58 lines
3 KiB
C#
58 lines
3 KiB
C#
namespace tgcli.Tests;
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public class PagedMessageInput {
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[Theory]
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[InlineData(0)]
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[InlineData(76)]
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[InlineData(77)]
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[InlineData(147)]
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[InlineData(148)]
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[InlineData(218)]
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[InlineData(219)]
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[InlineData(289)]
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public void TestGetPagedMessageInput(int offset) {
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const string testMessage =
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"this is a test string please ignore 1, this is a test string please ignore 2, this is a test string please ignore 3, this is a test string please ignore 4, this is a test string please ignore 5, this is a test string please ignore 6, this is a test string please ignore 7, this is a test str.";
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const int testBufferWidth = 80;
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Assert.Equal(ReferenceMethods.GetPagedMessageInputLine(testMessage, offset, testBufferWidth), Util.GetPagedMessageInputLine(testMessage, offset, testBufferWidth));
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}
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private static class ReferenceMethods {
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internal static (string messageBuffer, int relCursorPos) GetPagedMessageInputLine(string message, int absCursorPos, int bufferWidth) {
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const int wrapOffsetPre = 2; // number of "untouchable" characters moving the cursor onto will cause a wrap on the right screen edge
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const int wrapOffsetPost = 5; // number of "untouchable" characters moving the cursor onto will cause a wrap on the left screen edge
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const int wrapOffsetPreI = wrapOffsetPre + 1; // offset + 1 (character on the edge), for easier calculations
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const int wrapOffsetPostI = wrapOffsetPost + 1; // offset + 1 (character on the edge), for easier calculations
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if (absCursorPos > message.Length)
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throw new ArgumentOutOfRangeException(nameof(absCursorPos), "Cursor position exceeds message length");
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if (message.Length < bufferWidth)
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return (message, absCursorPos);
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if (absCursorPos < bufferWidth - wrapOffsetPre - 1)
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return (Util.TruncateString(message, bufferWidth, $"{Util.Ansi.Inverse}>{Util.Ansi.InverseOff}"), absCursorPos);
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// now we can be sure the message needs at least one wrap
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// first wrap
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// get rid of the content shown on the zeroth wrap, which is buf width minus wraparoundPreW (respects > character on screen edge)
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var finalMessage = message[(bufferWidth - wrapOffsetPreI - wrapOffsetPost)..];
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var finalCursorPos = absCursorPos - bufferWidth + wrapOffsetPreI + wrapOffsetPostI;
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// successive wraps
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// repeat above steps (but counting the new < character) until the string fits into the buffer
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// it fits into the buffer when cursorPos >= bufferwidth minus wraparound (this time respecting > character absent on first wrap)
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while (finalCursorPos >= bufferWidth - wrapOffsetPreI) {
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finalMessage = finalMessage[(bufferWidth - wrapOffsetPreI - wrapOffsetPostI)..];
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finalCursorPos = finalCursorPos - bufferWidth + wrapOffsetPreI + wrapOffsetPostI;
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}
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finalMessage = Util.TruncateString(finalMessage, bufferWidth - 1, $"{Util.Ansi.Inverse}>{Util.Ansi.InverseOff}");
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return ($"{Util.Ansi.Inverse}<{Util.Ansi.InverseOff}" + finalMessage, finalCursorPos);
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}
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}
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}
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