wehub-resource-sync
60 lines
2.7 KiB
Swift
60 lines
2.7 KiB
Swift
import AppKit
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// MARK: - Block-quote / Callout Continuation on Enter
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//
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// Pressing Return inside a block quote (including a callout) repeats the quote
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// prefix on the next line — `> ` — so the quote/callout keeps going, the same
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// way list items auto-continue. Pressing Return on an *empty* quote line removes
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// the prefix and breaks out of the quote.
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extension EditorTextView {
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/// Leading indent + one or more `>` levels (each with an optional single
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/// space), at the start of a line. Captures the *full* nesting depth so a
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/// nested callout/quote line `> > …` continues as `> > `, not `> `.
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private static let blockquotePrefixRegex = try! NSRegularExpression(
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pattern: #"^[ \t]*(?:>[ \t]?)+"#
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)
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/// Continues a block quote / callout on Return. Returns true if it handled
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/// the newline.
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func handleBlockquoteNewline(at location: Int) -> Bool {
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let ns = rawSource as NSString
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guard location <= ns.length else { return false }
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// The line containing the cursor (without its trailing newline).
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let lineRange = ns.lineRange(for: NSRange(location: location, length: 0))
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var lineEnd = lineRange.upperBound
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if lineEnd > lineRange.location, ns.character(at: lineEnd - 1) == 0x0A { lineEnd -= 1 }
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let lineStart = lineRange.location
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let line = ns.substring(with: NSRange(location: lineStart, length: lineEnd - lineStart))
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let lineNS = line as NSString
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guard let m = Self.blockquotePrefixRegex.firstMatch(
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in: line, range: NSRange(location: 0, length: lineNS.length)) else { return false }
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let prefix = lineNS.substring(with: m.range)
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let hasContent = m.range.length < lineNS.length
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if hasContent {
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// Continue the quote/callout at the same depth: newline + same prefix.
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insertText("\n" + prefix, replacementRange: NSRange(location: location, length: 0))
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} else {
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// Empty quote line → step out one nesting level (drop the last `>`).
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// At the top level this empties the line, breaking out of the quote.
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insertText(Self.reduceQuotePrefix(prefix),
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replacementRange: NSRange(location: lineStart, length: lineEnd - lineStart))
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}
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return true
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}
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/// Drops the deepest `>` level from a quote prefix: `> > ` → `> `,
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/// ` > ` → ` ` (indent kept), `> ` → `` (broken out).
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static func reduceQuotePrefix(_ prefix: String) -> String {
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let ns = prefix as NSString
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let lastGT = ns.range(of: ">", options: .backwards)
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guard lastGT.location != NSNotFound else { return "" }
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return ns.substring(to: lastGT.location)
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}
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}
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