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main.go
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package main
import (
"crypto/rand"
"encoding/hex"
"flag"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strings"
"github.com/pkg/browser"
"gitlab.com/golang-commonmark/markdown"
)
const appVersion = "1.4.0"
func main() {
var outfilePtr = flag.String("o", "", "Output filename. (Optional)")
var versionPtr = flag.Bool("version", false, "Prints mdview version.")
var helpPtr = flag.Bool("help", false, "Prints mdview help message.")
var barePtr = flag.Bool("bare", false, "Bare HTML with no style applied.")
var filepathPtr = flag.Bool("filepath", false, "Output filepath instead of html on pipe/redirect")
var xhtmlPtr = flag.Bool("xhtml", false, "Choose XHTML instead of HTML")
var darkPtr = flag.Bool("dark", false, "Darkmode")
flag.BoolVar(versionPtr, "v", false, "Prints mdview version.")
flag.BoolVar(helpPtr, "h", false, "Prints mdview help message.")
flag.BoolVar(barePtr, "b", false, "Bare HTML with no style applied.")
flag.BoolVar(filepathPtr, "f", false, "Output filelocation in pipe/redirect")
flag.BoolVar(xhtmlPtr, "x", false, "Choose XHTML instead of HTML")
flag.BoolVar(darkPtr, "d", false, "Darkmode")
flag.Parse()
inputFilename := flag.Arg(0)
if *versionPtr {
fmt.Println(appVersion)
os.Exit(0)
}
if inputFilename == "" || *helpPtr {
os.Stderr.WriteString("Usage:\nmdview [options] <filename>\nFormats markdown and launches it in a browser.\n")
flag.PrintDefaults()
os.Exit(1)
}
dat, err := ioutil.ReadFile(inputFilename)
check(err)
var htmlorxhtml = markdown.HTML(true)
if *xhtmlPtr {
htmlorxhtml = markdown.XHTMLOutput(true)
}
md := markdown.New(
htmlorxhtml,
markdown.Nofollow(true),
markdown.Tables(true),
markdown.Typographer(true))
markdownTokens := md.Parse(dat)
html := md.RenderTokensToString(markdownTokens)
title := getTitle(markdownTokens)
outfilePath := *outfilePtr
if outfilePath == "" {
outfilePath = tempFileName("mdview", ".html")
}
f, err := os.Create(outfilePath)
check(err)
defer f.Close()
actualStyle := style
if *barePtr {
actualStyle = ""
}
if *darkPtr {
actualStyle = darkstyle
}
_, err = fmt.Fprintf(f, template, actualStyle, title, html)
check(err)
f.Sync()
o, _ := os.Stdout.Stat()
if (o.Mode() & os.ModeCharDevice) == os.ModeCharDevice { //Terminal
//Display info to the terminal
err = browser.OpenFile(outfilePath)
check(err)
} else { //It is not the terminal
// Display info to a pipe
if *filepathPtr {
_, err = fmt.Printf(outfilePath)
} else {
_, err = fmt.Printf(template, actualStyle, title, html)
}
check(err)
}
}
func tempFileName(prefix, suffix string) string {
randBytes := make([]byte, 16)
rand.Read(randBytes)
return filepath.Join(getTempDir(), prefix+hex.EncodeToString(randBytes)+suffix)
}
func getTempDir() string {
if os.Getenv("SNAP_USER_COMMON") != "" {
var tmpdir = os.Getenv("HOME") + "/mdview-temp"
if _, err := os.Stat(tmpdir); os.IsNotExist(err) {
err = os.Mkdir(tmpdir, 0700)
check(err)
}
return tmpdir
}
return os.TempDir()
}
func check(e error) {
if e != nil {
panic(e)
}
}
func getTitle(tokens []markdown.Token) string {
var result string
if len(tokens) > 0 {
for i := 0; i < len(tokens); i++ {
if topLevelHeading, ok := tokens[i].(*markdown.HeadingOpen); ok {
for j := i + 1; j < len(tokens); j++ {
if token, ok := tokens[j].(*markdown.HeadingClose); ok && token.Lvl == topLevelHeading.Lvl {
break
}
result += getText(tokens[j])
}
result = strings.TrimSpace(result)
break
}
}
}
return result
}
func getText(token markdown.Token) string {
switch token := token.(type) {
case *markdown.Text:
return token.Content
case *markdown.Inline:
result := ""
for _, token := range token.Children {
result += getText(token)
}
return result
}
return ""
}
const template = "<!DOCTYPE html><html><head><meta http-equiv=\"content-type\" content=\"text/html; charset=utf-8\"> <style>%s</style><title>%s</title></head><body class=\"markdown-body\">%s</body></html>"
const style = `.markdown-body {box-sizing: border-box;min-width: 200px;max-width:
980px;margin: 0 auto;padding: 45px;} @media (max-width: 767px) {.markdown-body
{padding: 15px;}}.markdown-body hr::after,.markdown-body::after{clear:both}
@font-face{font-family:octicons-link;src:url(data:font/woff;charset=utf-8;
base64,d09GRgABAAAAAAZwABAAAAAACFQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABEU0lHAAAGa
AAAAAgAAAAIAAAAAUdTVUIAAAZcAAAACgAAAAoAAQAAT1MvMgAAAyQAAABJAAAAYFYEU3RjbWFwAA
ADcAAAAEUAAACAAJThvmN2dCAAAATkAAAABAAAAAQAAAAAZnBnbQAAA7gAAACyAAABCUM+8IhnYXN
wAAAGTAAAABAAAAAQABoAI2dseWYAAAFsAAABPAAAAZwcEq9taGVhZAAAAsgAAAA0AAAANgh4a91oa
GVhAAADCAAAABoAAAAkCA8DRGhtdHgAAAL8AAAADAAAAAwGAACfbG9jYQAAAsAAAAAIAAAACABiATBt
YXhwAAACqAAAABgAAAAgAA8ASm5hbWUAAAToAAABQgAAAlXu73sOcG9zdAAABiwAAAAeAAAAME3QpOB
wcmVwAAAEbAAAAHYAAAB/aFGpk3jaTY6xa8JAGMW/O62BDi0tJLYQincXEypYIiGJjSgHniQ6umTsUE
yLm5BV6NDBP8Tpts6F0v+k/0an2i+itHDw3v2+9+DBKTzsJNnWJNTgHEy4BgG3EMI9DCEDOGEXzDADU
5hBKMIgNPZqoD3SilVaXZCER3/I7AtxEJLtzzuZfI+VVkprxTlXShWKb3TBecG11rwoNlmmn1P2WYcJ
czl32etSpKnziC7lQyWe1smVPy/Lt7Kc+0vWY/gAgIIEqAN9we0pwKXreiMasxvabDQMM4riO+qxM2o
gwDGOZTXxwxDiycQIcoYFBLj5K3EIaSctAq2kTYiw+ymhce7vwM9jSqO8JyVd5RH9gyTt2+J/yUmYlI
R0s04n6+7Vm1ozezUeLEaUjhaDSuXHwVRgvLJn1tQ7xiuVv/ocTRF42mNgZGBgYGbwZOBiAAFGJBIMA
AizAFoAAABiAGIAznjaY2BkYGAA4in8zwXi+W2+MjCzMIDApSwvXzC97Z4Ig8N/BxYGZgcgl52BCSQK
AA3jCV8CAABfAAAAAAQAAEB42mNgZGBg4f3vACQZQABIMjKgAmYAKEgBXgAAeNpjYGY6wTiBgZWBg2k
mUxoDA4MPhGZMYzBi1AHygVLYQUCaawqDA4PChxhmh/8ODDEsvAwHgMKMIDnGL0x7gJQCAwMAJd4MFw
AAAHjaY2BgYGaA4DAGRgYQkAHyGMF8NgYrIM3JIAGVYYDT+AEjAwuDFpBmA9KMDEwMCh9i/v8H8sH0/
4dQc1iAmAkALaUKLgAAAHjaTY9LDsIgEIbtgqHUPpDi3gPoBVyRTmTddOmqTXThEXqrob2gQ1FjwpDv
fwCBdmdXC5AVKFu3e5MfNFJ29KTQT48Ob9/lqYwOGZxeUelN2U2R6+cArgtCJpauW7UQBqnFkUsjAY/
kOU1cP+DAgvxwn1chZDwUbd6CFimGXwzwF6tPbFIcjEl+vvmM/byA48e6tWrKArm4ZJlCbdsrxksL1A
wWn/yBSJKpYbq8AXaaTb8AAHja28jAwOC00ZrBeQNDQOWO//sdBBgYGRiYWYAEELEwMTE4uzo5Zzo5b
2BxdnFOcALxNjA6b2ByTswC8jYwg0VlNuoCTWAMqNzMzsoK1rEhNqByEyerg5PMJlYuVueETKcd/89u
BpnpvIEVomeHLoMsAAe1Id4AAAAAAAB42oWQT07CQBTGv0JBhagk7HQzKxca2sJCE1hDt4QF+9JOS0n
baaYDCQfwCJ7Au3AHj+LO13FMmm6cl7785vven0kBjHCBhfpYuNa5Ph1c0e2Xu3jEvWG7UdPDLZ4N92
nOm+EBXuAbHmIMSRMs+4aUEd4Nd3CHD8NdvOLTsA2GL8M9PODbcL+hD7C1xoaHeLJSEao0FEW14ckxC
+TU8TxvsY6X0eLPmRhry2WVioLpkrbp84LLQPGI7c6sOiUzpWIWS5GzlSgUzzLBSikOPFTOXqly7rqx
0Z1Q5BAIoZBSFihQYQOOBEdkCOgXTOHA07HAGjGWiIjaPZNW13/+lm6S9FT7rLHFJ6fQbkATOG1j2OF
MucKJJsxIVfQORl+9Jyda6Sl1dUYhSCm1dyClfoeDve4qMYdLEbfqHf3O/AdDumsjAAB42mNgYoAAZQ
YjBmyAGYQZmdhL8zLdDEydARfoAqIAAAABAAMABwAKABMAB///AA8AAQAAAAAAAAAAAAAAAAABAAAAAA==)
format('woff')}.markdown-body{-ms-text-size-adjust:100%;-webkit-text-size-adjust:100%;
color:#24292e;font-family:-apple-system,BlinkMacSystemFont,\"Segoe UI\",
Helvetica,Arial,sans-serif,\"Apple Color Emoji\",\"Segoe UI Emoji\",\"Segoe UI Symbol\"
;font-size:16px;line-height:1.5;word-wrap:break-word}.markdown-body .pl-c{color:#6a737d}
.markdown-body .pl-c1,.markdown-body .pl-s .pl-v{color:#005cc5}.markdown-body .pl-e,
.markdown-body .pl-en{color:#6f42c1}.markdown-body .pl-s .pl-s1,.markdown-body .pl-smi{color:#24292e}
.markdown-body .pl-ent{color:#22863a}.markdown-body .pl-k{color:#d73a49}.markdown-body .pl-pds,
.markdown-body .pl-s,.markdown-body .pl-s .pl-pse .pl-s1,.markdown-body .pl-sr,.markdown-body
.pl-sr .pl-cce,.markdown-body .pl-sr .pl-sra,.markdown-body .pl-sr .pl-sre{color:#032f62}.markdown-body
.pl-smw,.markdown-body .pl-v{color:#e36209}.markdown-body .pl-bu{color:#b31d28}.markdown-body
.pl-ii{color:#fafbfc;background-color:#b31d28}.markdown-body .pl-c2{color:#fafbfc;background-color:#d73a49}
.markdown-body .pl-c2::before{content:\"^M\"}.markdown-body .pl-sr .pl-cce{font-weight:700;color:#22863a}
.markdown-body .pl-ml{color:#735c0f}.markdown-body .pl-mh,.markdown-body .pl-mh .pl-en,.markdown-body
.pl-ms{font-weight:700;color:#005cc5}.markdown-body .pl-mi{font-style:italic;color:#24292e}.markdown-body
.pl-mb{font-weight:700;color:#24292e}.markdown-body .pl-md{color:#b31d28;background-color:#ffeef0}
.markdown-body .pl-mi1{color:#22863a;background-color:#f0fff4}.markdown-body .pl-mc{color:#e36209;
background-color:#ffebda}.markdown-body .pl-mi2{color:#f6f8fa;background-color:#005cc5}
.markdown-body .pl-mdr{font-weight:700;color:#6f42c1}.markdown-body .pl-ba{color:#586069}
.markdown-body .pl-sg{color:#959da5}.markdown-body .pl-corl{text-decoration:underline;
color:#032f62}.markdown-body .octicon{display:inline-block;fill:currentColor;vertical-align:text-bottom}
.markdown-body hr::after,.markdown-body hr::before,.markdown-body::after,
.markdown-body::before{display:table;content:\"\"}.markdown-body a{background-color:transparent;
color:#0366d6;text-decoration:none}.markdown-body a:active,.markdown-body a:hover{outline-width:0}
.markdown-body h1{margin:.67em 0}.markdown-body img{border-style:none}.markdown-body hr{box-sizing:content-box}
.markdown-body input{font:inherit;margin:0;overflow:visible;font-family:inherit;font-size:inherit;line-height:inherit}
.markdown-body dl dt,.markdown-body strong,.markdown-body table th{font-weight:600}.markdown-body code,
.markdown-body pre{font-family:SFMono-Regular,Consolas,\"Liberation Mono\",Menlo,Courier,monospace}
.markdown-body [type=checkbox]{box-sizing:border-box;padding:0}.markdown-body *{box-sizing:border-box}
.markdown-body a:hover{text-decoration:underline}.markdown-body td,.markdown-body th{padding:0}
.markdown-body blockquote{margin:0}.markdown-body ol ol,.markdown-body ul ol{list-style-type:lower-roman}
.markdown-body ol ol ol,.markdown-body ol ul ol,.markdown-body ul ol ol,.markdown-body
ul ul ol{list-style-type:lower-alpha}.markdown-body dd{margin-left:0}.markdown-body
.pl-0{padding-left:0!important}.markdown-body .pl-1{padding-left:4px!important}.markdown-body
.pl-2{padding-left:8px!important}.markdown-body .pl-3{padding-left:16px!important}.markdown-body
.pl-4{padding-left:24px!important}.markdown-body .pl-5{padding-left:32px!important}.markdown-body
.pl-6{padding-left:40px!important}.markdown-body>:first-child{margin-top:0!important}
.markdown-body>:last-child{margin-bottom:0!important}.markdown-body a:not([href]){color:inherit;
text-decoration:none}.markdown-body .anchor{float:left;padding-right:4px;margin-left:-20px;
line-height:1}.markdown-body .anchor:focus{outline:0}.markdown-body blockquote,
.markdown-body dl,.markdown-body ol,.markdown-body p,.markdown-body pre,.markdown-body table,
.markdown-body ul{margin-top:0;margin-bottom:16px}.markdown-body hr{overflow:hidden;background:#e1e4e8;
height:.25em;padding:0;margin:24px 0;border:0}.markdown-body blockquote{padding:0 1em;color:#6a737d;
border-left:.25em solid #dfe2e5}.markdown-body h1,.markdown-body h2{padding-bottom:.3em;
border-bottom:1px solid #eaecef}.markdown-body blockquote>:first-child{margin-top:0}
.markdown-body blockquote>:last-child{margin-bottom:0}.markdown-body h1,.markdown-body h2,
.markdown-body h3,.markdown-body h4,.markdown-body h5,.markdown-body h6{margin-top:24px;
margin-bottom:16px;font-weight:600;line-height:1.25}.markdown-body h1 .octicon-link,.markdown-body
h2 .octicon-link,.markdown-body h3 .octicon-link,.markdown-body h4 .octicon-link,.markdown-body
h5 .octicon-link,.markdown-body h6 .octicon-link{color:#1b1f23;vertical-align:middle;visibility:hidden}
.markdown-body h1:hover .anchor,.markdown-body h2:hover .anchor,.markdown-body h3:hover .anchor,
.markdown-body h4:hover .anchor,.markdown-body h5:hover .anchor,.markdown-body h6:hover .anchor{text-decoration:none}
.markdown-body h1:hover .anchor .octicon-link,.markdown-body h2:hover .anchor .octicon-link,.markdown-body
h3:hover .anchor .octicon-link,.markdown-body h4:hover .anchor .octicon-link,.markdown-body h5:hover .anchor
.octicon-link,.markdown-body h6:hover .anchor .octicon-link{visibility:visible}.markdown-body h1{font-size:2em}
.markdown-body h2{font-size:1.5em}.markdown-body h3{font-size:1.25em}.markdown-body h4{font-size:1em}.markdown-body
h5{font-size:.875em}.markdown-body h6{font-size:.85em;color:#6a737d}.markdown-body ol,.markdown-body ul{padding-left:2em}
.markdown-body ol ol,.markdown-body ol ul,.markdown-body ul ol,.markdown-body ul ul{margin-top:0;margin-bottom:0}
.markdown-body li{word-wrap:break-all}.markdown-body li>p{margin-top:16px}.markdown-body li+li{margin-top:.25em}
.markdown-body dl{padding:0}.markdown-body dl dt{padding:0;margin-top:16px;font-size:1em;font-style:italic}.markdown-body
dl dd{padding:0 16px;margin-bottom:16px}.markdown-body table{border-spacing:0;border-collapse:collapse;display:block;
width:100%;overflow:auto}.markdown-body table td,.markdown-body table th{padding:6px 13px;border:1px solid #dfe2e5}
.markdown-body table tr{background-color:#fff;border-top:1px solid #c6cbd1}.markdown-body table
tr:nth-child(2n){background-color:#f6f8fa}.markdown-body img{max-width:100%;box-sizing:content-box;background-color:#fff}
.markdown-body img[align=right]{padding-left:20px}.markdown-body img[align=left]{padding-right:20px}.markdown-body
code{padding:.2em .4em;margin:0;font-size:85%;background-color:rgba(27,31,35,.05);border-radius:3px}.markdown-body
pre{word-wrap:normal}.markdown-body pre>code{padding:0;margin:0;font-size:100%;word-break:normal;white-space:pre;background:0 0;
border:0}.markdown-body .highlight{margin-bottom:16px}.markdown-body .highlight pre{margin-bottom:0;word-break:normal}
.markdown-body .highlight pre,.markdown-body pre{padding:16px;overflow:auto;font-size:85%;line-height:1.45;
background-color:#f6f8fa;border-radius:3px}.markdown-body pre code{display:inline;max-width:auto;padding:0;margin:0;
overflow:visible;line-height:inherit;word-wrap:normal;background-color:transparent;border:0}.markdown-body
.full-commit .btn-outline:not(:disabled):hover{color:#005cc5;border-color:#005cc5}.markdown-body kbd{display:inline-block;
padding:3px 5px;font:11px SFMono-Regular,Consolas,\"Liberation Mono\",Menlo,Courier,monospace;line-height:10px;color:#444d56;
vertical-align:middle;background-color:#fafbfc;border:1px solid #d1d5da;border-bottom-color:#c6cbd1;border-radius:3px;
box-shadow:inset 0 -1px 0 #c6cbd1}.markdown-body :checked+.radio-label{position:relative;z-index:1;border-color:#0366d6}
.markdown-body .task-list-item{list-style-type:none}.markdown-body .task-list-item+.task-list-item{margin-top:3px}
.markdown-body .task-list-item input{margin:0 .2em .25em -1.6em;vertical-align:middle}.markdown-body hr{border-bottom-color:#eee}`
const darkstyle = `.markdown-body {color: #e8e8e8;background-color:#282828;box-sizing: border-box;min-width: 200px;max-width:
980px;margin: 0 auto;padding: 45px;} @media (max-width: 767px) {.markdown-body
{padding: 15px;}}.markdown-body hr::after,.markdown-body::after{clear:both}
@font-face{font-family:octicons-link;src:url(data:font/woff;charset=utf-8;
base64,d09GRgABAAAAAAZwABAAAAAACFQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABEU0lHAAAGa
AAAAAgAAAAIAAAAAUdTVUIAAAZcAAAACgAAAAoAAQAAT1MvMgAAAyQAAABJAAAAYFYEU3RjbWFwAA
ADcAAAAEUAAACAAJThvmN2dCAAAATkAAAABAAAAAQAAAAAZnBnbQAAA7gAAACyAAABCUM+8IhnYXN
wAAAGTAAAABAAAAAQABoAI2dseWYAAAFsAAABPAAAAZwcEq9taGVhZAAAAsgAAAA0AAAANgh4a91oa
GVhAAADCAAAABoAAAAkCA8DRGhtdHgAAAL8AAAADAAAAAwGAACfbG9jYQAAAsAAAAAIAAAACABiATBt
YXhwAAACqAAAABgAAAAgAA8ASm5hbWUAAAToAAABQgAAAlXu73sOcG9zdAAABiwAAAAeAAAAME3QpOB
wcmVwAAAEbAAAAHYAAAB/aFGpk3jaTY6xa8JAGMW/O62BDi0tJLYQincXEypYIiGJjSgHniQ6umTsUE
yLm5BV6NDBP8Tpts6F0v+k/0an2i+itHDw3v2+9+DBKTzsJNnWJNTgHEy4BgG3EMI9DCEDOGEXzDADU
5hBKMIgNPZqoD3SilVaXZCER3/I7AtxEJLtzzuZfI+VVkprxTlXShWKb3TBecG11rwoNlmmn1P2WYcJ
czl32etSpKnziC7lQyWe1smVPy/Lt7Kc+0vWY/gAgIIEqAN9we0pwKXreiMasxvabDQMM4riO+qxM2o
gwDGOZTXxwxDiycQIcoYFBLj5K3EIaSctAq2kTYiw+ymhce7vwM9jSqO8JyVd5RH9gyTt2+J/yUmYlI
R0s04n6+7Vm1ozezUeLEaUjhaDSuXHwVRgvLJn1tQ7xiuVv/ocTRF42mNgZGBgYGbwZOBiAAFGJBIMA
AizAFoAAABiAGIAznjaY2BkYGAA4in8zwXi+W2+MjCzMIDApSwvXzC97Z4Ig8N/BxYGZgcgl52BCSQK
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