add piston nix pkg for emacs

packages/emacs/27.1.0/build.sh

@@ -1,24 +0,0 @@
-#!/bin/bash
-
-export PATH=$PWD/bin:$PATH
-
-PREFIX=$(realpath $(dirname $0))
-
-mkdir -p build
-
-cd build
-
-# Emacs version 27.1 supports Docker builds
-# Otherwise, older versions will work too, but you will have to disable `/proc/sys/kernel/randomize_va_space` which is less secure
-curl -L "http://ftpmirror.gnu.org/emacs/emacs-27.1.tar.gz" -o emacs.tar.gz
-tar xzf emacs.tar.gz --strip-components=1
-rm emacs.tar.gz
-
-# Building without all that X11 stuff
-./configure --prefix="$PREFIX" --with-x=no --with-x-toolkit=no --with-xpm=no --with-jpeg=no --with-png=no --with-gif=no --with-tiff=no --with-gnutls=no
-make -j$(nproc)
-make install -j$(nproc)
-
-cd ..
-
-rm -rf build

packages/emacs/27.1.0/environment

@@ -1,4 +0,0 @@
-#!/usr/bin/env bash
-
-# Put 'export' statements here for environment variables
-export PATH=$PWD/bin:$PATH

packages/emacs/27.1.0/metadata.json

@@ -1,5 +0,0 @@
-{
-    "language": "emacs",
-    "version": "27.1.0",
-    "aliases": ["emacs", "el", "elisp"]
-}

packages/emacs/27.1.0/run

@@ -1,4 +0,0 @@
-#!/bin/bash
-
-# Put instructions to run the runtime
-emacs -Q --script "$@"

packages/emacs/27.1.0/test.el

@@ -1 +0,0 @@
-(princ "OK")

runtimes/default.nix

@@ -50,4 +50,5 @@ args: {
     "gcc-d" = import ./gcc-d.nix args;
     "gcc-fortran" = import ./gcc-fortran.nix args;
     "yabasic" = import ./yabasic.nix args;
+    "emacs" = import ./emacs.nix args;
 }

runtimes/emacs.nix

@@ -0,0 +1,30 @@
+{pkgs, piston, ...}:
+let
+    pkg = pkgs.emacs-nox;
+in piston.mkRuntime {
+    language = "emacs";
+    version = pkg.version;
+
+    aliases = [
+        "el"
+        "elisp"
+    ];
+
+    run = ''
+        ${pkg}/bin/emacs -Q --script "$@"
+    '';
+
+    tests = [
+        (piston.mkTest {
+            files = {
+                "test.el" = ''
+                    (princ "OK")
+                '';
+            };
+            args = [];
+            stdin = "";
+            packages = [];
+            main = "test.el";
+        })
+    ];
+}