PowerArgs.Cli.RichCommandLineContext.CompleteCurrentToken C# (CSharp) Method

        public void CompleteCurrentToken(Token currentToken, ConsoleString completion)
        {
            var quoteStatus = GetQuoteStatus(this.Buffer, this.BufferPosition - 1);
            bool readyToEnd = quoteStatus != QuoteStatus.ClosedQuote;
            var endTarget = quoteStatus == QuoteStatus.NoQuotes ? ' ' : '"';

            int currentTokenStartIndex;
            for (currentTokenStartIndex = this.BufferPosition - 1; currentTokenStartIndex >= 0; currentTokenStartIndex--)
            {
                if (this.Buffer[currentTokenStartIndex].Value == endTarget && readyToEnd)
                {
                    if (endTarget == ' ')
                    {
                        currentTokenStartIndex++;
                    }

                    break;
                }
                else if (this.Buffer[currentTokenStartIndex].Value == endTarget)
                {
                    readyToEnd = true;
                }
            }

            if (currentTokenStartIndex == -1) currentTokenStartIndex = 0;

            var insertThreshold = currentTokenStartIndex + currentToken.Value.Length;

            List<ConsoleCharacter> newBuffer = new List<ConsoleCharacter>(this.Buffer);
            for (int completionIndex = 0; completionIndex < completion.Length; completionIndex++)
            {
                if (completionIndex + currentTokenStartIndex == newBuffer.Count)
                {
                    newBuffer.Add(completion[completionIndex]);
                }
                else if (completionIndex + currentTokenStartIndex < insertThreshold)
                {
                    newBuffer[completionIndex + currentTokenStartIndex] = completion[completionIndex];
                }
                else
                {
                    newBuffer.Insert(completionIndex + currentTokenStartIndex, completion[completionIndex]);
                }
            }

            while (newBuffer.Count > currentTokenStartIndex + completion.Length)
            {
                newBuffer.RemoveAt(currentTokenStartIndex + completion.Length);
            }

            ReplaceConsole(new ConsoleString(newBuffer));
        }

        /// <summary>
        /// Implementation of tab completion that leverages tab completion sources that are registered with the target definition.
        /// </summary>
        /// <param name="cliContext">cintext used internally</param>
        /// <returns>true if a tab completion was successfully made, false otherwise</returns>
        public bool TryTabComplete(RichCommandLineContext cliContext)
        {
            var powerArgsContext = ConvertContext(this.Definition, cliContext);

            bool   oldHookWon = false;
            string completion = null;

            foreach (var completionSource in oldHooks)
            {
                if (completionSource is ITabCompletionSourceWithContext)
                {
                    if (((ITabCompletionSourceWithContext)completionSource).TryComplete(powerArgsContext.Shift, powerArgsContext.PreviousToken, powerArgsContext.CompletionCandidate, out completion))
                    {
                        oldHookWon = true;
                        break;
                    }
                }
                else
                {
                    if (completionSource.TryComplete(powerArgsContext.Shift, powerArgsContext.CompletionCandidate, out completion))
                    {
                        oldHookWon = true;
                        break;
                    }
                }
            }

            if (oldHookWon == false)
            {
                foreach (var completionSource in newHooks)
                {
                    if (completionSource.TryComplete(powerArgsContext, out completion))
                    {
                        break;
                    }
                }
            }

            if (completion != null)
            {
                cliContext.CompleteCurrentToken(cliContext.CurrentToken, new ConsoleString(completion));
                return(true);
            }
            else
            {
                return(false);
            }
        }