Add ability to add a custom version with nix

cli/src/main.rs

@@ -11,6 +11,18 @@ mod import;
 mod init;
 mod load;
 
+fn get_version() -> String {
+    const GIT_HASH: Option<&str> = option_env!("GIT_HASH");
+    const CARGO_VERSION: &str = env!("CARGO_PKG_VERSION");
+
+    let owned = CARGO_VERSION.to_string();
+    if let Some(hash) = GIT_HASH {
+        owned + "-" + hash
+    } else {
+        owned
+    }
+}
+
 fn wrapped_main() -> Result<()> {
     let flags = flags::Skidder::from_env_or_exit();
     match flags.subcommand {
@@ -21,7 +33,7 @@ fn wrapped_main() -> Result<()> {
         flags::SkidderCmd::RegenerateParser(generate_cmd) => generate_cmd.run(),
         flags::SkidderCmd::Version(flags::Version { version }) => {
             if version {
-                println!("skidder-cli {}", env!("CARGO_PKG_VERSION"));
+                println!("skidder-cli {}", get_version());
             } else {
                 println!("{}", flags::Skidder::HELP);
             }

default.nix

@@ -1,18 +1,23 @@
 {
   lib,
   rustPlatform,
-}: let
-    fs = lib.fileset;
 
-    files = fs.difference (fs.gitTracked ./.) (fs.unions [
+  gitRev ? null,
+}:
+let
+  fs = lib.fileset;
+
+  files = fs.difference (fs.gitTracked ./.) (
+    fs.unions [
       ./.github
       ./.envrc
       ./flake.lock
       (fs.fileFilter (file: lib.strings.hasInfix ".git" file.name) ./.)
       (fs.fileFilter (file: file.hasExt "md") ./.)
       (fs.fileFilter (file: file.hasExt "nix") ./.)
-    ]);
-  in
+    ]
+  );
+in
 rustPlatform.buildRustPackage {
   strictDeps = true;
   pname = with builtins; (fromTOML (readFile ./cli/Cargo.toml)).package.name;
@@ -31,5 +36,7 @@ rustPlatform.buildRustPackage {
   cargoBuildFlags = [ "-p skidder-cli" ];
 
   doCheck = false;
+  env.GIT_HASH = gitRev;
+
   meta.mainProgram = "skidder-cli";
 }

flake.nix

@@ -10,7 +10,11 @@
   };
 
   outputs =
-    { self, nixpkgs, rust-overlay }:
+    {
+      self,
+      nixpkgs,
+      rust-overlay,
+    }:
     let
       inherit (nixpkgs) lib;
       forEachSystem = lib.genAttrs lib.systems.flakeExposed;
@@ -24,11 +28,13 @@
             overlays = [ (import rust-overlay) ];
           };
           toolchain = pkgs.rust-bin.stable.latest.default;
-        in {
-          skidder-cli = pkgs.callPackage ./. { };
+        in
+        {
+          skidder-cli = pkgs.callPackage ./. { gitRev = self.rev or self.dirtyRev; };
           default = self.packages.${system}.skidder-cli;
-        });
-    
+        }
+      );
+
       devShell = forEachSystem (
         system:
         let