From f87582250fd324cd04886cd84a7ee58d03133b13 Mon Sep 17 00:00:00 2001
From: Adrian Kummerlaender
Date: Sun, 24 Feb 2019 21:02:29 +0100
Subject: Add nix-shell environment type to tasker

Allows for convenient management of non-project-specific shell environments.
---
 custom.nix          |  5 ++++-
 gui/pkgs/tasker.nix | 13 +++++++++----
 host/obelix.nix     |  2 +-
 tasks/default.nix   | 23 +++++++++++++++++++++--
 4 files changed, 35 insertions(+), 8 deletions(-)

diff --git a/custom.nix b/custom.nix
index 4928f2a..06b6676 100644
--- a/custom.nix
+++ b/custom.nix
@@ -21,12 +21,15 @@ in {
             default = "~/";
           };
           type = mkOption {
-            type = types.enum [ "launcher" "terminal" ];
+            type = types.enum [ "launcher" "terminal" "environment" ];
             default = "launcher";
           };
           command = mkOption {
             type = types.str;
           };
+          environment = mkOption {
+            type = types.package;
+          };
         };
       });
     };
diff --git a/gui/pkgs/tasker.nix b/gui/pkgs/tasker.nix
index bc87ee9..fa1a319 100644
--- a/gui/pkgs/tasker.nix
+++ b/gui/pkgs/tasker.nix
@@ -6,16 +6,21 @@ pkgs.lib.mapAttrsToList (name: conf: let
     executable  = true;
     destination = "/bin/tasker_cmd_" + name;
     text = pkgs.lib.attrByPath [ conf.type ] "" {
-      terminal = ''
-        #!/bin/sh
-        exec ${pkgs.kitty}/bin/kitty -d ${conf.directory} ${conf.command}
-      '';
       launcher = ''
         #!/bin/sh
         pushd ${conf.directory}
           exec ${conf.command}
         popd
       '';
+      terminal = ''
+        #!/bin/sh
+        exec ${pkgs.kitty}/bin/kitty -d ${conf.directory} ${conf.command}
+      '';
+      environment = ''
+        #!/bin/sh
+        exec ${pkgs.kitty}/bin/kitty -d ${conf.directory} nix-shell \
+             ${builtins.unsafeDiscardStringContext conf.environment.drvPath} --command fish
+      '';
     };
   };
   shortcut = pkgs.writeTextFile {
diff --git a/host/obelix.nix b/host/obelix.nix
index 45cf20d..6fd02bc 100644
--- a/host/obelix.nix
+++ b/host/obelix.nix
@@ -10,8 +10,8 @@
   custom.tasks = {
     "compustream_shell" = {
       description = "compustream dev shell";
+      type = "terminal";
       directory = "~/projects/dev/compustream";
-      terminal = true;
       command = "nix-shell --command fish";
     };
   };
diff --git a/tasks/default.nix b/tasks/default.nix
index e851c24..6966fd2 100644
--- a/tasks/default.nix
+++ b/tasks/default.nix
@@ -1,6 +1,15 @@
-{ pkgs ? import <nixpkgs> { }, ... }:
+{ pkgs, ... }:
 
-{
+let
+  mkShellDerivation = n: ps: pkgs.stdenvNoCC.mkDerivation rec {
+    name = n;
+    buildInputs = ps;
+    shellHook = ''
+      export NIX_SHELL_NAME="${name}"
+    '';
+  };
+
+in {
   custom.tasks = {
     bsc_edit = {
       description = "Grid refinement BSc thesis editor";
@@ -29,5 +38,15 @@
       directory = "~/projects/contrib/openlb";
       command = "nix-shell --command fish";
     };
+    cpp_shell = {
+      description = "Generic C++ shell environment";
+      type = "environment";
+      directory = "~/";
+      environment = mkShellDerivation "cpp-env" (with pkgs; [
+        cmake
+        gcc8
+        gdb cgdb
+      ]);
+    };
   };
 }
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