statusline-command.sh v3.0: stat -f %m regression on Linux/WSL (was #495)

[stratofax]

Problem

Issue #495 fixed the stat -f %m macOS-only syntax in the v2.5 statusline, but PAI v3.0 has regressed:

1. 10 hardcoded stat -f %m calls (up from 7 in v2.5)
2. No get_mtime() wrapper function — it's completely absent from the v3.0 release
3. No export -f — even if the function is added, background subshells ({ ... } &) can't see it without export -f get_mtime

On Linux, stat -f means "display filesystem status" (completely different from macOS's "format" flag), so it silently produces unuseable output instead of the desired file modification epoch data.

Symptoms

Linux users see a broken statusline:

• No LOC or weather data
• No Branch, Age, Mod, or New counts
• Empty LEARNING panel
• Blank SK/WF/Hook counts

Fix

1. Add the function after # PARSE INPUT near the top of statusline-command.sh:

# CROSS-PLATFORM HELPERS
get_mtime() {
    if [[ "$OSTYPE" == darwin* ]]; then
        stat -f %m "$1" 2>/dev/null || echo 0
    else
        stat -c %Y "$1" 2>/dev/null || echo 0
    fi
}
export -f get_mtime

2. Replace all 10 occurrences of stat -f %m "$VAR" 2>/dev/null || echo 0 with get_mtime "$VAR".

Find them with: grep -n 'stat -f %m' statusline-command.sh

3. Ensure fd is available (Ubuntu packages it as fd-find):

sudo apt install -y fd-find
sudo ln -s /usr/bin/fdfind /usr/local/bin/fd

Environment

• Ubuntu Server 24.04.4 LTS (bare metal)
• PAI v3.0 (fresh install from release)
• Claude Code v2.1.42
• Bun 1.3.9

Notes

• The fix is backward-compatible — macOS behavior is unchanged
• export -f get_mtime is critical because the statusline runs parallel background subshells that need the function
• This is the same root cause as statusline-command.sh uses macOS-only stat syntax, breaks on Linux/WSL #495, which was closed for v2.5 but the fix didn't carry forward into v3.0

[kaimagnus]

Thanks for catching this! The v3.0 release already includes a cross-platform get_mtime() wrapper function in statusline-command.sh (line 54-56) that tries stat -c %Y (Linux) first, then falls back to stat -f %m (macOS):

get_mtime() {
    stat -c %Y "$1" 2>/dev/null || stat -f %m "$1" 2>/dev/null || echo 0
}

This resolves the regression. Closing as already fixed in v3.0.

[stratofax]

@kaimagnus I'm glad that was helpful. In the last week, I just cloned my PAI setup from Ubuntu on a Mac, to Ubuntu in a Proxmox container, to Ubuntu on another Mac, a 2011 MacBook Air that was heading to the scrap heap. PAI works quite well on these older devices in a lightweight Linux environment, so I hope more people can spin up instances of PAI on dedicated machines that can't (for example) run the latest macOS. I couldn't think of a better way to use an old computer. I also got the voice server running on Ubuntu, but that's a topic for another post! Thanks for all of your tremendous work to improve PAI. It's transformed my workflow, and how I use AI, and that's all since last Sunday!