cmd/sgblog/gopher.go

   1 /*
   2 SGBlog -- Git-based CGI blogging engine
   3 Copyright (C) 2020 Sergey Matveev <stargrave@stargrave.org>
   4
   5 This program is free software: you can redistribute it and/or modify
   6 it under the terms of the GNU Affero General Public License as
   7 published by the Free Software Foundation, version 3 of the License.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 GNU General Public License for more details.
  13
  14 You should have received a copy of the GNU Affero General Public License
  15 along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16 */
  17
  18 // Git-based CGI blogging engine
  19 package main
  20
  21 import (
  22         "bufio"
  23         "bytes"
  24         "encoding/json"
  25         "errors"
  26         "fmt"
  27         "io"
  28         "io/ioutil"
  29         "log"
  30         "os"
  31         "strconv"
  32         "strings"
  33
  34         "github.com/hjson/hjson-go"
  35         "go.stargrave.org/sgblog"
  36         "gopkg.in/src-d/go-git.v4"
  37         "gopkg.in/src-d/go-git.v4/plumbing"
  38 )
  39
  40 const CRLF = "\r\n"
  41
  42 var DashLine = strings.Repeat("-", 72)
  43
  44 func serveGopher() {
  45         cfgPath := os.Args[2]
  46         cfgRaw, err := ioutil.ReadFile(cfgPath)
  47         if err != nil {
  48                 log.Fatalln(err)
  49         }
  50         var cfgGeneral map[string]interface{}
  51         if err = hjson.Unmarshal(cfgRaw, &cfgGeneral); err != nil {
  52                 log.Fatalln(err)
  53         }
  54         cfgRaw, err = json.Marshal(cfgGeneral)
  55         if err != nil {
  56                 log.Fatalln(err)
  57         }
  58         var cfg *Cfg
  59         if err = json.Unmarshal(cfgRaw, &cfg); err != nil {
  60                 log.Fatalln(err)
  61         }
  62         if cfg.GopherDomain == "" {
  63                 log.Fatalln("GopherDomain is not configured")
  64         }
  65
  66         headHash, err := initRepo(cfg)
  67         if err != nil {
  68                 log.Fatalln(err)
  69         }
  70
  71         scanner := bufio.NewScanner(io.LimitReader(os.Stdin, 1<<8))
  72         if !scanner.Scan() {
  73                 log.Fatalln(errors.New("no CRLF found"))
  74         }
  75         selector := scanner.Text()
  76         if selector == "" {
  77                 selector = "offset/0"
  78         }
  79         if strings.HasPrefix(selector, "offset/") {
  80                 offset, err := strconv.Atoi(selector[len("offset/"):])
  81                 if err != nil {
  82                         log.Fatalln(err)
  83                 }
  84                 repoLog, err := repo.Log(&git.LogOptions{From: *headHash})
  85                 if err != nil {
  86                         log.Fatalln(err)
  87                 }
  88                 commitN := 0
  89                 for i := 0; i < offset; i++ {
  90                         if _, err = repoLog.Next(); err != nil {
  91                                 break
  92                         }
  93                         commitN++
  94                 }
  95
  96                 logEnded := false
  97                 var menu bytes.Buffer
  98                 for i := 0; i < PageEntries; i++ {
  99                         commit, err := repoLog.Next()
 100                         if err != nil {
 101                                 logEnded = true
 102                                 break
 103                         }
 104                         commitN++
 105                         lines := msgSplit(commit.Message)
 106
 107                         var commentsValue string
 108                         if l := len(parseComments(getNote(commentsTree, commit.Hash))); l > 0 {
 109                                 commentsValue = fmt.Sprintf(" (%dC)", l)
 110                         }
 111                         menu.WriteString(fmt.Sprintf(
 112                                 "0[%s] %s (%dL)%s\t/%s\t%s\t%d%s",
 113                                 commit.Author.When.Format(sgblog.WhenFmt),
 114                                 lines[0],
 115                                 len(lines)-2,
 116                                 commentsValue,
 117                                 commit.Hash.String(),
 118                                 cfg.GopherDomain, 70, CRLF,
 119                         ))
 120                 }
 121
 122                 var links bytes.Buffer
 123                 if offset > 0 {
 124                         offsetPrev := offset - PageEntries
 125                         if offsetPrev < 0 {
 126                                 offsetPrev = 0
 127                         }
 128                         links.WriteString(fmt.Sprintf(
 129                                 "1Prev\toffset/%d\t%s\t%d%s",
 130                                 offsetPrev,
 131                                 cfg.GopherDomain, 70, CRLF,
 132                         ))
 133                 }
 134                 if !logEnded {
 135                         links.WriteString(fmt.Sprintf(
 136                                 "1Next\toffset/%d\t%s\t%d%s",
 137                                 offset+PageEntries,
 138                                 cfg.GopherDomain, 70, CRLF,
 139                         ))
 140                 }
 141
 142                 fmt.Printf(
 143                         "i%s (%d-%d)\t\tnull.host\t1%s",
 144                         cfg.Title,
 145                         offset,
 146                         offset+PageEntries,
 147                         CRLF,
 148                 )
 149                 if cfg.AboutURL != "" {
 150                         fmt.Printf("iAbout: %s\t\tnull.host\t1%s", cfg.AboutURL, CRLF)
 151                 }
 152                 fmt.Print(links.String())
 153                 fmt.Print(menu.String())
 154                 fmt.Print("." + CRLF)
 155         } else if sha1DigestRe.MatchString(selector) {
 156                 commit, err := repo.CommitObject(plumbing.NewHash(selector[1:]))
 157                 if err != nil {
 158                         log.Fatalln(err)
 159                 }
 160                 fmt.Printf(
 161                         "What: %s\nWhen: %s\n%s\n%s",
 162                         commit.Hash.String(),
 163                         commit.Author.When.Format(sgblog.WhenFmt),
 164                         DashLine,
 165                         commit.Message,
 166                 )
 167                 notesRaw := getNote(notesTree, commit.Hash)
 168                 if len(notesRaw) > 0 {
 169                         fmt.Printf("%s\nNote:\n%s\n", DashLine, string(notesRaw))
 170                 }
 171                 for i, comment := range parseComments(getNote(commentsTree, commit.Hash)) {
 172                         fmt.Printf("%s\ncomment %d:\n%s\n", DashLine, i, comment)
 173                 }
 174         } else {
 175                 log.Fatalln(errors.New("unknown selector"))
 176         }
 177 }