Generated shell.zsh uses 'exit 0' instead of 'return 0', causing shell to terminate

[ianks]

Bug Description

When antigen generates the ~/.antigen/shell.zsh file, it includes a check for an existing Ruby helper process. If found, it uses exit 0 which terminates the entire shell session instead of just returning from the script.

The Problem

The generated shell.zsh contains:

[[ -f "$PID_FILE" ]] && PID=$(<"$PID_FILE") && [[ "$PID" =~ ^[0-9]+$ ]] && \
    kill -0 "$PID" 2>/dev/null && ps -p "$PID" -o comm= | grep -q ruby && exit 0

This causes the shell to completely exit when:

1. Starting a new tmux window/pane
2. Opening a new terminal tab
3. Any situation where a new shell is spawned while the Ruby helper is already running

The Fix

Replace exit 0 with return 0:

[[ -f "$PID_FILE" ]] && PID=$(<"$PID_FILE") && [[ "$PID" =~ ^[0-9]+$ ]] && \
    kill -0 "$PID" 2>/dev/null && ps -p "$PID" -o comm= | grep -q ruby && return 0

Impact

This bug makes it impossible to create new tmux windows or terminal sessions when antigen's Ruby helper process is running, severely impacting usability.

Environment

• OS: macOS
• Shell: zsh 5.9
• Antigen: latest
• Tmux: 3.5

Workaround

Users can manually edit ~/.antigen/shell.zsh and change exit 0 to return 0, but this file may be regenerated by antigen.