#!/bin/bash
# Sample Slackware facts into a cache file, for widgets/slackware.lua.
#
# Conky's Lua has no lfs, so it cannot stat a file for an mtime, and counting
# 2800 package files every two seconds would be a directory walk per draw.
# Both belong here.

set -u

CACHE_DIR="${XDG_CACHE_HOME:-$HOME/.cache}/udt"
CACHE="$CACHE_DIR/slackware.txt"

umask 077
mkdir -p "$CACHE_DIR"

TMP="$CACHE.tmp.$$"
trap 'rm -f "$TMP"' EXIT

VERSION=$(cat /etc/slackware-version 2>/dev/null || echo unknown)

# /var/log/packages is a symlink to /var/lib/pkgtools/packages. GNU ls follows
# it either way, so the trailing slash is belt and braces rather than the load
# bearing part; what would break this is adding -d, which lists the link itself
# and reports one package.
#
# The real trap is `ls` being aliased: the user's shell aliases it to `ls -lh`,
# and a long-format listing counts a "total" header line as a package. This
# script is not interactive so aliases do not apply, but do not move this
# counting into anything that is.
PACKAGES=$(ls -1 /var/log/packages/ 2>/dev/null | wc -l)

# Epochs, never formatted dates. The shell function this replaces rebuilds a
# date string from `ls -l` output with the year hardcoded, which breaks every
# January and on any file older than six months, when ls prints a year instead
# of a time and the field offsets shift.
CHANGELOG=$(stat -c %Y /var/lib/slackpkg/ChangeLog.txt 2>/dev/null || echo 0)

# Filesystem birth time: the install date. Not every filesystem records it,
# and those that do not report 0, which the widget shows as '--'.
BIRTH=$(stat -c %W / 2>/dev/null || echo 0)

KERNEL=$(uname -r)

{
    echo "version $VERSION"
    echo "packages $PACKAGES"
    echo "changelog $CHANGELOG"
    echo "birth $BIRTH"
    echo "kernel $KERNEL"
} > "$TMP"

mv -f "$TMP" "$CACHE"