diff options
Diffstat (limited to 'guix')
| -rw-r--r-- | guix/scripts/graph.scm | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/guix/scripts/graph.scm b/guix/scripts/graph.scm index d96df5fbaf..79ce503a2e 100644 --- a/guix/scripts/graph.scm +++ b/guix/scripts/graph.scm @@ -37,6 +37,7 @@ #:use-module (srfi srfi-37) #:use-module (ice-9 match) #:export (%package-node-type + %reverse-package-node-type %bag-node-type %bag-with-origins-node-type %bag-emerged-node-type @@ -103,6 +104,25 @@ name." ;;; +;;; Reverse package DAG. +;;; + +(define %reverse-package-node-type + ;; For this node type we first need to compute the list of packages and the + ;; list of back-edges. Since we want to do it only once, we use the + ;; promises below. + (let* ((packages (delay (fold-packages cons '()))) + (back-edges (delay (run-with-store #f ;store not actually needed + (node-back-edges %package-node-type + (force packages)))))) + (node-type + (inherit %package-node-type) + (name "reverse-package") + (description "the reverse DAG of packages") + (edges (lift1 (force back-edges) %store-monad))))) + + +;;; ;;; Package DAG using bags. ;;; @@ -323,6 +343,7 @@ substitutes." (define %node-types ;; List of all the node types. (list %package-node-type + %reverse-package-node-type %bag-node-type %bag-with-origins-node-type %bag-emerged-node-type |