gct

#!/usr/bin/env bash
# gct <branch> - Switch to worktree for branch (create if needed)

set -eu

NAME=${1:-}

if [ -z "$NAME" ]; then
    echo "Usage: gct <branch>" >&2
    exit 1
fi

# Check for existing worktree
WORKTREE_PATH=$(git worktree list | rg -v "prunable" | rg "\[$NAME\]" | cut -d' ' -f1)

if [ -n "$WORKTREE_PATH" ]; then
    if [ -d "$WORKTREE_PATH" ]; then
        if [ "$PWD" != "$WORKTREE_PATH" ]; then
            cd "$WORKTREE_PATH"
            exec "$SHELL"
        fi
        exit 0
    else
        # Stale entry
        git worktree remove --force "$WORKTREE_PATH"
    fi
fi

# Create new worktree
GIT_COMMON_DIR=$(git rev-parse --git-common-dir)
GIT_COMMON_DIR=$(cd "$(dirname "$GIT_COMMON_DIR")" && pwd)/$(basename "$GIT_COMMON_DIR")
REPO_ROOT=$(dirname "$GIT_COMMON_DIR")
REPO_NAME=$(basename "$REPO_ROOT")
NORMALIZED_NAME=${NAME//\//-}
WT_DIR="$REPO_ROOT/../.worktrees/$REPO_NAME/$NORMALIZED_NAME"

# Check if worktree directory already exists at target path
if [ -d "$WT_DIR" ]; then
    echo "Switching to existing worktree at: $WT_DIR"
    cd "$WT_DIR"
    git switch "$NAME" 2>/dev/null || git switch -c "$NAME"
    exec "$SHELL"
fi

mkdir -p "$(dirname "$WT_DIR")"

if git branch -la | rg -q "^\s*($NAME|remotes/.*/$NAME)$"; then
    git worktree add "$WT_DIR" "$NAME"
else
    git worktree add "$WT_DIR" -b "$NAME"
fi

cd "$WT_DIR"
exec "$SHELL"