add Mike Frysinger's patch (with minor modifications) to allow

displaying other characters, specified in the rcfile, for the first
characters of tabs and spaces


git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@1782 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

ChangeLog

@@ -96,6 +96,11 @@ CVS code -
 	- Since KEEP_CUTBUFFER is only used in cut.c, make it a static
 	  variable in cut.c instead of a flag, and unset it in other
 	  files via the new function cutbuffer_reset(). (DLR)
+	- Add the ability to change the characters used to display the
+	  beginning characters of tabs and spaces via the rcfile entry
+	  "whitespace".  This is disabled if nanorc support is disabled
+	  or if we're in tiny mode. (Mike Frysinger; minor changes and
+	  adaptations by DLR)
 - files.c:
   add_open_file()
 	- Rearrange the NANO_SMALL #ifdef so that the code to set the
@@ -246,6 +251,11 @@ CVS code -
 	- Convert to properly handle strings generated by
 	  display_string() that have been used in the search prompt
 	  since 1.3.0. (David Benbennick)
+	- Use display_string() directly to display the text that we
+	  didn't find instead of relying on statusbar() to do it
+	  indirectly, since the latter won't display its text with the
+	  user-specified whitespace characters and the former will.
+	  (DLR)
 - utils.c:
   is_blank_char()
 	- New function used as an isblank() equivalent, since isblank()
@@ -362,6 +372,8 @@ CVS code -
 	- Document the smart home key option. (DLR)
 - nanorc.5:
 	- Document the smart home key option. (DLR)
+	- Document the whitespace option. (DLR, adapted from
+	  documentation by Mike Frysinger)
 - nano.texi:
 	- Fix toggle inaccuracies: Meta-L now toggles line wrapping, and
 	  Meta-< and Meta-> aren't toggles. (DLR)
@@ -375,6 +387,8 @@ CVS code -
 	- Add missing mouse entry, and update the nanorc sample regexes
 	  to account for the backupdir and mouse options. (DLR)
 	- Add smarthome description. (DLR)
+	- Document the whitespace option. (DLR, adapted from
+	  documentation by Mike Frysinger)
 - README.CVS:
 	- Increase the minimum required autoconf version to 2.54, and
 	  change the recommended automake version 1.7 to the minimum

doc/man/nanorc.5

@@ -135,6 +135,10 @@ Save automatically on exit, don't prompt.
 \fBset/unset view\fP
 Disallow file modification.
 .TP
+\fBset whitespace "\fIstring\fP"\fP
+Set the two characters used to display the first characters of tabs and
+spaces.  They cannot be control characters.
+.TP
 .B syntax "\fIstr\fP" ["\fIfileregex\fP" ... ]
 Defines a syntax named \fIstr\fP which can be activated via the \fB-Y\fP
 flag, or will be automatically activated if the current filename matches

doc/nanorc.sample

@@ -106,6 +106,10 @@
 ## Disallow file modification, why would you want this in an rc file? ;)
 # set view
 
+## The two characters used to display the first characters of tabs and
+## spaces.  ASCII 187 and ASCII 183 seem to be good values for these.
+# set whitespace "  "
+
 ## Color setup
 ## Format:
 ## syntax "short description" ["filename regex" ...]
@@ -215,7 +219,7 @@
 ## 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|smarthome|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|whitespace)"
 #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))?\>"

src/global.c

@@ -73,6 +73,11 @@ char *quotestr = NULL;		/* Quote string.  The default value is
 
 #ifndef NANO_SMALL
 char *backup_dir = NULL;	/* Backup directory. */
+#ifdef ENABLE_NANORC
+char *whitespace = NULL;	/* Characters used when displaying
+				   the first characters of tabs and
+				   spaces. */
+#endif
 #endif
 
 int resetstatuspos;		/* Hack for resetting the status bar 
@@ -238,11 +243,14 @@ void toggle_init(void)
 #ifndef DISABLE_WRAPPING
     char *toggle_wrap_msg;
 #endif
+#ifdef ENABLE_COLOR
+    char *toggle_syntax_msg;
+#endif
 #ifdef ENABLE_MULTIBUFFER
     char *toggle_multibuffer_msg;
 #endif
-#ifdef ENABLE_COLOR
+#ifdef ENABLE_NANORC
-    char *toggle_syntax_msg;
+    char *toggle_whitespace_msg;
 #endif
 
     /* There is no need to reinitialize the toggles.  They can't
@@ -273,6 +281,9 @@ void toggle_init(void)
 #ifdef ENABLE_MULTIBUFFER
     toggle_multibuffer_msg = _("Multiple file buffers");
 #endif
+#ifdef ENABLE_NANORC
+    toggle_whitespace_msg = _("Whitespace display");
+#endif
 
     toggle_init_one(TOGGLE_NOHELP_KEY, toggle_nohelp_msg, NO_HELP);
 #ifdef ENABLE_MULTIBUFFER
@@ -309,6 +320,9 @@ void toggle_init(void)
 #ifdef ENABLE_COLOR
     toggle_init_one(TOGGLE_SYNTAX_KEY, toggle_syntax_msg, COLOR_SYNTAX);
 #endif
+#ifdef ENABLE_NANORC
+    toggle_init_one(TOGGLE_WHITESPACE_KEY, toggle_whitespace_msg, WHITESPACE_DISPLAY);
+#endif
 }
 
 #ifdef DEBUG

src/nano.c

@@ -2959,6 +2959,11 @@ void do_toggle(const toggle *which)
     case TOGGLE_SYNTAX_KEY:
 	edit_refresh();
 	break;
+#endif
+#ifdef ENABLE_NANORC
+    case TOGGLE_WHITESPACE_KEY:
+	edit_refresh();
+	break;
 #endif
     }
 
@@ -3408,6 +3413,11 @@ int main(int argc, char *argv[])
     }
 #endif
 
+#if !defined(NANO_SMALL) && defined(ENABLE_NANORC)
+    if (whitespace == NULL)
+	whitespace = mallocstrcpy(NULL, "  ");
+#endif
+
     if (tabsize == -1)
 	tabsize = 8;
 

src/nano.h

@@ -282,6 +282,7 @@ typedef struct historyheadtype {
 #define HISTORYLOG		(1<<27)
 #define RESTRICTED		(1<<28)
 #define SMART_HOME		(1<<29)
+#define WHITESPACE_DISPLAY	(1<<30)
 
 /* Control key sequences, changing these would be very very bad. */
 #define NANO_CONTROL_SPACE 0
@@ -451,6 +452,7 @@ typedef struct historyheadtype {
 #define TOGGLE_BACKUP_KEY	NANO_ALT_B
 #define TOGGLE_SYNTAX_KEY	NANO_ALT_Y
 #define TOGGLE_SMARTHOME_KEY	NANO_ALT_H
+#define TOGGLE_WHITESPACE_KEY	NANO_ALT_P
 #endif /* !NANO_SMALL */
 
 #define MAIN_VISIBLE 12

src/proto.h

@@ -52,6 +52,9 @@ extern char *quotestr;
 
 #ifndef NANO_SMALL
 extern char *backup_dir;
+#ifdef ENABLE_NANORC
+extern char *whitespace;
+#endif
 #endif
 
 extern WINDOW *topwin, *edit, *bottomwin;

src/rcfile.c

@@ -90,6 +90,9 @@ const static rcoption rcopts[] = {
     {"tabsize", 0},
     {"tempfile", TEMP_OPT},
     {"view", VIEW_MODE},
+#ifndef NANO_SMALL
+    {"whitespace", 0},
+#endif
     {NULL, 0}
 };
 
@@ -148,12 +151,13 @@ char *parse_next_word(char *ptr)
     return ptr;
 }
 
-/* The keywords operatingdir, backupdir, fill, tabsize, speller, and
+/* The keywords operatingdir, backupdir, fill, tabsize, speller,
- * quotestr take an argument when set.  Among these, operatingdir,
+ * quotestr, and whitespace take an argument when set.  Among these,
- * backupdir, speller, and quotestr have to allow tabs and spaces in the
+ * operatingdir, backupdir, speller, quotestr, and whitespace have to
- * argument.  Thus, if the next word starts with a ", we say it ends
+ * allow tabs and spaces in the argument.  Thus, if the next word starts
- * with the last " of the line.  Otherwise, the word is interpreted as
+ * with a ", we say it ends with the last " of the line.  Otherwise, the
- * usual.  That is so the arguments can contain "s too. */
+ * word is interpreted as usual.  That is so the arguments can contain
+ * "s too. */
 char *parse_argument(char *ptr)
 {
     const char *ptr_bak = ptr;
@@ -545,6 +549,7 @@ void parse_rcfile(FILE *rcstream)
 #endif
 #ifndef NANO_SMALL
 			        || !strcasecmp(rcopts[i].name, "backupdir")
+				|| !strcasecmp(rcopts[i].name, "whitespace")
 #endif
 #ifndef DISABLE_SPELLER
 				|| !strcasecmp(rcopts[i].name, "speller")
@@ -592,6 +597,18 @@ void parse_rcfile(FILE *rcstream)
 			    if (!strcasecmp(rcopts[i].name, "backupdir"))
 				backup_dir = mallocstrcpy(NULL, option);
 			    else
+
+			    if (!strcasecmp(rcopts[i].name, "whitespace")) {
+				size_t ws_len;
+				whitespace = mallocstrcpy(NULL, option);
+				ws_len = strlen(whitespace);
+				if (ws_len != 2 || (ws_len == 2 && (is_cntrl_char(whitespace[0]) || is_cntrl_char(whitespace[1])))) {
+				    rcfile_error(_("Two non-control characters required"));
+				    free(whitespace);
+				    whitespace = NULL;
+				} else
+				    SET(WHITESPACE_DISPLAY);
+			    } else
 #endif
 #ifndef DISABLE_SPELLER
 			    if (!strcasecmp(rcopts[i].name, "speller"))

src/search.c

@@ -71,11 +71,18 @@ void regexp_cleanup(void)
 
 void not_found_msg(const char *str)
 {
-    int numchars = actual_x(str, COLS / 2);
+    char *disp;
+    int numchars;
  
     assert(str != NULL);
-    statusbar(_("\"%.*s%s\" not found"), numchars, str,
+
-	str[numchars] == '\0' ? "" : "...");
+    disp = display_string(str, 0, (COLS / 2) + 1);
+    numchars = strnlen(disp, COLS / 2);
+
+    statusbar(_("\"%.*s%s\" not found"), numchars, disp,
+	disp[numchars] == '\0' ? "" : "...");
+
+    free(disp);
 }
 
 void search_abort(void)

src/winio.c

@@ -1435,11 +1435,15 @@ char *display_string(const char *buf, size_t start_col, size_t len)
     index = 0;
 
     for (; index < alloc_len; buf++) {
-	if (*buf == '\t')
+	if (*buf == '\t') {
-	    do {
+	    converted[index++] =
+#if !defined(NANO_SMALL) && defined(ENABLE_NANORC)
+		ISSET(WHITESPACE_DISPLAY) ? whitespace[0] :
+#endif
+		' '; 
+	    while ((column + index) % tabsize)
 		converted[index++] = ' ';
-	    } while ((column + index) % tabsize);
+	} else if (is_cntrl_char(*buf)) {
-	else if (is_cntrl_char(*buf)) {
 	    converted[index++] = '^';
 	    if (*buf == '\n')
 		/* Treat newlines embedded in a line as encoded nulls;
@@ -1450,7 +1454,13 @@ char *display_string(const char *buf, size_t start_col, size_t len)
 		converted[index++] = '?';
 	    else
 		converted[index++] = *buf + 64;
-	} else
+	} else if (*buf == ' ')
+	    converted[index++] =
+#if !defined(NANO_SMALL) && defined(ENABLE_NANORC)
+		ISSET(WHITESPACE_DISPLAY) ? whitespace[1] :
+#endif
+		' ';
+	else
 	    converted[index++] = *buf;
     }
     assert(len <= alloc_len + column - start_col);
@@ -1996,10 +2006,18 @@ void statusbar(const char *msg, ...)
 	char *bar;
 	char *foo;
 	size_t start_x = 0, foo_len;
+#if !defined(NANO_SMALL) && defined(ENABLE_NANORC)
+	int old_whitespace = ISSET(WHITESPACE_DISPLAY);
+	UNSET(WHITESPACE_DISPLAY);
+#endif
 	bar = charalloc(COLS - 3);
 	vsnprintf(bar, COLS - 3, msg, ap);
 	va_end(ap);
 	foo = display_string(bar, 0, COLS - 4);
+#if !defined(NANO_SMALL) && defined(ENABLE_NANORC)
+	if (old_whitespace)
+	    SET(WHITESPACE_DISPLAY);
+#endif
 	free(bar);
 	foo_len = strlen(foo);
 	start_x = (COLS - foo_len - 4) / 2;