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blogo.go
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blogo.go
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package main
import (
"bytes"
"encoding/json"
"errors"
"github.com/hoisie/mustache"
"github.com/hoisie/web"
"code.google.com/p/go.net/html"
"io"
"io/ioutil"
"log"
"os"
"path/filepath"
"regexp"
"strings"
"time"
)
type Tag struct {
Name string
}
type Entry struct {
Id string
Filename string
Title string
Body string
Created time.Time
Category string
Author string
Tags []Tag
}
func toTextChild(w io.Writer, n *html.Node) error {
switch n.Type {
case html.ErrorNode:
return errors.New("unexpected ErrorNode")
case html.DocumentNode:
return errors.New("unexpected DocumentNode")
case html.ElementNode:
case html.TextNode:
w.Write([]byte(n.Data))
case html.CommentNode:
return errors.New("COMMENT")
default:
return errors.New("unknown node type")
}
for c := n.FirstChild; c != nil; c = c.NextSibling {
if err := toTextChild(w, c); err != nil {
return err
}
}
return nil
}
func toText(n *html.Node) (string, error) {
if n == nil || n.FirstChild == nil {
return "", nil
}
b := bytes.NewBuffer(nil)
for c := n.FirstChild; c != nil; c = c.NextSibling {
if err := toTextChild(b, c); err != nil {
return "", err
}
}
return b.String(), nil
}
func GetEntry(filename string) (entry *Entry, err error) {
fi, err := os.Stat(filename)
if err != nil {
return nil, err
}
f, err := os.Open(filename)
if err != nil {
return nil, err
}
b, err := ioutil.ReadAll(f)
if err != nil {
return nil, err
}
in_body := false
re, err := regexp.Compile("^meta-([a-zA-Z]+):[:space:]*(.*)$")
if err != nil {
return nil, err
}
for n, line := range strings.Split(string(b), "\n") {
line = strings.TrimSpace(line)
if n == 0 {
entry = new(Entry)
entry.Title = line
entry.Filename = filepath.Clean(filename)
entry.Tags = []Tag{}
entry.Created = fi.ModTime()
continue
}
if n > 0 && len(line) == 0 {
in_body = true
continue
}
if in_body == false && re.MatchString(line) {
submatch := re.FindStringSubmatch(line)
if submatch[1] == "tags" {
tags := strings.Split(submatch[2], ",")
entry.Tags = make([]Tag, len(tags))
for i, t := range tags {
entry.Tags[i].Name = strings.TrimSpace(t)
}
}
if submatch[1] == "author" {
entry.Author = submatch[2]
}
} else {
entry.Body += strings.Trim(line, "\r") + "\n"
}
}
if entry == nil {
err = errors.New("invalid entry file")
}
return
}
func GetEntries(root string, useSummary bool) (entries []*Entry, err error) {
filepath.Walk(root, func(path string, info os.FileInfo, err error) error {
if strings.ToLower(filepath.Ext(path)) != ".txt" {
return nil
}
entry, _ := GetEntry(path)
if entry == nil {
return nil
}
entries = append(entries, entry)
if useSummary {
doc, err := html.Parse(strings.NewReader(entry.Body))
if err == nil {
if text, err := toText(doc); err == nil {
if len(text) > 500 {
text = text[0:500] + "..."
}
entry.Body = text
}
}
}
entry.Id = entry.Filename[len(root):len(entry.Filename)-3] + "html"
return nil
})
return
}
type Config map[string]interface{}
func (c *Config) Set(key string, val interface{}) {
(*c)[key] = val
}
func (c *Config) Is(key string) bool {
val, ok := (*c)[key].(bool)
if !ok {
return false
}
return val
}
func (c *Config) Get(key string) string {
val, ok := (*c)[key].(string)
if !ok {
return ""
}
return val
}
func LoadConfig() (config Config) {
root, _ := filepath.Split(filepath.Clean(os.Args[0]))
b, err := ioutil.ReadFile(filepath.Join(root, "config.json"))
if err != nil {
log.Fatal(err)
}
json.Unmarshal(b, &config)
return
}
func Render(ctx *web.Context, tmpl string, config *Config, name string, data interface{}) {
tmpl = filepath.Join(config.Get("datadir"), tmpl)
ctx.WriteString(mustache.RenderFile(tmpl,
map[string]interface{}{
"config": config,
name: data}))
}
func main() {
config := LoadConfig()
web.Get("/(.*)", func(ctx *web.Context, path string) {
config = LoadConfig()
datadir := config.Get("datadir")
if path == "" || path[len(path)-1] == '/' {
dir := filepath.Join(datadir, path)
stat, err := os.Stat(dir)
if err != nil || !stat.IsDir() {
ctx.NotFound("File Not Found")
return
}
entries, err := GetEntries(dir, config.Is("useSummary"))
if err == nil {
Render(ctx, "entries.mustache", &config, "entries", entries)
return
}
} else if len(path) > 5 && path[len(path)-5:] == ".html" {
file := filepath.Join(datadir, path[:len(path)-5]+".txt")
_, err := os.Stat(file)
if err != nil {
ctx.NotFound("File Not Found" + err.Error())
return
}
entry, err := GetEntry(file)
if err == nil {
entry.Id = entry.Filename[len(datadir):len(entry.Filename)-3] + "html"
Render(ctx, "entry.mustache", &config, "entry", entry)
return
}
} else if path == "index.rss" {
entries, err := GetEntries(datadir, config.Is("useSummary"))
if err == nil {
ctx.SetHeader("Content-Type", "application/rss+xml; charset=utf-8", true)
Render(ctx, "entries.rss", &config, "entries", entries)
return
}
}
ctx.Abort(500, "Server Error")
})
//web.Config.RecoverPanic = false
web.Config.StaticDir = config.Get("staticdir")
web.Run(config.Get("host"))
}