add smart home key

git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@1751 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

ChangeLog

@@ -53,6 +53,16 @@ CVS code -
 	- Wrap the long jump code in NANO_SMALL #ifdefs, since we only
 	  use it if we're resizing the window, which is disabled when
 	  NANO_SMALL is defined. (DLR)
+	- Add smart home key option, accessible via -A/--smarthome on
+	  the command line, "set smarthome" in the rcfile, and the
+	  Meta-H toggle in the edit window.  Smart home works as
+	  follows: When Home is pressed anywhere but at the very
+	  beginning of non-whitespace characters on a line, the cursor
+	  will jump to that beginning (either forwards or backwards).
+	  If the cursor is already at that position, it will jump to the
+	  true beginning of the line.  This option is disabled in tiny
+	  mode.  Changes to do_home(), nanogetstr(), etc. (DLR;
+	  suggested by Stephan T. Lavavej)
 - files.c:
   add_open_file()
 	- Rearrange the NANO_SMALL #ifdef so that the code to set the
@@ -231,6 +241,7 @@ CVS code -
 - nano.1:
 	- Document restricted mode. (IO ERROR)  DLR: Add minor
 	  modifications to account for the above changes.
+	- Document the smart home key option. (DLR)
 - nano.texi:
 	- Fix toggle inaccuracies: Meta-L now toggles line wrapping, and
 	  Meta-< and Meta-> aren't toggles. (DLR)
@@ -239,9 +250,11 @@ CVS code -
 	- Fix version number inaccuracies: Search/replace history and
 	  sorting/uniqueness filtering for the internal spell chacker
 	  were added in nano 1.1.99pre1. (DLR)
+	- Document the smart home key option. (DLR)
 - nanorc.sample:
 	- Add missing mouse entry, and update the nanorc sample regexes
 	  to account for the backupdir and mouse options. (DLR)
+	- Add smarthome description. (DLR)
 - README.CVS:
 	- Increase the minimum required autoconf version to 2.54, and
 	  change the recommended automake version 1.7 to the minimum

doc/man/nano.1

@@ -35,6 +35,13 @@ replace" and "go to line number".
 .B \+\fILINE\fP
 Places cursor at \fILINE\fP on startup.
 .TP
+.B \-A (\-\-smarthome)
+Make the Home key smarter.  When Home is pressed anywhere but at the
+very beginning of non-whitespace characters on a line, the cursor will
+jump to that beginning (either forwards or backwards).  If the cursor is
+already at that position, it will jump to the true beginning of the
+line.
+.TP
 .B \-B (\-\-backup)
 When saving a file, back up the previous version of it to the current
 filename suffixed with a ~.

doc/man/nanorc.5

@@ -108,6 +108,13 @@ acts like Delete on your system.
 \fBset/unset regexp\fP
 Do regular expression searches by default.
 .TP
+\fBset/unset smarthome\fP
+Make the Home key smarter.  When Home is pressed anywhere but at the
+very beginning of non-whitespace characters on a line, the cursor will
+jump to that beginning (either forwards or backwards).  If the cursor is
+already at that position, it will jump to the true beginning of the
+line.
+.TP
 \fBset/unset smooth\fP
 Use smooth scrolling by default.
 .TP

doc/nanorc.sample

@@ -79,6 +79,13 @@
 ## Do extended regular expression searches by default.
 # set regexp
 
+## Make the Home key smarter.  When Home is pressed anywhere but at the
+## very beginning of non-whitespace characters on a line, the cursor
+## will jump to that beginning (either forwards or backwards).  If the
+## cursor is already at that position, it will jump to the true
+## beginning of the line.
+# set smarthome
+
 ## Use smooth scrolling as the default.
 # set smooth
 
@@ -208,7 +215,7 @@
 ## highlight possible errors and parameters
 #color brightwhite "^ *(set|unset|syntax|color).*$"
 ## set, unset and syntax
-#color cyan "^ *(set|unset) +(autoindent|backup|backupdir|const|cut|fill|historylog|mouse|multibuffer|noconvert|nofollow|nohelp|nowrap|operatingdir|preserve|quotestr|rebinddelete|regexp|smooth|speller|suspend|tabsize|tempfile|view)"
+#color cyan "^ *(set|unset) +(autoindent|backup|backupdir|const|cut|fill|historylog|mouse|multibuffer|noconvert|nofollow|nohelp|nowrap|operatingdir|preserve|quotestr|rebinddelete|regexp|smarthome|smooth|speller|suspend|tabsize|tempfile|view)"
 #color green "^ *(set|unset|syntax)\>"
 ## colors
 #color yellow "^ *color +(bright)?(white|black|red|blue|green|yellow|magenta|cyan)(,(white|black|red|blue|green|yellow|magenta|cyan))?\>"

doc/texinfo/nano.texi

@@ -107,6 +107,13 @@ Email bug reports to @email{nano@@nano-editor.org}.
 
 @table @code
 
+@item -A, --smarthome
+Make the Home key smarter.  When Home is pressed anywhere but at the
+very beginning of non-whitespace characters on a line, the cursor will
+jump to that beginning (either forwards or backwards).  If the cursor is
+already at that position, it will jump to the true beginning of the
+line.
+
 @item -B, --backup
 When saving a file, back up the previous version of it to the current
 filename suffixed with a ~.
@@ -346,6 +353,9 @@ toggles the -D (@code{--dos}) command line flag.
 @item Multiple Files Toggle (Meta-F)
 toggles the -F (@code{--multibuffer}) command line flag.
 
+@item Backup File Toggle (Meta-H)
+toggles the -A (@code{--smarthome}) command line flag.
+
 @item AutoIndent Toggle (Meta-I)
 toggles the -i (@code{--autoindent}) command line flag.
 

src/global.c

@@ -231,7 +231,7 @@ void toggle_init(void)
     char *toggle_const_msg, *toggle_autoindent_msg, *toggle_suspend_msg,
 	*toggle_nohelp_msg, *toggle_cuttoend_msg,
 	*toggle_noconvert_msg, *toggle_dos_msg, *toggle_mac_msg,
-	*toggle_backup_msg, *toggle_smooth_msg;
+	*toggle_backup_msg, *toggle_smooth_msg, *toggle_smarthome_msg;
 #ifndef DISABLE_MOUSE
     char *toggle_mouse_msg;
 #endif
@@ -263,6 +263,7 @@ void toggle_init(void)
     toggle_mac_msg = _("Writing file in Mac format");
     toggle_backup_msg = _("Backing up file");
     toggle_smooth_msg = _("Smooth scrolling");
+    toggle_smarthome_msg = _("Smart home key");
 #ifdef ENABLE_COLOR
     toggle_syntax_msg = _("Color syntax highlighting");
 #endif
@@ -296,6 +297,7 @@ void toggle_init(void)
 	toggle_init_one(TOGGLE_BACKUP_KEY, toggle_backup_msg, BACKUP_FILE);
     }
     toggle_init_one(TOGGLE_SMOOTH_KEY, toggle_smooth_msg, SMOOTHSCROLL);
+    toggle_init_one(TOGGLE_SMARTHOME_KEY, toggle_smarthome_msg, SMART_HOME);
 #ifdef ENABLE_COLOR
     toggle_init_one(TOGGLE_SYNTAX_KEY, toggle_syntax_msg, COLOR_SYNTAX);
 #endif

src/move.c

@@ -23,14 +23,32 @@
 
 #include <stdlib.h>
 #include <string.h>
+#include <ctype.h>
 #include <assert.h>
 #include "proto.h"
 #include "nano.h"
 
 int do_home(void)
 {
-    current_x = 0;
-    placewewant = 0;
+#ifndef NANO_SMALL
+    if (ISSET(SMART_HOME)) {
+	int old_current_x = current_x;
+
+	for (current_x = 0; isblank(current->data[current_x]) &&
+		current->data[current_x] != '\0'; current_x++)
+	    ;
+
+	if (current_x == old_current_x || current->data[current_x] == '\0')
+	    current_x = 0;
+
+	placewewant = xplustabs();
+    } else {
+#endif
+	current_x = 0;
+	placewewant = 0;
+#ifndef NANO_SMALL
+    }
+#endif
     check_statblank();
     update_line(current, current_x);
     return 1;

src/nano.c

@@ -633,6 +633,7 @@ void usage(void)
     print1opt("-h, -?", "--help", _("Show this message"));
     print1opt(_("+LINE"), "", _("Start at line number LINE"));
 #ifndef NANO_SMALL
+    print1opt("-A", "--smarthome", _("Enable smart home key"));
     print1opt("-B", "--backup", _("Backup existing files on save"));
     print1opt("-D", "--dos", _("Write file in DOS format"));
     print1opt("-E", "--backupdir=[dir]", _("Directory for writing backup files"));
@@ -3057,6 +3058,7 @@ int main(int argc, char *argv[])
 	{"nohelp", 0, 0, 'x'},
 	{"suspend", 0, 0, 'z'},
 #ifndef NANO_SMALL
+	{"smarthome", 0, 0, 'A'},
 	{"backup", 0, 0, 'B'},
 	{"dos", 0, 0, 'D'},
 	{"backupdir", 1, 0, 'E'},
@@ -3085,11 +3087,11 @@ int main(int argc, char *argv[])
 #endif
 
 #ifdef HAVE_GETOPT_LONG
-    while ((optchr = getopt_long(argc, argv, "h?BDE:FHIMNQ:RST:VY:Zabcdefgijklmo:pr:s:tvwxz",
+    while ((optchr = getopt_long(argc, argv, "h?ABDE:FHIMNQ:RST:VY:Zabcdefgijklmo:pr:s:tvwxz",
 				 long_options, NULL)) != -1) {
 #else
     while ((optchr =
-	    getopt(argc, argv, "h?BDE:FHIMNQ:RST:VY:Zabcdefgijklmo:pr:s:tvwxz")) != -1) {
+	    getopt(argc, argv, "h?ABDE:FHIMNQ:RST:VY:Zabcdefgijklmo:pr:s:tvwxz")) != -1) {
 #endif
 
 	switch (optchr) {
@@ -3103,6 +3105,9 @@ int main(int argc, char *argv[])
 	    /* Pico compatibility flags */
 	    break;
 #ifndef NANO_SMALL
+	case 'A':
+	    SET(SMART_HOME);
+	    break;
 	case 'B':
 	    SET(BACKUP_FILE);
 	    break;

src/nano.h

@@ -278,6 +278,7 @@ typedef struct historyheadtype {
 #define HISTORY_CHANGED		(1<<27)
 #define HISTORYLOG		(1<<28)
 #define RESTRICTED		(1<<29)
+#define SMART_HOME		(1<<30)
 
 /* Control key sequences, changing these would be very very bad. */
 #define NANO_CONTROL_SPACE 0
@@ -446,6 +447,7 @@ typedef struct historyheadtype {
 #define TOGGLE_NOCONVERT_KEY	NANO_ALT_N
 #define TOGGLE_BACKUP_KEY	NANO_ALT_B
 #define TOGGLE_SYNTAX_KEY	NANO_ALT_Y
+#define TOGGLE_SMARTHOME_KEY	NANO_ALT_H
 #endif /* !NANO_SMALL */
 
 #define MAIN_VISIBLE 12

src/rcfile.c

@@ -80,6 +80,7 @@ const static rcoption rcopts[] = {
     {"regexp", USE_REGEXP},
 #endif
 #ifndef NANO_SMALL
+    {"smarthome", SMART_HOME},
     {"smooth", SMOOTHSCROLL},
 #endif
 #ifndef DISABLE_SPELLER

src/winio.c

@@ -1332,7 +1332,18 @@ int nanogetstr(int allowtabs, const char *buf, const char *def,
 	    break;
 #endif
 	case NANO_HOME_KEY:
-	    x = 0;
+#ifndef NANO_SMALL
+	    if (ISSET(SMART_HOME)) {
+		int old_x = x;
+
+		for (x = 0; isblank(answer[x]) && x < xend; x++)
+		    ;
+
+		if (x == old_x || x == xend)
+		    x = 0;
+	    } else
+#endif
+		x = 0;
 	    break;
 	case NANO_END_KEY:
 	    x = xend;