util: improve the command line argument parsing in wmmenugen

The code ignored the last argument provided on the command line;

It did not support the recommended '--version' and '--help' from GNU which
are often handy;

It used an unusual syntax to specify the parser, now it can also use more
usual "-parser=name" and "-parser name", the old syntax is still supported
to avoid breaking compatibility;

When a problem is found with an argument, the program stops instead of
printing an error message and continuing;

There's been updates on the exit codes in case of problem because it is an
information that could be useful for people calling the program from a
script;

Took the opportunity to provide more information in the man page and to
get it cross-checked against the program's option list during "make check".

Signed-off-by: Christophe CURIS <christophe.curis@free.fr>

doc/Makefile.am

@@ -49,7 +49,7 @@ am__v_CHKOPTS_0 = @echo "  CHK      $@" ;
 am__v_CHKOPTS_1 =
 
 check-local: wmaker-args WPrefs-args wmagnify-args geticonset-args getstyle-args seticons-args setstyle-args \
-	wdread-args wdwrite-args wmgenmenu-args wmsetbg-args wxcopy-args wxpaste-args
+	wdread-args wdwrite-args wmgenmenu-args wmmenugen-args wmsetbg-args wxcopy-args wxpaste-args
 
 wmaker-args:
 	$(AM_V_CHKOPTS)$(top_srcdir)/script/check-cmdline-options-doc.sh \
@@ -91,6 +91,10 @@ wmgenmenu-args:
 	$(AM_V_CHKOPTS)$(top_srcdir)/script/check-cmdline-options-doc.sh \
 		--program "$(top_builddir)/util/wmgenmenu" --man-page "$(top_srcdir)/doc/wmgenmenu.1"
 
+wmmenugen-args:
+	$(AM_V_CHKOPTS)$(top_srcdir)/script/check-cmdline-options-doc.sh \
+		--program "$(top_builddir)/util/wmmenugen" --man-page "$(top_srcdir)/doc/wmmenugen.1"
+
 wmsetbg-args:
 	$(AM_V_CHKOPTS)$(top_srcdir)/script/check-cmdline-options-doc.sh \
 		--program "$(top_builddir)/util/wmsetbg" --man-page "wmsetbg.1"
@@ -104,4 +108,4 @@ wxpaste-args:
 		--program "$(top_builddir)/util/wxpaste" --man-page "$(top_srcdir)/doc/wxpaste.1"
 
 .PHONY: wmaker-args WPrefs-args wmagnify-args geticonset-args getstyle-args seticons-args setstyle-args \
-	wdread-args wdwrite-args wmgenmenu-args wmsetbg-args wxcopy-args wxpaste-args
+	wdread-args wdwrite-args wmgenmenu-args wmmenugen-args wmsetbg-args wxcopy-args wxpaste-args

doc/wmmenugen.1

@@ -1,22 +1,93 @@
-.TH "wmmenugen" "1" "15 August 2011"
+.TH "wmmenugen" "1" "16 May 2015"
 .SH "NAME"
 \fBwmmenugen\fR \- Window Maker PropList menu generator
 .PP
 .SH "SYNOPSIS"
-.B wmmenugen \fI\-parser:<parser> fspec \fR[ fpsec ... \fR]
-\fR[\fI\-parser:<parser> fspec \fR[ fpsec ... \fR] ... \fR]
-.PP
+.B wmmenugen
+.RI [ options ...]
+.BI \-parser= <name>
+.IR fspec " [" fspec "...]"
+.BI \fR[\fP\-parser= <name>
+.IR fspec " [" fspec "...]...]"
 .SH "DESCRIPTION"
-\fBwmmenugen \fR\- Window Maker PropList menu generator
-.PP
+.B wmmenugen
+generates a menu in the
+.I PropList
+format for Window Maker from the input file
+.IR fspec .
+In the case where
+.I fspec
+is a directory instead of a file, then
+.B wmmenugen
+will read all the files present in the hierarchy of this directory.
 .SH "OPTIONS"
 .TP
-.B \-parser
-\fRspecify the parser. Known parsers are xdg and wmconfig.
+.BR \-\-help ", " \-h
+print a help message with the list of options
 .TP
-.B \-fspec
-\fRspecify the file.
+.B \-parser
+specify the format of the file to be parsed
+.TP
+.B \-\-version
+print the version of Window Maker from which the program comes
+.SH "PARSERS"
+.B wmmenugen
+supports these file formats for input files:
+.TP
+.I wmconfig
+the format of the menu generation tool for X of the same name
+.TP
+.I xdg
+the format of the menu specification as defined by the
+.I FreeDesktop
+standard, currently at version 1.1
+.SH "RETURN VALUE"
+The exit status from the
+.B wmmenugen
+command provides information for the caller:
+.TP
+.B 0
+when the
+.I PropList
+menu was successfully generated on
+.IR stdout .
+.TP
+.B 1
+when a
+.I fspec
+caused a problem (non readable file, ...)
+.TP
+.B 2
+the arguments of the command line where not recognised
+.TP
+.B 3
+the program met an unexpected menu structure;
+you probably want to look at the section
+.B BUGS
+below.
+.SH "BUGS"
+If you get the exit status
+.B 3
+with the unclear error message about
+.IR "unprocessed levels on the stack" ,
+you encountered a limitation of
+.BR wmmenugen .
+It would be a good idea to prepare an archive with the files incriminated and submit them to the
+mailing list (wmaker-dev@lists.windowmaker.org) with you command line, so the team can work on
+improving the behaviour of the program on this case.
+.SH "SEE ALSO"
+.BR wmgenmenu (1),
+the tool to generate a default menu
 .PP
+the
+.I Wmconfig
+program can be found at:
+<http://www.arrishq.net/index.html>
+.PP
+the
+.I xdg
+specification can be found at:
+<http://standards.freedesktop.org/menu-spec/menu-spec-1.1.html>
 .SH "AUTHOR"
 wmmenugen is a part of Window Maker. It was written by Tamas TEVESZ.
 .PP

util/wmmenugen.c

@@ -28,6 +28,7 @@
 #include <string.h>
 #include <strings.h>
 #include <unistd.h>
+#include <errno.h>
 
 #include "wmmenugen.h"
 
@@ -54,6 +55,35 @@ static const char *prog_name;
 WMTreeNode *menu;
 char *env_lang, *env_ctry, *env_enc, *env_mod;
 
+static void print_help(void)
+{
+	printf("Usage: %s -parser:<parser> fspec [fspec...]\n", prog_name);
+	puts("Dynamically generate a menu in Property List format for Window Maker");
+	puts("");
+	puts("  -h, --help\t\tdisplay this help and exit");
+	puts("  -parser=<name>\tspecify the format of the input, see below");
+	puts("  --version\t\toutput version information and exit");
+	puts("");
+	puts("fspec: the file to be converted or the directory containing all the menu files");
+	puts("");
+	puts("Known parsers:");
+	puts("  xdg\t\tDesktop Entry from FreeDesktop standard");
+	puts("  wmconfig\tfrom the menu generation tool by the same name");
+}
+
+#ifdef DEBUG
+static const char *get_parser_name(void)
+{
+	if (parse == &parse_xdg)
+		return "xdg";
+	if (parse == &parse_wmconfig)
+		return "wmconfig";
+
+	/* This case is not supposed to happen, but if it does it means that someone to update this list */
+	return "<unknown>";
+}
+#endif
+
 int main(int argc, char **argv)
 {
 	struct stat st;
@@ -76,45 +106,69 @@ int main(int argc, char **argv)
 	parse_locale(NULL, &env_lang, &env_ctry, &env_enc, &env_mod);
 	terminal = find_terminal_emulator();
 
-	if (argc < 3) {
-		fprintf(stderr, "Usage: %s -parser:<parser> fspec [fpsec...] "
-			"[-parser:<parser> fspec [fpsec...]...]\n", prog_name);
-		fputs(  "Known parsers: xdg wmconfig\n", stderr);
-		return 1;
-	}
-
-	for (i = 1; i < argc; i++)
+	for (i = 1; i <= argc; i++)
 	{
-		if (strncmp(argv[i], "-parser:", 8) == 0) {
-			if (strcmp(argv[i] + 8, "xdg") == 0) {
-#if DEBUG
-				fputs("Using parser \"xdg\"\n", stderr);
-#endif
+		if (strncmp(argv[i], "-parser", 7) == 0 &&
+		    (argv[i][7] == '=' ||
+		     argv[i][7] == ':' || /* for legacy compatibility */
+		     argv[i][7] == '\0')) {
+			const char *name;
+
+			if (argv[i][7] == '\0') {
+				if (++i > argc) {
+					fprintf(stderr, "%s: Missing parser name after \"-parser\"\n", prog_name);
+					return 2;
+				}
+				name = argv[i];
+			} else {
+				name = argv[i] + 8;
+			}
+
+			if (strcmp(name, "xdg") == 0) {
 				parse = &parse_xdg;
-			} else if (strcmp(argv[i] + 8, "wmconfig") == 0) {
-#if DEBUG
-				fputs("Using parser \"wmconfig\"\n", stderr);
-#endif
+			} else if (strcmp(name, "wmconfig") == 0) {
 				parse = &parse_wmconfig;
 				validateFilename = &wmconfig_validate_file;
 			} else {
-				fprintf(stderr, "%s: Unknown parser \"%s\"\n", prog_name, argv[i] + 8);
+				fprintf(stderr, "%s: Unknown parser \"%s\"\n", prog_name, name);
+				return 2;
 			}
 			continue;
 		}
 
-		if (parse) {
-			if (stat(argv[i], &st) == -1) {
-				fprintf(stderr, "%s: unable to stat \"%s\"\n", prog_name, argv[i]);
-			} else if (S_ISREG(st.st_mode)) {
-				parse(argv[i], addWMMenuEntryCallback);
-			} else if (S_ISDIR(st.st_mode)) {
-				nftw(argv[i], dirParseFunc, 16, FTW_PHYS);
-			} else {
-				fprintf(stderr, "%s: \"%s\" is not a file or directory\n", prog_name, argv[i]);
-			}
-		} else {
+		if (strcmp(argv[i], "--version") == 0) {
+			printf("%s (Window Maker %s)\n", prog_name, VERSION);
+			return 0;
+		}
+
+		if (strcmp(argv[i], "-h") == 0 ||
+		    strcmp(argv[i], "-help") == 0 ||
+		    strcmp(argv[i], "--help") == 0) {
+			print_help();
+			return 0;
+		}
+
+		if (parse == NULL) {
 			fprintf(stderr, "%s: argument \"%s\" with no valid parser\n", prog_name, argv[i]);
+			return 2;
+		}
+
+#if DEBUG
+		fprintf(stderr, "%s: Using parser \"%s\" to process \"%s\"\n",
+		        prog_name, get_parser_name(), argv[i]);
+#endif
+
+		if (stat(argv[i], &st) == -1) {
+			fprintf(stderr, "%s: unable to stat \"%s\", %s\n",
+			        prog_name, argv[i], strerror(errno));
+			return 1;
+		} else if (S_ISREG(st.st_mode)) {
+			parse(argv[i], addWMMenuEntryCallback);
+		} else if (S_ISDIR(st.st_mode)) {
+			nftw(argv[i], dirParseFunc, 16, FTW_PHYS);
+		} else {
+			fprintf(stderr, "%s: \"%s\" is not a file or directory\n", prog_name, argv[i]);
+			return 1;
 		}
 	}
 
@@ -129,16 +183,17 @@ int main(int argc, char **argv)
 	i = WMGetArrayItemCount(plMenuNodes);
 	if (i > 2) { /* more than one submenu unprocessed is almost certainly an error */
 		fprintf(stderr, "%s: unprocessed levels on the stack. fishy.\n", prog_name);
-		return 1;
+		return 3;
 	} else if (i > 1 ) { /* possibly the top-level attachment is not yet done */
 		WMPropList *first, *next;
+
 		next = WMPopFromArray(plMenuNodes);
 		first = WMPopFromArray(plMenuNodes);
 		WMAddToPLArray(first, next);
 		WMAddToArray(plMenuNodes, first);
 	}
 
-	printf("%s\n", WMGetPropListDescription((WMPropList *)WMGetFromArray(plMenuNodes, 0), True));
+	puts(WMGetPropListDescription((WMPropList *)WMGetFromArray(plMenuNodes, 0), True));
 
 	return 0;
 }