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examples/html: Read from stdin and write to stdout

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This commit is contained in:
Adnan Maolood 2020-12-18 00:45:09 -05:00
parent 36c2086c82
commit 5af1acbd54
1 changed files with 65 additions and 64 deletions
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91
examples/html.go
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@ -7,76 +7,77 @@ package main
import (
"fmt"
"html"
"strings"
"io"
"os"
"git.sr.ht/~adnano/go-gemini"
)
func main() {
text := gemini.Text{
gemini.LineHeading1("Hello, world!"),
gemini.LineText("This is a gemini text document."),
hw := HTMLWriter{
out: os.Stdout,
}
html := textToHTML(text)
fmt.Print(html)
gemini.ParseLines(os.Stdin, hw.Handle)
hw.Finish()
}
// textToHTML returns the Gemini text response as HTML.
func textToHTML(text gemini.Text) string {
var b strings.Builder
var pre bool
var list bool
for _, l := range text {
if _, ok := l.(gemini.LineListItem); ok {
if !list {
list = true
fmt.Fprint(&b, "<ul>\n")
type HTMLWriter struct {
out io.Writer
pre bool
list bool
}
func (h *HTMLWriter) Handle(line gemini.Line) {
if _, ok := line.(gemini.LineListItem); ok {
if !h.list {
h.list = true
fmt.Fprint(h.out, "<ul>\n")
}
} else if list {
list = false
fmt.Fprint(&b, "</ul>\n")
} else if h.list {
h.list = false
fmt.Fprint(h.out, "</ul>\n")
}
switch l := l.(type) {
switch line := line.(type) {
case gemini.LineLink:
url := html.EscapeString(l.URL)
name := html.EscapeString(l.Name)
url := html.EscapeString(line.URL)
name := html.EscapeString(line.Name)
if name == "" {
name = url
}
fmt.Fprintf(&b, "<p><a href='%s'>%s</a></p>\n", url, name)
fmt.Fprintf(h.out, "<p><a href='%s'>%s</a></p>\n", url, name)
case gemini.LinePreformattingToggle:
pre = !pre
if pre {
fmt.Fprint(&b, "<pre>\n")
h.pre = !h.pre
if h.pre {
fmt.Fprint(h.out, "<pre>\n")
} else {
fmt.Fprint(&b, "</pre>\n")
fmt.Fprint(h.out, "</pre>\n")
}
case gemini.LinePreformattedText:
fmt.Fprintf(&b, "%s\n", html.EscapeString(string(l)))
fmt.Fprintf(h.out, "%s\n", html.EscapeString(string(line)))
case gemini.LineHeading1:
fmt.Fprintf(&b, "<h1>%s</h1>\n", html.EscapeString(string(l)))
fmt.Fprintf(h.out, "<h1>%s</h1>\n", html.EscapeString(string(line)))
case gemini.LineHeading2:
fmt.Fprintf(&b, "<h2>%s</h2>\n", html.EscapeString(string(l)))
fmt.Fprintf(h.out, "<h2>%s</h2>\n", html.EscapeString(string(line)))
case gemini.LineHeading3:
fmt.Fprintf(&b, "<h3>%s</h3>\n", html.EscapeString(string(l)))
fmt.Fprintf(h.out, "<h3>%s</h3>\n", html.EscapeString(string(line)))
case gemini.LineListItem:
fmt.Fprintf(&b, "<li>%s</li>\n", html.EscapeString(string(l)))
fmt.Fprintf(h.out, "<li>%s</li>\n", html.EscapeString(string(line)))
case gemini.LineQuote:
fmt.Fprintf(&b, "<blockquote>%s</blockquote>\n", html.EscapeString(string(l)))
fmt.Fprintf(h.out, "<blockquote>%s</blockquote>\n", html.EscapeString(string(line)))
case gemini.LineText:
if l == "" {
fmt.Fprint(&b, "<br>\n")
if line == "" {
fmt.Fprint(h.out, "<br>\n")
} else {
fmt.Fprintf(&b, "<p>%s</p>\n", html.EscapeString(string(l)))
fmt.Fprintf(h.out, "<p>%s</p>\n", html.EscapeString(string(line)))
}
}
}
if pre {
fmt.Fprint(&b, "</pre>\n")
}
if list {
fmt.Fprint(&b, "</ul>\n")
}
return b.String()
}
func (h *HTMLWriter) Finish() {
if h.pre {
fmt.Fprint(h.out, "</pre>\n")
}
if h.list {
fmt.Fprint(h.out, "</ul>\n")
}
}