2020-06-18 16:54:48 -04:00
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// Package renderer provides functions to convert various data into a cview primitive.
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// Example objects include a Gemini response, and an error.
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//
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// Rendered lines always end with \r\n, in an effort to be Window compatible.
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package renderer
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import (
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"fmt"
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urlPkg "net/url"
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"strconv"
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"strings"
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"github.com/makeworld-the-better-one/amfora/config"
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"github.com/spf13/viper"
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"gitlab.com/tslocum/cview"
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)
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2020-07-10 17:45:14 -04:00
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// RenderANSI renders plain text pages containing ANSI codes.
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// Practically, it is used for the text/x-ansi.
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func RenderANSI(s string, leftMargin int) string {
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s = cview.Escape(s)
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if viper.GetBool("a-general.color") {
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s = cview.TranslateANSI(s)
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}
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var shifted string
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lines := strings.Split(s, "\n")
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for i := range lines {
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shifted += strings.Repeat(" ", leftMargin) + lines[i] + "\n"
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}
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return shifted
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}
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2020-07-03 17:28:56 -04:00
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// RenderPlainText should be used to format plain text pages.
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func RenderPlainText(s string, leftMargin int) string {
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var shifted string
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lines := strings.Split(cview.Escape(s), "\n")
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for i := range lines {
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shifted += strings.Repeat(" ", leftMargin) +
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"[" + config.GetColorString("regular_text") + "]" + lines[i] + "[-]" +
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"\n"
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}
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return shifted
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}
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// wrapLine wraps a line to the provided width, and adds the provided prefix and suffix to each wrapped line.
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// It recovers from wrapping panics and should never cause a panic.
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// It returns a slice of lines, without newlines at the end.
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//
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// Set includeFirst to true if the prefix and suffix should be applied to the first wrapped line as well
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func wrapLine(line string, width int, prefix, suffix string, includeFirst bool) []string {
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// Anonymous function to allow recovery from potential WordWrap panic
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var ret []string
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func() {
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defer func() {
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if r := recover(); r != nil {
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// Use unwrapped line instead
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if includeFirst {
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ret = []string{prefix + line + suffix}
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} else {
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ret = []string{line}
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}
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}
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}()
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wrapped := cview.WordWrap(line, width)
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for i := range wrapped {
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if !includeFirst && i == 0 {
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continue
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}
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wrapped[i] = prefix + wrapped[i] + suffix
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}
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ret = wrapped
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}()
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return ret
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}
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// tagLines splits a string into lines and adds a the given
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// string to the start and another to the end.
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// It is used for adding cview color tags.
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func tagLines(s, start, end string) string {
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lines := strings.Split(s, "\n")
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for i := range lines {
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lines[i] = start + lines[i] + end
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}
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return strings.Join(lines, "\n")
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}
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// convertRegularGemini converts non-preformatted blocks of text/gemini
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// into a cview-compatible format.
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// It also returns a slice of link URLs.
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// numLinks is the number of links that exist so far.
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// width is the number of columns to wrap to.
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//
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// Since this only works on non-preformatted blocks, RenderGemini
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// should always be used instead.
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func convertRegularGemini(s string, numLinks, width int) (string, []string) {
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links := make([]string, 0)
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lines := strings.Split(s, "\n")
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wrappedLines := make([]string, 0) // Final result
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for i := range lines {
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lines[i] = strings.TrimRight(lines[i], " \r\t\n")
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2020-08-28 12:18:30 -04:00
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if strings.HasPrefix(lines[i], "#") {
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// Headings
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var tag string
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if viper.GetBool("a-general.color") {
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if strings.HasPrefix(lines[i], "###") {
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tag = fmt.Sprintf("[%s::b]", config.GetColorString("hdg_3"))
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} else if strings.HasPrefix(lines[i], "##") {
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tag = fmt.Sprintf("[%s::b]", config.GetColorString("hdg_2"))
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} else if strings.HasPrefix(lines[i], "#") {
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tag = fmt.Sprintf("[%s::b]", config.GetColorString("hdg_1"))
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}
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wrappedLines = append(wrappedLines, wrapLine(lines[i], width, tag, "[-::-]", true)...)
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} else {
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// Just bold, no colors
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wrappedLines = append(wrappedLines, wrapLine(lines[i], width, "[::b]", "[-::-]", true)...)
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}
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// Links
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} else if strings.HasPrefix(lines[i], "=>") && len([]rune(lines[i])) >= 3 {
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// Trim whitespace and separate link from link text
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lines[i] = strings.Trim(lines[i][2:], " \t") // Remove `=>` part too
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delim := strings.IndexAny(lines[i], " \t") // Whitespace between link and link text
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var url string
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var linkText string
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if delim == -1 {
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// No link text
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url = lines[i]
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linkText = url
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} else {
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// There is link text
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url = lines[i][:delim]
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linkText = strings.Trim(lines[i][delim:], " \t")
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}
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if strings.TrimSpace(lines[i]) == "" || strings.TrimSpace(url) == "" {
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// Link was just whitespace, reset it and move on
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lines[i] = "=>"
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wrappedLines = append(wrappedLines, lines[i])
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continue
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}
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links = append(links, url)
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num := numLinks + len(links) // Visible link number, one-indexed
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var indent int
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if num > 99 {
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// Indent link text by 3 or more spaces
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indent = len(strconv.Itoa(num)) + 4 // +4 indent for spaces and brackets
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} else {
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// One digit and two digit links have the same spacing - see #60
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indent = 5 // +4 indent for spaces and brackets, and 1 for link number
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}
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// Spacing after link number: 1 or 2 spaces?
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var spacing string
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if num > 9 {
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// One space to keep it in line with other links - see #60
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spacing = " "
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} else {
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// One digit numbers use two spaces
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spacing = " "
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}
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2020-07-03 14:02:33 -04:00
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// Wrap and add link text
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// Wrap the link text, but add some spaces to indent the wrapped lines past the link number
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// Set the style tags
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// Add them to the first line
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2020-07-09 15:21:09 -04:00
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var wrappedLink []string
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2020-06-18 16:54:48 -04:00
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if viper.GetBool("a-general.color") {
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2020-06-23 20:07:25 -04:00
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pU, err := urlPkg.Parse(url)
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if err == nil && (pU.Scheme == "" || pU.Scheme == "gemini" || pU.Scheme == "about") {
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// A gemini link
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// Add the link text in blue (in a region), and a gray link number to the left of it
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// Those are the default colors, anyway
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wrappedLink = wrapLine(linkText, width,
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strings.Repeat(" ", indent)+
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`["`+strconv.Itoa(num-1)+`"][`+config.GetColorString("amfora_link")+`]`,
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`[-][""]`,
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false, // Don't indent the first line, it's the one with link number
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)
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// Add special stuff to first line, like the link number
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wrappedLink[0] = fmt.Sprintf(`[%s::b][`, config.GetColorString("link_number")) +
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strconv.Itoa(num) + "[]" + "[-::-]" + spacing +
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`["` + strconv.Itoa(num-1) + `"][` + config.GetColorString("amfora_link") + `]` +
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wrappedLink[0] + `[-][""]`
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} else {
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// Not a gemini link
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wrappedLink = wrapLine(linkText, width,
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strings.Repeat(" ", indent)+
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`["`+strconv.Itoa(num-1)+`"][`+config.GetColorString("foreign_link")+`]`,
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2020-07-09 15:21:09 -04:00
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`[-][""]`,
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false, // Don't indent the first line, it's the one with link number
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)
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2020-07-28 16:58:32 -04:00
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wrappedLink[0] = fmt.Sprintf(`[%s::b][`, config.GetColorString("link_number")) +
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strconv.Itoa(num) + "[]" + "[-::-]" + spacing +
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`["` + strconv.Itoa(num-1) + `"][` + config.GetColorString("foreign_link") + `]` +
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wrappedLink[0] + `[-][""]`
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2020-06-18 16:54:48 -04:00
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}
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} else {
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2020-07-28 16:58:32 -04:00
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// No colors allowed
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2020-07-09 15:21:09 -04:00
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wrappedLink = wrapLine(linkText, width,
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2020-08-04 20:44:43 -04:00
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strings.Repeat(" ", len(strconv.Itoa(num))+4)+ // +4 for spaces and brackets
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`["`+strconv.Itoa(num-1)+`"]`,
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2020-07-09 15:21:09 -04:00
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`[""]`,
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false, // Don't indent the first line, it's the one with link number
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)
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2020-08-04 20:44:43 -04:00
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wrappedLink[0] = `[::b][` + strconv.Itoa(num) + "[][::-] " +
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`["` + strconv.Itoa(num-1) + `"]` +
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2020-07-09 15:21:09 -04:00
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wrappedLink[0] + `[""]`
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2020-06-18 16:54:48 -04:00
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}
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2020-07-03 14:02:33 -04:00
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wrappedLines = append(wrappedLines, wrappedLink...)
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2020-06-18 16:54:48 -04:00
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// Lists
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} else if strings.HasPrefix(lines[i], "* ") {
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if viper.GetBool("a-general.bullets") {
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2020-07-03 14:02:33 -04:00
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// Wrap list item, and indent wrapped lines past the bullet
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2020-07-28 16:58:32 -04:00
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wrappedItem := wrapLine(lines[i][1:], width,
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fmt.Sprintf(" [%s]", config.GetColorString("list_text")),
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"[-]", false)
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2020-07-03 14:02:33 -04:00
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// Add bullet
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2020-07-28 16:58:32 -04:00
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wrappedItem[0] = fmt.Sprintf(" [%s]\u2022", config.GetColorString("list_text")) +
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wrappedItem[0] + "[-]"
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2020-07-03 14:02:33 -04:00
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wrappedLines = append(wrappedLines, wrappedItem...)
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2020-06-18 16:54:48 -04:00
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}
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// Optionally list lines could be colored here too, if color is enabled
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2020-07-03 14:02:33 -04:00
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} else if strings.HasPrefix(lines[i], ">") {
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// It's a quote line, add extra quote symbols and italics to the start of each wrapped line
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2020-06-18 16:54:48 -04:00
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2020-07-03 14:02:33 -04:00
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// Remove beginning quote and maybe space
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lines[i] = strings.TrimPrefix(lines[i], ">")
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lines[i] = strings.TrimPrefix(lines[i], " ")
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2020-07-28 16:58:32 -04:00
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wrappedLines = append(wrappedLines,
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wrapLine(lines[i], width, fmt.Sprintf("[%s::i]> ", config.GetColorString("quote_text")),
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"[-::-]", true)...,
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)
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2020-06-18 16:54:48 -04:00
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2020-07-03 14:02:33 -04:00
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} else if strings.TrimSpace(lines[i]) == "" {
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2020-06-18 16:54:48 -04:00
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// Just add empty line without processing
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wrappedLines = append(wrappedLines, "")
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} else {
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2020-07-03 14:02:33 -04:00
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// Regular line, just wrap it
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2020-07-28 16:58:32 -04:00
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wrappedLines = append(wrappedLines, wrapLine(lines[i], width,
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fmt.Sprintf("[%s]", config.GetColorString("regular_text")),
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"[-]", true)...)
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2020-06-18 16:54:48 -04:00
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}
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}
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return strings.Join(wrappedLines, "\r\n"), links
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}
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2020-06-21 16:53:12 -04:00
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// RenderGemini converts text/gemini into a cview displayable format.
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2020-06-18 16:54:48 -04:00
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// It also returns a slice of link URLs.
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2020-07-02 23:55:24 -04:00
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//
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// width is the number of columns to wrap to.
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// leftMargin is the number of blank spaces to prepend to each line.
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func RenderGemini(s string, width, leftMargin int) (string, []string) {
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2020-06-18 16:54:48 -04:00
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s = cview.Escape(s)
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if viper.GetBool("a-general.color") {
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s = cview.TranslateANSI(s)
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}
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lines := strings.Split(s, "\n")
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links := make([]string, 0)
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// Process and wrap non preformatted lines
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rendered := "" // Final result
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pre := false
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buf := "" // Block of regular or preformatted lines
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for i := range lines {
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if strings.HasPrefix(lines[i], "```") {
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if pre {
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// In a preformatted block, so add the text as is
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// Don't add the current line with backticks
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2020-07-28 16:58:32 -04:00
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rendered += tagLines(
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buf,
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fmt.Sprintf("[%s]", config.GetColorString("preformatted_text")),
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"[-]",
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)
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2020-06-18 16:54:48 -04:00
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} else {
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// Not preformatted, regular text
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2020-06-21 16:53:12 -04:00
|
|
|
ren, lks := convertRegularGemini(buf, len(links), width)
|
2020-06-18 16:54:48 -04:00
|
|
|
links = append(links, lks...)
|
|
|
|
rendered += ren
|
|
|
|
}
|
|
|
|
buf = "" // Clear buffer for next block
|
|
|
|
pre = !pre
|
|
|
|
continue
|
|
|
|
}
|
|
|
|
// Lines always end with \r\n for Windows compatibility
|
|
|
|
buf += strings.TrimSuffix(lines[i], "\r") + "\r\n"
|
|
|
|
}
|
|
|
|
// Gone through all the lines, but there still is likely a block in the buffer
|
|
|
|
if pre {
|
|
|
|
// File ended without closing the preformatted block
|
|
|
|
rendered += buf
|
|
|
|
} else {
|
|
|
|
// Not preformatted, regular text
|
|
|
|
// Same code as in the loop above
|
2020-06-21 16:53:12 -04:00
|
|
|
ren, lks := convertRegularGemini(buf, len(links), width)
|
2020-06-18 16:54:48 -04:00
|
|
|
links = append(links, lks...)
|
|
|
|
rendered += ren
|
|
|
|
}
|
|
|
|
|
2020-07-02 23:55:24 -04:00
|
|
|
if leftMargin > 0 {
|
|
|
|
renLines := strings.Split(rendered, "\n")
|
|
|
|
for i := range renLines {
|
|
|
|
renLines[i] = strings.Repeat(" ", leftMargin) + renLines[i]
|
|
|
|
}
|
|
|
|
return strings.Join(renLines, "\n"), links
|
|
|
|
}
|
|
|
|
|
2020-06-18 16:54:48 -04:00
|
|
|
return rendered, links
|
|
|
|
}
|