From 559feb66618bbeca96ea5431522196d10951b378 Mon Sep 17 00:00:00 2001
From: Ricardo Wurmus <rekado@elephly.net>
Date: Sun, 17 Jan 2021 15:52:08 +0100
Subject: gnu: Add guile-libyaml.

* gnu/packages/guile-xyz.scm (guile-libyaml): New variable.
---
 gnu/packages/guile-xyz.scm | 70 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)

(limited to 'gnu')

diff --git a/gnu/packages/guile-xyz.scm b/gnu/packages/guile-xyz.scm
index 9775cc33f0..c2d853f006 100644
--- a/gnu/packages/guile-xyz.scm
+++ b/gnu/packages/guile-xyz.scm
@@ -82,6 +82,7 @@
   #:use-module (gnu packages linux)
   #:use-module (gnu packages man)
   #:use-module (gnu packages maths)
+  #:use-module (gnu packages mes)
   #:use-module (gnu packages multiprecision)
   #:use-module (gnu packages ncurses)
   #:use-module (gnu packages networking)
@@ -101,6 +102,7 @@
   #:use-module (gnu packages texinfo)
   #:use-module (gnu packages tls)
   #:use-module (gnu packages version-control)
+  #:use-module (gnu packages web)
   #:use-module (gnu packages webkit)
   #:use-module (gnu packages xdisorg)
   #:use-module (gnu packages xorg)
@@ -4430,6 +4432,74 @@ including parsing and code generation.")
      "Guile Shapefile is a Guile library for reading shapefiles.")
     (license license:expat)))
 
+(define-public guile-libyaml
+  (let ((commit "f5d33a6880e96571d3cb079ed7755ffc156cac46")
+        (revision "1"))
+    (package
+      (name "guile-libyaml")
+      (version (git-version "0" revision commit))
+      (source
+       (origin
+         (method git-fetch)
+         (uri (git-reference
+               (url "https://github.com/mwette/guile-libyaml")
+               (commit commit)))
+         (file-name (git-file-name name version))
+         (sha256
+          (base32
+           "12x91983fh1j39zy7kbk19acc1rqdh8515ddx1mh7l26j04k9wgq"))))
+      (build-system gnu-build-system)
+      (arguments
+       `(#:modules (((guix build guile-build-system)
+                     #:prefix guile:)
+                    ,@%gnu-build-system-modules)
+         #:imported-modules ((guix build guile-build-system)
+                             ,@%gnu-build-system-modules)
+         #:tests? #false ; there are none
+         #:phases
+         (modify-phases %standard-phases
+           (delete 'configure)
+           (add-after 'unpack 'remove-unused-files
+             (lambda* (#:key inputs #:allow-other-keys)
+               (for-each delete-file
+                         '("guix.scm" "demo1.yml" "demo1.scm"
+                           "yaml/libyaml.scm"
+                           ;; This file is mismatched with the generated FFI code.
+                           "yaml/ffi-help-rt.scm"))
+               (copy-file (string-append (assoc-ref inputs "nyacc")
+                                         "/share/guile/site/3.0/system/ffi-help-rt.scm")
+                          "yaml/ffi-help-rt.scm")
+               (substitute* "yaml/ffi-help-rt.scm"
+                 (("system ffi-help-rt") "yaml ffi-help-rt"))
+               #true))
+           (add-before 'build 'build-ffi
+             (lambda* (#:key inputs #:allow-other-keys)
+               (invoke "guild" "compile-ffi"
+                       "--no-exec" ; allow us to patch the generated file
+                       "yaml/libyaml.ffi")
+               (substitute* "yaml/libyaml.scm"
+                 (("system ffi-help-rt") "yaml ffi-help-rt")
+                 (("dynamic-link \"libyaml\"")
+                  (format #false "dynamic-link \"~a/lib/libyaml\""
+                          (assoc-ref inputs "libyaml"))))
+               #true))
+           (replace 'build
+             (assoc-ref guile:%standard-phases 'build))
+           (delete 'install))))
+      (inputs
+       `(("guile" ,guile-3.0)
+         ("libyaml" ,libyaml)))
+      (propagated-inputs
+       `(("guile-bytestructures" ,guile-bytestructures)))
+      (native-inputs
+       `(("nyacc" ,nyacc)))
+      (home-page "https://github.com/mwette/guile-libyaml")
+      (synopsis "Guile wrapper for libyaml")
+      (description
+       "This package provides a simple yaml module for Guile using the
+ffi-helper from nyacc.")
+      (license license:lgpl3+))))
+
 (define-public schmutz
   (let ((commit "add24588c59552537b8f1316df99a0cdd62c221e")
         (revision "1"))
-- 
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