xbps-install: add additional actions to the column output.

- downgrade if new version in repos is less than installed one.
- reinstall if both versions are equal.

and additionally always print installed pkg version, irrespectively of
the transaction mode.

Close #72

NEWS

@@ -1,5 +1,9 @@
 xbps-0.44 (???):
 
+ * xbps-install(8): add additional actions to the column output: "downgrade"
+   and "reinstall", as well as current installed version and new version.
+   Implement https://github.com/voidlinux/xbps/issues/72
+
  * libxbps: add packages on hold mode to the transaction, but just ignore them.
    This way those are shown in the xbps-install(8) output and the user really
    knows that there's a pending update that is not being applied.

bin/xbps-install/util.c

@@ -144,16 +144,19 @@ print_trans_colmode(struct transaction *trans, int cols)
 		if (dload) {
 			trans->dl_pkgcnt++;
 		}
-		if ((strcmp(tract, "update") == 0) ||
-		    (strcmp(tract, "hold") == 0) ||
-		    (strcmp(tract, "remove") == 0)) {
 		ipkgd = xbps_pkgdb_get_pkg(trans->xhp, pkgname);
-			assert(ipkgd);
+		if (ipkgd) {
 			xbps_dictionary_get_cstring_nocopy(ipkgd, "pkgver", &ipkgver);
 			iver = xbps_pkg_version(ipkgver);
 		}
 		ver = xbps_pkg_version(pkgver);
-
+		if (iver) {
+			int rv = xbps_cmpver(iver, ver);
+			if (rv == 1)
+				tract = "downgrade";
+			else if (rv == 0)
+				tract = "reinstall";
+		}
 		/* print pkgname and some blanks */
 		blen = pnamelen - strlen(pkgname);
 		printf("%s", pkgname);