tab completion :)

README.md

@@ -50,6 +50,14 @@ running java with the command `java -jar pdl.jar <args>`.
 We also provide a script `pdl` in the `bin` directory that
 runs the executable jar with the provided arguments.
 
+#### Tab completion
+
+We provide a bash autocomplete script in the `bin` directory.
+To enable tab completion on `./bin/pdl` and `pdl`, simply source
+the script `pdl-completion.bash`. You can do this by adding it to
+the file `~/.bash_completion`, or whatever your preferred sourcing
+method may be.
+
 ### Generating Hardware
 
 PDL produces BSV code which can then be run via the BSV simulator,

bin/pdl-completion.bash

@@ -0,0 +1,26 @@
+ #/usr/bin/bash
+
+_pdl()
+{
+    local cur=${COMP_WORDS[COMP_CWORD]}
+
+    if [[ $cur == -* ]] ; then
+	local opts="--help --out --printStages --debug --portwarn --autocast --addrLockModule --reglockModule"
+	local fword=${COMP_WORDS[1]}
+	if [ $fword == "interpret" ]; then
+	    opts="$opts --maxIterations --memoryInput"
+	elif [ $fword == "gen" ]; then
+	     opts="$opts --memInit"
+	fi
+	COMPREPLY=( $( compgen -W "$opts" -- "$cur"))
+    else
+	if [ "${#COMP_WORDS[@]}" != "2" ]; then
+	    COMPREPLY=( $( compgen -o plusdirs -f -X "!*.pdl" -- $cur ))
+	else
+	    COMPREPLY=( $( compgen -W "gen typecheck parse interpret" -- "$cur"))
+	fi
+    fi
+}
+
+
+complete -o filenames -F _pdl ./bin/pdl pdl