graph: Allow store file names for 'derivation' and 'references' graphs.

* guix/scripts/graph.scm (%derivation-node-type)[convert]: Add
'derivation-path?' and catch-all clauses.
(%reference-node-type)[convert]: Add 'store-path?' and catch-all
clauses.
(assert-package, nodes-from-package): New procedures.
(%package-node-type, %bag-node-type,%bag-with-origins-node-type)
(%bag-emerged-node-type): Add 'convert' field
(guix-graph): Rename 'packages' to 'items' and
allow 'store-path?' arguments.
* guix/graph.scm (<node-type>)[convert]: Adjust comment.
* doc/guix.texi (Invoking guix graph): Document it.

1 files changed, 17 insertions, 1 deletions

diff --git a/tests/guix-graph.sh b/tests/guix-graph.sh
index 4d5a755bc10..1ec99706fd0 100644
--- a/tests/guix-graph.sh
+++ b/tests/guix-graph.sh
@@ -1,5 +1,5 @@
 # GNU Guix --- Functional package management for GNU
-# Copyright © 2015 Ludovic Courtès <ludo@gnu.org>
+# Copyright © 2015, 2016 Ludovic Courtès <ludo@gnu.org>
 #
 # This file is part of GNU Guix.
 #
@@ -20,6 +20,10 @@
 # Test the 'guix graph' command-line utility.
 #
 
+tmpfile1="t-guix-graph1-$$"
+tmpfile2="t-guix-graph2-$$"
+trap 'rm -f "$tmpfile1" "$tmpfile2"' EXIT
+
 guix graph --version
 
 for package in guile-bootstrap coreutils python
@@ -37,3 +41,15 @@ guix graph -e '(@ (gnu packages bootstrap) %bootstrap-guile)' \
     | grep guile-bootstrap
 
 if guix graph -e +; then false; else true; fi
+
+# Try passing store file names.
+
+guix graph -t references guile-bootstrap > "$tmpfile1"
+guix graph -t references `guix build guile-bootstrap` > "$tmpfile2"
+cmp "$tmpfile1" "$tmpfile2"
+
+# XXX: Filter the file names in the graph to work around the fact that we get
+# a mixture of relative and absolute file names.
+guix graph -t derivation coreutils > "$tmpfile1"
+guix graph -t derivation `guix build -d coreutils` > "$tmpfile2"
+cmp "$tmpfile1" "$tmpfile2"