mirror of
https://github.com/makew0rld/amfora.git
synced 2024-12-04 14:46:29 -05:00
261 lines
8.6 KiB
Go
261 lines
8.6 KiB
Go
// 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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urlPkg "net/url"
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"strconv"
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"strings"
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"github.com/spf13/viper"
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"gitlab.com/tslocum/cview"
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)
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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) + lines[i] + "\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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// 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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if strings.HasPrefix(lines[i], "#") {
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// Headings
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if viper.GetBool("a-general.color") {
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if strings.HasPrefix(lines[i], "###") {
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wrappedLines = append(wrappedLines, wrapLine(lines[i], width, "[fuchsia::b]", "[-::-]", true)...)
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} else if strings.HasPrefix(lines[i], "##") {
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wrappedLines = append(wrappedLines, wrapLine(lines[i], width, "[lime::b]", "[-::-]", true)...)
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} else if strings.HasPrefix(lines[i], "#") {
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wrappedLines = append(wrappedLines, wrapLine(lines[i], width, "[red::b]", "[-::-]", true)...)
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}
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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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// 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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var wrappedLink []string
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if viper.GetBool("a-general.color") {
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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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wrappedLink = wrapLine(linkText, width,
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strings.Repeat(" ", len(strconv.Itoa(numLinks+len(links)))+4)+ // +4 for spaces and brackets
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`["`+strconv.Itoa(numLinks+len(links)-1)+`"][dodgerblue]`,
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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] = `[silver::b][` + strconv.Itoa(numLinks+len(links)) + "[]" + "[-::-] " +
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`["` + strconv.Itoa(numLinks+len(links)-1) + `"][dodgerblue]` +
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wrappedLink[0] + `[-][""]`
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} else {
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// Not a gemini link, use purple instead
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wrappedLink = wrapLine(linkText, width,
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strings.Repeat(" ", len(strconv.Itoa(numLinks+len(links)))+4)+ // +4 for spaces and brackets
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`["`+strconv.Itoa(numLinks+len(links)-1)+`"][#8700d7]`,
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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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wrappedLink[0] = `[silver::b][` + strconv.Itoa(numLinks+len(links)) + "[]" + "[-::-] " +
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`["` + strconv.Itoa(numLinks+len(links)-1) + `"][#8700d7]` +
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wrappedLink[0] + `[-][""]`
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}
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} else {
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// No colours allowed
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wrappedLink = wrapLine(linkText, width,
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strings.Repeat(" ", len(strconv.Itoa(numLinks+len(links)))+4)+ // +4 for spaces and brackets
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`["`+strconv.Itoa(numLinks+len(links)-1)+`"]`,
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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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wrappedLink[0] = `[::b][` + strconv.Itoa(numLinks+len(links)) + "[][::-] " +
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`["` + strconv.Itoa(numLinks+len(links)-1) + `"]` +
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wrappedLink[0] + `[""]`
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}
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wrappedLines = append(wrappedLines, wrappedLink...)
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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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// Wrap list item, and indent wrapped lines past the bullet
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wrappedItem := wrapLine(lines[i][1:], width, " ", "", false)
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// Add bullet
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wrappedItem[0] = " \u2022" + wrappedItem[0]
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wrappedLines = append(wrappedLines, wrappedItem...)
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}
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// Optionally list lines could be colored here too, if color is enabled
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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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// 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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wrappedLines = append(wrappedLines, wrapLine(lines[i], width, "> [::i]", "[::-]", true)...)
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} else if strings.TrimSpace(lines[i]) == "" {
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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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// Regular line, just wrap it
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wrappedLines = append(wrappedLines, wrapLine(lines[i], width, "", "", true)...)
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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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// RenderGemini converts text/gemini into a cview displayable format.
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// It also returns a slice of link URLs.
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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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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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rendered += buf
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} else {
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// Not preformatted, regular text
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ren, lks := convertRegularGemini(buf, len(links), width)
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links = append(links, lks...)
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rendered += ren
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}
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buf = "" // Clear buffer for next block
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pre = !pre
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continue
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}
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// Lines always end with \r\n for Windows compatibility
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buf += strings.TrimSuffix(lines[i], "\r") + "\r\n"
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}
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// Gone through all the lines, but there still is likely a block in the buffer
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if pre {
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// File ended without closing the preformatted block
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rendered += buf
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} else {
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// Not preformatted, regular text
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// Same code as in the loop above
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ren, lks := convertRegularGemini(buf, len(links), width)
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links = append(links, lks...)
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rendered += ren
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}
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if leftMargin > 0 {
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renLines := strings.Split(rendered, "\n")
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for i := range renLines {
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renLines[i] = strings.Repeat(" ", leftMargin) + renLines[i]
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}
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return strings.Join(renLines, "\n"), links
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}
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return rendered, links
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}
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