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package display
import (
"errors"
"net/url"
"strings"
"code.rocketnine.space/tslocum/cview"
"github.com/spf13/viper"
)
// This file contains funcs that are small, self-contained utilities.
// makeContentLayout returns a flex that contains the given TextView
// along with the provided left margin, as well as a single empty
// line at the top, for a top margin.
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)
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
}
// 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 sanitizes 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 the left margin size that centers the text, assuming it's the max width
// https://github.com/makeworld-the-better-one/amfora/issues/233
lm := (termW - viper.GetInt("a-general.max_width")) / 2
if lm < 0 {
return 0
}
return lm
}
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")
}
// Subtract left and right margin from total width to get text width
// Left and right margin are equal because text is automatically centered, see:
// https://github.com/makeworld-the-better-one/amfora/issues/233
max := termW - leftMargin()*2
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 absolute link and relative one.
// It also returns an error if it could not resolve the links, which should be displayed
// to the user.
func resolveRelLink(t *tab, prev, next string) (string, error) {
if !t.hasContent() || t.isAnAboutPage() {
return next, nil
}
prevParsed, _ := url.Parse(prev)
nextParsed, err := url.Parse(next)
if err != nil {
return "", errors.New("link URL could not be parsed") //nolint:goerr113
}
return prevParsed.ResolveReference(nextParsed).String(), nil
}
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