a nice installer

Makefile

@@ -0,0 +1,4 @@
+all:install
+
+install:
+	./install.sh

install.sh

@@ -0,0 +1,31 @@
+#!/bin/bash
+
+fail () {
+  echo "$@" >&2
+  exit 1
+}
+SCRIPT=$0
+SCRIPTDIR=$(dirname -- "$SCRIPT")
+for i in $HOME/.{g,}vim{rc,rc.local}; do
+  if [ -f "$i" ] || [ -d "$i" ]; then
+    echo "backing up $i to $i.bak"
+    mv $i{,.bak} || fail "failed backup"
+  fi
+done
+if ! [ "$SCRIPTDIR" == "$HOME/.vim" ]; then
+  if [ -d "$HOME/.vim" ]; then
+    mv -- "$HOME/.vim"{,.bak}
+  fi
+  echo "copying to $HOME/.vim"
+  cp -r -- $SCRIPTDIR $HOME/.vim || fail "failed copy"
+  cd $HOME/.vim
+  $HOME/.vim/install.sh || fail "failed install"
+  exit $?
+fi
+
+cd $HOME
+ln -s .vim/vimrc .vimrc               || fail ".vimrc"
+ln -s .vim/vimrc.local .vimrc.local   || fail ".vimrc.local"
+ln -s .vim/gvimrc .gvimrc             || fail ".gvimrc"
+ln -s .vim/gvimrc.local .gvimrc.local || fail ".gvimrc.local"
+