pkgs/build-support: Add writePytonScript helper function

pkgs/build-support/default.nix

@@ -0,0 +1,5 @@
+final: prev:
+
+{
+  writePythonScript = final.callPackage ./writePythonScript.nix {};
+}

pkgs/build-support/writePythonScript.nix

@@ -0,0 +1,37 @@
+{
+  python3,
+  writeTextFile,
+  lib,
+}:
+
+{
+  name,
+  text,
+  runtimePackages ? ps: [],
+  pythonPackage ? python3,
+  meta ? {},
+  passthru ? {},
+  derivationArgs ? {},
+}:
+
+let
+
+  pythonWithPackages = pythonPackage.withPackages runtimePackages;
+
+in writeTextFile {
+  inherit
+    name
+    meta
+    passthru
+    derivationArgs
+    ;
+  executable = true;
+  destination = "/bin/${name}";
+  allowSubstitutes = true;
+  preferLocalBuild = false;
+  text = ''
+    #!${lib.getExe pythonWithPackages}
+
+    ${text}
+  '';
+}

pkgs/git-show-link/default.nix

@@ -1,13 +1,6 @@
 { pkgs, ... }:
 
-pkgs.writeTextFile {
+pkgs.clerie-build-support.writePythonScript {
   name = "git-show-link";
-  executable = true;
-  destination = "/bin/git-show-link";
-  allowSubstitutes = true;
-  preferLocalBuild = false;
-  text = ''
-    #!${pkgs.python3.withPackages (ps: with ps; [])}/bin/python3
-    ${builtins.readFile ./git-show-link.py}
-  '';
+  text = builtins.readFile ./git-show-link.py;
 }

pkgs/pkgs.nix

@@ -1,4 +1,6 @@
 {
+  clerie-build-support = final: prev: import ./build-support final prev;
+
   clerie-backup = final: prev: final.callPackage ./clerie-backup {};
   clerie-cleanup-branches = final: prev: final.callPackage ./clerie-update-nixfiles/clerie-cleanup-branches.nix {};
   clerie-keys = final: prev: final.callPackage ./clerie-keys {};