Introduce XML comment style

Contributes to #22

Note this fixes unnecessary escaping when applying the license
template as `headache` relied until now on `html/template` instead
of `text/template`. This prevented the XML comment style to be
properly applied.

docs/schema.json

@@ -20,7 +20,8 @@
         "dashdash",
         "semicolon",
         "rem",
-        "slashstarstar"
+        "slashstarstar",
+        "xml"
       ]
     },
     "includes": {

internal/pkg/core/comment_style.go

@@ -17,9 +17,10 @@
 package core
 
 import (
-	styles "github.com/fbiville/headache/internal/pkg/core/comment_styles"
 	"log"
 	"strings"
+
+	styles "github.com/fbiville/headache/internal/pkg/core/comment_styles"
 )
 
 type CommentStyle interface {
@@ -53,6 +54,7 @@ func SupportedStyles() []CommentStyle {
 		styles.SemiColon{},
 		styles.Rem{},
 		styles.SlashStarStar{},
+		styles.Xml{},
 	}
 }
 

internal/pkg/core/comment_style_test.go

@@ -18,13 +18,14 @@ package core_test
 
 import (
 	"encoding/json"
+	"io/ioutil"
+	"sort"
+	"strings"
+
 	. "github.com/fbiville/headache/internal/pkg/core"
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/ginkgo/extensions/table"
 	. "github.com/onsi/gomega"
-	"io/ioutil"
-	"sort"
-	"strings"
 )
 
 var _ = Describe("Comment styles", func() {
@@ -45,6 +46,7 @@ var _ = Describe("Comment styles", func() {
 		Entry("matches SemiColon comment style", "SemiColon", "", "", "; "),
 		Entry("matches REM comment style", "REM", "", "", "REM "),
 		Entry("matches SlashStarStar comment style", "SlashStarStar", "/**", " */", " * "),
+		Entry("matches XML comment style", "XML", "<!--", "-->", ""),
 	)
 
 	It("include only the following", func() {
@@ -58,6 +60,7 @@ var _ = Describe("Comment styles", func() {
 			"SlashSlash",
 			"SlashStar",
 			"SlashStarStar",
+			"XML",
 		}))
 		Expect(lowerAll(catalog)).To(Equal(sortedStylesInSchema("../../../docs/schema.json")),
 			"Expected all declared styles to be included in JSON schema")

internal/pkg/core/comment_styles/xml.go

@@ -0,0 +1,32 @@
+/*
+ * Copyright 2019 Florent Biville (@fbiville)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package styles
+
+type Xml struct{}
+
+func (Xml) GetName() string {
+	return "XML"
+}
+func (Xml) GetOpeningString() string {
+	return "<!--"
+}
+func (Xml) GetString() string {
+	return ""
+}
+func (Xml) GetClosingString() string {
+	return "-->"
+}

internal/pkg/core/headache.go

@@ -18,14 +18,15 @@ package core
 
 import (
 	"fmt"
-	"github.com/fbiville/headache/internal/pkg/fs"
-	"github.com/fbiville/headache/internal/pkg/vcs"
-	tpl "html/template"
 	"log"
 	"os"
 	"regexp"
 	"strconv"
 	"strings"
+	tpl "text/template"
+
+	"github.com/fbiville/headache/internal/pkg/fs"
+	"github.com/fbiville/headache/internal/pkg/vcs"
 )
 
 type Headache struct {

internal/pkg/core/header_detector.go

@@ -18,10 +18,10 @@ package core
 
 import (
 	"fmt"
-	tpl "html/template"
 	"regexp"
 	"sort"
 	"strings"
+	tpl "text/template"
 )
 
 func ComputeHeaderDetectionRegex(lines []string, data map[string]string) (string, error) {

internal/pkg/core/template_parser.go

@@ -17,9 +17,9 @@
 package core
 
 import (
-	tpl "html/template"
 	"regexp"
 	"strings"
+	tpl "text/template"
 )
 
 type ParsedTemplate struct { // visible for testing