Support all bare modifiers1.0.0

1 files changed, 28 insertions, 1 deletions

diff --git a/Sources/NorgKeyboardToolbar/EditorSnippet.swift b/Sources/NorgKeyboardToolbar/EditorSnippet.swift
index b87d2b1..4773eac 100644
--- a/Sources/NorgKeyboardToolbar/EditorSnippet.swift
+++ b/Sources/NorgKeyboardToolbar/EditorSnippet.swift
@@ -29,7 +29,7 @@ enum EditorSnippet: String, CaseIterable, Identifiable, Sendable {
     switch self {
     case .heading where isInBareMarker(characters, at: position, markers: ["*"]):
       return promoteHeading(characters, at: position)
-    case .task where isInBareMarker(characters, at: position, markers: ["*", "~"]):
+    case .task where isInBareDetachedModifier(characters, at: position):
       return addTask(toMarker: characters, at: position)
     default:
       return insertOnNewLine(in: characters, cursor: position)
@@ -38,6 +38,11 @@ enum EditorSnippet: String, CaseIterable, Identifiable, Sendable {
 
   // MARK: - Marker-aware behaviours
 
+  /// The detached-modifier markers that can carry a task status, matching
+  /// NorgKit's task scanner. Any of these — headings, un/ordered lists,
+  /// quotes, definitions, footnotes — may be turned into a task in place.
+  private static let detachedModifierMarkers: Set<Character> = ["*", "-", "~", ">", "$", "^", ":"]
+
   /// Whether the is at a position with only `markers` and spaces, and contains
   /// at least one marker.
   private func isInBareMarker(_ characters: [Character], at position: Int, markers: Set<Character>)
@@ -48,6 +53,28 @@ enum EditorSnippet: String, CaseIterable, Identifiable, Sendable {
       && prefix.allSatisfy { markers.contains($0) || $0 == " " }
   }
 
+  /// Whether the cursor sits just past a bare detached modifier: leading
+  /// spaces, a run of a single marker, then at least one space, with nothing
+  /// else before the cursor. The trailing space requirement keeps delimiters
+  /// such as `---` (which carry no whitespace) from being treated as tasks.
+  private func isInBareDetachedModifier(_ characters: [Character], at position: Int) -> Bool {
+    let lineStart = LineScanner.lineStart(in: characters, at: position)
+    var index = lineStart
+    while index < position, characters[index] == " " { index += 1 }
+
+    guard index < position, Self.detachedModifierMarkers.contains(characters[index]) else {
+      return false
+    }
+    let marker = characters[index]
+    while index < position, characters[index] == marker { index += 1 }
+
+    // A space must separate the marker run from the cursor, and the cursor may
+    // only sit within that run of separating spaces (i.e. before any content).
+    guard index < position, characters[index] == " " else { return false }
+    while index < position, characters[index] == " " { index += 1 }
+    return index == position
+  }
+
   /// Adds a `*` after the leading run of spaces and stars on the cursor's line.
   private func promoteHeading(_ characters: [Character], at position: Int) -> (
     text: String, cursor: Int