macOS: SSH detection fails due to BSD awk not supporting \s regex

[Traumt3nzer]

Description

On macOS, the plugin fails to detect SSH sessions when splitting panes. New panes open on the local machine instead of SSHing to the remote server.

Root Cause

The get_child_cmds() function in scripts/tmux-ssh-split.sh uses \s in the awk regex pattern (line 273):

ps -o ppid=,pid=,command= | \
  awk '/^\s*'"${ppid}"'\s+/ { $1=""; print $0 }'

macOS uses BSD awk, which does not support \s (Perl-style regex). The pattern silently fails to match, so no SSH process is ever found.

Reproduction

# On macOS, this returns nothing:
echo " 6485  6512 ssh" | awk '/^\s*6485\s+/ { print }'

# But this works:
echo " 6485  6512 ssh" | awk '/^[[:space:]]*6485[[:space:]]+/ { print }'

Fix

Replace \s with the POSIX character class [[:space:]]:

ps -o ppid=,pid=,command= | \
  awk '/^[[:space:]]*'"${ppid}"'[[:space:]]+/ { $1=""; print $0 }'

This works on both Linux (GNU awk) and macOS (BSD awk).

Environment

• macOS (Darwin)
• BSD awk (default on macOS)
• tmux-ssh-split installed via TPM

[pschmitt]

Could you open a PR?