Merge pull request #4121 from apjanke/chucknorris-check-for-fortune

chucknorris: check for fortune/strfile dependency

plugins/chucknorris/chucknorris.plugin.zsh

-if [ ! -f $ZSH/plugins/chucknorris/fortunes/chucknorris.dat ]; then
-    strfile $ZSH/plugins/chucknorris/fortunes/chucknorris $ZSH/plugins/chucknorris/fortunes/chucknorris.dat
+# chucknorris: Chuck Norris fortunes
+
+# Automatically generate or update Chuck's compiled fortune data file
+# $0 must be used outside a local function. This variable name is unlikly to collide.
+CHUCKNORRIS_PLUGIN_DIR=${0:h}
+
+() {
+local DIR=$CHUCKNORRIS_PLUGIN_DIR/fortunes
+if [[ ! -f $DIR/chucknorris.dat ]] || [[ $DIR/chucknorris.dat -ot $DIR/chucknorris ]]; then
+  # For some reason, Cygwin puts strfile in /usr/sbin, which is not on the path by default
+  local strfile=strfile
+  if ! which strfile &>/dev/null && [[ -f /usr/sbin/strfile ]]; then
+    strfile=/usr/sbin/strfile
+  fi
+  if which $strfile &> /dev/null; then
+    $strfile $DIR/chucknorris $DIR/chucknorris.dat >/dev/null
+  else
+    echo "[oh-my-zsh] chucknorris depends on strfile, which is not installed" >&2
+    echo "[oh-my-zsh] strfile is often provided as part of the 'fortune' package" >&2
+  fi
 fi
 
-alias chuck="fortune -a $ZSH/plugins/chucknorris/fortunes"
+# Aliases
+alias chuck="fortune -a $DIR"
 alias chuck_cow="chuck | cowthink"
+}
+
+unset CHUCKNORRIS_PLUGIN_DIR