xbps-alternatives(1): implemented -g <grp> -l.

NEWS

@@ -1,5 +1,8 @@
 xbps-0.49 (???):
 
+ * xbps-alternatives(1): -g <grp> -l now works. To only print all alternatives
+   associated with this group.
+
  * xbps-remove(1): this now will print the messages from alternatives.
 
  * alternatives: do not register duplicate alternative groups. Happened when

bin/xbps-alternatives/main.c

@@ -108,7 +108,7 @@ list_pkg_alternatives(xbps_dictionary_t pkgd, const char *group, bool print_key)
 }
 
 static int
-list_alternatives(struct xbps_handle *xhp, const char *pkgname)
+list_alternatives(struct xbps_handle *xhp, const char *pkgname, const char *grp)
 {
 	xbps_dictionary_t alternatives, pkgd;
 	xbps_array_t allkeys;
@@ -139,6 +139,9 @@ list_alternatives(struct xbps_handle *xhp, const char *pkgname)
 		keyname = xbps_dictionary_keysym_cstring_nocopy(keysym);
 		array = xbps_dictionary_get_keysym(alternatives, keysym);
 
+		if (grp && strcmp(grp, keyname))
+			continue;
+
 		printf("%s\n", keyname);
 		for (unsigned int x = 0; x < xbps_array_count(array); x++) {
 			const char *str;
@@ -247,7 +250,7 @@ main(int argc, char **argv)
 			rv = xbps_pkgdb_update(&xh, true, true);
 	} else if (list_mode) {
 		/* list alternative groups */
-		rv = list_alternatives(&xh, pkg);
+		rv = list_alternatives(&xh, pkg, group);
 	}
 
 	xbps_end(&xh);

bin/xbps-alternatives/xbps-alternatives.1

@@ -1,4 +1,4 @@
-.Dd October 30, 2015
+.Dd October 31, 2015
 .Dt XBPS-ALTERNATIVES 1
 .Sh NAME
 .Nm xbps-alternatives
@@ -43,9 +43,12 @@ Show the version information.
 .Sh MODE
 Only one of the following modes can be used at a time.
 .Bl -tag -width -x
-.It Fl l, Fl -list Op PKG
-Lists all current alternatives or only from
-.Ar PKG .
+.It Fl l, Fl -list Op PKG Op -g Ar group
+Lists all current alternative groups or only from
+.Ar PKG ,
+or just a specific group, if the
+.Fl g Fl -group
+option is set.
 .It Fl s, Fl -set Ar PKG Op -g Ar group
 Set alternative groups specified by
 .Ar PKG