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         "time"
  34
  35         "github.com/hjson/hjson-go"
  36         "go.stargrave.org/sgblog"
  37         "gopkg.in/src-d/go-git.v4"
  38         "gopkg.in/src-d/go-git.v4/plumbing"
  39 )
  40
  41 const CRLF = "\r\n"
  42
  43 var DashLine = strings.Repeat("-", 72)
  44
  45 func serveGopher() {
  46         cfgPath := os.Args[2]
  47         cfgRaw, err := ioutil.ReadFile(cfgPath)
  48         if err != nil {
  49                 log.Fatalln(err)
  50         }
  51         var cfgGeneral map[string]interface{}
  52         if err = hjson.Unmarshal(cfgRaw, &cfgGeneral); err != nil {
  53                 log.Fatalln(err)
  54         }
  55         cfgRaw, err = json.Marshal(cfgGeneral)
  56         if err != nil {
  57                 log.Fatalln(err)
  58         }
  59         var cfg *Cfg
  60         if err = json.Unmarshal(cfgRaw, &cfg); err != nil {
  61                 log.Fatalln(err)
  62         }
  63         if cfg.GopherDomain == "" {
  64                 log.Fatalln("GopherDomain is not configured")
  65         }
  66
  67         headHash, err := initRepo(cfg)
  68         if err != nil {
  69                 log.Fatalln(err)
  70         }
  71
  72         scanner := bufio.NewScanner(io.LimitReader(os.Stdin, 1<<8))
  73         if !scanner.Scan() {
  74                 log.Fatalln(errors.New("no CRLF found"))
  75         }
  76         selector := scanner.Text()
  77         if selector == "" {
  78                 selector = "offset/0"
  79         }
  80         if strings.HasPrefix(selector, "offset/") {
  81                 offset, err := strconv.Atoi(selector[len("offset/"):])
  82                 if err != nil {
  83                         log.Fatalln(err)
  84                 }
  85                 repoLog, err := repo.Log(&git.LogOptions{From: *headHash})
  86                 if err != nil {
  87                         log.Fatalln(err)
  88                 }
  89                 commitN := 0
  90                 for i := 0; i < offset; i++ {
  91                         if _, err = repoLog.Next(); err != nil {
  92                                 break
  93                         }
  94                         commitN++
  95                 }
  96
  97                 logEnded := false
  98                 var menu bytes.Buffer
  99                 var yearPrev int
 100                 var monthPrev time.Month
 101                 var dayPrev int
 102                 for i := 0; i < PageEntries; i++ {
 103                         commit, err := repoLog.Next()
 104                         if err != nil {
 105                                 logEnded = true
 106                                 break
 107                         }
 108                         yearCur, monthCur, dayCur := commit.Author.When.Date()
 109                         if dayCur != dayPrev || monthCur != monthPrev || yearCur != yearPrev {
 110                                 menu.WriteString(fmt.Sprintf(
 111                                         "i%04d-%02d-%02d\t\tnull.host\t1%s",
 112                                         yearCur, monthCur, dayCur, CRLF,
 113                                 ))
 114                                 yearPrev, monthPrev, dayPrev = yearCur, monthCur, dayCur
 115                         }
 116                         commitN++
 117                         lines := msgSplit(commit.Message)
 118                         var commentsValue string
 119                         if l := len(parseComments(getNote(commentsTree, commit.Hash))); l > 0 {
 120                                 commentsValue = fmt.Sprintf(" (%dC)", l)
 121                         }
 122                         menu.WriteString(fmt.Sprintf(
 123                                 "0[%02d:%02d] %s (%dL)%s\t/%s\t%s\t%d%s",
 124                                 commit.Author.When.Hour(),
 125                                 commit.Author.When.Minute(),
 126                                 lines[0],
 127                                 len(lines)-2,
 128                                 commentsValue,
 129                                 commit.Hash.String(),
 130                                 cfg.GopherDomain, 70, CRLF,
 131                         ))
 132                 }
 133
 134                 var links bytes.Buffer
 135                 if offset > 0 {
 136                         offsetPrev := offset - PageEntries
 137                         if offsetPrev < 0 {
 138                                 offsetPrev = 0
 139                         }
 140                         links.WriteString(fmt.Sprintf(
 141                                 "1Prev\toffset/%d\t%s\t%d%s",
 142                                 offsetPrev,
 143                                 cfg.GopherDomain, 70, CRLF,
 144                         ))
 145                 }
 146                 if !logEnded {
 147                         links.WriteString(fmt.Sprintf(
 148                                 "1Next\toffset/%d\t%s\t%d%s",
 149                                 offset+PageEntries,
 150                                 cfg.GopherDomain, 70, CRLF,
 151                         ))
 152                 }
 153
 154                 fmt.Printf(
 155                         "i%s (%d-%d)\t\tnull.host\t1%s",
 156                         cfg.Title,
 157                         offset,
 158                         offset+PageEntries,
 159                         CRLF,
 160                 )
 161                 if cfg.AboutURL != "" {
 162                         fmt.Printf("iAbout: %s\t\tnull.host\t1%s", cfg.AboutURL, CRLF)
 163                 }
 164                 fmt.Print(links.String())
 165                 fmt.Print(menu.String())
 166                 fmt.Print("." + CRLF)
 167         } else if sha1DigestRe.MatchString(selector) {
 168                 commit, err := repo.CommitObject(plumbing.NewHash(selector[1:]))
 169                 if err != nil {
 170                         log.Fatalln(err)
 171                 }
 172                 fmt.Printf(
 173                         "What: %s\nWhen: %s\n%s\n%s",
 174                         commit.Hash.String(),
 175                         commit.Author.When.Format(sgblog.WhenFmt),
 176                         DashLine,
 177                         commit.Message,
 178                 )
 179                 notesRaw := getNote(notesTree, commit.Hash)
 180                 if len(notesRaw) > 0 {
 181                         fmt.Printf("%s\nNote:\n%s\n", DashLine, string(notesRaw))
 182                 }
 183                 for i, comment := range parseComments(getNote(commentsTree, commit.Hash)) {
 184                         fmt.Printf("%s\ncomment %d:\n%s\n", DashLine, i, comment)
 185                 }
 186         } else {
 187                 log.Fatalln(errors.New("unknown selector"))
 188         }
 189 }