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amfora/display/util.go

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Go
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package display
import (
"errors"
"net/url"
"reflect"
"strings"
"unsafe"
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"code.rocketnine.space/tslocum/cview"
"github.com/makeworld-the-better-one/go-gemini"
"github.com/spf13/viper"
"golang.org/x/text/unicode/norm"
)
// This file contains funcs that are small, self-contained utilities.
// makeContentLayout returns a flex that contains the given TextView
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// along with the provided left margin, as well as a single empty
// line at the top, for a top margin.
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func makeContentLayout(tv *cview.TextView, leftMargin int) *cview.Flex {
// Create horizontal flex with the left margin as an empty space
horiz := cview.NewFlex()
horiz.SetDirection(cview.FlexColumn)
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if leftMargin > 0 {
horiz.AddItem(nil, leftMargin, 0, false)
}
horiz.AddItem(tv, 0, 1, true)
// Create a vertical flex with the other one and a top margin
vert := cview.NewFlex()
vert.SetDirection(cview.FlexRow)
vert.AddItem(nil, 1, 0, false)
vert.AddItem(horiz, 0, 1, true)
return vert
}
// makeTabLabel takes a string and adds spacing to it, making it
// suitable for display as a tab label.
func makeTabLabel(s string) string {
return " " + s + " "
}
// tabNumber gets the index of the tab in the tabs slice. It returns -1
// if the tab is not in that slice.
func tabNumber(t *tab) int {
tempTabs := tabs
for i := range tempTabs {
if tempTabs[i] == t {
return i
}
}
return -1
}
// escapeMeta santizes a META string for use within a cview modal.
func escapeMeta(meta string) string {
return cview.Escape(strings.ReplaceAll(meta, "\n", ""))
}
// isValidTab indicates whether the passed tab is still being used, even if it's not currently displayed.
func isValidTab(t *tab) bool {
return tabNumber(t) != -1
}
func leftMargin() int {
return int(float64(termW) * viper.GetFloat64("a-general.left_margin"))
}
func textWidth() int {
if termW <= 0 {
// This prevent a flash of 1-column text on startup, when the terminal
// width hasn't been initialized.
return viper.GetInt("a-general.max_width")
}
rightMargin := leftMargin()
if leftMargin() > 10 {
// 10 is the max right margin
rightMargin = 10
}
max := termW - leftMargin() - rightMargin
if max < viper.GetInt("a-general.max_width") {
return max
}
return viper.GetInt("a-general.max_width")
}
// resolveRelLink returns an absolute link for the given relative link.
// It also returns an error if it could not resolve the links, which should be displayed
// to the user.
func (t *tab) resolveRelLink(next string) (string, error) {
if !t.hasContent() || t.isAnAboutPage() {
return next, nil
}
prevParsed, _ := url.Parse(t.page.URL)
nextParsed, err := url.Parse(next)
if err != nil {
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return "", errors.New("link URL could not be parsed") //nolint:goerr113
}
return prevParsed.ResolveReference(nextParsed).String(), nil
}
// normalizeURL attempts to make URLs that are different strings
// but point to the same place all look the same.
//
// Example: gemini://gus.guru:1965/ and //gus.guru/.
// This function will take both output the same URL each time.
//
// It will also percent-encode invalid characters, and decode chars
// that don't need to be encoded. It will also apply Unicode NFC
// normalization.
//
// The string passed must already be confirmed to be a URL.
// Detection of a search string vs. a URL must happen elsewhere.
//
// It only works with absolute URLs.
func normalizeURL(u string) string {
u = norm.NFC.String(u)
tmp, err := gemini.GetPunycodeURL(u)
if err != nil {
return u
}
u = tmp
parsed, _ := url.Parse(u)
if parsed.Scheme == "" {
// Always add scheme
parsed.Scheme = "gemini"
} else if parsed.Scheme != "gemini" {
// Not a gemini URL, nothing to do
return u
}
parsed.User = nil // No passwords in Gemini
parsed.Fragment = "" // No fragments either
if parsed.Port() == "1965" {
// Always remove default port
hostname := parsed.Hostname()
if strings.Contains(hostname, ":") {
parsed.Host = "[" + parsed.Hostname() + "]"
} else {
parsed.Host = parsed.Hostname()
}
}
// Add slash to the end of a URL with just a domain
// gemini://example.com -> gemini://example.com/
if parsed.Path == "" {
parsed.Path = "/"
} else {
// Decode and re-encode path
// This removes needless encoding, like that of ASCII chars
// And encodes anything that wasn't but should've been
parsed.RawPath = strings.ReplaceAll(url.PathEscape(parsed.Path), "%2F", "/")
}
// Do the same to the query string
un, err := gemini.QueryUnescape(parsed.RawQuery)
if err == nil {
parsed.RawQuery = gemini.QueryEscape(un)
}
return parsed.String()
}
// fixUserURL will take a user-typed URL and add a gemini scheme to it if
// necessary. It is not the same as normalizeURL, and that func should still
// be used, afterward.
//
// For example "example.com" will become "gemini://example.com", but
// "//example.com" will be left untouched.
func fixUserURL(u string) string {
if !strings.HasPrefix(u, "//") && !strings.HasPrefix(u, "gemini://") && !strings.Contains(u, "://") {
// Assume it's a Gemini URL
u = "gemini://" + u
}
return u
}
func stringToBytes(s string) []byte {
// Sources:
// https://stackoverflow.com/a/59210739
// https://groups.google.com/g/golang-nuts/c/Zsfk-VMd_fU/m/O1ru4fO-BgAJ
return (*[0x7fff0000]byte)(unsafe.Pointer((*reflect.StringHeader)(unsafe.Pointer(&s)).Data))[:len(s):len(s)]
}