From 9ab4d557b3294c61bdee3978be50f59c63b71c37 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Nicol=C3=A1s=20Reynolds?= <fauno@kiwwwi.com.ar>
Date: Sat, 22 Sep 2012 04:26:38 -0300
Subject: Manage dependency installation and removal by tapping into makepkg

---
 clean-pacman | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100755 clean-pacman

diff --git a/clean-pacman b/clean-pacman
new file mode 100755
index 0000000..0c22ef0
--- /dev/null
+++ b/clean-pacman
@@ -0,0 +1,52 @@
+#!/bin/bash
+# Copyright 2012 Nicolás Reynolds <fauno@parabola.nu> Licensed under GPLv3
+#
+# Smart cleanup of the chroot, restores chroot to its original state but also
+# leaves the dependencies needed by the current package.
+#
+# Useful when you're building a lot of packages one after another and they
+# share some dependencies.
+#
+# Logic: tap into `makepkg -s`
+#
+# Use it as the PACMAN var for makepkg: `PACMAN=$0 makepkg`
+
+set -e
+set -x
+
+cleanup_log=/tmp/libretools-cleanup.log
+cmd="$1"; shift
+# make -Rn respect PACMAN_OPTS
+flags=($(echo "$@" | grep -o "\-\-no\(confirm\|progressbar\)" || true))
+args="$@"
+
+case $cmd in
+# Collect the packages that are going to be installed, but use a clean database to
+# get the full needed list
+# See update-cleansystem
+    -T)
+# Use sudo because $0 is run as normal user
+        sudo pacman -b "${BD:-/var/lib/libretools/clean}" -Sy
+        sudo pacman -b "${BD:-/var/lib/libretools/clean}" \
+                    -Sp \
+                    --print-format "%n" \
+                    ${args[@]} >>${cleanup_log}
+    ;;
+# Diff against previously installed packages and remove the unneeded ones
+    -S)
+        cleanup=($(comm -23 \
+                        <(pacman -Qq | sort) \
+                        <(cat /etc/libretools.d/cleansystem ${cleanup_log} | sort -u)
+                ))
+
+        if [ ${#cleanup[@]} -gt 0 ]; then
+# At this point $0 is run as root
+            pacman -Rn ${flags[@]} ${cleanup[@]}
+        fi
+    ;;
+# Remove the cleanup log at the end
+    -R) rm ${cleanup_log} ;;
+esac
+
+# Make makepkg dreams come true
+pacman $cmd ${args[@]}
-- 
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