Add module directive, modulemeta builtin

Fix #425.

tests/run

@@ -71,6 +71,12 @@ if [ $n -ne 5 ]; then
     exit 1
 fi
 
+v=`scripts/version`
+case "$v" in
+*-*) v=next;;
+*) true;;
+esac
+
 ## Test library/module system
 
 cat > "$d/.jq" <<EOF
@@ -81,22 +87,31 @@ def g: "bar";
 def fg: f+g;
 EOF
 
-cat > "$d/a.jq" <<EOF
+mkdir -p "$d/$v/b" "$d/any/c" "$d/any/syntaxerror"
+
+cat > "$d/$v/a.jq" <<EOF
+module a {version:1.7};
 def a: "a";
 EOF
 
-cat > "$d/b.jq" <<EOF
+cat > "$d/$v/b/b.jq" <<EOF
 def a: "b";
 def b: "c";
 EOF
 
-cat > "$d/c.jq" <<EOF
-import a as foo;
-def a: 0;
-def c: foo::a + "c";
+cat > "$d/any/c/d.jq" <<EOF
+def meh: "meh";
 EOF
 
-cat > "$d/syntaxerror.jq" <<EOF
+cat > "$d/any/c/c.jq" <<"EOF"
+module c {whatever:null};
+import a as foo;
+import d as d {search:"$ORIGIN/"};
+def a: 0;
+def c: foo::a + "c" + d::meh;
+EOF
+
+cat > "$d/any/syntaxerror/syntaxerror.jq" <<EOF
 wat;
 EOF
 
@@ -110,16 +125,21 @@ if [ `HOME=$d $VALGRIND $Q ./jq --debug-dump-disasm -n fg | grep '^[a-z]' | wc -
     exit 1
 fi
 
-if ! $VALGRIND $Q ./jq -ner -L $d 'import a as foo; import b as bar; import a as foobar; def fooa: foo::a; [fooa, bar::a, bar::b, foo::a, foobar::a] | . == ["a","b","c","a","a"]' > /dev/null; then
+if ! $VALGRIND $Q ./jq -ner -L $d 'import a as foo; import b as bar; import a; def fooa: foo::a; [fooa, bar::a, bar::b, foo::a, a] | . == ["a","b","c","a","a"]' > /dev/null; then
     echo "Module system appears to be broken" 1>&2
     exit 1
 fi
 
-if ! $VALGRIND $Q ./jq -ner -L $d 'import c as foo; [foo::a, foo::c] | . == [0,"ac"]' > /dev/null; then
+if ! $VALGRIND $Q ./jq -ner -L $d 'import c as foo; [foo::a, foo::c] | . == [0,"acmeh"]' > /dev/null; then
     echo "Module system appears to be broken" 1>&2
     exit 1
 fi
 
+if [ "`$VALGRIND $Q ./jq -cner -L $d '\"c\" | modulemeta'`" != '{"whatever":null,"name":"c","deps":[{"as":"foo","name":"a"},{"search":"$ORIGIN/","as":"d","name":"d"}]}' ]; then
+    echo "modulemeta builtin appears to be broken" 1>&2
+    exit 1
+fi
+    
 if $VALGRIND ./jq -ner -L $d 'import syntaxerror; .' > $d/out 2>&1; then
     echo "Module system appears to be broken" 1>&2
     exit 1