mirror of
https://github.com/PowerShell/PSReadLine
synced 2026-06-08 12:12:13 +00:00
851 lines
33 KiB
C#
851 lines
33 KiB
C#
/********************************************************************++
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Copyright (c) Microsoft Corporation. All rights reserved.
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--********************************************************************/
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using System;
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using System.Collections.Generic;
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using System.Text;
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using System.Threading.Tasks;
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using System.Management.Automation.Subsystem.Prediction;
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using Microsoft.PowerShell.Internal;
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namespace Microsoft.PowerShell
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{
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public partial class PSConsoleReadLine
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{
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/// <summary>
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/// The base type of the prediction view.
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/// </summary>
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private abstract class PredictionViewBase
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{
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protected readonly PSConsoleReadLine _singleton;
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protected Task<List<PredictionResult>> _predictionTask;
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protected string _inputText;
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private HashSet<string> _cacheHistorySet;
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private List<SuggestionEntry> _cacheHistoryList;
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protected PredictionViewBase(PSConsoleReadLine singleton)
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{
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_singleton = singleton;
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}
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/// <summary>
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/// Gets whether to use plugin as a source.
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/// </summary>
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internal bool UsePlugin => (_singleton._options.PredictionSource & PredictionSource.Plugin) != 0;
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/// <summary>
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/// Gets whether to use history as a source.
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/// </summary>
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internal bool UseHistory => (_singleton._options.PredictionSource & PredictionSource.History) != 0;
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/// <summary>
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/// Gets whether an update to the view is pending.
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/// </summary>
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internal virtual bool HasPendingUpdate => false;
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/// <summary>
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/// Gets whether there is currently any suggestion results.
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/// </summary>
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internal abstract bool HasActiveSuggestion { get; }
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/// <summary>
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/// Get suggestion results.
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/// </summary>
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internal abstract void GetSuggestion(string userInput);
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/// <summary>
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/// Render the suggestion view.
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/// </summary>
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internal abstract void RenderSuggestion(List<StringBuilder> consoleBufferLines, ref int currentLogicalLine);
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/// <summary>
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/// Get called when a suggestion result is accepted.
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/// </summary>
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internal abstract void OnSuggestionAccepted();
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/// <summary>
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/// Clear the current suggestion view.
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/// </summary>
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/// <param name="cursorAtEol">Indicate if the cursor is currently at the end of input.</param>
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internal abstract void Clear(bool cursorAtEol);
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/// <summary>
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/// Reset the view instance.
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/// </summary>
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internal virtual void Reset()
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{
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_inputText = null;
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_predictionTask = null;
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}
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/// <summary>
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/// Currently we only select single-line history that is prefixed with the user input,
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/// but it can be improved to not strictly use the user input as a prefix, but a hint
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/// to extract a partial pipeline or statement from a single-line or multiple-line
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/// history entry.
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/// </summary>
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protected string GetOneHistorySuggestion(string text)
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{
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var history = _singleton._history;
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var comparison = _singleton._options.HistoryStringComparison;
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for (int index = history.Count - 1; index >= 0; index--)
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{
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var line = history[index].CommandLine.TrimEnd();
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if (line.Length > text.Length)
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{
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bool isMultiLine = line.IndexOf('\n') != -1;
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if (!isMultiLine && line.StartsWith(text, comparison))
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{
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return line;
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}
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}
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}
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return null;
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}
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/// <summary>
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/// Get multiple suggestion results from histories, as long as a history is a single-line
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/// command that contains the user input.
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/// We favor history commands that are prefixed with the user input over those that contain
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/// the user input in the middle or at the end.
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/// </summary>
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/// <param name="input">User input.</param>
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/// <param name="count">Maximum number of results to return.</param>
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protected List<SuggestionEntry> GetHistorySuggestions(string input, int count)
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{
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List<SuggestionEntry> results = null;
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int remainingCount = count;
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var history = _singleton._history;
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var comparison = _singleton._options.HistoryStringComparison;
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var comparer = _singleton._options.HistoryStringComparer;
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_cacheHistorySet ??= new HashSet<string>(comparer);
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_cacheHistoryList ??= new List<SuggestionEntry>();
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for (int historyIndex = history.Count - 1; historyIndex >= 0; historyIndex--)
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{
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var line = history[historyIndex].CommandLine.TrimEnd();
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// Skip the history command lines that are smaller in length than the user input,
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// or contain multiple logical lines.
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if (line.Length <= input.Length || _cacheHistorySet.Contains(line) || line.IndexOf('\n') != -1)
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{
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continue;
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}
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int matchIndex = line.IndexOf(input, comparison);
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if (matchIndex == -1)
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{
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continue;
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}
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if (results == null)
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{
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results = new List<SuggestionEntry>(capacity: count);
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}
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_cacheHistorySet.Add(line);
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if (matchIndex == 0)
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{
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results.Add(new SuggestionEntry(line, matchIndex));
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if (--remainingCount == 0)
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{
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break;
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}
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}
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else if (_cacheHistoryList.Count < remainingCount)
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{
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_cacheHistoryList.Add(new SuggestionEntry(line, matchIndex));
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}
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}
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if (remainingCount > 0 && _cacheHistoryList.Count > 0)
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{
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for (int i = 0; i < remainingCount && i < _cacheHistoryList.Count; i++)
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{
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results.Add(_cacheHistoryList[i]);
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}
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}
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_cacheHistorySet.Clear();
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_cacheHistoryList.Clear();
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return results;
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}
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/// <summary>
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/// Calls to the prediction API for suggestion results.
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/// </summary>
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protected void PredictInput()
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{
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_predictionTask = _singleton._mockableMethods.PredictInputAsync(_singleton._ast, _singleton._tokens);
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}
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/// <summary>
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/// Gets the results from the prediction task.
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/// </summary>
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protected List<PredictionResult> GetPredictionResults()
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{
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try
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{
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return _predictionTask?.Result;
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}
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catch
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{
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return null;
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}
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finally
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{
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_predictionTask = null;
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}
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}
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}
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/// <summary>
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/// This type represents the list view for prediction.
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/// </summary>
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private class PredictionListView : PredictionViewBase
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{
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internal const int ListMaxCount = 10;
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internal const int ListMaxWidth = 100;
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internal const int SourceMaxWidth = 15;
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internal const int MinWindowWidth = 54;
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internal const int MinWindowHeight = 15;
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private List<SuggestionEntry> _listItems;
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private int _listItemWidth;
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private int _listItemHeight;
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private int _selectedIndex;
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private bool _updatePending;
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// Caches re-used when aggregating the suggestion results from predictors and history.
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private List<int> _cacheList1;
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private List<int> _cacheList2;
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/// <summary>
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/// Gets whether the current window size meets the minimum requirement for the List view to work.
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/// </summary>
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private bool WindowSizeMeetsMinRequirement
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{
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get
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{
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var console = _singleton._console;
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return console.WindowWidth >= MinWindowWidth && console.WindowHeight >= MinWindowHeight;
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}
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}
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/// <summary>
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/// The index of the currently selected item.
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/// </summary>
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internal int SelectedItemIndex => _selectedIndex;
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/// <summary>
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/// The text of the currently selected item.
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/// </summary>
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internal string SelectedItemText
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{
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get
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{
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if (_listItems == null)
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return null;
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if (_selectedIndex >= 0)
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return _listItems[_selectedIndex].SuggestionText;
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if (_selectedIndex == -1)
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return _inputText;
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throw new InvalidOperationException("Unexpected '_selectedIndex' value: " + _selectedIndex);
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}
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}
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internal PredictionListView(PSConsoleReadLine singleton)
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: base(singleton)
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{
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Reset();
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}
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internal override bool HasPendingUpdate => _updatePending;
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internal override bool HasActiveSuggestion => _listItems != null;
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internal override void GetSuggestion(string userInput)
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{
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bool inputUnchanged = string.Equals(_inputText, userInput, _singleton._options.HistoryStringComparison);
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if (!inputUnchanged && _selectedIndex > -1)
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{
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// User input was changed while a specific list item was selected. This is a strong indicator that
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// the selected list item was accepted, because the user was editing based on the selected item.
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//
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// But be noted that it's not guaranteed to be 100% accurate, because it's still possible that the
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// user selected all the buffer and then was replacing it with something totally different.
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OnSuggestionAccepted();
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}
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if (!WindowSizeMeetsMinRequirement)
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{
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// If the window size is too small for the list view to work, we just disable the list view.
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Reset();
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return;
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}
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_inputText = userInput;
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_selectedIndex = -1;
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_listItemWidth = Math.Min(_singleton._console.BufferWidth, ListMaxWidth);
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if (inputUnchanged)
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{
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// This could happen when the user types 'ctrl+z' (undo) while looping through the suggestion list.
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// The 'undo' operation would revert the line back to the original user input, and in that cases, we
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// could reuse the existing suggestion results.
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return;
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}
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_listItems?.Clear();
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try
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{
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if (UsePlugin)
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{
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PredictInput();
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}
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if (UseHistory)
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{
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_listItems = GetHistorySuggestions(userInput, ListMaxCount);
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}
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}
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catch
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{
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Reset();
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}
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}
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/// <summary>
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/// Aggregate the suggestion results from both the prediction API and the history.
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/// </summary>
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/// <remarks>
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/// If the prediction source contains both the history and plugin, then we allocate 3
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/// slots at most for history suggestions. The remaining slots are evenly distributed
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/// to each predictor plugin.
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/// </remarks>
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private void AggregateSuggestions()
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{
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var results = GetPredictionResults();
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if (results?.Count > 0)
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{
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try
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{
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_listItems ??= new List<SuggestionEntry>();
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_cacheList1 ??= new List<int>(); // This list holds the total number of suggestions from each of the predictors.
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_cacheList2 ??= new List<int>(); // This list holds the final number of suggestions that will be rendered for each of the predictors.
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int pCount = 0;
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int hCount = Math.Min(3, _listItems.Count);
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int remRows = ListMaxCount - hCount;
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// Calculate the number of plugins that we need to handle,
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// and the number of results each of them returned.
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foreach (var item in results)
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{
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if (item.Suggestions?.Count > 0)
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{
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pCount++;
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_cacheList1.Add(item.Suggestions.Count);
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if (pCount == remRows)
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{
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break;
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}
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}
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}
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// Calculate the average slots to be allocated to each plugin.
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int ave = remRows / pCount;
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// Assign the results of each plugin to the average slots.
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// Note that it's possible a plugin may return less results than the average slots,
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// and in that case, the unused slots will be come remaining slots that are to be
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// distributed again.
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for (int i = 0; i < pCount; i++)
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{
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int val = _cacheList1[i];
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if (val > ave)
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{
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val = ave;
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}
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_cacheList1[i] -= val;
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_cacheList2.Add(val);
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remRows -= val;
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}
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// Distribute the remaining slots to each of the plugins one by one.
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bool more = true;
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while (remRows > 0 && more)
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{
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more = false;
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for (int i = 0; i < pCount; i++)
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{
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if (_cacheList1[i] == 0)
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{
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continue;
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}
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_cacheList1[i]--;
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_cacheList2[i]++;
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remRows--;
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if (remRows == 0)
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{
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break;
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}
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more = _cacheList1[i] > 0;
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}
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}
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if (hCount > 0)
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{
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_listItems.RemoveRange(hCount, _listItems.Count - hCount);
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}
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int index = -1;
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var comparison = _singleton._options.HistoryStringComparison;
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// Finalize the list items by assign the results to the allocated slots for each plugin.
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foreach (var item in results)
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{
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if (item.Suggestions?.Count > 0)
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{
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index++;
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if (index == pCount)
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{
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break;
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}
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int num = _cacheList2[index];
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for (int i = 0; i < num; i++)
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{
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string sugText = item.Suggestions[i].SuggestionText ?? string.Empty;
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int matchIndex = sugText.IndexOf(_inputText, comparison);
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_listItems.Add(new SuggestionEntry(item.Name, item.Id, item.Session, sugText, matchIndex));
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}
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if (item.Session.HasValue)
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{
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// Send feedback only if the mini-session id is specified.
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// When it's not specified, we consider the predictor doesn't accept feedback.
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_singleton._mockableMethods.OnSuggestionDisplayed(item.Id, item.Session.Value, num);
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}
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}
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}
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}
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finally
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{
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_cacheList1.Clear();
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_cacheList2.Clear();
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}
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}
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if (_listItems?.Count > 0)
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{
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_listItemHeight = Math.Min(_listItems.Count, ListMaxCount);
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}
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else
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{
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Reset();
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}
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}
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internal override void RenderSuggestion(List<StringBuilder> consoleBufferLines, ref int currentLogicalLine)
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{
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if (_updatePending)
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{
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_updatePending = false;
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}
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else
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{
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AggregateSuggestions();
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}
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if (_listItems == null)
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{
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return;
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}
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for (int i = 0; i < _listItemHeight; i++)
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{
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currentLogicalLine += 1;
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if (currentLogicalLine == consoleBufferLines.Count)
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{
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consoleBufferLines.Add(new StringBuilder(COMMON_WIDEST_CONSOLE_WIDTH));
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}
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bool itemSelected = i == _selectedIndex;
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StringBuilder currentLineBuffer = consoleBufferLines[currentLogicalLine];
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string selectionColor = itemSelected ? _singleton._options._listPredictionSelectedColor : null;
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currentLineBuffer.Append(
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_listItems[i].GetListItemText(
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_listItemWidth,
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_inputText,
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selectionColor));
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if (itemSelected)
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{
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currentLineBuffer.Append(VTColorUtils.AnsiReset);
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}
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}
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}
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internal override void OnSuggestionAccepted()
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{
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if (!UsePlugin)
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{
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return;
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}
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if (_listItems != null && _selectedIndex != -1)
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{
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var item = _listItems[_selectedIndex];
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if (item.PredictorSession.HasValue)
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{
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// Send feedback only if the mini-session id is specified.
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// When it's not specified, we consider the predictor doesn't accept feedback.
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_singleton._mockableMethods.OnSuggestionAccepted(item.PredictorId, item.PredictorSession.Value, item.SuggestionText);
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}
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}
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}
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internal override void Clear(bool cursorAtEol)
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{
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if (_listItems == null) { return; }
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int top = cursorAtEol
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? _singleton._console.CursorTop
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: _singleton.ConvertOffsetToPoint(_inputText.Length).Y;
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_singleton.WriteBlankLines(top + 1, _listItemHeight);
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Reset();
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}
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internal override void Reset()
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{
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base.Reset();
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_listItems = null;
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_listItemWidth = _listItemHeight = _selectedIndex = -1;
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_updatePending = false;
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}
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/// <summary>
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/// Update the index of the selected item based on <paramref name="move"/>.
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/// </summary>
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/// <param name="move"></param>
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internal void UpdateListSelection(int move)
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{
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int virtualItemIndex = _selectedIndex + 1;
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int virtualItemCount = _listItemHeight + 1;
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_updatePending = true;
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virtualItemIndex += move;
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if (virtualItemIndex >= 0 && virtualItemIndex < virtualItemCount)
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{
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_selectedIndex = virtualItemIndex - 1;
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}
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else if (virtualItemIndex >= virtualItemCount)
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{
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_selectedIndex = virtualItemIndex % virtualItemCount - 1;
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}
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else
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{
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_selectedIndex = virtualItemIndex % virtualItemCount + virtualItemCount - 1;
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}
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}
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}
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/// <summary>
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/// This type represents the inline view for prediction.
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/// </summary>
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private class PredictionInlineView : PredictionViewBase
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{
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private Guid _predictorId;
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private uint? _predictorSession;
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private string _suggestionText;
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private string _lastInputText;
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private int _renderedLength;
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private bool _alreadyAccepted;
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internal string SuggestionText => _suggestionText;
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|
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internal PredictionInlineView(PSConsoleReadLine singleton)
|
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: base(singleton)
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{
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}
|
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internal override bool HasActiveSuggestion => _suggestionText != null;
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internal override void GetSuggestion(string userInput)
|
|
{
|
|
try
|
|
{
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|
_inputText = userInput;
|
|
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|
if (_suggestionText == null || _suggestionText.Length <= userInput.Length ||
|
|
_lastInputText.Length > userInput.Length ||
|
|
!_suggestionText.StartsWith(userInput, _singleton._options.HistoryStringComparison))
|
|
{
|
|
_alreadyAccepted = false;
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|
_suggestionText = null;
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|
_lastInputText = userInput;
|
|
|
|
if (UsePlugin)
|
|
{
|
|
PredictInput();
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|
}
|
|
|
|
if (UseHistory)
|
|
{
|
|
_suggestionText = GetOneHistorySuggestion(userInput);
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|
_predictorId = Guid.Empty;
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|
_predictorSession = null;
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|
}
|
|
}
|
|
}
|
|
catch
|
|
{
|
|
Reset();
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|
}
|
|
}
|
|
|
|
private void AggregateSuggestions()
|
|
{
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|
var results = GetPredictionResults();
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|
if (results?.Count > 0)
|
|
{
|
|
foreach (var item in results)
|
|
{
|
|
if (item.Suggestions == null || item.Suggestions.Count == 0)
|
|
{
|
|
continue;
|
|
}
|
|
|
|
int index = 0;
|
|
foreach (var sug in item.Suggestions)
|
|
{
|
|
if (sug.SuggestionText != null &&
|
|
sug.SuggestionText.StartsWith(_inputText, _singleton._options.HistoryStringComparison))
|
|
{
|
|
_predictorId = item.Id;
|
|
_predictorSession = item.Session;
|
|
_suggestionText = sug.SuggestionText;
|
|
|
|
if (_predictorSession.HasValue)
|
|
{
|
|
// Send feedback only if the mini-session id is specified.
|
|
// When it's not specified, we consider the predictor doesn't accept feedback.
|
|
_singleton._mockableMethods.OnSuggestionDisplayed(_predictorId, _predictorSession.Value, -index);
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
index++;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
internal override void RenderSuggestion(List<StringBuilder> consoleBufferLines, ref int currentLogicalLine)
|
|
{
|
|
AggregateSuggestions();
|
|
|
|
if (_suggestionText == null)
|
|
{
|
|
Reset();
|
|
return;
|
|
}
|
|
|
|
int inputLength = _inputText.Length;
|
|
int totalLength = _suggestionText.Length;
|
|
|
|
// Get the maximum buffer cells that could be available to the current command line.
|
|
int maxBufferCells = _singleton._console.BufferHeight * _singleton._console.BufferWidth - _singleton._initialX;
|
|
bool skipRendering = false;
|
|
|
|
// Assuming the suggestion text contains wide characters only (1 character takes up 2 buffer cells),
|
|
// if it still can fit in the console buffer, then we are all good; otherwise, it is possible that
|
|
// it could not fit, and thus more calculation is needed to check if that's really the case.
|
|
if (totalLength * 2 > maxBufferCells)
|
|
{
|
|
int length = SubstringLengthByCells(_suggestionText, maxBufferCells);
|
|
if (length <= inputLength)
|
|
{
|
|
// Even the user input cannot fit in the console buffer without having part of it scrolled up-off the buffer.
|
|
// We don't attempt to render the suggestion text in this case.
|
|
skipRendering = true;
|
|
}
|
|
else if (length < totalLength)
|
|
{
|
|
// The whole suggestion text cannot fit in the console buffer without having part of it scrolled up off the buffer.
|
|
// We truncate the end part and append ellipsis.
|
|
|
|
// We need to truncate 4 buffer cells ealier (just to be safe), so we have enough room to add the ellipsis.
|
|
int lenFromEnd = SubstringLengthByCellsFromEnd(_suggestionText, length - 1, countOfCells: 4);
|
|
totalLength = length - lenFromEnd;
|
|
if (totalLength <= inputLength)
|
|
{
|
|
// No suggestion left after truncation, so no need to render.
|
|
skipRendering = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (skipRendering)
|
|
{
|
|
_renderedLength = 0;
|
|
return;
|
|
}
|
|
|
|
_renderedLength = totalLength;
|
|
StringBuilder currentLineBuffer = consoleBufferLines[currentLogicalLine];
|
|
|
|
currentLineBuffer
|
|
.Append(_singleton._options._inlinePredictionColor)
|
|
.Append(_suggestionText, inputLength, _renderedLength - inputLength);
|
|
|
|
if (_renderedLength < _suggestionText.Length)
|
|
{
|
|
currentLineBuffer.Append("...");
|
|
}
|
|
|
|
currentLineBuffer.Append(VTColorUtils.AnsiReset);
|
|
}
|
|
|
|
internal override void OnSuggestionAccepted()
|
|
{
|
|
if (!UsePlugin)
|
|
{
|
|
return;
|
|
}
|
|
|
|
if (!_alreadyAccepted && _suggestionText != null && _predictorSession.HasValue)
|
|
{
|
|
_alreadyAccepted = true;
|
|
|
|
// Send feedback only if the mini-session id is specified.
|
|
// When it's not specified, we consider the predictor doesn't accept feedback.
|
|
_singleton._mockableMethods.OnSuggestionAccepted(_predictorId, _predictorSession.Value, _suggestionText);
|
|
}
|
|
}
|
|
|
|
internal override void Clear(bool cursorAtEol)
|
|
{
|
|
if (_suggestionText == null)
|
|
{
|
|
return;
|
|
}
|
|
|
|
if (_renderedLength > 0)
|
|
{
|
|
// Clear the suggestion only if we actually rendered it.
|
|
int left, top;
|
|
int inputLen = _inputText.Length;
|
|
IConsole console = _singleton._console;
|
|
|
|
if (cursorAtEol)
|
|
{
|
|
left = console.CursorLeft;
|
|
top = console.CursorTop;
|
|
console.BlankRestOfLine();
|
|
}
|
|
else
|
|
{
|
|
Point bufferEndPoint = _singleton.ConvertOffsetToPoint(inputLen);
|
|
left = bufferEndPoint.X;
|
|
top = bufferEndPoint.Y;
|
|
_singleton.WriteBlankRestOfLine(left, top);
|
|
}
|
|
|
|
int bufferWidth = console.BufferWidth;
|
|
int columns = LengthInBufferCells(_suggestionText, inputLen, _renderedLength);
|
|
|
|
int remainingLenInCells = bufferWidth - left;
|
|
columns -= remainingLenInCells;
|
|
if (columns > 0)
|
|
{
|
|
int extra = columns % bufferWidth > 0 ? 1 : 0;
|
|
int count = columns / bufferWidth + extra;
|
|
_singleton.WriteBlankLines(top + 1, count);
|
|
}
|
|
}
|
|
|
|
Reset();
|
|
}
|
|
|
|
internal override void Reset()
|
|
{
|
|
base.Reset();
|
|
_suggestionText = _lastInputText = null;
|
|
_predictorId = Guid.Empty;
|
|
_predictorSession = null;
|
|
_alreadyAccepted = false;
|
|
_renderedLength = 0;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Perform forward lookup to find the ending index of the next word in the suggestion text.
|
|
/// </summary>
|
|
internal int FindForwardSuggestionWordPoint(int currentIndex, string wordDelimiters)
|
|
{
|
|
System.Diagnostics.Debug.Assert(
|
|
_suggestionText != null && _suggestionText.Length > _singleton._buffer.Length,
|
|
"Caller needs to make sure the suggestion text exist.");
|
|
|
|
if (currentIndex >= _suggestionText.Length)
|
|
{
|
|
return _suggestionText.Length;
|
|
}
|
|
|
|
int i = currentIndex;
|
|
if (!_singleton.InWord(_suggestionText[i], wordDelimiters))
|
|
{
|
|
// Scan to end of current non-word region
|
|
while (++i < _suggestionText.Length)
|
|
{
|
|
if (_singleton.InWord(_suggestionText[i], wordDelimiters))
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (i < _suggestionText.Length)
|
|
{
|
|
while (++i < _suggestionText.Length)
|
|
{
|
|
if (!_singleton.InWord(_suggestionText[i], wordDelimiters))
|
|
{
|
|
if (_suggestionText[i] == ' ')
|
|
{
|
|
// If the end of this suggestion word is a space, then we consider the word
|
|
// is complete and include the space in the accepted suggestion word.
|
|
i++;
|
|
}
|
|
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
return i;
|
|
}
|
|
}
|
|
}
|
|
}
|