All: add keywords.

Also, fix nth and count to match cloure.

Author: kanaka

Makefile

@@ -78,7 +78,7 @@ java_RUNSTEP =    mvn -quiet exec:java -Dexec.mainClass="mal.$($(1))" -Dexec.arg
 js_RUNSTEP =      node ../$(2) $(3)
 make_RUNSTEP =    make -f ../$(2) $(3)
 mal_RUNSTEP =     $(call $(MAL_IMPL)_RUNSTEP,$(1),$(call $(MAL_IMPL)_STEP_TO_PROG,stepA),../$(2),")  #"
-perl_RUNSTEP =    perl ../$(2) $(3)
+perl_RUNSTEP =    perl ../$(2) --raw $(3)
 php_RUNSTEP =     php ../$(2) $(3)
 ps_RUNSTEP =      $(4)gs -q -I./ -dNODISPLAY -- ../$(2) $(3)$(4)
 python_RUNSTEP =  $(PYTHON) ../$(2) $(3)

bash/core.sh

@@ -41,6 +41,11 @@ false? () { _false? "${1}" && r="${__true}" || r="${__false}"; }
 symbol? () { _symbol? "${1}" && r="${__true}" || r="${__false}"; }
 
 
+# Keyword functions
+
+keyword? () { _keyword? "${1}" && r="${__true}" || r="${__false}"; }
+
+
 # Number functions
 
 number? () { _number? "${1}" && r="${__true}" || r="${__false}"; }
@@ -230,6 +235,10 @@ concat () {
 
 nth () {
     _nth "${1}" "${ANON["${2}"]}"
+    if [ -z "${r}" ]; then
+        _error "nth: index out of bounds"
+        return
+    fi
 }
 
 empty? () { _empty? "${1}" && r="${__true}" || r="${__false}"; }
@@ -316,7 +325,10 @@ declare -A core_ns=(
     [nil?]=nil?
     [true?]=true?
     [false?]=false?
+    [symbol]=_symbol
     [symbol?]=symbol?
+    [keyword]=_keyword
+    [keyword?]=keyword?
 
     [pr-str]=pr_str
     [str]=str