move flake-parts into pkgs or toplevel

pkgs/tea-create-pr/default.nix

@@ -0,0 +1,26 @@
+{
+  perSystem =
+    { pkgs
+    , ...
+    }:
+    let
+      name = builtins.baseNameOf ./.;
+      script = pkgs.writeShellApplication {
+        inherit name;
+        runtimeInputs = [
+          pkgs.bash
+          pkgs.coreutils
+          pkgs.git
+          pkgs.tea
+          pkgs.openssh
+        ];
+        text = ''
+          export EDITOR=${pkgs.vim}/bin/vim
+          bash ${./script.sh} "$@"
+        '';
+      };
+    in
+    {
+      packages.${name} = script;
+    };
+}

pkgs/tea-create-pr/script.sh

@@ -0,0 +1,31 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+remoteName="${1:-origin}"
+targetBranch="${2:-main}"
+shift && shift
+TMPDIR="$(mktemp -d)"
+currentBranch="$(git rev-parse --abbrev-ref HEAD)"
+user="$(tea login list -o simple | cut -d" " -f4)"
+tempRemoteBranch="$user-$currentBranch"
+
+git log --reverse --pretty="format:%s%n%n%b%n%n" "$remoteName/$targetBranch..HEAD" > "$TMPDIR"/commit-msg
+
+$EDITOR "$TMPDIR"/commit-msg
+
+COMMIT_MSG=$(cat "$TMPDIR"/commit-msg)
+
+firstLine=$(echo "$COMMIT_MSG" | head -n1)
+rest=$(echo "$COMMIT_MSG" | tail -n+2)
+
+if [[ "$firstLine" == "$rest" ]]; then
+  rest=""
+fi
+git push --force -u "$remoteName" HEAD:refs/heads/"$tempRemoteBranch"
+
+tea pr create \
+  --title "$firstLine" \
+  --description "$rest" \
+  --head "$tempRemoteBranch" \
+  --base "$targetBranch" \
+  "$@"