From f408d8d636ac24d576e9ee91a6c823e0874386ef Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ludovic=20Court=C3=A8s?= <ludo@gnu.org>
Date: Mon, 25 May 2020 17:33:04 +0200
Subject: [PATCH] self: Optimize 'file-append*' for 'local-file?'.

* guix/self.scm (file-append*): Add 'local-file?' case.
* guix/gexp.scm (local-file-select?): Export.
---
 guix/gexp.scm |  1 +
 guix/self.scm | 10 +++++++++-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/guix/gexp.scm b/guix/gexp.scm
index 9e193c76c4..510a1d54c3 100644
--- a/guix/gexp.scm
+++ b/guix/gexp.scm
@@ -51,6 +51,7 @@
             local-file-absolute-file-name
             local-file-name
             local-file-recursive?
+            local-file-select?
 
             plain-file
             plain-file?
diff --git a/guix/self.scm b/guix/self.scm
index a9568049b2..60fe6e6b01 100644
--- a/guix/self.scm
+++ b/guix/self.scm
@@ -213,7 +213,15 @@ record with the new file name."
      ;; itself.
      (local-file (string-append item "/" file)
                  #:recursive? recursive?))
-    ;; TODO: Add 'local-file?' case.
+    ((? local-file? base)
+     ;; Likewise, but with a <local-file>.
+     (if (local-file-recursive? base)
+         (local-file (string-append (local-file-absolute-file-name base)
+                                    "/" file)
+                     (basename file)
+                     #:recursive? recursive?
+                     #:select? (local-file-select? base))
+         (file-append base file)))
     (_
      ;; In this case, anything that refers to the result also depends on ITEM,
      ;; which isn't great.