07/44: haskell-build-system: register: Remove references to the doc output.

[guix-commits]

rekado pushed a commit to branch wip-haskell
in repository guix.

commit 3f7922cbf5f43418d0cb6d44ba4903f33db8ac61
Author: Ricardo Wurmus <rekado@elephly.net>
AuthorDate: Tue Jun 16 22:34:37 2020 +0200

    haskell-build-system: register: Remove references to the doc output.
    
    * guix/build/haskell-build-system.scm (register): Strip references to the 
doc
    output from the generated package config files; move the haddock files from
    the "doc" output to the "lib" output.
---
 guix/build/haskell-build-system.scm | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/guix/build/haskell-build-system.scm 
b/guix/build/haskell-build-system.scm
index 86681bb..d587962 100644
--- a/guix/build/haskell-build-system.scm
+++ b/guix/build/haskell-build-system.scm
@@ -244,6 +244,7 @@ given Haskell package."
              (loop seen tail))))))
 
   (let* ((out (assoc-ref outputs "out"))
+         (doc (assoc-ref outputs "doc"))
          (haskell  (assoc-ref inputs "haskell"))
          (name-verion (strip-store-file-name haskell))
          (lib (string-append (or (assoc-ref outputs "lib") out) "/lib"))
@@ -258,8 +259,25 @@ given Haskell package."
     ;; The conf file is created only when there is a library to register.
     (when (file-exists? config-file)
       (mkdir-p config-dir)
-      (let* ((config-file-name+id
-              (call-with-ascii-input-file config-file (cut grep id-rx <>))))
+      (let ((config-file-name+id
+             (call-with-ascii-input-file config-file (cut grep id-rx <>))))
+
+        ;; Remove reference to "doc" output from "lib" (or "out") by rewriting 
the
+        ;; "haddock-interfaces" field and removing the optional "haddock-html"
+        ;; field in the generated .conf file.
+        (when doc
+          (substitute* config-file
+            (("^haddock-html: .*") "\n")
+            (((format #f "^haddock-interfaces: ~a" doc))
+             (string-append "haddock-interfaces: " lib)))
+          ;; Move the referenced file to the "lib" (or "out") output.
+          (match (find-files doc "\\.haddock$")
+            ((haddock-file . rest)
+             (let* ((subdir (string-drop haddock-file (string-length doc)))
+                    (new    (string-append lib subdir)))
+               (mkdir-p (dirname new))
+               (rename-file haddock-file new)))
+            (_ #f)))
         (install-transitive-deps config-file %tmp-db-dir config-dir)
         (rename-file config-file
                      (string-append config-dir "/"