feat: sample the Slackware facts into a cache file

Conky's Lua has no lfs, so it cannot stat a file, and counting 2800 package
files per draw would be a directory walk every two seconds.

Writes epochs rather than formatted dates. The shell function this replaces
rebuilds a date from ls -l output with the year hardcoded, which breaks every
January and on any file older than six months.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

1 files changed, 47 insertions, 0 deletions

diff --git a/bin/slackware-sample.sh b/bin/slackware-sample.sh
new file mode 100755
index 0000000..3eb4818
--- /dev/null
+++ b/bin/slackware-sample.sh
@@ -0,0 +1,47 @@
+#!/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)
+
+# The TRAILING SLASH is load-bearing. /var/log/packages is a symlink to
+# /var/lib/pkgtools/packages, and `ls -1 /var/log/packages` lists the link
+# itself: one entry. With the slash it lists the target's contents, which on
+# this machine is some 2800 packages. Do not remove it as cosmetic.
+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"