diff options
Diffstat (limited to 'guix/scripts/graph.scm')
| -rw-r--r-- | guix/scripts/graph.scm | 46 |
1 files changed, 41 insertions, 5 deletions
diff --git a/guix/scripts/graph.scm b/guix/scripts/graph.scm index d69dace14f..1d5db3b3cb 100644 --- a/guix/scripts/graph.scm +++ b/guix/scripts/graph.scm @@ -457,6 +457,29 @@ package modules, while attempting to retain user package modules." ;;; +;;; Displaying a path. +;;; + +(define (display-path node1 node2 type) + "Display the shortest path from NODE1 to NODE2, of TYPE." + (mlet %store-monad ((path (shortest-path node1 node2 type))) + (define node-label + (let ((label (node-type-label type))) + ;; Special-case derivations and store items to print them in full, + ;; contrary to what their 'node-type-label' normally does. + (match-lambda + ((? derivation? drv) (derivation-file-name drv)) + ((? string? str) str) + (node (label node))))) + + (if path + (format #t "~{~a~%~}" (map node-label path)) + (leave (G_ "no path from '~a' to '~a'~%") + (node-label node1) (node-label node2))) + (return #t))) + + +;;; ;;; Command-line options. ;;; @@ -465,6 +488,9 @@ package modules, while attempting to retain user package modules." (lambda (opt name arg result) (alist-cons 'node-type (lookup-node-type arg) result))) + (option '("path") #f #f + (lambda (opt name arg result) + (alist-cons 'path? #t result))) (option '("list-types") #f #f (lambda (opt name arg result) (list-node-types) @@ -511,6 +537,8 @@ Emit a representation of the dependency graph of PACKAGE...\n")) (display (G_ " --list-types list the available graph types")) (display (G_ " + --path display the shortest path between the given nodes")) + (display (G_ " -e, --expression=EXPR consider the package EXPR evaluates to")) (display (G_ " -s, --system=SYSTEM consider the graph for SYSTEM--e.g., \"i686-linux\"")) @@ -566,11 +594,19 @@ Emit a representation of the dependency graph of PACKAGE...\n")) (mlet %store-monad ((_ (set-grafting #f)) (nodes (mapm %store-monad (node-type-convert type) - items))) - (export-graph (concatenate nodes) - (current-output-port) - #:node-type type - #:backend backend)) + (reverse items)))) + (if (assoc-ref opts 'path?) + (match nodes + (((node1 _ ...) (node2 _ ...)) + (display-path node1 node2 type)) + (_ + (leave (G_ "'--path' option requires exactly two \ +nodes (given ~a)~%") + (length nodes)))) + (export-graph (concatenate nodes) + (current-output-port) + #:node-type type + #:backend backend))) #:system (assq-ref opts 'system))))) #t) |