME\r")
+  endif
+  call term_wait(g:buf)
+  call Stop_shell_in_terminal(g:buf)
+  call WaitFor('getline(2) == v:servername')
+  call assert_equal(v:servername, getline(2))
+
+  exe g:buf . 'bwipe'
+  unlet g:buf
+endfunc
+
 func Test_terminal_env()
   let g:buf = Run_shell_in_terminal({'env': {'TESTENV': 'correct'}})
   " Wait for the shell to display a prompt

src/version.c

@@ -771,6 +771,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1330,
 /**/
     1329,
 /**/