jcoffey-dev
a8f0227a58
Pagination for lists and tag pages; tag spellings merged regardless of hyphens and #, labelled by the spelling used most, with term_index_min for thin pages; redirects as fallback pages plus 301 rules in container images; RSS 2.0 feeds; markdown autolink, external_links: new_tab and trust_html; reading time and summaries computed from the Markdown; a page's lead image for its social card; per-collection search indexes; and template helpers (excerpt, termURL, formatDate, fileHash, imageSize, pageAt, concat, cond, email_off markers).
47 lines
1.4 KiB
Go
47 lines
1.4 KiB
Go
package site
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import (
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"regexp"
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"strings"
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)
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var (
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plainFenceRe = regexp.MustCompile("(?s)```.*?```")
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plainImageRe = regexp.MustCompile(`!\[[^\]]*\]\([^)]*\)`)
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plainLinkRe = regexp.MustCompile(`\[([^\]]*)\]\([^)]*\)`)
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plainTagRe = regexp.MustCompile(`<[^>]+>`)
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plainMarkRe = regexp.MustCompile("[#>*_`~]+")
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plainSpaceRe = regexp.MustCompile(`\s+`)
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wordRe = regexp.MustCompile(`\p{L}[\p{L}'\-]*`)
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)
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// PlainMarkdown strips Markdown to bare words: no code blocks, images, link
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// targets, HTML tags or emphasis marks.
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func PlainMarkdown(md string) string {
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s := plainFenceRe.ReplaceAllString(md, " ")
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s = plainImageRe.ReplaceAllString(s, " ")
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s = plainLinkRe.ReplaceAllString(s, "$1")
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s = plainTagRe.ReplaceAllString(s, " ")
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s = plainMarkRe.ReplaceAllString(s, "")
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return strings.TrimSpace(plainSpaceRe.ReplaceAllString(s, " "))
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}
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// CountWords counts words the way a reader would: runs of letters, with
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// apostrophes and hyphens allowed inside a word.
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func CountWords(s string) int { return len(wordRe.FindAllStringIndex(s, -1)) }
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// Excerpt is the plain text of some Markdown, cut at a word boundary to at
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// most limit characters, with an ellipsis if anything was cut.
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func Excerpt(limit int, md string) string {
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s := PlainMarkdown(md)
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r := []rune(s)
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if len(r) <= limit {
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return s
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}
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cut := string(r[:limit])
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if i := strings.LastIndex(cut, " "); i > 0 {
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cut = cut[:i]
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}
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return strings.TrimRight(cut, " ,;:.") + "…"
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}
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