#!/bin/ksh
if [ $# != 1 ]; then
cat <<EOF
usage: $0 enable|disable
EOF
  exit 1
fi

modify_httpd_conf(){
sed -e '
s|^#LoadModule include_module libexec/apache2/mod_include.so$|LoadModule include_module libexec/apache2/mod_include.so|;
s|^    #AddType text/html .shtml$|    AddType text/html .shtml|;
s|^    #AddOutputFilter INCLUDES .shtml$|    AddOutputFilter INCLUDES .shtml|;
s|^    DirectoryIndex index.html$|    DirectoryIndex index.cgi index.shtml index.html|;
s|^	#LoadModule cgi_module libexec/apache2/mod_cgi.so|	LoadModule cgi_module libexec/apache2/mod_cgi.so|;
s|^#LoadModule cgi_module libexec/apache2/mod_cgi.so$|LoadModule cgi_module libexec/apache2/mod_cgi.so|;
s|^    #AddHandler cgi-script .cgi$|    AddHandler cgi-script .cgi|;
s|^#LoadModule userdir_module libexec/apache2/mod_userdir.so$|LoadModule userdir_module libexec/apache2/mod_userdir.so|;
s|^#Include /private/etc/apache2/extra/httpd-userdir.conf|Include /private/etc/apache2/extra/httpd-userdir.conf|
' "$1"
}
modify_httpd_userdir_conf(){
sed -e '
s|^#Include /private/etc/apache2/users/\*.conf$|Include /private/etc/apache2/users/*.conf|
' "$1"
}

if [ "$1" = enable ]; then
  [ -f "/private/etc/apache2/users/$LOGNAME.conf" ] ||
  cat <<EOF | sudo dd of="/private/etc/apache2/users/$LOGNAME.conf"
<Directory "/Users/$LOGNAME/Sites/">
    Options Indexes FollowSymLinks ExecCGI Includes MultiViews
    AllowOverride FileInfo AuthConfig Limit Indexes Options
    Require all granted
</Directory>
EOF
  diff -u /etc/apache2/httpd.conf <(modify_httpd_conf /etc/apache2/httpd.conf) > /dev/null || {
    suffix="-$(stat -f '%Sm' -t '%Y%m%d%H%M%S' /etc/apache2/httpd.conf)"
    sudo mv /etc/apache2/httpd.conf /etc/apache2/httpd.conf"$suffix"
    modify_httpd_conf /etc/apache2/httpd.conf"$suffix" | sudo dd of=/etc/apache2/httpd.conf
  }
  diff -u /etc/apache2/extra/httpd-userdir.conf <(modify_httpd_userdir_conf /etc/apache2/extra/httpd-userdir.conf) > /dev/null || {
    suffix="-$(stat -f '%Sm' -t '%Y%m%d%H%M%S' /etc/apache2/extra/httpd-userdir.conf)"
    sudo mv /etc/apache2/extra/httpd-userdir.conf /etc/apache2/extra/httpd-userdir.conf"$suffix"
    modify_httpd_userdir_conf /etc/apache2/extra/httpd-userdir.conf"$suffix" | sudo dd of=/etc/apache2/extra/httpd-userdir.conf
  }
  sudo launchctl load -w /System/Library/LaunchDaemons/org.apache.httpd.plist
elif [ $1 = disable ]; then
  sudo launchctl unload -w /System/Library/LaunchDaemons/org.apache.httpd.plist
fi