added script for generating fish shell completions

scripts/buildCompletionsFish.sh

@@ -0,0 +1,34 @@
+#!/bin/bash
+
+if [[ "$1" == "" ]]; then
+  echo "usage $0 outfile"
+  exit 1
+fi
+out="$1"
+
+echo "" > $out
+
+progs="arangobench arangosh arangoimp arangodump arangorestore arangod"
+
+for progname in $progs
+  do
+    # find the executable
+    # check if the executable exists
+    if [[ -f "build/bin/$progname" ]]; then
+      executable="build/bin/$progname"
+  
+      # setup the help command string
+      command="--help-all" 
+
+      # set up the list of completions for the executable
+      echo "# completions for $progname" >> "$out"
+
+      completions="`\"$executable\" $command`"
+      (echo "$completions" | grep "^  " | awk '/^  --/{if (x)print x;x="";}{x=(!x)?$0:x" "$0;}END{print x;}' | sed -e "s/ \+/ /g" | sed -e "s/(default:.*)//g" | sed -e "s/(current:.*)//g" | sed -e "s/<[a-zA-Z0-9]\+>//g" | tr -d "'" | sed -e "s/^ \+--\([a-zA-Z0-9.\-]\+\) \+\(.\+\)$/complete --command $progname -l '\\1' -d '\\2'/g" | sed -e "s/ \+'$/'/g") >> "$out"
+
+      echo "" >> "$out"
+    fi
+  done
+
+echo "completions stored in file $out"
+echo "now copy this file to /etc/bash_completion.d/arangodb"