all: bring back support for Markdown

I use two remote repositories: GitHub and SourceHut.
GitHub support rendering README using asciidoc while SourceHut not.
This cause the repository that use README.adoc rendered as text in
SourceHut which make the repository page less readable.

Also, the pkg.go.dev now render README but only support Markdown.

Since we cannot control the SourceHut and go.dev, the only option is
to support converting Markdown in ciigo so I can write README using
Markdown and the rest of documentation using Asciidoc.

1 files changed, 15 insertions, 8 deletions

diff --git a/ciigo.go b/ciigo.go
index 6806fa0..1f785db 100644
--- a/ciigo.go
+++ b/ciigo.go
@@ -22,6 +22,7 @@ import (
 
 const (
 	extAsciidoc          = `.adoc`
+	extMarkdown          = `.md`
 	internalTemplatePath = `_internal/.template`
 )
 
@@ -30,6 +31,7 @@ var (
 
 	defExcludes = []string{
 		`.*\.adoc$`,
+		`.*\.md$`,
 		`^\..*`,
 	}
 )
@@ -43,7 +45,7 @@ func Convert(opts *ConvertOptions) (err error) {
 		logp = `Convert`
 
 		converter   *Converter
-		fileMarkups map[string]*fileMarkup
+		fileMarkups map[string]*FileMarkup
 	)
 
 	if opts == nil {
@@ -84,7 +86,7 @@ func GoEmbed(opts *EmbedOptions) (err error) {
 		logp = `GoEmbed`
 
 		converter    *Converter
-		fileMarkups  map[string]*fileMarkup
+		fileMarkups  map[string]*FileMarkup
 		mfs          *memfs.MemFS
 		mfsOpts      *memfs.Options
 		convertForce bool
@@ -245,27 +247,32 @@ func isHtmlTemplateNewer(opts *EmbedOptions) bool {
 	return fiHtmlTmpl.ModTime().After(fiGoEmbed.ModTime())
 }
 
+// isExtensionMarkup return true if the file extension ext match with one of
+// supported markup format.
 func isExtensionMarkup(ext string) bool {
-	return ext == extAsciidoc
+	if ext == extAsciidoc {
+		return true
+	}
+	return ext == extMarkdown
 }
 
 // listFileMarkups find any markup files inside the content directory,
 // recursively.
 func listFileMarkups(dir string, excRE []*regexp.Regexp) (
-	fileMarkups map[string]*fileMarkup, err error,
+	fileMarkups map[string]*FileMarkup, err error,
 ) {
 	var (
 		logp = `listFileMarkups`
 
 		d        *os.File
 		fi       os.FileInfo
-		fmarkup  *fileMarkup
+		fmarkup  *FileMarkup
 		name     string
 		filePath string
 		k        string
 		ext      string
 		fis      []os.FileInfo
-		fmarkups map[string]*fileMarkup
+		fmarkups map[string]*FileMarkup
 	)
 
 	d, err = os.Open(dir)
@@ -278,7 +285,7 @@ func listFileMarkups(dir string, excRE []*regexp.Regexp) (
 		return nil, fmt.Errorf(`%s: %w`, logp, err)
 	}
 
-	fileMarkups = make(map[string]*fileMarkup)
+	fileMarkups = make(map[string]*FileMarkup)
 
 	for _, fi = range fis {
 		name = fi.Name()
@@ -317,7 +324,7 @@ func listFileMarkups(dir string, excRE []*regexp.Regexp) (
 		if fi.Size() == 0 {
 			continue
 		}
-		fmarkup, err = newFileMarkup(filePath, fi)
+		fmarkup, err = NewFileMarkup(filePath, fi)
 		if err != nil {
 			return nil, fmt.Errorf(`%s: %s: %w`, logp, filePath, err)
 		}