[sagemath] 01/01: Add a script to help detect which build dependencies changed recently

[Ximin Luo]

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infinity0 pushed a commit to branch master
in repository sagemath.

commit 07edc67a94c7de4236505be9130f28de5ac47e28
Author: Ximin Luo <infinity0 at debian.org>
Date:   Sat Oct 15 15:50:00 2016 +0200

    Add a script to help detect which build dependencies changed recently
---
 debian/show-deps.sh | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)

diff --git a/debian/show-deps.sh b/debian/show-deps.sh
new file mode 100755
index 0000000..a4b2c38
--- /dev/null
+++ b/debian/show-deps.sh
@@ -0,0 +1,47 @@
+#!/bin/sh
+# Show sagemath's build dependencies. (You should run `mk-build-deps` first.)
+# Usage: ./$0 [by-size|by-date] [extra aptitude filter]
+# e.g. give ~i to only list packages installed on your system.
+pkg=sagemath-build-deps
+d=~R
+r=~Rrecommends:
+
+case "$1" in
+by-size|by-date) subcmd="$1"; shift;;
+*) subcmd="";;
+esac
+# 3 levels of dependencies should be enough; we also include recommends just in case
+pattern="($d$pkg|$d$d$pkg|$r$d$pkg|$d$d$d$pkg|$d$r$d$pkg|$r$d$d$pkg|$r$r$d$pkg) $1"
+
+last_updated() {
+	local pkg="$1"
+	local pkgname="${pkg%:*}"
+	if [ -f "/usr/share/doc/$pkgname/changelog.Debian.gz" ]; then
+		local changelog="/usr/share/doc/$pkgname/changelog.Debian.gz"
+	else
+		local changelog="/usr/share/doc/$pkgname/changelog.gz"
+	fi
+	echo "$(zcat "$changelog" | dpkg-parsechangelog -l- -STimestamp) $pkgname"
+}
+
+case "$subcmd" in
+by-size)
+LC_ALL=C aptitude search "$pattern" --disable-columns -F '%I %p' \
+  | sed -e 's/ kB / KB /g' \
+  | LC_ALL=C sort -k2,2 -k1n,1n \
+  | sed -e 's/ KB / kB /g'
+;;
+by-date)
+echo >&2 "by-date selected; restricting to installed packages"
+LC_ALL=C aptitude search "$pattern ~i" --disable-columns -F '%p' \
+  | {
+	while read pkg; do
+		printf >&2 "reading changelogs: $pkg                            \r"
+		last_updated "$pkg"
+	done
+  } | sort -n | { while read t pkg; do printf "$(date -d@$t) $pkg\n"; done; }
+;;
+*)
+LC_ALL=C aptitude search "$pattern"
+;;
+esac

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