|
// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Collections.Generic;
using System.Diagnostics;
namespace System;
/// <summary>Provides format strings and related information for use with the current terminal.</summary>
internal sealed class TerminalFormatStrings
{
/// <summary>The format string to use to change the foreground color.</summary>
public readonly string? Foreground;
/// <summary>The format string to use to change the background color.</summary>
public readonly string? Background;
/// <summary>The format string to use to reset the foreground and background colors.</summary>
public readonly string? Reset;
/// <summary>The maximum number of colors supported by the terminal.</summary>
public readonly int MaxColors;
/// <summary>The number of columns in a format.</summary>
public readonly int Columns;
/// <summary>The number of lines in a format.</summary>
public readonly int Lines;
/// <summary>The format string to use to make cursor visible.</summary>
public readonly string? CursorVisible;
/// <summary>The format string to use to make cursor invisible</summary>
public readonly string? CursorInvisible;
/// <summary>The format string to use to set the window title.</summary>
public readonly string? Title;
/// <summary>The format string to use for an audible bell.</summary>
public readonly string? Bell;
/// <summary>The format string to use to clear the terminal.</summary>
/// <remarks>If supported, this includes the format string for first clearing the terminal scrollback buffer.</remarks>
public readonly string? Clear;
/// <summary>The format string to use to set the position of the cursor.</summary>
public readonly string? CursorAddress;
/// <summary>The format string to use to move the cursor to the left.</summary>
public readonly string? CursorLeft;
/// <summary>The format string to use to clear to the end of line.</summary>
public readonly string? ClrEol;
/// <summary>The ANSI-compatible string for the Cursor Position report request.</summary>
/// <remarks>
/// This should really be in user string 7 in the terminfo file, but some terminfo databases
/// are missing it. As this is defined to be supported by any ANSI-compatible terminal,
/// we assume it's available; doing so means CursorTop/Left will work even if the terminfo database
/// doesn't contain it (as appears to be the case with e.g. screen and tmux on Ubuntu), at the risk
/// of outputting the sequence on some terminal that's not compatible.
/// </remarks>
public const string CursorPositionReport = "\e[6n";
/// <summary>
/// The dictionary of keystring to ConsoleKeyInfo.
/// Only some members of the ConsoleKeyInfo are used; in particular, the actual char is ignored.
/// </summary>
public readonly Dictionary<ReadOnlyMemory<char>, ConsoleKeyInfo> KeyFormatToConsoleKey =
new Dictionary<ReadOnlyMemory<char>, ConsoleKeyInfo>(new ReadOnlyMemoryContentComparer());
/// <summary> Max key length </summary>
public readonly int MaxKeyFormatLength;
/// <summary> Min key length </summary>
public readonly int MinKeyFormatLength;
/// <summary>The ANSI string used to enter "application" / "keypad transmit" mode.</summary>
public readonly string? KeypadXmit;
/// <summary>Indicates that it was created out of rxvt TERM</summary>
public readonly bool IsRxvtTerm;
public TerminalFormatStrings(TermInfo.Database? db)
{
if (db == null)
return;
KeypadXmit = db.GetString(TermInfo.WellKnownStrings.KeypadXmit);
Foreground = db.GetString(TermInfo.WellKnownStrings.SetAnsiForeground);
Background = db.GetString(TermInfo.WellKnownStrings.SetAnsiBackground);
Reset = db.GetString(TermInfo.WellKnownStrings.OrigPairs) ?? db.GetString(TermInfo.WellKnownStrings.OrigColors);
Bell = db.GetString(TermInfo.WellKnownStrings.Bell);
Clear = db.GetString(TermInfo.WellKnownStrings.Clear);
if (db.GetExtendedString("E3") is string clearScrollbackBuffer)
{
Clear += clearScrollbackBuffer; // the E3 command must come after the Clear command
}
Columns = db.GetNumber(TermInfo.WellKnownNumbers.Columns);
Lines = db.GetNumber(TermInfo.WellKnownNumbers.Lines);
CursorVisible = db.GetString(TermInfo.WellKnownStrings.CursorVisible);
CursorInvisible = db.GetString(TermInfo.WellKnownStrings.CursorInvisible);
CursorAddress = db.GetString(TermInfo.WellKnownStrings.CursorAddress);
CursorLeft = db.GetString(TermInfo.WellKnownStrings.CursorLeft);
ClrEol = db.GetString(TermInfo.WellKnownStrings.ClrEol);
IsRxvtTerm = !string.IsNullOrEmpty(db.Term) && db.Term.Contains("rxvt", StringComparison.OrdinalIgnoreCase);
Title = GetTitle(db);
Debug.WriteLineIf(db.GetString(TermInfo.WellKnownStrings.CursorPositionReport) != CursorPositionReport,
"Getting the cursor position will only work if the terminal supports the CPR sequence," +
"but the terminfo database does not contain an entry for it.");
int maxColors = db.GetNumber(TermInfo.WellKnownNumbers.MaxColors);
MaxColors = // normalize to either the full range of all ANSI colors, just the dark ones, or none
maxColors >= 16 ? 16 :
maxColors >= 8 ? 8 :
0;
AddKey(db, TermInfo.WellKnownStrings.KeyF1, ConsoleKey.F1);
AddKey(db, TermInfo.WellKnownStrings.KeyF2, ConsoleKey.F2);
AddKey(db, TermInfo.WellKnownStrings.KeyF3, ConsoleKey.F3);
AddKey(db, TermInfo.WellKnownStrings.KeyF4, ConsoleKey.F4);
AddKey(db, TermInfo.WellKnownStrings.KeyF5, ConsoleKey.F5);
AddKey(db, TermInfo.WellKnownStrings.KeyF6, ConsoleKey.F6);
AddKey(db, TermInfo.WellKnownStrings.KeyF7, ConsoleKey.F7);
AddKey(db, TermInfo.WellKnownStrings.KeyF8, ConsoleKey.F8);
AddKey(db, TermInfo.WellKnownStrings.KeyF9, ConsoleKey.F9);
AddKey(db, TermInfo.WellKnownStrings.KeyF10, ConsoleKey.F10);
AddKey(db, TermInfo.WellKnownStrings.KeyF11, ConsoleKey.F11);
AddKey(db, TermInfo.WellKnownStrings.KeyF12, ConsoleKey.F12);
AddKey(db, TermInfo.WellKnownStrings.KeyF13, ConsoleKey.F13);
AddKey(db, TermInfo.WellKnownStrings.KeyF14, ConsoleKey.F14);
AddKey(db, TermInfo.WellKnownStrings.KeyF15, ConsoleKey.F15);
AddKey(db, TermInfo.WellKnownStrings.KeyF16, ConsoleKey.F16);
AddKey(db, TermInfo.WellKnownStrings.KeyF17, ConsoleKey.F17);
AddKey(db, TermInfo.WellKnownStrings.KeyF18, ConsoleKey.F18);
AddKey(db, TermInfo.WellKnownStrings.KeyF19, ConsoleKey.F19);
AddKey(db, TermInfo.WellKnownStrings.KeyF20, ConsoleKey.F20);
AddKey(db, TermInfo.WellKnownStrings.KeyF21, ConsoleKey.F21);
AddKey(db, TermInfo.WellKnownStrings.KeyF22, ConsoleKey.F22);
AddKey(db, TermInfo.WellKnownStrings.KeyF23, ConsoleKey.F23);
AddKey(db, TermInfo.WellKnownStrings.KeyF24, ConsoleKey.F24);
AddKey(db, TermInfo.WellKnownStrings.KeyBackspace, ConsoleKey.Backspace);
AddKey(db, TermInfo.WellKnownStrings.KeyBackTab, ConsoleKey.Tab, shift: true, alt: false, control: false);
AddKey(db, TermInfo.WellKnownStrings.KeyBegin, ConsoleKey.Home);
AddKey(db, TermInfo.WellKnownStrings.KeyClear, ConsoleKey.Clear);
AddKey(db, TermInfo.WellKnownStrings.KeyDelete, ConsoleKey.Delete);
AddKey(db, TermInfo.WellKnownStrings.KeyDown, ConsoleKey.DownArrow);
AddKey(db, TermInfo.WellKnownStrings.KeyEnd, ConsoleKey.End);
AddKey(db, TermInfo.WellKnownStrings.KeyEnter, ConsoleKey.Enter);
AddKey(db, TermInfo.WellKnownStrings.KeyHelp, ConsoleKey.Help);
AddKey(db, TermInfo.WellKnownStrings.KeyHome, ConsoleKey.Home);
AddKey(db, TermInfo.WellKnownStrings.KeyInsert, ConsoleKey.Insert);
AddKey(db, TermInfo.WellKnownStrings.KeyLeft, ConsoleKey.LeftArrow);
AddKey(db, TermInfo.WellKnownStrings.KeyPageDown, ConsoleKey.PageDown);
AddKey(db, TermInfo.WellKnownStrings.KeyPageUp, ConsoleKey.PageUp);
AddKey(db, TermInfo.WellKnownStrings.KeyPrint, ConsoleKey.Print);
AddKey(db, TermInfo.WellKnownStrings.KeyRight, ConsoleKey.RightArrow);
AddKey(db, TermInfo.WellKnownStrings.KeyScrollForward, ConsoleKey.PageDown, shift: true, alt: false, control: false);
AddKey(db, TermInfo.WellKnownStrings.KeyScrollReverse, ConsoleKey.PageUp, shift: true, alt: false, control: false);
AddKey(db, TermInfo.WellKnownStrings.KeySBegin, ConsoleKey.Home, shift: true, alt: false, control: false);
AddKey(db, TermInfo.WellKnownStrings.KeySDelete, ConsoleKey.Delete, shift: true, alt: false, control: false);
AddKey(db, TermInfo.WellKnownStrings.KeySHome, ConsoleKey.Home, shift: true, alt: false, control: false);
AddKey(db, TermInfo.WellKnownStrings.KeySelect, ConsoleKey.Select);
AddKey(db, TermInfo.WellKnownStrings.KeySLeft, ConsoleKey.LeftArrow, shift: true, alt: false, control: false);
AddKey(db, TermInfo.WellKnownStrings.KeySPrint, ConsoleKey.Print, shift: true, alt: false, control: false);
AddKey(db, TermInfo.WellKnownStrings.KeySRight, ConsoleKey.RightArrow, shift: true, alt: false, control: false);
AddKey(db, TermInfo.WellKnownStrings.KeyUp, ConsoleKey.UpArrow);
AddPrefixKey(db, "kLFT", ConsoleKey.LeftArrow);
AddPrefixKey(db, "kRIT", ConsoleKey.RightArrow);
AddPrefixKey(db, "kUP", ConsoleKey.UpArrow);
AddPrefixKey(db, "kDN", ConsoleKey.DownArrow);
AddPrefixKey(db, "kDC", ConsoleKey.Delete);
AddPrefixKey(db, "kEND", ConsoleKey.End);
AddPrefixKey(db, "kHOM", ConsoleKey.Home);
AddPrefixKey(db, "kNXT", ConsoleKey.PageDown);
AddPrefixKey(db, "kPRV", ConsoleKey.PageUp);
if (KeyFormatToConsoleKey.Count > 0)
{
MaxKeyFormatLength = int.MinValue;
MinKeyFormatLength = int.MaxValue;
foreach (KeyValuePair<ReadOnlyMemory<char>, ConsoleKeyInfo> entry in KeyFormatToConsoleKey)
{
if (entry.Key.Length > MaxKeyFormatLength)
{
MaxKeyFormatLength = entry.Key.Length;
}
if (entry.Key.Length < MinKeyFormatLength)
{
MinKeyFormatLength = entry.Key.Length;
}
}
}
}
private static string GetTitle(TermInfo.Database db)
{
// Try to get the format string from tsl/fsl and use it if they're available
string? tsl = db.GetString(TermInfo.WellKnownStrings.ToStatusLine);
string? fsl = db.GetString(TermInfo.WellKnownStrings.FromStatusLine);
if (tsl != null && fsl != null)
{
return tsl + "%p1%s" + fsl;
}
string term = db.Term;
if (term == null)
{
return string.Empty;
}
if (term.StartsWith("xterm", StringComparison.Ordinal)) // normalize all xterms to enable easier matching
{
term = "xterm";
}
else if (term.StartsWith("screen", StringComparison.Ordinal)) // normalize all tmux configs
{
term = "screen";
}
switch (term)
{
case "aixterm":
case "dtterm":
case "linux":
case "rxvt":
case "xterm":
return "\e]0;%p1%s\x07";
case "cygwin":
return "\e];%p1%s\x07";
case "konsole":
return "\e]30;%p1%s\x07";
case "screen":
return "\ek%p1%s\e\\";
default:
return string.Empty;
}
}
private void AddKey(TermInfo.Database db, TermInfo.WellKnownStrings keyId, ConsoleKey key)
{
AddKey(db, keyId, key, shift: false, alt: false, control: false);
}
private void AddKey(TermInfo.Database db, TermInfo.WellKnownStrings keyId, ConsoleKey key, bool shift, bool alt, bool control)
{
ReadOnlyMemory<char> keyFormat = db.GetString(keyId).AsMemory();
if (!keyFormat.IsEmpty)
KeyFormatToConsoleKey[keyFormat] = new ConsoleKeyInfo(key == ConsoleKey.Enter ? '\r' : '\0', key, shift, alt, control);
}
private void AddPrefixKey(TermInfo.Database db, string extendedNamePrefix, ConsoleKey key)
{
if (db.HasExtendedStrings) // avoid string concatenation in case when there are no Extended Strings (typical scenario)
{
AddKey(db, extendedNamePrefix + "3", key, shift: false, alt: true, control: false);
AddKey(db, extendedNamePrefix + "4", key, shift: true, alt: true, control: false);
AddKey(db, extendedNamePrefix + "5", key, shift: false, alt: false, control: true);
AddKey(db, extendedNamePrefix + "6", key, shift: true, alt: false, control: true);
AddKey(db, extendedNamePrefix + "7", key, shift: false, alt: false, control: true);
}
}
private void AddKey(TermInfo.Database db, string extendedName, ConsoleKey key, bool shift, bool alt, bool control)
{
ReadOnlyMemory<char> keyFormat = db.GetExtendedString(extendedName).AsMemory();
if (!keyFormat.IsEmpty)
KeyFormatToConsoleKey[keyFormat] = new ConsoleKeyInfo('\0', key, shift, alt, control);
}
private sealed class ReadOnlyMemoryContentComparer : IEqualityComparer<ReadOnlyMemory<char>>
{
public bool Equals(ReadOnlyMemory<char> x, ReadOnlyMemory<char> y) =>
x.Span.SequenceEqual(y.Span);
public int GetHashCode(ReadOnlyMemory<char> obj) =>
string.GetHashCode(obj.Span);
}
}
|