Add nix flake and clj-build framework for CI

README.md

@@ -256,6 +256,20 @@ update the `deps.edn` from the project root is:
 
 `clj -A:depify | clj -A:zprint > deps.edn.tmp ; mv deps.edn.tmp deps.edn`
 
+# Development environment using nix
+
+For a reproducible development environment, `geo` provides a `flake.nix`.
+
+On a machine with nix installed:
+
+``` bash
+$ nix develop
+...
+
+$ clj -T:build ci
+$ clj -T:build install
+```
+
 # License
 
 This project and many of its dependencies are licensed under the Eclipse Public

deps.edn

@@ -9,7 +9,11 @@
                        com.fasterxml.jackson.dataformat/jackson-dataformat-smile #:mvn{:version "2.10.2"},
                        criterium #:mvn{:version "0.4.6"},
                        midje #:mvn{:version "1.10.5"},
-                       org.clojure/clojure #:mvn{:version "1.10.3"}}}},
+                       org.clojure/clojure #:mvn{:version "1.10.3"}}
+           :main-opts ["-m"]}
+    :build {:deps {io.github.seancorfield/build-clj
+                   {:git/tag "v0.6.7" :git/sha "22c2d09"}}
+            :ns-default build}}
  :deps {ch.hsr/geohash #:mvn{:version "1.4.0"},
         com.uber/h3 #:mvn{:version "3.7.1"},
         org.clojure/math.numeric-tower #:mvn{:version "0.0.5"},

flake.nix

@@ -0,0 +1,27 @@
+{
+  description = "Flake to manage clojure workspace";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/master";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = nixpkgs.legacyPackages.${system};
+
+      in {
+        devShell = pkgs.mkShell {
+          buildInputs = with pkgs; [
+            clojure
+            jdk
+            leiningen
+          ];
+          shellHook = ''
+            export JAVA_HOME=${pkgs.jdk}
+            PATH="${pkgs.jdk}/bin:$PATH"
+          '';
+        };
+      });
+}