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markdown.go
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markdown.go
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package setup
import (
"io/ioutil"
"net/http"
"os"
"path"
"path/filepath"
"strings"
"github.com/mholt/caddy/middleware"
"github.com/mholt/caddy/middleware/markdown"
"github.com/russross/blackfriday"
)
// Markdown configures a new Markdown middleware instance.
func Markdown(c *Controller) (middleware.Middleware, error) {
mdconfigs, err := markdownParse(c)
if err != nil {
return nil, err
}
md := markdown.Markdown{
Root: c.Root,
FileSys: http.Dir(c.Root),
Configs: mdconfigs,
IndexFiles: []string{"index.md"},
}
// For any configs that enabled static site gen, sweep the whole path at startup
c.Startup = append(c.Startup, func() error {
for _, cfg := range mdconfigs {
if cfg.StaticDir == "" {
continue
}
// If generated site already exists, clear it out
_, err := os.Stat(cfg.StaticDir)
if err == nil {
err := os.RemoveAll(cfg.StaticDir)
if err != nil {
return err
}
}
fp := filepath.Join(md.Root, cfg.PathScope)
filepath.Walk(fp, func(path string, info os.FileInfo, err error) error {
for _, ext := range cfg.Extensions {
if !info.IsDir() && strings.HasSuffix(info.Name(), ext) {
// Load the file
body, err := ioutil.ReadFile(path)
if err != nil {
return err
}
// Get the relative path as if it were a HTTP request,
// then prepend with "/" (like a real HTTP request)
reqPath, err := filepath.Rel(md.Root, path)
if err != nil {
return err
}
reqPath = "/" + reqPath
// Generate the static file
_, err = md.Process(cfg, reqPath, body)
if err != nil {
return err
}
break // don't try other file extensions
}
}
return nil
})
}
return nil
})
return func(next middleware.Handler) middleware.Handler {
md.Next = next
return md
}, nil
}
func markdownParse(c *Controller) ([]markdown.Config, error) {
var mdconfigs []markdown.Config
for c.Next() {
md := markdown.Config{
Renderer: blackfriday.HtmlRenderer(0, "", ""),
Templates: make(map[string]string),
StaticFiles: make(map[string]string),
}
// Get the path scope
if !c.NextArg() || c.Val() == "{" {
return mdconfigs, c.ArgErr()
}
md.PathScope = c.Val()
// Load any other configuration parameters
for c.NextBlock() {
switch c.Val() {
case "ext":
exts := c.RemainingArgs()
if len(exts) == 0 {
return mdconfigs, c.ArgErr()
}
md.Extensions = append(md.Extensions, exts...)
case "css":
if !c.NextArg() {
return mdconfigs, c.ArgErr()
}
md.Styles = append(md.Styles, c.Val())
case "js":
if !c.NextArg() {
return mdconfigs, c.ArgErr()
}
md.Scripts = append(md.Scripts, c.Val())
case "template":
tArgs := c.RemainingArgs()
switch len(tArgs) {
case 0:
return mdconfigs, c.ArgErr()
case 1:
if _, ok := md.Templates[markdown.DefaultTemplate]; ok {
return mdconfigs, c.Err("only one default template is allowed, use alias.")
}
fpath := filepath.Clean(c.Root + string(filepath.Separator) + tArgs[0])
md.Templates[markdown.DefaultTemplate] = fpath
case 2:
fpath := filepath.Clean(c.Root + string(filepath.Separator) + tArgs[1])
md.Templates[tArgs[0]] = fpath
default:
return mdconfigs, c.ArgErr()
}
case "sitegen":
if c.NextArg() {
md.StaticDir = path.Join(c.Root, c.Val())
} else {
md.StaticDir = path.Join(c.Root, markdown.DefaultStaticDir)
}
if c.NextArg() {
// only 1 argument allowed
return mdconfigs, c.ArgErr()
}
default:
return mdconfigs, c.Err("Expected valid markdown configuration property")
}
}
// If no extensions were specified, assume .md
if len(md.Extensions) == 0 {
md.Extensions = []string{".md"}
}
mdconfigs = append(mdconfigs, md)
}
return mdconfigs, nil
}