alpm: add new alpm_find_satisfier function

whatprovides and splitdep were removed, so depcmp alone is quite useless
now without splitdep, and deptest is not flexible enough.

Introduce a new alpm_find_satisfier which is hopefully more flexible,
this should make implementation of deptest very easy, and also help alpm
tools such as pactree.

Signed-off-by: Xavier Chantry <chantry.xavier@gmail.com>
Signed-off-by: Dan McGee <dan@archlinux.org>

2 files changed, 15 insertions, 0 deletions

diff --git a/lib/libalpm/alpm.h b/lib/libalpm/alpm.h
index 3dea6be9..123555fb 100644
--- a/lib/libalpm/alpm.h
+++ b/lib/libalpm/alpm.h
@@ -433,6 +433,7 @@ int alpm_depcmp(pmpkg_t *pkg, pmdepend_t *dep);
 alpm_list_t *alpm_checkdeps(alpm_list_t *pkglist, int reversedeps,
 		alpm_list_t *remove, alpm_list_t *upgrade);
 alpm_list_t *alpm_deptest(pmdb_t *db, alpm_list_t *targets);
+pmpkg_t *alpm_find_satisfier(alpm_list_t *pkgs, const char *depstring);
 
 const char *alpm_miss_get_target(const pmdepmissing_t *miss);
 pmdepend_t *alpm_miss_get_dep(pmdepmissing_t *miss);
diff --git a/lib/libalpm/deps.c b/lib/libalpm/deps.c
index 0d8683c2..b652b19a 100644
--- a/lib/libalpm/deps.c
+++ b/lib/libalpm/deps.c
@@ -202,6 +202,20 @@ pmpkg_t *_alpm_find_dep_satisfier(alpm_list_t *pkgs, pmdepend_t *dep)
 	return(NULL);
 }
 
+/** Find a package satisfying a specified dependency.
+ * The dependency can include versions with depmod operators.
+ * @param pkgs an alpm_list_t* of pmpkg_t where the satisfier will be searched
+ * @param depstring package or provision name, versioned or not
+ * @return a pmpkg_t* satisfying depstring
+ */
+pmpkg_t SYMEXPORT *alpm_find_satisfier(alpm_list_t *pkgs, const char *depstring)
+{
+	pmdepend_t *dep = _alpm_splitdep(depstring);
+	pmpkg_t *pkg = _alpm_find_dep_satisfier(pkgs, dep);
+	_alpm_dep_free(dep);
+	return(pkg);
+}
+
 /** Checks dependencies and returns missing ones in a list.
  * Dependencies can include versions with depmod operators.
  * @param db pointer to the local package database