[RFA] Improve help set/unset/show substitute-path

[Joel Brobecker <brobecker@adacore.com>]

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Hello,

As promised to Daniel, hopefully the following patch will make the help
text of the vaious substitute-path commands a bit better. Anyone either
wanting to refresh his memory about the usage should now be able to
use the help text for that. It's also easier to use the command without
having read the documentation.

2007-01-12  Joel Brobecker  <brobecker@adacore.com>

        * source.c (_initialize_source): Improve the help text of
        the substitute-path commands.

Tested on x86-linux, no regression.
OK to commit?

Thanks,
-- 
Joel

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Index: source.c
===================================================================
RCS file: /cvs/src/src/gdb/source.c,v
retrieving revision 1.76
diff -u -p -r1.76 source.c
--- source.c	8 Aug 2006 22:06:06 -0000	1.76
+++ source.c	12 Jan 2007 06:32:06 -0000
@@ -1997,16 +2007,26 @@ Show number of source lines gdb will lis
 
   add_cmd ("substitute-path", class_files, set_substitute_path_command,
            _("\
-Add a source path substitution rule.  If a substitution rule was previously\n\
-set, it is overridden."), &setlist);
+set substitute-path FROM TO\n\
+Add a source path substitution rule replacing FROM into TO in source paths.\n\
+If a substitution rule was previously set for FROM, the old rule is replaced\n\
+by the new one."),
+           &setlist);
 
   add_cmd ("substitute-path", class_files, unset_substitute_path_command,
            _("\
-Remove the current source path substitution rule.  This has no effect\n\
-if no path substitution rule was previously specified."),
+unset substitute-path [FROM]\n\
+If a path is specified (FROM), delete the associated rule from the current\n\
+list of substitution rules.  A warning is emmitted by the debugger if\n\
+no rule could be found.\n\
+If no path is specified, then all substitution rules are deleted."),
            &unsetlist);
 
   add_cmd ("substitute-path", class_files, show_substitute_path_command,
-           _("Show the current source path substitution rule."),
+           _("\
+show substitute-path [FROM]\n\
+If a path is specified (FROM), print the source path substitution rule which\n\
+would rewrite that path.\n\
+If no path is specified, print all source path substitution rules."),
            &showlist);
 }