Quoting not needed inside double brackets

Fixes #8

shellharden.rs

@@ -619,6 +619,14 @@ fn keyword_or_command(
 		return flush(i);
 	}
 	let word = &horizon[i..i+len];
+	if word == b"[[" {
+		return WhatNow{
+			tri: Transition::Push(Box::new(
+				SitVec{terminator: vec!{b']', b']'}, color: 0x00007fff}
+			)),
+			pre: i, len: len, alt: None
+		};
+	}
 	match KEYWORDS_SORTED.binary_search(&word) {
 		Ok(_) => WhatNow{
 			tri: Transition::Push(Box::new(SitExtent{

test/expected/control_structures.bash

@@ -0,0 +1,18 @@
+if [[ -v $julenissen ]]; then
+	[[ $julenissen ]] || [[ $kake ]] || exit 1
+	env [[ He is a "$n"åså ]]
+	a a a a | a a a a ; a a a a & a a a a
+fi
+
+# Comment above command
+true
+
+if true; then true true; fi
+
+echo It is not possible \
+# FIXME \
+echo to comment between args
+
+if test -e julenissen; then echo ja; elif test -e kake; then echo ok; else echo nei; fi
+for i in "$a"; do echo "$i"; done
+case "$PATH" in *"$HOME"*) echo homeopath;; esac

test/expected/unexpected_eof_doublebracket.bash

@@ -0,0 +1,5 @@
+[[
+
+test/original/unexpected_eof_doublebracket.bash: Unexpected end of file
+The file's end was reached without closing all sytactic scopes.
+Either, the parser got lost, or the file is truncated or malformed.

test/original/control_structures.bash

@@ -0,0 +1,18 @@
+if [[ -v $julenissen ]]; then
+	[[ $julenissen ]] || [[ $kake ]] || exit 1
+	env [[ He is a $nåså ]]
+	a a a a | a a a a ; a a a a & a a a a
+fi
+
+# Comment above command
+true
+
+if true; then true true; fi
+
+echo It is not possible \
+# FIXME \
+echo to comment between args
+
+if test -e julenissen; then echo ja; elif test -e kake; then echo ok; else echo nei; fi
+for i in $a; do echo $i; done
+case $PATH in *"$HOME"*) echo homeopath;; esac

test/original/unexpected_eof_doublebracket.bash

@@ -0,0 +1 @@
+[[