direnv: Add basic flake and direnv setup

Signed-off-by: Daniel Silverstone <dsilvers@digital-scurf.org>

1 files changed, 37 insertions, 0 deletions

diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..c19f3bc
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,37 @@
+# This is a nix "flake" which is used both by `direnv` and to offer
+# a quick way to acquire `subplot` in a nix/nixos environment.
+# If you have `direnv` support, just allow this tree and you should
+# be able to develop `subplot`.  If you use this as a package flake
+# then the `subplot` package derivation is available in the usual way
+
+{
+  inputs = { flake-utils.url = "github:numtide/flake-utils"; };
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = nixpkgs.legacyPackages.${system};
+        test-python-packages = python-packages:
+          with python-packages;
+          [ requests ];
+
+      in {
+        devShell = pkgs.mkShell {
+          buildInputs = with pkgs; [
+            stdenv
+            graphviz
+            plantuml
+            pandoc
+            texlive.combined.scheme-medium
+            daemonize
+            librsvg
+            (python3.withPackages test-python-packages)
+          ];
+          shellHook = ''
+            export SUBPLOT_DOT_PATH=${pkgs.graphviz}/bin/dot
+            export SUBPLOT_JAVA_PATH=${pkgs.jre}/bin/java
+            export SUBPLOT_PLANTUML_JAR_PATH=${pkgs.plantuml}/lib/plantuml.jar
+          '';
+        };
+      });
+}