bootstrap lib, add mkDevShell

1 files changed, 30 insertions, 0 deletions

diff --git a/lib/mk-dev-shell.nix b/lib/mk-dev-shell.nix
new file mode 100644
index 0000000..e0bb441
--- /dev/null
+++ b/lib/mk-dev-shell.nix
@@ -0,0 +1,30 @@
+{ pkgs
+, tools ? []
+, envVars ? {}
+}:
+
+let
+  # TODO: escape values properly
+  exportEnvVar = k: v: ''export ${k}="${v}"; echo ${k}=\"${v}\"'';
+  exportedEnvVars = pkgs.lib.mapAttrsToList exportEnvVar envVars;
+
+in pkgs.mkShell {
+  buildInputs = tools;
+
+  # TODO: handle case with no env variable set
+  # TODO: handle case with no package in tools
+  # TODO: allow custom shell
+  shellHook = ''
+    echo -e "\nDEVSHELL ENVIRONMENT VARIABLES:"
+    ${pkgs.lib.concatStringsSep "\n" exportedEnvVars}
+
+    echo -e "\nDEVSHELL COMMANDS:"
+    ls "${pkgs.symlinkJoin { name = "env"; paths = tools; }}/bin"
+
+    # Use the default user shell instead of Bash
+    $(${pkgs.finger_bsd}/bin/finger $USER \
+      | ${pkgs.gnugrep}/bin/grep -oP 'Shell: \K.*')
+
+    exit $?
+  '';
+}