284 lines
10 KiB
C#
284 lines
10 KiB
C#
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///////////////////////////////////////////////////////////////////////////////
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//
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// Microsoft Research Singularity
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//
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//
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// File: More
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//
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// Note: A text pager contributed by Valerie See (vsee)
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//
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using System;
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using System.Collections;
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using System.Diagnostics;
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using System.IO;
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using Pipe = Microsoft.Singularity.Io.Tty2006;
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using FileSystem.Utils;
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using Microsoft.Contracts;
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using Microsoft.SingSharp.Reflection;
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using Microsoft.Singularity.Applications;
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using Microsoft.Singularity.Io;
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using Microsoft.Singularity.Directory;
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using Microsoft.Singularity.Configuration;
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using Microsoft.Singularity.Channels;
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[assembly: Transform(typeof(ApplicationResourceTransform))]
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namespace Microsoft.Singularity.Applications
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{
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[ConsoleCategory(HelpMessage="Display a screen full of text", DefaultAction=true)]
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internal class Parameters {
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[InputEndpoint("data")]
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public readonly TRef<UnicodePipeContract.Exp:READY> Stdin;
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[OutputEndpoint("data")]
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public readonly TRef<UnicodePipeContract.Imp:READY> Stdout;
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[Endpoint]
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public readonly TRef<DirectoryServiceContract.Imp:Start> nsRef;
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[Endpoint]
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public readonly TRef<KeyboardDeviceContract.Imp:Start> keyboardRef;
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[StringArrayParameter( "files", HelpMessage="Files to be listed.")]
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internal string[] fileSet;
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reflective internal Parameters();
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internal int AppMain() {
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return More.AppMain(this);
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}
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}
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class More
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{
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internal static int pageCounter;
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internal static Terminal! terminal;
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internal static long fileSize;
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internal static long bytesRead;
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internal static int GetKey(KeyboardDeviceContract.Imp! keyboard)
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{
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keyboard.SendGetKey();
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switch receive {
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case keyboard.AckKey(ikey):
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return (int) ikey;
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break;
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case keyboard.NakKey():
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return -1;
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break;
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case keyboard.ChannelClosed():
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Tracing.Log(Tracing.Debug, "Keyboard channel closed");
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return -1;
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}
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return -1;
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}
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[ Conditional("DEBUG_MORE") ]
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static void DebugPrint(string format, params object [] args)
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{
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DebugStub.Print(String.Format(format, args));
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}
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[ Conditional("DEBUG_MORE") ]
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static void DebugWriteLine(string format, params object [] args)
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{
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DebugPrint(format, args);
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DebugStub.Print("\n");
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}
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[ Conditional("DEBUG_MORE") ]
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static void DebugReadLine()
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{
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Console.ReadLine();
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}
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internal static int AppMain(Parameters! config) {
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// constants
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//int szLineCount = 0;
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int displayfile = 0;
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int consoleWidth = 0;
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int consoleHeight = 0;
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pageCounter = 0;
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terminal = new Terminal();
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DirectoryServiceContract.Imp dsRoot = (config.nsRef).Acquire();
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if (dsRoot == null) {
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throw new Exception("Unable to acquire handle to the Directory Service root");
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}
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dsRoot.RecvSuccess();
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KeyboardDeviceContract.Imp keyboard = (config.keyboardRef).Acquire();
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if (dsRoot == null) {
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throw new Exception("Unable to acquire handle to the keyboard");
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}
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keyboard.RecvSuccess();
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// FIXFIX need to dynamically get window size
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consoleHeight = 47; // allow for "activity" line on top of Singularity console....
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consoleWidth = 79;
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assume config.fileSet != null;
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string szSrcLine;
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bool ok;
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if (config.fileSet.Length <= 0 ) {
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//stdin
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while ( (szSrcLine = Console.ReadLine()) != null ) {
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ok = PageText(szSrcLine, keyboard, consoleHeight, consoleWidth, true);
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if (!ok) break;
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}
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delete keyboard;
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delete dsRoot;
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return 0;
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}
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for (displayfile = 0; displayfile < config.fileSet.Length; displayfile++) {
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string filename = config.fileSet[displayfile];
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if (filename == null) continue;
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// check that file exists
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ErrorCode error;
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NodeType nodeType;
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ok = FileUtils.GetAttributes(filename, dsRoot, out fileSize, out nodeType, out error);
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if (ok) {
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if ( nodeType == NodeType.IoMemory || nodeType == NodeType.File ) {
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// Open file RO for now
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FileStream fsInput = new FileStream(dsRoot, filename, FileMode.Open, FileAccess.Read);
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StreamReader srInput = new StreamReader(fsInput);
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while ((szSrcLine = srInput.ReadLine()) != null)
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{
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ok = PageText(szSrcLine, keyboard, consoleHeight, consoleWidth, false);
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if (!ok) break;
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}
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srInput.Close();
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fsInput.Close();
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// Display the file by pages
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// TODO: change PageText to return between pages so can recheck for
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// screen dimension changes (?)
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if (displayfile <= config.fileSet.Length - 2) // offset by 2 due to index offset plus increment hasn't happened yet
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{
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Console.WriteLine("");
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Console.Write("-- <ENTER> for next file --");
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int key;
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do {
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key = Console.Read();
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if (key == -1) {
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delete keyboard;
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delete dsRoot;
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return 0;
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}
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} while ((char)key != '\n');
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}
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}
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else if (nodeType == NodeType.Directory) {
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// check that it's not a directory
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Console.WriteLine("\n{0} - is a directory.", filename);
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}
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} // ok
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else {
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// not a directory, but file doesn't exist, print error message
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Console.WriteLine("\n{0} - file not found.", filename);
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}
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}
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delete keyboard;
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delete dsRoot;
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return 0;
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}
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//////////////////////////////////////////////////////////////
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// Write out prompt and wait for input
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// After acquiring the input remove the prompt from the console
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//////////////////////////////////////////////////////////////
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static int GetInput( KeyboardDeviceContract.Imp! keyboard,
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int PAGELENGTH, bool processingStdin)
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{
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double temp = 0;
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int counter = 0;
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int key;
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if (processingStdin) {
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Console.Write("-- <more> -- ");
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key = GetKey(keyboard);
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if ((char)key == '\n' ) Console.Write("\n");
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} else {
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temp = (double) (bytesRead * 100) / (double)fileSize;
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Console.Write("-- <more> ({0}%) -- ", (int)temp );
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key = Console.Read();
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}
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// get rid of the -- <ENTER> line
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if ((char)key == '\n' ){
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terminal.GenerateAndSendEscapeSequence(Pipe.EscapeCodes.UP);
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}
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Console.Write("\r");
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terminal.GenerateAndSendEscapeSequence(Pipe.EscapeCodes.ERASE_FROM_CURSOR);
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if (key == -1) return -1;
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switch (Char.ToLower((char)key )) {
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case 'q':
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return -1;
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default:
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if ((char)key == '\n') counter = PAGELENGTH ; // advance by 1
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break;
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}
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return counter;
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}
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// PageText - display text a page at a time
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static bool PageText(string! workString, KeyboardDeviceContract.Imp! keyboard,
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int PAGELENGTH, int PAGEWIDTH, bool processingStdin)
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{
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string[] lines;
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int remainder = 0;
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int linesinline = 0;
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// Split the line into the requisite number of lines
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// needed based on page width
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if ( workString.Length <= PAGEWIDTH ) {
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lines = new string[1];
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lines[0] = workString;
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}
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else {
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int fullLines = workString.Length / PAGEWIDTH;
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remainder = workString.Length % PAGEWIDTH;
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linesinline = fullLines;
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if (remainder != 0) linesinline++;
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lines = new string[linesinline];
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int pos = 0;
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for (int i=0; i < fullLines; i++) {
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lines[i] = workString.Substring(pos,PAGEWIDTH);
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pos += PAGEWIDTH;
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}
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if (remainder != 0) {
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lines[fullLines] = workString.Substring(pos);
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}
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}
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// write the lines out pausing where necessary
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for (int i=0; i < lines.Length; i++) {
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string s = lines[i];
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assert s!= null;
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Console.WriteLine(s);
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pageCounter++;
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bytesRead += s.Length;
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if (pageCounter >= PAGELENGTH) {
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pageCounter = GetInput(keyboard, PAGELENGTH, processingStdin);
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if (pageCounter == -1) return false;
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}
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}
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lines = null;
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return true;
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} // end of PageText
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}
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}
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