add fetch-3rd-party.sh and remove installExternal.sh

The new script not only clones the git repo once but can also pulls
updates from all git repositories every time it is executed and allows
to symlink binaries into $HOME/bin

fetch-3rd-party.sh

@@ -0,0 +1,37 @@
+#!/bin/bash -e
+
+::() {
+	echo ":: $*" >&2
+	"$@"
+}
+
+# usage: fetch <name> <git repo> [<bin symlinks> ...]
+fetch() {
+	dir="$HOME/misc/$1"
+	if [ -d "$dir" ]; then
+		# try to pull changes from repository without merging
+		:: git --git-dir="$dir/.git" --work-tree="$dir" pull --ff-only
+	else
+		# clone repository if it does not exist yet
+		:: git clone "$2" "$dir"
+	fi
+	shift
+	shift
+	# symlink all following filenames into $HOME/bin if existent
+	while x="$1"; shift; do
+		file=$(:: find "$dir" -name "$x" | head -n 1)
+		if [ -z "$file" ]; then
+			echo "Missing file: $x"
+		else
+			target="${file##*/}"
+			target="${target%.py}"
+			:: ln -sf "$file" "$HOME/bin/$target"
+		fi
+	done
+}
+
+
+fetch barpyrus https://github.com/t-wissmann/barpyrus.git
+fetch i3lock-fancy https://github.com/meskarune/i3lock-fancy.git lock
+fetch siji https://github.com/stark/siji
+:: sh -c 'cd $HOME/misc/siji && ./install.sh -d "$HOME/.fonts"'

installExternal.sh

@@ -1,5 +0,0 @@
-#! /bin/bash
-mkdir ~/misc
-cd ~/misc
-
-git clone https://github.com/t-wissmann/barpyrus.git