Extract from Norganizer

12 files changed, 1203 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..d2c5c89
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,9 @@
+.DS_Store
+/.build
+/Packages
+xcuserdata/
+DerivedData/
+.swiftpm/configuration/registries.json
+.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
+.netrc
+*.profraw
diff --git a/Justfile b/Justfile
new file mode 100644
index 0000000..427d8a3
--- /dev/null
+++ b/Justfile
@@ -0,0 +1,25 @@
+profile := "debug"
+
+default: build
+
+build:
+    swift build -c {{profile}}
+
+test:
+    swift test
+
+coverage:
+    swift test --enable-code-coverage
+    xcrun llvm-cov report \
+      .build/debug/NorgKeyboardToolbarTests.xctest/Contents/MacOS/NorgKeyboardToolbarTests \
+      -instr-profile=.build/debug/codecov/default.profdata \
+      --ignore-filename-regex='\.build|NorgKeyboardToolbar\.swift'
+
+format:
+    swift-format --in-place --recursive Sources Tests
+    swiftlint --fix Sources Tests
+
+lint:
+    swiftlint Sources Tests
+
+ci: lint test
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..a06062d
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,661 @@
+GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
+
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+ Everyone is permitted to copy and distribute verbatim copies
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+
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+  Developers that use our General Public Licenses protect your rights
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+Foundation.  If the Program does not specify a version number of the
+GNU Affero General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU Affero General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    norg-keyboard-toolbar, A keyboard toolbar for norg file editing in swift
+    Copyright (C) 2026  Ruben Beltran del Rio
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published
+    by the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
+get its source.  For example, if your program is a web application, its
+interface could display a "Source" link that leads users to an archive
+of the code.  There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<https://www.gnu.org/licenses/>.
diff --git a/Package.swift b/Package.swift
new file mode 100644
index 0000000..fb3613c
--- /dev/null
+++ b/Package.swift
@@ -0,0 +1,38 @@
+// swift-tools-version: 6.4
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "NorgKeyboardToolbar",
+    platforms: [
+        .iOS(.v18),
+        .macOS(.v15),
+        .visionOS(.v2),
+    ],
+    products: [
+        // Products define the executables and libraries a package produces, making them visible to other packages.
+        .library(
+            name: "NorgKeyboardToolbar",
+            targets: ["NorgKeyboardToolbar"]
+        ),
+    ],
+    targets: [
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
+        .target(
+            name: "NorgKeyboardToolbar",
+            swiftSettings: [
+                .enableUpcomingFeature("ApproachableConcurrency"),
+            ],
+        ),
+        .testTarget(
+            name: "NorgKeyboardToolbarTests",
+            dependencies: ["NorgKeyboardToolbar"],
+            swiftSettings: [
+                .enableUpcomingFeature("ApproachableConcurrency"),
+            ],
+        ),
+    ],
+    swiftLanguageModes: [.v6]
+)
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..dc8cec4
--- /dev/null
+++ b/README.md
@@ -0,0 +1,65 @@
+# Norg Keyboard Toolbar
+
+This package provides a toolbar you can use whenever you need to edit norg
+files. The toolbar provides the following buttons:
+
+The heading button creates a new heading, or increases the heading of the
+current level. See this table for examples.
+
+| Starting State | Resulting State |
+|----------------|-----------------|
+| * ⏐            | ** ⏐            |
+| * ⏐ Hello      | ** ⏐ Hello      |
+| * Hello ⏐      | * Hello\n* ⏐    |
+| Hello ⏐        | Hello\n* ⏐      |
+
+The task button creates a task on a new line, unless it's at the beginning of
+a heading or list, in which case it adds the task to the list.
+
+| Starting State | Resulting State |
+|----------------|-----------------|
+| * ⏐            | * ( ) ⏐         |
+| * ⏐ Hello      | * ( ) ⏐ Hello   |
+| * Hello ⏐      | * Hello\n- ( )⏐ |
+| Hello ⏐        | Hello\n- ( ) ⏐  |
+| ~ ⏐            | ~ ( ) ⏐         |
+
+The reverse heading buttons add `---` or `===` in a new line.
+
+The code button adds a `@code` and `@end` block.
+
+## Usage
+
+Add the package to your project by including the repo URL with Xcode's package
+manager, and import it:
+
+```swift
+import SwiftUI
+import NorgKeyboardToolbar
+
+struct EditorView: View {
+    @State private var draft = ""
+    @State private var selection: TextSelection?
+
+    var body: some View {
+        TextEditor(text: $draft, selection: $selection)
+            .toolbar {
+                NorgKeyboardToolbar(text: $draft, selection: $selection)
+            }
+    }
+}
+```
+
+`NorgKeyboardToolbar` then places a toolbar above the keyboard (or the bottom
+of the screen if a hardware keyboard is connected.) with the buttons described
+above.
+
+## Development
+
+A `Justfile` is provided to run common tasks:
+
+- `just build`, build the code.
+- `just test`, run tests.
+- `just coverage`, view coverage information.
+- `just format`, format and apply lint fixes.
+- `just lint`, lint the code.
diff --git a/Sources/NorgKeyboardToolbar/EditorSnippet+Presentation.swift b/Sources/NorgKeyboardToolbar/EditorSnippet+Presentation.swift
new file mode 100644
index 0000000..f21916a
--- /dev/null
+++ b/Sources/NorgKeyboardToolbar/EditorSnippet+Presentation.swift
@@ -0,0 +1,27 @@
+import Foundation
+
+/// Extensions for how the toolbar buttons are presented.
+extension EditorSnippet {
+
+  /// Accessibility label for the toolbar button.
+  public var label: String {
+    switch self {
+    case .heading: return "Heading"
+    case .task: return "Task"
+    case .weakReverse: return "Close one level"
+    case .strongReverse: return "Close all levels"
+    case .code: return "Code block"
+    }
+  }
+
+  /// SF Symbol shown on the toolbar button.
+  public var systemImage: String {
+    switch self {
+    case .heading: return "asterisk"
+    case .task: return "checkmark.circle"
+    case .weakReverse: return "chevron.left"
+    case .strongReverse: return "chevron.left.2"
+    case .code: return "chevron.left.forwardslash.chevron.right"
+    }
+  }
+}
diff --git a/Sources/NorgKeyboardToolbar/EditorSnippet.swift b/Sources/NorgKeyboardToolbar/EditorSnippet.swift
new file mode 100644
index 0000000..b87d2b1
--- /dev/null
+++ b/Sources/NorgKeyboardToolbar/EditorSnippet.swift
@@ -0,0 +1,90 @@
+import Foundation
+
+/// The available editor snippets to show in the toolbar.
+enum EditorSnippet: String, CaseIterable, Identifiable, Sendable {
+  case heading
+  case task
+  case weakReverse
+  case strongReverse
+  case code
+
+  public var id: String { rawValue }
+
+  /// The text inserted, with the cursor offset (in characters).
+  public var template: (text: String, cursor: Int) {
+    switch self {
+    case .heading: return ("* ", 2)
+    case .task: return ("- ( ) ", 6)
+    case .weakReverse: return ("---", 3)
+    case .strongReverse: return ("===", 3)
+    case .code: return ("@code\n\t\n@end", 7)
+    }
+  }
+
+  /// Applies the snippet, returning the updated text and new cursor offset.
+  public func apply(to text: String, cursor: Int) -> (text: String, cursor: Int) {
+    let characters = Array(text)
+    let position = min(max(cursor, 0), characters.count)
+
+    switch self {
+    case .heading where isInBareMarker(characters, at: position, markers: ["*"]):
+      return promoteHeading(characters, at: position)
+    case .task where isInBareMarker(characters, at: position, markers: ["*", "~"]):
+      return addTask(toMarker: characters, at: position)
+    default:
+      return insertOnNewLine(in: characters, cursor: position)
+    }
+  }
+
+  // MARK: - Marker-aware behaviours
+
+  /// 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>)
+    -> Bool {
+    let lineStart = LineScanner.lineStart(in: characters, at: position)
+    let prefix = characters[lineStart..<position]
+    return prefix.contains(where: markers.contains)
+      && prefix.allSatisfy { markers.contains($0) || $0 == " " }
+  }
+
+  /// 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
+  ) {
+    let lineStart = LineScanner.lineStart(in: characters, at: position)
+
+    var insertAt = lineStart
+    while insertAt < characters.count, characters[insertAt] == " " { insertAt += 1 }
+    while insertAt < characters.count, characters[insertAt] == "*" { insertAt += 1 }
+
+    var result = characters
+    result.insert("*", at: insertAt)
+    return (String(result), insertAt <= position ? position + 1 : position)
+  }
+
+  /// Inserts a task marker `( ) ` at the cursor, turning a heading or
+  /// ordered-list item into a task.
+  private func addTask(toMarker characters: [Character], at position: Int) -> (
+    text: String, cursor: Int
+  ) {
+    var result = characters
+    result.insert(contentsOf: "( ) ", at: position)
+    return (String(result), position + 4)
+  }
+
+  /// Inserts the snippet's text on a new line beneath the cursor's line.
+  private func insertOnNewLine(in characters: [Character], cursor position: Int) -> (
+    text: String, cursor: Int
+  ) {
+    // An empty document takes the snippet as-is, with no leading newline.
+    guard !characters.isEmpty else { return template }
+
+    let lineEnd = LineScanner.lineEnd(in: characters, at: position)
+
+    let prefix = String(characters[0..<lineEnd])
+    let suffix = String(characters[lineEnd...])
+    let newText = prefix + "\n" + template.text + suffix
+    return (newText, lineEnd + 1 + template.cursor)
+  }
+}
diff --git a/Sources/NorgKeyboardToolbar/LineScanner.swift b/Sources/NorgKeyboardToolbar/LineScanner.swift
new file mode 100644
index 0000000..53d443d
--- /dev/null
+++ b/Sources/NorgKeyboardToolbar/LineScanner.swift
@@ -0,0 +1,21 @@
+import Foundation
+
+/// Tools to find the start and end of a line.
+enum LineScanner {
+
+  /// Given a current position in a character array, find the index of the
+  /// start of the line.
+  static func lineStart(in characters: [Character], at position: Int) -> Int {
+    var start = position
+    while start > 0, characters[start - 1] != "\n" { start -= 1 }
+    return start
+  }
+
+  /// Given a current position in a character array, find the index right
+  /// after the next newline or end of buffer.
+  static func lineEnd(in characters: [Character], at position: Int) -> Int {
+    var end = position
+    while end < characters.count, characters[end] != "\n" { end += 1 }
+    return end
+  }
+}
diff --git a/Sources/NorgKeyboardToolbar/NorgKeyboardToolbar.swift b/Sources/NorgKeyboardToolbar/NorgKeyboardToolbar.swift
new file mode 100644
index 0000000..fdd114b
--- /dev/null
+++ b/Sources/NorgKeyboardToolbar/NorgKeyboardToolbar.swift
@@ -0,0 +1,59 @@
+#if canImport(SwiftUI)
+  import SwiftUI
+
+  /// `ToolbarContent` that provides one button per `EditorSnippet`.
+  ///
+  /// It takes the same `text` and `selection` bindings used with `TextEditor`.
+  ///
+  /// ```swift
+  /// TextEditor(text: $draft, selection: $selection)
+  ///     .toolbar { NorgKeyboardToolbar(text: $draft, selection: $selection) }
+  /// ```
+  ///
+  /// Tapping a button applies the corresponding snippet to `text` and moves the
+  /// insertion point to the snippet's cursor offset.
+  @available(iOS 18.0, macOS 15.0, visionOS 2.0, *)
+  public struct NorgKeyboardToolbar: ToolbarContent {
+    @Binding private var text: String
+    @Binding private var selection: TextSelection?
+
+    public init(text: Binding<String>, selection: Binding<TextSelection?>) {
+      self._text = text
+      self._selection = selection
+    }
+
+    public var body: some ToolbarContent {
+      ToolbarItemGroup(placement: .keyboard) {
+        ForEach(EditorSnippet.allCases) { snippet in
+          Button(snippet.label, systemImage: snippet.systemImage) { insert(snippet) }
+            .labelStyle(.iconOnly)
+        }
+      }
+    }
+
+    private func insert(_ snippet: EditorSnippet) {
+      let result = snippet.apply(to: text, cursor: cursorOffset())
+      text = result.text
+
+      // Apply the new cursor after the text change commits, otherwise the
+      // editor resets the insertion point to the end.
+      DispatchQueue.main.async {
+        let clamped = min(max(result.cursor, 0), text.count)
+        selection = TextSelection(insertionPoint: text.index(text.startIndex, offsetBy: clamped))
+      }
+    }
+
+    private func cursorOffset() -> Int {
+      guard let selection else { return text.count }
+      switch selection.indices {
+      case .selection(let range):
+        return text.distance(from: text.startIndex, to: range.lowerBound)
+      case .multiSelection(let rangeSet):
+        guard let first = rangeSet.ranges.first else { return text.count }
+        return text.distance(from: text.startIndex, to: first.lowerBound)
+      @unknown default:
+        return text.count
+      }
+    }
+  }
+#endif
diff --git a/Tests/NorgKeyboardToolbarTests/EditorSnippet+PresentationTests.swift b/Tests/NorgKeyboardToolbarTests/EditorSnippet+PresentationTests.swift
new file mode 100644
index 0000000..e31df1b
--- /dev/null
+++ b/Tests/NorgKeyboardToolbarTests/EditorSnippet+PresentationTests.swift
@@ -0,0 +1,13 @@
+import Testing
+
+@testable import NorgKeyboardToolbar
+
+struct EditorSnippetPresentationTests {
+
+  @Test func everySnippetHasALabelAndSymbol() {
+    for snippet in EditorSnippet.allCases {
+      #expect(!snippet.label.isEmpty)
+      #expect(!snippet.systemImage.isEmpty)
+    }
+  }
+}
diff --git a/Tests/NorgKeyboardToolbarTests/EditorSnippetTests.swift b/Tests/NorgKeyboardToolbarTests/EditorSnippetTests.swift
new file mode 100644
index 0000000..00a9332
--- /dev/null
+++ b/Tests/NorgKeyboardToolbarTests/EditorSnippetTests.swift
@@ -0,0 +1,150 @@
+import Testing
+
+@testable import NorgKeyboardToolbar
+
+struct EditorSnippetTests {
+
+  @Test func idMatchesRawValueAndIsUnique() {
+    for snippet in EditorSnippet.allCases {
+      #expect(snippet.id == snippet.rawValue)
+    }
+    #expect(Set(EditorSnippet.allCases.map(\.id)).count == EditorSnippet.allCases.count)
+  }
+
+  @Test func insertsIntoEmptyDocumentWithoutLeadingNewline() {
+    let result = EditorSnippet.heading.apply(to: "", cursor: 0)
+    #expect(result.text == "* ")
+    #expect(result.cursor == 2)
+  }
+
+  @Test func insertsOnNewLineBeneathCurrentLine() {
+    let result = EditorSnippet.task.apply(to: "first line", cursor: 3)
+    #expect(result.text == "first line\n- ( ) ")
+    // Cursor sits at the end of the inserted task marker, ready to type.
+    #expect(result.cursor == result.text.count)
+  }
+
+  @Test func insertsBetweenLinesNotSplittingThem() {
+    let result = EditorSnippet.task.apply(to: "a\nb", cursor: 0)
+    #expect(result.text == "a\n- ( ) \nb")
+  }
+
+  @Test func delimiterHasNoTrailingSpace() {
+    let weak = EditorSnippet.weakReverse.apply(to: "x", cursor: 1)
+    #expect(weak.text == "x\n---")
+    let strong = EditorSnippet.strongReverse.apply(to: "x", cursor: 1)
+    #expect(strong.text == "x\n===")
+  }
+
+  @Test func codeBlockPlacesCursorIndentedBetweenMarkers() {
+    let result = EditorSnippet.code.apply(to: "note", cursor: 4)
+    #expect(result.text == "note\n@code\n\t\n@end")
+    // Cursor lands right after the tab on the middle line.
+    let index = result.text.index(result.text.startIndex, offsetBy: result.cursor)
+    #expect(result.text[result.text.startIndex..<index].hasSuffix("@code\n\t"))
+    #expect(String(result.text[index...]) == "\n@end")
+  }
+
+  @Test func clampsCursorBeyondBounds() {
+    let result = EditorSnippet.heading.apply(to: "abc", cursor: 999)
+    #expect(result.text == "abc\n* ")
+  }
+
+  // MARK: - Heading promotion (the `*` button's special behaviour)
+
+  @Test func headingPromotesEmptyMarker() {
+    // "* |" -> "** |"
+    let result = EditorSnippet.heading.apply(to: "* ", cursor: 2)
+    #expect(result.text == "** ")
+    #expect(result.cursor == 3)
+  }
+
+  @Test func headingPromotesWithTrailingContent() {
+    // "* |Hello" -> "** |Hello"
+    let result = EditorSnippet.heading.apply(to: "* Hello", cursor: 2)
+    #expect(result.text == "** Hello")
+    #expect(result.cursor == 3)
+  }
+
+  @Test func headingPromotesBareStars() {
+    // "***|" -> "****|"
+    let result = EditorSnippet.heading.apply(to: "***", cursor: 3)
+    #expect(result.text == "****")
+    #expect(result.cursor == 4)
+  }
+
+  @Test func headingInsertsNewLineWhenCursorAfterContent() {
+    // "* Hello|" -> new heading line
+    let result = EditorSnippet.heading.apply(to: "* Hello", cursor: 7)
+    #expect(result.text == "* Hello\n* ")
+  }
+
+  @Test func headingInsertsNewLineWhenMarkerNotAtLineStart() {
+    // "Hello *|" -> new heading line, not promotion
+    let result = EditorSnippet.heading.apply(to: "Hello *", cursor: 7)
+    #expect(result.text == "Hello *\n* ")
+  }
+
+  @Test func headingPromotesIndentedMarker() {
+    let result = EditorSnippet.heading.apply(to: "  ** ", cursor: 5)
+    #expect(result.text == "  *** ")
+  }
+
+  @Test func headingPromotionKeepsCursorWhenInsertingAfterIt() {
+    // "*|*" -> "**|*" : the new star lands after the cursor, so the offset
+    // is unchanged.
+    let result = EditorSnippet.heading.apply(to: "**", cursor: 1)
+    #expect(result.text == "***")
+    #expect(result.cursor == 1)
+  }
+
+  // MARK: - Task button heading awareness
+
+  @Test func taskAddsMarkerToBareHeading() {
+    // "* |" -> "* ( ) |"
+    let result = EditorSnippet.task.apply(to: "* ", cursor: 2)
+    #expect(result.text == "* ( ) ")
+    #expect(result.cursor == 6)
+  }
+
+  @Test func taskAddsMarkerToHeadingPreservingLevelAndContent() {
+    // "** |Hello" -> "** ( ) |Hello"
+    let result = EditorSnippet.task.apply(to: "** Hello", cursor: 3)
+    #expect(result.text == "** ( ) Hello")
+    #expect(result.cursor == 7)
+  }
+
+  @Test func taskInsertsNewLineWhenHeadingHasContent() {
+    // "** Hello|" -> "** Hello\n- ( ) "
+    let result = EditorSnippet.task.apply(to: "** Hello", cursor: 8)
+    #expect(result.text == "** Hello\n- ( ) ")
+    #expect(result.cursor == result.text.count)
+  }
+
+  @Test func taskAddsMarkerToBareOrderedListItem() {
+    // "~ |" -> "~ ( ) |"
+    let result = EditorSnippet.task.apply(to: "~ ", cursor: 2)
+    #expect(result.text == "~ ( ) ")
+    #expect(result.cursor == 6)
+  }
+
+  @Test func taskAddsMarkerToOrderedListPreservingLevelAndContent() {
+    // "~~ |Hello" -> "~~ ( ) |Hello"
+    let result = EditorSnippet.task.apply(to: "~~ Hello", cursor: 3)
+    #expect(result.text == "~~ ( ) Hello")
+    #expect(result.cursor == 7)
+  }
+
+  @Test func taskInsertsNewLineWhenOrderedListHasContent() {
+    // "~ Hello|" -> "~ Hello\n- ( ) "
+    let result = EditorSnippet.task.apply(to: "~ Hello", cursor: 7)
+    #expect(result.text == "~ Hello\n- ( ) ")
+    #expect(result.cursor == result.text.count)
+  }
+
+  @Test func headingIgnoresOrderedListMarker() {
+    // The `*` button only promotes `*` headings, not `~` lists.
+    let result = EditorSnippet.heading.apply(to: "~ ", cursor: 2)
+    #expect(result.text == "~ \n* ")
+  }
+}
diff --git a/Tests/NorgKeyboardToolbarTests/LineScannerTests.swift b/Tests/NorgKeyboardToolbarTests/LineScannerTests.swift
new file mode 100644
index 0000000..17b9cb0
--- /dev/null
+++ b/Tests/NorgKeyboardToolbarTests/LineScannerTests.swift
@@ -0,0 +1,45 @@
+import Testing
+
+@testable import NorgKeyboardToolbar
+
+struct LineScannerTests {
+
+  @Test func lineStartFindsBeginningOfCurrentLine() {
+    let chars = Array("first\nsecond")
+    // Cursor inside "second" (offset 9 -> the 'o').
+    #expect(LineScanner.lineStart(in: chars, at: 9) == 6)
+  }
+
+  @Test func lineStartAtBufferStartIsZero() {
+    let chars = Array("hello")
+    #expect(LineScanner.lineStart(in: chars, at: 3) == 0)
+  }
+
+  @Test func lineStartJustAfterNewlineIsTheNewLine() {
+    let chars = Array("a\nb")
+    // Offset 2 sits at 'b', whose line starts right after the newline.
+    #expect(LineScanner.lineStart(in: chars, at: 2) == 2)
+  }
+
+  @Test func lineEndFindsNextNewline() {
+    let chars = Array("first\nsecond")
+    #expect(LineScanner.lineEnd(in: chars, at: 2) == 5)
+  }
+
+  @Test func lineEndAtLastLineIsBufferCount() {
+    let chars = Array("first\nsecond")
+    #expect(LineScanner.lineEnd(in: chars, at: 8) == chars.count)
+  }
+
+  @Test func lineEndOnNewlineStaysPut() {
+    let chars = Array("a\nb")
+    // Offset 1 is the newline itself.
+    #expect(LineScanner.lineEnd(in: chars, at: 1) == 1)
+  }
+
+  @Test func handlesEmptyBuffer() {
+    let chars: [Character] = []
+    #expect(LineScanner.lineStart(in: chars, at: 0) == 0)
+    #expect(LineScanner.lineEnd(in: chars, at: 0) == 0)
+  }
+}