[bug#37411] [PATCH] gnu: Add fennel.

[Alex ter Weele <alex.ter.weele@gmail.com>]

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Some limitations:

(require "fennelview") – i.e. requiring the library distributed with the
language – does not work. I spoke with members of freenode's #fennel and
a FENNEL_PATH could be added. In a future package definition,
wrap-program would set that variable. In the meantime, this can be
worked around:

         fennel --add-fennel-path "$(guix build fennel )/share/?.fnl"

No native readline support. I have decided not to package
https://luarocks.org/modules/peterbillam/readline as fennel 0.2.1's use
of readline does not give more functionality than rlwrap.


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From 08efecbbd181cc7db0c008b9740bc95ea2f78472 Mon Sep 17 00:00:00 2001
From: Alex ter Weele <alex.ter.weele@gmail.com>
Date: Sat, 7 Sep 2019 16:18:38 -0500
Subject: [PATCH] gnu: Add fennel.

* gnu/packages/fennel.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add fennel.scm.
---
 gnu/local.mk            |  1 +
 gnu/packages/fennel.scm | 62 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 63 insertions(+)
 create mode 100644 gnu/packages/fennel.scm

diff --git a/gnu/local.mk b/gnu/local.mk
index b7a5ef825b..84bfc8df2c 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -176,6 +176,7 @@ GNU_SYSTEM_MODULES =				\
   %D%/packages/erlang.scm			\
   %D%/packages/fabric-management.scm		\
   %D%/packages/fcitx.scm			\
+  %D%/packages/fennel.scm			\
   %D%/packages/figlet.scm			\
   %D%/packages/file.scm				\
   %D%/packages/file-systems.scm			\
diff --git a/gnu/packages/fennel.scm b/gnu/packages/fennel.scm
new file mode 100644
index 0000000000..a5c8ba756d
--- /dev/null
+++ b/gnu/packages/fennel.scm
@@ -0,0 +1,62 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2019 Alex ter Weele <alex.ter.weele@gmail.com>
+
+(define-module (gnu packages fennel)
+  #:use-module (gnu packages lua)
+  #:use-module (guix packages)
+  #:use-module (guix build-system gnu)
+  #:use-module (guix git-download)
+  #:use-module ((guix licenses) #:prefix license:))
+
+(define-public fennel
+  (package
+    (name "fennel")
+    (version "0.2.1")
+    (source (origin
+              (method git-fetch)
+              (uri (git-reference
+                    (url "https://github.com/bakpakin/Fennel.git")
+                    (commit version)))
+              (file-name (git-file-name name version))
+              (sha256
+               (base32
+                "1yn2lyfcrsjcx60lxy0xcyl2rfk4r5pydbkcblpikpk6vhr10ws0"))))
+    (build-system gnu-build-system)
+    (arguments
+     `(#:test-target "test"
+       #:phases
+       (modify-phases %standard-phases
+         (delete 'configure)
+         (delete 'build)
+         (replace 'install
+           (lambda _
+             (let* ((out (assoc-ref %outputs "out"))
+                    (data (string-append out "/share/"))
+                    (bin (string-append out "/bin/")))
+               (copy-recursively (assoc-ref %build-inputs "source") data)
+               (install-file "fennel" bin)
+               (wrap-program (string-append bin "fennel")
+                 `("LUA_PATH" ":" prefix (,(string-append data "?.lua"))))))))))
+    (inputs
+     `(("lua" ,lua)))
+    (home-page "https://fennel-lang.org/")
+    (synopsis "Lua lisp language")
+    (description "Fennel is a programming language that brings together the
+speed, simplicity, and reach of Lua with the flexibility of a lisp syntax and
+macro system.
+
+    * Full Lua compatibility: Easily call any Lua function or library from
+Fennel and vice-versa.
+
+    * Zero overhead: Compiled code should be just as or more efficient than
+hand-written Lua.
+
+    * Compile-time macros: Ship compiled code with no runtime dependency on
+Fennel.
+
+    * Embeddable: Fennel is a one-file library as well as an executable.
+Embed it in other programs to support runtime extensibility and interactive
+development.
+
+Anywhere you can run Lua code, you can run Fennel code.")
+    (license license:x11)))
-- 
2.23.0