From 024480aca02a5a81113cdf7a47aafa4c1c30de3d Mon Sep 17 00:00:00 2001
From: Timo Teras <timo.teras@iki.fi>
Date: Tue, 14 Apr 2009 09:35:02 +0300
Subject: [PATCH] info: option '-r' to print "required by" info

---
 src/info.c | 114 +++++++++++++++++++++++++++++++++--------------------
 1 file changed, 71 insertions(+), 43 deletions(-)

diff --git a/src/info.c b/src/info.c
index 7bfc6b7..c7a05f8 100644
--- a/src/info.c
+++ b/src/info.c
@@ -17,10 +17,13 @@
 #include "apk_state.h"
 
 struct info_ctx {
-	int (*action)(struct apk_database *db, int argc, char **argv);
+	int (*action)(struct info_ctx *ctx, struct apk_database *db,
+		      int argc, char **argv);
+	void (*subaction)(struct apk_package *pkg);
 };
 
-static int info_list(struct apk_database *db, int argc, char **argv)
+static int info_list(struct info_ctx *ctx, struct apk_database *db,
+		     int argc, char **argv)
 {
 	struct apk_package *pkg;
 
@@ -35,7 +38,8 @@ static int info_list(struct apk_database *db, int argc, char **argv)
 	return 0;
 }
 
-static int info_exists(struct apk_database *db, int argc, char **argv)
+static int info_exists(struct info_ctx *ctx, struct apk_database *db,
+		       int argc, char **argv)
 {
 	struct apk_name *name;
 	int i, j;
@@ -56,7 +60,8 @@ static int info_exists(struct apk_database *db, int argc, char **argv)
 	return 0;
 }
 
-static int info_who_owns(struct apk_database *db, int argc, char **argv)
+static int info_who_owns(struct info_ctx *ctx, struct apk_database *db,
+			 int argc, char **argv)
 {
 	struct apk_package *pkg;
 	struct apk_dependency_array *deps = NULL;
@@ -88,6 +93,27 @@ static int info_who_owns(struct apk_database *db, int argc, char **argv)
 	return 0;
 }
 
+static int info_package(struct info_ctx *ctx, struct apk_database *db,
+			int argc, char **argv)
+{
+	struct apk_name *name;
+	int i, j;
+
+	for (i = 0; i < argc; i++) {
+		name = apk_db_query_name(db, APK_BLOB_STR(argv[i]));
+		if (name == NULL) {
+			apk_error("Not found: %s", name);
+			return 1;
+		}
+		for (j = 0; j < name->pkgs->num; j++) {
+			struct apk_package *pkg = name->pkgs->item[j];
+			if (apk_pkg_get_state(pkg) == APK_STATE_INSTALL)
+				ctx->subaction(pkg);
+		}
+	}
+	return 0;
+}
+
 static void info_print_contents(struct apk_package *pkg)
 {
 	struct apk_db_dir_instance *diri;
@@ -109,26 +135,6 @@ static void info_print_contents(struct apk_package *pkg)
 	puts("");
 }
 
-static int info_contents(struct apk_database *db, int argc, char **argv)
-{
-	struct apk_name *name;
-	int i, j;
-
-	for (i = 0; i < argc; i++) {
-		name = apk_db_query_name(db, APK_BLOB_STR(argv[i]));
-		if (name == NULL) {
-		 	apk_error("Not found: %s", name);
-			return 1;
-		}
-		for (j = 0; j < name->pkgs->num; j++) {
-			struct apk_package *pkg = name->pkgs->item[j];
-			if (apk_pkg_get_state(pkg) == APK_STATE_INSTALL)
-				info_print_contents(pkg);
-		}
-	}
-	return 0;
-}
-
 static void info_print_depends(struct apk_package *pkg)
 {
 	int i;
@@ -145,27 +151,42 @@ static void info_print_depends(struct apk_package *pkg)
 	puts("");
 }
 
-static int info_depends(struct apk_database *db, int argc, char **argv)
+static void info_print_required_by(struct apk_package *pkg)
 {
-	struct apk_name *name;
-	int i, j;
+	int i, j, k;
+	char *separator = apk_verbosity > 1 ? " " : "\n";
 
-	for (i = 0; i < argc; i++) {
-		name = apk_db_query_name(db, APK_BLOB_STR(argv[i]));
-		if (name == NULL) {
-		 	apk_error("Not found: %s", argv[i]);
-			return 1;
-		}
-		for (j = 0; j < name->pkgs->num; j++) {
-			struct apk_package *pkg = name->pkgs->item[j];
-			if (apk_pkg_get_state(pkg) == APK_STATE_INSTALL) 
-				info_print_depends(pkg);
+	if (apk_verbosity == 1)
+		printf("%s-%s is required by:\n", pkg->name->name, pkg->version);
+	if (pkg->name->rdepends == NULL)
+		return;
+	if (apk_verbosity > 1)
+		printf("%s: ", pkg->name->name);
+	for (i = 0; i < pkg->name->rdepends->num; i++) {
+		struct apk_name *name0 = pkg->name->rdepends->item[i];
+
+		/* Check only the package that is installed, and that
+		 * it actually has this package as dependency. */
+		if (name0->pkgs == NULL)
+			continue;
+		for (j = 0; j < name0->pkgs->num; j++) {
+			struct apk_package *pkg0 = name0->pkgs->item[j];
+
+			if (apk_pkg_get_state(pkg0) != APK_STATE_INSTALL ||
+			    pkg0->depends == NULL)
+				continue;
+			for (k = 0; k < pkg0->depends->num; k++) {
+				if (pkg0->depends->item[k].name != pkg->name)
+					continue;
+				printf("%s-%s%s", pkg0->name->name,
+				       pkg0->version, separator);
+				break;
+			}
 		}
 	}
-	return 0;
+	puts("");
 }
 
-
 static int info_parse(void *ctx, int optch, int optindex, const char *optarg)
 {
 	struct info_ctx *ictx = (struct info_ctx *) ctx;
@@ -178,10 +199,16 @@ static int info_parse(void *ctx, int optch, int optindex, const char *optarg)
 		ictx->action = info_who_owns;
 		break;
 	case 'L':
-		ictx->action = info_contents;
+		ictx->action = info_package;
+		ictx->subaction = info_print_contents;
 		break;
 	case 'R':
-		ictx->action = info_depends;
+		ictx->action = info_package;
+		ictx->subaction = info_print_depends;
+		break;
+	case 'r':
+		ictx->action = info_package;
+		ictx->subaction = info_print_required_by;
 		break;
 	default:
 		return -1;
@@ -199,9 +226,9 @@ static int info_main(void *ctx, int argc, char **argv)
 		return -1;
 
 	if (ictx->action != NULL)
-		r = ictx->action(&db, argc, argv);
+		r = ictx->action(ictx, &db, argc, argv);
 	else
-		r = info_list(&db, argc, argv);
+		r = info_list(ictx, &db, argc, argv);
 
 	apk_db_close(&db);
 	return r;
@@ -212,6 +239,7 @@ static struct option info_options[] = {
 	{ "installed",	no_argument,		NULL, 'e' },
 	{ "who-owns",	no_argument,		NULL, 'W' },
 	{ "depends",	no_argument,		NULL, 'R' },
+	{ "rdepends",	no_argument,		NULL, 'r' },
 };
 
 static struct apk_applet apk_info = {