Initial version of nixBufferBuilders.withPackages.

This builds elisp to setup an emacs buffer with the packages given
available. See shlevy/nix-buffer for more information.

Currently only modifies $PATH.

1 files changed, 20 insertions, 0 deletions

diff --git a/pkgs/build-support/emacs/buffer.nix b/pkgs/build-support/emacs/buffer.nix
new file mode 100644
index 00000000000..2f7f536d5e7
--- /dev/null
+++ b/pkgs/build-support/emacs/buffer.nix
@@ -0,0 +1,20 @@
+# Functions to build elisp files to locally configure emcas buffers.
+# See https://github.com/shlevy/nix-buffer
+
+{ runCommand }:
+
+{
+  withPackages = pkgs: runCommand "dir-locals.el" { inherit pkgs; } ''
+    echo        "(make-local-variable 'process-environment)" >> $out
+    echo        "(setenv \"PATH\" (concat" >> $out
+    for pkg in $pkgs; do
+      echo        "                \"$pkg/bin:$pkg/sbin\"" >> $out
+    done
+    echo          "                (getenv \"PATH\")))" >> $out
+    echo -n       "(setq-local exec-path (append '(" >> $out
+    for pkg in $pkgs; do
+      echo -en  "\n                                \"$pkg/bin\" \"$pkg/sbin\"" >> $out
+    done
+    echo -e   ")\\n                              exec-path))" >> $out
+  '';
+}