patch 8.0.0716: not easy to start Vim cleanly

Problem:    Not easy to start Vim cleanly without changing the viminfo file.
            Not possible to know whether the -i command line flag was used.
Solution:   Add the --clean command line argument.  Add the 'viminfofile'
            option.  Add "-u DEFAULTS".

runtime/doc/debug.txt

@@ -1,4 +1,4 @@
-*debug.txt*     For Vim version 8.0.  Last change: 2012 Feb 11
+*debug.txt*     For Vim version 8.0.  Last change: 2017 Jul 15
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -53,7 +53,7 @@ Use this command to start Vim:
 	valgrind --log-file=valgrind.log --leak-check=full ./vim
 
 Note: Vim will run much slower.  If your .vimrc is big or you have several
-plugins you need to be patient for startup, or run with the "-u NONE"
+plugins you need to be patient for startup, or run with the "--clean"
 argument.
 
 There are often a few leaks from libraries, such as getpwuid() and

runtime/doc/options.txt

@@ -4966,8 +4966,8 @@ A jump table for the options with a short description can be found at |Q_op|.
 	When on the plugin scripts are loaded when starting up |load-plugins|.
 	This option can be reset in your |vimrc| file to disable the loading
 	of plugins.
-	Note that using the "-u NONE" and "--noplugin" command line arguments
+	Note that using the "-u NONE", "-u DEFAULTS" and "--noplugin" command
-	reset this option. |-u| |--noplugin|
+	line arguments reset this option.  See |-u| and |--noplugin|.
 
 						*'luadll'*
 'luadll'		string	(default depends on the build)
@@ -7330,7 +7330,7 @@ A jump table for the options with a short description can be found at |Q_op|.
 
 	Watch out for errors in expressions.  They may render Vim unusable!
 	If you are stuck, hold down ':' or 'Q' to get a prompt, then quit and
-	edit your .vimrc or whatever with "vim -u NONE" to get it right.
+	edit your .vimrc or whatever with "vim --clean" to get it right.
 
 	Examples:
 	Emulate standard status line with 'ruler' set >
@@ -7755,7 +7755,7 @@ A jump table for the options with a short description can be found at |Q_op|.
 	NOTE: This option is reset when 'compatible' is set.
 
 						*'termkey'* *'tk'*
-'termkey' 'tk'	string	(default "CTRL-W")
+'termkey' 'tk'		string	(default "CTRL-W")
 			local to window
 			{not in Vi}
 	The key that precedes a Vim command in a terminal window.  Other keys
@@ -8333,13 +8333,14 @@ A jump table for the options with a short description can be found at |Q_op|.
 			{not available when compiled without the |+viminfo|
 			feature}
 	When non-empty, the viminfo file is read upon startup and written
-	when exiting Vim (see |viminfo-file|).  The string should be a comma
+	when exiting Vim (see |viminfo-file|). Except when 'viminfofile' is
-	separated list of parameters, each consisting of a single character
+	"NONE".
-	identifying the particular parameter, followed by a number or string
+	The string should be a comma separated list of parameters, each
-	which specifies the value of that parameter.  If a particular
+	consisting of a single character identifying the particular parameter,
-	character is left out, then the default value is used for that
+	followed by a number or string which specifies the value of that
-	parameter.  The following is a list of the identifying characters and
+	parameter.  If a particular character is left out, then the default
-	the effect of their value.
+	value is used for that parameter.  The following is a list of the
+	identifying characters and the effect of their value.
 	CHAR	VALUE	~
 							*viminfo-!*
 	!	When included, save and restore global variables that start
@@ -8399,9 +8400,9 @@ A jump table for the options with a short description can be found at |Q_op|.
 		has been used since the last search command.
 							*viminfo-n*
 	n	Name of the viminfo file.  The name must immediately follow
-		the 'n'.  Must be at the end of the option!  If the "-i"
+		the 'n'.  Must be at the end of the option!  If the
-		argument was given when starting Vim, that file name overrides
+		'viminfofile' option is set, that file name overrides the one
-		the one given here with 'viminfo'.  Environment variables are
+		given here with 'viminfo'.  Environment variables are
 		expanded when opening the file, not when setting the option.
 							*viminfo-r*
 	r	Removable media.  The argument is a string (up to the next
@@ -8442,6 +8443,17 @@ A jump table for the options with a short description can be found at |Q_op|.
 	NOTE: This option is set to the Vim default value when 'compatible'
 	is reset.
 
+				*'viminfofile'* *'vif'*
+'viminfofile' 'vif'	string	(default: "")
+			global
+			{not in Vi}
+			{not available when compiled without the |+viminfo|
+			feature}
+	When non-empty, overrides the file name used for viminfo.
+	When equal to "NONE" no viminfo file will be read or written.
+	This option can be set with the |-i| command line flag.  The |--clean|
+	command line flag sets it to "NONE".
+
 					    *'virtualedit'* *'ve'*
 'virtualedit' 've'	string	(default "")
 			global

runtime/doc/starting.txt

@@ -1,4 +1,4 @@
-*starting.txt*  For Vim version 8.0.  Last change: 2017 Jan 15
+*starting.txt*  For Vim version 8.0.  Last change: 2017 Jul 15
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -140,11 +140,12 @@ a slash.  Thus "-R" means recovery and "-/R" readonly.
 --noplugin	Skip loading plugins.  Resets the 'loadplugins' option.
 		{not in Vi}
 		Note that the |-u| argument may also disable loading plugins:
-			argument	load vimrc files	load plugins ~
+			argument   load: vimrc files  plugins  defaults.vim ~
-			(nothing)		yes		    yes
+			(nothing)	     yes	yes	  yes
-			-u NONE			no		    no
+			-u NONE		     no		no	  no
-			-u NORC			no		    yes
+			-u DEFAULTS	     no		no	  yes
-			--noplugin		yes		    no
+			-u NORC		     no		yes	  no
+			--noplugin	     yes	no	  yes
 
 --startuptime {fname}					*--startuptime*
 		During startup write timing messages to the file {fname}.
@@ -465,21 +466,30 @@ a slash.  Thus "-R" means recovery and "-/R" readonly.
 --nofork	GUI: Do not fork.  Same as |-f|.
 							*-u* *E282*
 -u {vimrc}	The file {vimrc} is read for initializations.  Most other
-		initializations are skipped; see |initialization|.  This can
+		initializations are skipped; see |initialization|.
-		be used to start Vim in a special mode, with special
+
+		This can be used to start Vim in a special mode, with special
 		mappings and settings.  A shell alias can be used to make
 		this easy to use.  For example: >
 			alias vimc vim -u ~/.c_vimrc !*
 <		Also consider using autocommands; see |autocommand|.
+
 		When {vimrc} is equal to "NONE" (all uppercase), all
 		initializations from files and environment variables are
 		skipped, including reading the |gvimrc| file when the GUI
 		starts.  Loading plugins is also skipped.
+
 		When {vimrc} is equal to "NORC" (all uppercase), this has the
 		same effect as "NONE", but loading plugins is not skipped.
-		Using the "-u" argument has the side effect that the
+
-		'compatible' option will be on by default.  This can have
+		When {vimrc} is equal to "DEFAULTS" (all uppercase), this has
-		unexpected effects.  See |'compatible'|.
+		the same effect as "NONE", but the |defaults.vim| script is
+		loaded, which will also set 'nocompatible'.
+
+		Using the "-u" argument with another argument than DEFAULTS
+		has the side effect that the 'compatible' option will be on by
+		default.  This can have unexpected effects.  See
+		|'compatible'|.
 		{not in Vi}
 
 							*-U* *E230*
@@ -497,6 +507,13 @@ a slash.  Thus "-R" means recovery and "-/R" readonly.
 		":rv" or ":wv" are used.  See also |viminfo-file|.
 		{not in Vi}
 
+							*--clean*
+--clean		Equal to "-u DEFAULTS -i NONE":
+		- initializations from files and environment variables is
+		  skipped
+		- the |defaults.vim| script is loaded, which implies
+		  'nocompatible': use Vim defaults
+		- no viminfo file is read or written
 							*-x*
 -x		Use encryption to read/write files.  Will prompt for a key,
 		which is then stored in the 'key' option.  All writes will
@@ -868,6 +885,7 @@ accordingly.  Vim proceeds in this order:
 	Loading plugins won't be done when:
 	- The 'loadplugins' option was reset in a vimrc file.
 	- The |--noplugin| command line argument is used.
+	- The |--clean| command line argument is used.
 	- The "-u NONE" command line argument is used |-u|.
 	- When Vim was compiled without the |+eval| feature.
 	Note that using "-c 'set noloadplugins'" doesn't work, because the
@@ -990,6 +1008,7 @@ starts its initializations.  But as soon as:
 - a vimrc file in the current directory, or
 - the "VIMINIT" environment variable is set, or
 - the "-N" command line argument is given, or
+- the "--clean" command line argument is given, or
   even when no vimrc file exists.
 - the |defaults.vim| script is loaded, or
 - gvimrc file was found,

runtime/doc/usr_01.txt

@@ -1,4 +1,4 @@
-*usr_01.txt*	For Vim version 8.0.  Last change: 2010 Nov 03
+*usr_01.txt*	For Vim version 8.0.  Last change: 2017 Jul 15
 
 		     VIM USER MANUAL - by Bram Moolenaar
 
@@ -140,19 +140,19 @@ On other systems, you have to do a little work:
 
 1. Copy the tutor file.  You can do this with Vim (it knows where to find it):
 >
-	vim -u NONE -c 'e $VIMRUNTIME/tutor/tutor' -c 'w! TUTORCOPY' -c 'q'
+	vim --clean -c 'e $VIMRUNTIME/tutor/tutor' -c 'w! TUTORCOPY' -c 'q'
 <
    This will write the file "TUTORCOPY" in the current directory.  To use a
 translated version of the tutor, append the two-letter language code to the
 filename.  For French:
 >
-	vim -u NONE -c 'e $VIMRUNTIME/tutor/tutor.fr' -c 'w! TUTORCOPY' -c 'q'
+	vim --clean -c 'e $VIMRUNTIME/tutor/tutor.fr' -c 'w! TUTORCOPY' -c 'q'
 <
 2. Edit the copied file with Vim:
 >
-	vim -u NONE -c "set nocp" TUTORCOPY
+	vim --clean TUTORCOPY
 <
-   The extra arguments make sure Vim is started in a good mood.
+   The --clean argument makes sure Vim is started with nice defaults.
 
 3. Delete the copied file when you are finished with it:
 >

src/channel.c

@@ -1438,6 +1438,7 @@ channel_write_in(channel_T *channel)
     if (!bufref_valid(&in_part->ch_bufref) || buf->b_ml.ml_mfp == NULL)
     {
 	/* buffer was wiped out or unloaded */
+	ch_log(channel, "input buffer has been wiped out");
 	in_part->ch_bufref.br_buf = NULL;
 	return;
     }
@@ -2338,7 +2339,7 @@ append_to_buffer(buf_T *buffer, char_u *msg, channel_T *channel, ch_part_T part)
     int		save_write_to = buffer->b_write_to_channel;
     chanpart_T  *ch_part = &channel->ch_part[part];
     int		save_p_ma = buffer->b_p_ma;
-    int		empty = (buffer->b_ml.ml_flags & ML_EMPTY);
+    int		empty = (buffer->b_ml.ml_flags & ML_EMPTY) ? 1 : 0;
 
     if (!buffer->b_p_ma && !ch_part->ch_nomodifiable)
     {
@@ -2359,13 +2360,14 @@ append_to_buffer(buf_T *buffer, char_u *msg, channel_T *channel, ch_part_T part)
     }
 
     /* Append to the buffer */
-    ch_logn(channel, "appending line %d to buffer", (int)lnum + 1);
+    ch_logn(channel, "appending line %d to buffer", (int)lnum + 1 - empty);
 
     buffer->b_p_ma = TRUE;
     curbuf = buffer;
+    curwin->w_buffer = curbuf;
     u_sync(TRUE);
     /* ignore undo failure, undo is not very useful here */
-    ignored = u_save(lnum, lnum + 1 + (empty ? 1 : 0));
+    ignored = u_save(lnum - empty, lnum + 1);
 
     if (empty)
     {
@@ -2377,6 +2379,7 @@ append_to_buffer(buf_T *buffer, char_u *msg, channel_T *channel, ch_part_T part)
 	ml_append(lnum, msg, 0, FALSE);
     appended_lines_mark(lnum, 1L);
     curbuf = save_curbuf;
+    curwin->w_buffer = curbuf;
     if (ch_part->ch_nomodifiable)
 	buffer->b_p_ma = FALSE;
     else
@@ -2483,9 +2486,11 @@ may_invoke_callback(channel_T *channel, ch_part_T part)
     }
 
     buffer = ch_part->ch_bufref.br_buf;
-    if (buffer != NULL && !bufref_valid(&ch_part->ch_bufref))
+    if (buffer != NULL && (!bufref_valid(&ch_part->ch_bufref)
+					       || buffer->b_ml.ml_mfp == NULL))
     {
-	/* buffer was wiped out */
+	/* buffer was wiped out or unloaded */
+	ch_logs(channel, "%s buffer has been wiped out", part_names[part]);
 	ch_part->ch_bufref.br_buf = NULL;
 	buffer = NULL;
     }

src/ex_cmds.c

@@ -1743,7 +1743,7 @@ static int  viminfo_errcnt;
 no_viminfo(void)
 {
     /* "vim -i NONE" does not read or write a viminfo file */
-    return (use_viminfo != NULL && STRCMP(use_viminfo, "NONE") == 0);
+    return STRCMP(p_viminfofile, "NONE") == 0;
 }
 
 /*
@@ -2093,8 +2093,8 @@ viminfo_filename(char_u *file)
 {
     if (file == NULL || *file == NUL)
     {
-	if (use_viminfo != NULL)
+	if (*p_viminfofile != NUL)
-	    file = use_viminfo;
+	    file = p_viminfofile;
 	else if ((file = find_viminfo_parameter('n')) == NULL || *file == NUL)
 	{
 #ifdef VIMINFO_FILE2

src/globals.h

@@ -1036,7 +1036,6 @@ EXTERN int	skip_redraw INIT(= FALSE);  /* skip redraw once */
 EXTERN int	do_redraw INIT(= FALSE);    /* extra redraw once */
 
 EXTERN int	need_highlight_changed INIT(= TRUE);
-EXTERN char_u	*use_viminfo INIT(= NULL);  /* name of viminfo file to use */
 
 #define NSCRIPT 15
 EXTERN FILE	*scriptin[NSCRIPT];	    /* streams to read script from */

src/main.c

@@ -433,7 +433,9 @@ vim_main2(void)
 #ifndef NO_VIM_MAIN
     /* Reset 'loadplugins' for "-u NONE" before "--cmd" arguments.
      * Allows for setting 'loadplugins' there. */
-    if (params.use_vimrc != NULL && STRCMP(params.use_vimrc, "NONE") == 0)
+    if (params.use_vimrc != NULL
+	    && (STRCMP(params.use_vimrc, "NONE") == 0
+		|| STRCMP(params.use_vimrc, "DEFAULTS") == 0))
 	p_lpl = FALSE;
 
     /* Execute --cmd arguments. */
@@ -1869,6 +1871,7 @@ command_line_scan(mparm_T *parmp)
 	    case '-':		/* "--" don't take any more option arguments */
 				/* "--help" give help message */
 				/* "--version" give version message */
+				/* "--clean" clean context */
 				/* "--literal" take files literally */
 				/* "--nofork" don't fork */
 				/* "--not-a-term" don't warn for not a term */
@@ -1886,6 +1889,11 @@ command_line_scan(mparm_T *parmp)
 		    msg_didout = FALSE;
 		    mch_exit(0);
 		}
+		else if (STRNICMP(argv[0] + argv_idx, "clean", 5) == 0)
+		{
+		    parmp->use_vimrc = (char_u *)"DEFAULTS";
+		    set_option_value((char_u *)"vif", 0L, (char_u *)"NONE", 0);
+		}
 		else if (STRNICMP(argv[0] + argv_idx, "literal", 7) == 0)
 		{
 #ifdef EXPAND_FILENAMES
@@ -2318,7 +2326,7 @@ command_line_scan(mparm_T *parmp)
 #endif
 
 		case 'i':	/* "-i {viminfo}" use for viminfo */
-		    use_viminfo = (char_u *)argv[0];
+		    set_option_value((char_u *)"vif", 0L, (char_u *)argv[0], 0);
 		    break;
 
 		case 's':	/* "-s {scriptin}" read from script file */
@@ -2988,7 +2996,9 @@ source_startup_scripts(mparm_T *parmp)
      */
     if (parmp->use_vimrc != NULL)
     {
-	if (STRCMP(parmp->use_vimrc, "NONE") == 0
+	if (STRCMP(parmp->use_vimrc, "DEFAULTS") == 0)
+	    do_source((char_u *)VIM_DEFAULTS_FILE, FALSE, DOSO_NONE);
+	else if (STRCMP(parmp->use_vimrc, "NONE") == 0
 				     || STRCMP(parmp->use_vimrc, "NORC") == 0)
 	{
 #ifdef FEAT_GUI
@@ -3383,6 +3393,7 @@ usage(void)
 #ifdef FEAT_VIMINFO
     main_msg(_("-i <viminfo>\t\tUse <viminfo> instead of .viminfo"));
 #endif
+    main_msg(_("--clean\t\t'nocompatible', Vim defaults, no plugins, no viminfo"));
     main_msg(_("-h  or  --help\tPrint Help (this message) and exit"));
     main_msg(_("--version\t\tPrint version information and exit"));
 

src/option.c

@@ -2981,6 +2981,15 @@ static struct vimoption options[] =
 			    {(char_u *)"", (char_u *)"'100,<50,s10,h"}
 # endif
 #endif
+#else
+			    (char_u *)NULL, PV_NONE,
+			    {(char_u *)0L, (char_u *)0L}
+#endif
+			    SCRIPTID_INIT},
+    {"viminfofile", "vif",  P_STRING|P_ONECOMMA|P_NODUP|P_SECURE|P_VI_DEF,
+#ifdef FEAT_VIMINFO
+			    (char_u *)&p_viminfofile, PV_NONE,
+			    {(char_u *)"", (char_u *)0L}
 #else
 			    (char_u *)NULL, PV_NONE,
 			    {(char_u *)0L, (char_u *)0L}

src/option.h

@@ -920,6 +920,7 @@ EXTERN char_u	*p_fcs;		/* 'fillchar' */
 #endif
 #ifdef FEAT_VIMINFO
 EXTERN char_u	*p_viminfo;	/* 'viminfo' */
+EXTERN char_u	*p_viminfofile;	/* 'viminfofile' */
 #endif
 #ifdef FEAT_SESSION
 EXTERN char_u	*p_vdir;	/* 'viewdir' */

src/testdir/test_channel.vim

@@ -739,6 +739,38 @@ func Test_pipe_to_buffer_name_nomsg()
   call Run_test_pipe_to_buffer(1, 0, 1)
 endfunc
 
+func Test_close_output_buffer()
+  if !has('job')
+    return
+  endif
+  enew!
+  let test_lines = ['one', 'two']
+  call setline(1, test_lines)
+  call ch_log('Test_close_output_buffer()')
+  let options = {'out_io': 'buffer'}
+  let options['out_name'] = 'buffer-output'
+  let options['out_msg'] = 0
+  split buffer-output
+  let job = job_start(s:python . " test_channel_write.py", options)
+  call assert_equal("run", job_status(job))
+  try
+    call WaitFor('line("$") == 3')
+    call assert_equal(3, line('$'))
+    quit!
+    sleep 100m
+    " Make sure the write didn't happen to the wrong buffer.
+    call assert_equal(test_lines, getline(1, line('$')))
+    call assert_equal(-1, bufwinnr('buffer-output'))
+    sbuf buffer-output
+    call assert_notequal(-1, bufwinnr('buffer-output'))
+    sleep 100m
+    close  " no more writes
+    bwipe!
+  finally
+    call job_stop(job)
+  endtry
+endfunc
+
 func Run_test_pipe_err_to_buffer(use_name, nomod, do_msg)
   if !has('job')
     return

src/testdir/test_channel_write.py

@@ -0,0 +1,18 @@
+#!/usr/bin/python
+#
+# Program that writes a number to stdout repeatedly
+#
+# This requires Python 2.6 or later.
+
+from __future__ import print_function
+import sys
+import time
+
+if __name__ == "__main__":
+
+    done = 0
+    while done < 10:
+        done = done + 1
+        print(done)
+        sys.stdout.flush()
+        time.sleep(0.05)  # sleep 50 msec

src/version.c

@@ -764,6 +764,10 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    716,
+/**/
+    715,
 /**/
     714,
 /**/