all: fix list check box text get cut one character

Given the following asciidoc check box markup,

  * [ ] abc

It will rendereded as "❏ bc" instead of "❏ abc".

This commit fix this issue.

2 files changed, 64 insertions, 2 deletions

diff --git a/element.go b/element.go
index 933692f..bdaf4c3 100644
--- a/element.go
+++ b/element.go
@@ -496,14 +496,22 @@ func (el *element) parseListUnorderedItem(line []byte) {
 		if bytes.Equal(checklist, []byte("[ ]")) {
 			sym = symbolUnchecked
 		} else if bytes.Equal(checklist, []byte("[x]")) ||
+			bytes.Equal(checklist, []byte("[X]")) ||
 			bytes.Equal(checklist, []byte("[*]")) {
 			sym = symbolChecked
 		}
-		if len(sym) > 0 {
+		if len(sym) != 0 {
 			el.WriteString(sym)
 			el.WriteByte(' ')
-			line = line[x+2:]
 			el.addRole(classNameChecklist)
+			x += 3
+			for ; x < len(line); x++ {
+				if line[x] == ' ' || line[x] == '\t' {
+					continue
+				}
+				break
+			}
+
 		}
 	}
 	el.Write(line[x:])
diff --git a/element_test.go b/element_test.go
index a53b6ff..8f0f1a4 100644
--- a/element_test.go
+++ b/element_test.go
@@ -33,6 +33,60 @@ func TestAdocNode_parseListDescriptionItem(t *testing.T) {
 	}
 }
 
+func TestElement_parseListUnorderedItem(t *testing.T) {
+	cases := []struct {
+		desc     string
+		line     []byte
+		expRaw   []byte
+		expRoles []string
+		expLevel int
+	}{{
+		desc:     "With text",
+		line:     []byte("* \t a"),
+		expRaw:   []byte("a\n"),
+		expLevel: 1,
+	}, {
+		desc:     "With unchecked box, no text",
+		line:     []byte("* [ ]"),
+		expRaw:   []byte("[ ]\n"),
+		expLevel: 1,
+	}, {
+		desc:     "With unchecked box",
+		line:     []byte("* [ ] \t a"),
+		expRaw:   []byte("&#10063; a\n"),
+		expRoles: []string{classNameChecklist},
+		expLevel: 1,
+	}, {
+		desc:     "With checked box, using 'x'",
+		line:     []byte("* [x] \t a"),
+		expRaw:   []byte("&#10003; a\n"),
+		expRoles: []string{classNameChecklist},
+		expLevel: 1,
+	}, {
+		desc:     "With checked box, using 'X'",
+		line:     []byte("* [X] \t a"),
+		expRaw:   []byte("&#10003; a\n"),
+		expRoles: []string{classNameChecklist},
+		expLevel: 1,
+	}, {
+		desc:     "With checked box, using '*'",
+		line:     []byte("* [*] \t a"),
+		expRaw:   []byte("&#10003; a\n"),
+		expRoles: []string{classNameChecklist},
+		expLevel: 1,
+	}}
+
+	for _, c := range cases {
+		el := &element{}
+		el.raw = el.raw[:0]
+		el.parseListUnorderedItem(c.line)
+
+		test.Assert(t, c.desc+" - level", c.expLevel, el.level)
+		test.Assert(t, c.desc+" - roles", c.expRoles, el.roles)
+		test.Assert(t, c.desc+" - raw", c.expRaw, el.raw)
+	}
+}
+
 func TestAdocNode_postConsumeTable(t *testing.T) {
 	cases := []struct {
 		desc string