diagnostics: Factorize 'absolute-location'.

* guix/scripts/style.scm (absolute-location): Move to...
* guix/diagnostics.scm (absolute-location): ... here.
* guix/upstream.scm (update-package-source): Use it.

1 files changed, 19 insertions, 1 deletions

diff --git a/guix/diagnostics.scm b/guix/diagnostics.scm
index 9f0d558f2f..3f1f527b43 100644
--- a/guix/diagnostics.scm
+++ b/guix/diagnostics.scm
@@ -1,5 +1,5 @@
 ;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2012-2021, 2023 Ludovic Courtès <ludo@gnu.org>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -36,6 +36,7 @@
             location-file
             location-line
             location-column
+            absolute-location
             source-properties->location
             location->source-properties
             location->string
@@ -340,6 +341,23 @@ number of arguments in ARGS matches the escapes in FORMAT."
               (&formatted-message (format str)
                                   (arguments (list args ...))))))))))
 
+(define (absolute-location loc)
+  "Replace the file name in LOC by an absolute location."
+  (location (if (string-prefix? "/" (location-file loc))
+                (location-file loc)
+
+                ;; 'search-path' might return #f in obscure cases, such as
+                ;; when %LOAD-PATH includes "." or ".." and LOC comes from a
+                ;; file in a subdirectory thereof.
+                (match (search-path %load-path (location-file loc))
+                  (#f
+                   (raise (formatted-message
+                           (G_ "file '~a' not found on load path")
+                           (location-file loc))))
+                  (str str)))
+            (location-line loc)
+            (location-column loc)))
+
 
 (define guix-warning-port
   (make-parameter (current-warning-port)))