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/* |
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* LSCP Shell |
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* |
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* Copyright (c) 2014 Christian Schoenebeck |
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* |
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* This program is part of LinuxSampler and released under the same terms. |
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*/ |
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|
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <iostream> |
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#include <sstream> |
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#include <string.h> |
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|
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#include "LSCPClient.h" |
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#include "KeyboardReader.h" |
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#include "TerminalCtrl.h" |
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#include "CFmt.h" |
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#include "CCursor.h" |
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#include "TerminalPrinter.h" |
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|
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#include "../common/global.h" |
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#include "../common/global_private.h" |
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#include "../common/Condition.h" |
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|
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#define LSCP_DEFAULT_HOST "localhost" |
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#define LSCP_DEFAULT_PORT 8888 |
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|
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using namespace std; |
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using namespace LinuxSampler; |
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|
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static LSCPClient* g_client = NULL; |
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static KeyboardReader* g_keyboardReader = NULL; |
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static Condition g_todo; |
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static String g_goodPortion; |
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static String g_badPortion; |
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static String g_suggestedPortion; |
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static int g_linesActive = 0; |
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static const String g_prompt = "lscp=# "; |
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static std::vector<String> g_commandHistory; |
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static int g_commandHistoryIndex = -1; |
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static String g_doc; |
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|
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static void printUsage() { |
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cout << "lscp - The LinuxSampler Control Protocol (LSCP) Shell." << endl; |
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cout << endl; |
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cout << "Usage: lscp [-h HOSTNAME] [-p PORT]" << endl; |
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cout << endl; |
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cout << " -h Host name of LSCP server (default \"" << LSCP_DEFAULT_HOST << "\")." << endl; |
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cout << endl; |
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cout << " -p TCP port number of LSCP server (default " << LSCP_DEFAULT_PORT << ")." << endl; |
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cout << endl; |
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cout << " --no-auto-correct Don't perform auto correction of obvious syntax errors." << endl; |
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cout << endl; |
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cout << " --no-doc Don't show LSCP reference documentation on screen." << endl; |
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cout << endl; |
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} |
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|
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static void printWelcome() { |
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cout << "Welcome to lscp " << VERSION << ", the LinuxSampler Control Protocol (LSCP) shell." << endl; |
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cout << endl; |
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} |
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|
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static void printPrompt() { |
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cout << g_prompt << flush; |
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} |
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|
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static int promptOffset() { |
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return g_prompt.size(); |
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} |
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|
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static void quitApp(int code = 0) { |
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std::cout << std::endl << std::flush; |
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if (g_client) delete g_client; |
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if (g_keyboardReader) delete g_keyboardReader; |
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exit(code); |
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} |
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|
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// Called by the network reading thread, whenever new data arrived from the |
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// network connection. |
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static void onLSCPClientNewInputAvailable(LSCPClient* client) { |
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g_todo.Set(true); |
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} |
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|
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// Called by the keyboard reading thread, whenever a key stroke was received. |
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static void onNewKeyboardInputAvailable(KeyboardReader* reader) { |
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g_todo.Set(true); |
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} |
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|
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// Called on network error or when server side closed the TCP connection. |
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static void onLSCPClientErrorOccured(LSCPClient* client) { |
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quitApp(); |
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} |
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|
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/// Will be called when the user hits tab key to trigger auto completion. |
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static void autoComplete() { |
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if (g_suggestedPortion.empty()) return; |
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String s; |
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// let the server delete mistaken characters first |
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for (int i = 0; i < g_badPortion.size(); ++i) s += '\b'; |
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// now add the suggested, correct characters |
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s += g_suggestedPortion; |
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g_suggestedPortion.clear(); |
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g_client->send(s); |
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} |
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|
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static void commandFromHistory(int offset) { |
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if (g_commandHistoryIndex + offset < 0 || |
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g_commandHistoryIndex + offset >= g_commandHistory.size()) return; |
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g_commandHistoryIndex += offset; |
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int len = g_goodPortion.size() + g_badPortion.size(); |
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// erase current active line |
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for (int i = 0; i < len; ++i) g_client->send('\b'); |
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// transmit new/old line to LSCP server |
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String command = g_commandHistory[g_commandHistory.size() - g_commandHistoryIndex - 1]; |
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g_client->send(command); |
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} |
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|
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/// Will be called when the user hits arrow up key, to iterate to an older command line. |
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static void previousCommand() { |
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commandFromHistory(1); |
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} |
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|
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/// Will be called when the user hits arrow down key, to iterate to a more recent command line. |
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static void nextCommand() { |
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commandFromHistory(-1); |
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} |
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|
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/// Will be called whenever the user hits ENTER, to store the line in the command history. |
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static void storeCommandInHistory(const String& sCommand) { |
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g_commandHistoryIndex = -1; // reset history index |
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// don't save the command if the previous one was the same |
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if (g_commandHistory.empty() || g_commandHistory.back() != sCommand) |
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g_commandHistory.push_back(sCommand); |
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} |
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|
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/// Splits the given string into individual lines for the given screen resolution. |
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static std::vector<String> splitForScreen(const String& s, int cols, int rows) { |
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std::vector<String> lines; |
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if (rows <= 0 || cols <= 0) return lines; |
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String line; |
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for (int i = 0; i < s.size(); ++i) { |
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char c = s[i]; |
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if (c == '\r') continue; |
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if (c == '\n') { |
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lines.push_back(line); |
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if (lines.size() >= rows) return lines; |
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line.clear(); |
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continue; |
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} |
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line += c; |
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if (line.size() >= cols) { |
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lines.push_back(line); |
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if (lines.size() >= rows) return lines; |
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line.clear(); |
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} |
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} |
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return lines; |
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} |
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|
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/** |
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* Will be called whenever the LSCP documentation reference to be shown, has |
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* been changed. This call will accordingly update the screen with the new |
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* documentation text received from LSCP server. |
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*/ |
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static void updateDoc() { |
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const int vOffset = 2; |
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|
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CCursor originalCursor = CCursor::now(); |
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CCursor cursor = originalCursor; |
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cursor.toColumn(0).down(vOffset); |
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|
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// wipe out current documentation off screen |
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cursor.clearVerticalToBottom(); |
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|
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if (g_doc.empty()) { |
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// restore original cursor position |
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cursor.up(vOffset).toColumn(originalCursor.column()); |
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return; |
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} |
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|
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// get screen size (in characters) |
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const int cols = TerminalCtrl::columns(); |
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const int rows = TerminalCtrl::rows(); |
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|
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// convert the string block into individual lines according to screen resolution |
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std::vector<String> lines = splitForScreen(g_doc, cols - 1, rows); |
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|
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// print lines onto screen |
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for (int row = 0; row < lines.size(); ++row) |
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std::cout << lines[row] << std::endl; |
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|
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// restore original cursor position |
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cursor.up(vOffset + lines.size()).toColumn(originalCursor.column()); |
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} |
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|
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/** |
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* This LSCP shell application is designed as thin client. That means the heavy |
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* LSCP grammar evaluation tasks are peformed by the LSCP server and the shell |
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* application's task are simply limited to forward individual characters typed |
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* by the user to the LSCP server and showing the result of the LSCP server's |
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* evaluation to the user on the screen. This has the big advantage that the |
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* shell works perfectly with any machine running (some minimum recent version |
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* of) LinuxSampler, no matter which precise LSCP version the server side |
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* is using. Which reduces the maintenance efforts for the shell application |
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* development tremendously. |
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* |
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* As soon as this application established a TCP connection to a LSCP server, it |
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* sends this command to the LSCP server: |
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* @code |
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* SET SHELL INTERACT 1 |
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* @endcode |
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* which will inform the LSCP server that this LSCP client is actually a LSCP |
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* shell application. The shell will then simply forward every single character |
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* typed by the user immediately to the LSCP server. The LSCP server in turn |
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* will evaluate every single character received and will return immediately a |
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* specially formatted string to the shell application like (assuming the user's |
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* current command line was "CREATE AUasdf"): |
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* @code |
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* SHU:1:CREATE AU{{GF}}asdf{{CU}}{{SB}}DIO_OUTPUT_DEVICE |
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* @endcode |
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* which informs this shell application about the result of the LSCP grammar |
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* evaluation and allows the shell to easily show that result of the evaluation |
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* to the user on the screen. In the example reply above, the prefix "SHU:" just |
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* indicates to the shell application that this response line is the result |
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* of the latest grammar evaluation, the number followed (here 1) indicates the |
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* semantic status of the current command line: |
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* |
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* - 0: Command line is complete, thus ENTER key may be hit by the user now. |
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* - 1: Current command line contains syntax error(s). |
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* - 2: Command line is incomplete, but contains no syntax errors so far. |
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* |
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* Then the actual current command line follows, with special markers: |
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* |
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* - Left of "{{GF}}" the command line is syntactically correct, right of that |
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* marker the command line is syntactically wrong. |
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* |
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* - Marker "{{CU}}" indicates the current cursor position of the command line. |
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* |
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* - Right of "{{SB}}" follows the current auto completion suggestion, so that |
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* string portion was not typed by the user yet, but is expected to be typed |
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* by him next, to retain syntax correctness. The auto completion portion is |
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* added by the LSCP server only if there is one unique way to add characters |
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* to the current command line. If there are multiple possibilities, than this |
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* portion is missing due to ambiguity. |
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* |
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* - Optionally there might also be a "{{PB}" marker on right hand side of the |
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* line. The text right to that marker reflects all possibilities at the |
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* user's current input position (which cannot be auto completed) due to |
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* ambiguity, including abstract (a.k.a. "non-terminal") symbols like: |
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* @code |
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* <digit>, <text>, <number>, etc. |
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* @endcode |
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* This portion is added by the LSCP server only if there is not a unique way |
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* to add characters to the current command line. |
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*/ |
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int main(int argc, char *argv[]) { |
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String host = LSCP_DEFAULT_HOST; |
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int port = LSCP_DEFAULT_PORT; |
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bool autoCorrect = true; |
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bool showDoc = true; |
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|
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// parse command line arguments |
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for (int i = 0; i < argc; ++i) { |
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String s = argv[i]; |
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if (s == "-h" || s == "--host") { |
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if (++i >= argc) { |
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printUsage(); |
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return -1; |
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} |
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host = argv[i]; |
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} else if (s == "-p" || s == "--port") { |
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if (++i >= argc) { |
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printUsage(); |
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return -1; |
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} |
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port = atoi(argv[i]); |
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if (port <= 0) { |
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cerr << "Error: invalid port argument \"" << argv[i] << "\"\n"; |
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return -1; |
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} |
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} else if (s == "--no-auto-correct") { |
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autoCorrect = false; |
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} else if (s == "--no-doc") { |
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showDoc = false; |
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} else if (s[0] == '-') { // invalid / unknown command line argument ... |
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printUsage(); |
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return -1; |
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} |
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} |
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|
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// try to connect to the sampler's LSCP server and start a thread for |
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// receiving incoming network data from the sampler's LSCP server |
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g_client = new LSCPClient; |
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g_client->setErrorCallback(onLSCPClientErrorOccured); |
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if (!g_client->connect(host, port)) return -1; |
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g_client->sendCommandSync( |
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(showDoc) ? "SET SHELL DOC 1" : "SET SHELL DOC 0" |
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); |
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String sResponse = g_client->sendCommandSync( |
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(autoCorrect) ? "SET SHELL AUTO_CORRECT 1" : "SET SHELL AUTO_CORRECT 0" |
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); |
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sResponse = g_client->sendCommandSync("SET SHELL INTERACT 1"); |
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if (sResponse.substr(0, 2) != "OK") { |
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cerr << "Error: sampler too old, it does not support shell instructions\n"; |
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return -1; |
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} |
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g_client->setCallback(onLSCPClientNewInputAvailable); |
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|
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printWelcome(); |
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printPrompt(); |
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|
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// start a thread for reading from the local text input keyboard |
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// (keyboard echo will be disabled as well to have a clean control on what |
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// is appearing on the screen) |
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g_keyboardReader = new KeyboardReader; |
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g_keyboardReader->setCallback(onNewKeyboardInputAvailable); |
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g_keyboardReader->startReading(); |
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|
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int iKbdEscapeCharsExpected = 0; |
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char kbdPrevEscapeChar; |
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|
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// main thread's loop |
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// |
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// This application runs 3 threads: |
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// |
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// - Keyboard thread: reads constantly on stdin for new characters (which |
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// will block this keyboard thread until new character(s) were typed by |
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// the user) and pushes the typed characters into a FIFO buffer. |
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// |
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// - Network thread: reads constantly on the TCP connection for new bytes |
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// being sent by the LSCP server (which will block this network thread |
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// until new bytes were received) and pushes the received bytes into a |
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// FIFO buffer. |
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// |
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// - Main thread: this thread runs in the loop below. The main thread sleeps |
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// (by using the "g_todo" condition variable) until either new keys on the |
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// keyboard were stroke by the user or until new bytes were received from |
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// the LSCP server. The main thread will then accordingly send the typed |
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// characters to the LSCP server and/or show the result of the LSCP |
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// server's latest evaluation to the user on the screen (by pulling those |
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// data from the other two thread's FIFO buffers). |
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while (true) { |
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// sleep until either new data from the network or from keyboard arrived |
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g_todo.WaitIf(false); |
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// immediately unset the condition variable and unlock it |
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g_todo.Set(false); |
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g_todo.Unlock(); |
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|
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// did network data arrive? |
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while (g_client->messageComplete()) { |
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String line = *g_client->popLine(); |
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//printf("line '%s'\n", line.c_str()); |
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if (line.substr(0,4) == "SHU:") { |
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int code = 0, n = 0; |
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int res = sscanf(line.c_str(), "SHU:%d:%n", &code, &n); |
| 357 |
if (res >= 1) { |
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String s = line.substr(n); |
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|
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// extract portion that is already syntactically correct |
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size_t iGood = s.find(LSCP_SHK_GOOD_FRONT); |
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String sGood = s.substr(0, iGood); |
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if (sGood.find(LSCP_SHK_CURSOR) != string::npos) |
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sGood.erase(sGood.find(LSCP_SHK_CURSOR), strlen(LSCP_SHK_CURSOR)); // erase cursor marker |
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|
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// extract portion that was written syntactically incorrect |
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String sBad = s.substr(iGood + strlen(LSCP_SHK_GOOD_FRONT)); |
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if (sBad.find(LSCP_SHK_CURSOR) != string::npos) |
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sBad.erase(sBad.find(LSCP_SHK_CURSOR), strlen(LSCP_SHK_CURSOR)); // erase cursor marker |
| 370 |
if (sBad.find(LSCP_SHK_SUGGEST_BACK) != string::npos) |
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sBad.erase(sBad.find(LSCP_SHK_SUGGEST_BACK)); // erase auto suggestion portion |
| 372 |
if (sBad.find(LSCP_SHK_POSSIBILITIES_BACK) != string::npos) |
| 373 |
sBad.erase(sBad.find(LSCP_SHK_POSSIBILITIES_BACK)); // erase possibilities portion |
| 374 |
|
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// extract portion that is suggested for auto completion |
| 376 |
String sSuggest; |
| 377 |
if (s.find(LSCP_SHK_SUGGEST_BACK) != string::npos) { |
| 378 |
sSuggest = s.substr(s.find(LSCP_SHK_SUGGEST_BACK) + strlen(LSCP_SHK_SUGGEST_BACK)); |
| 379 |
if (sSuggest.find(LSCP_SHK_CURSOR) != string::npos) |
| 380 |
sSuggest.erase(sSuggest.find(LSCP_SHK_CURSOR), strlen(LSCP_SHK_CURSOR)); // erase cursor marker |
| 381 |
if (sSuggest.find(LSCP_SHK_POSSIBILITIES_BACK) != string::npos) |
| 382 |
sSuggest.erase(sSuggest.find(LSCP_SHK_POSSIBILITIES_BACK)); // erase possibilities portion |
| 383 |
} |
| 384 |
|
| 385 |
// extract portion that provides all current possibilities |
| 386 |
// (that is all branches in the current grammar tree) |
| 387 |
String sPossibilities; |
| 388 |
if (s.find(LSCP_SHK_POSSIBILITIES_BACK) != string::npos) { |
| 389 |
sPossibilities = s.substr(s.find(LSCP_SHK_POSSIBILITIES_BACK) + strlen(LSCP_SHK_POSSIBILITIES_BACK)); |
| 390 |
} |
| 391 |
|
| 392 |
// extract current cursor position |
| 393 |
int cursorColumn = sGood.size(); |
| 394 |
String sCursor = s; |
| 395 |
if (sCursor.find(LSCP_SHK_GOOD_FRONT) != string::npos) |
| 396 |
sCursor.erase(sCursor.find(LSCP_SHK_GOOD_FRONT), strlen(LSCP_SHK_GOOD_FRONT)); // erase good/bad marker |
| 397 |
if (sCursor.find(LSCP_SHK_SUGGEST_BACK) != string::npos) |
| 398 |
sCursor.erase(sCursor.find(LSCP_SHK_SUGGEST_BACK), strlen(LSCP_SHK_SUGGEST_BACK)); // erase suggestion marker |
| 399 |
if (sCursor.find(LSCP_SHK_CURSOR) != string::npos) |
| 400 |
cursorColumn = sCursor.find(LSCP_SHK_CURSOR); |
| 401 |
|
| 402 |
// store those informations globally for the auto-completion |
| 403 |
// feature |
| 404 |
g_goodPortion = sGood; |
| 405 |
g_badPortion = sBad; |
| 406 |
g_suggestedPortion = sSuggest; |
| 407 |
|
| 408 |
//printf("line '%s' good='%s' bad='%s' suggested='%s' cursor=%d\n", line.c_str(), sGood.c_str(), sBad.c_str(), sSuggest.c_str(), cursorColumn); |
| 409 |
|
| 410 |
// clear current command line on screen |
| 411 |
// (which may have been printed over several lines) |
| 412 |
CCursor cursor = CCursor::now().toColumn(0).clearLine(); |
| 413 |
for (int i = 0; i < g_linesActive; ++i) |
| 414 |
cursor = cursor.down().clearLine(); |
| 415 |
if (g_linesActive) cursor = cursor.up(g_linesActive).toColumn(0); |
| 416 |
printPrompt(); |
| 417 |
|
| 418 |
// print out the gathered informations on the screen |
| 419 |
TerminalPrinter p; |
| 420 |
CFmt cfmt; |
| 421 |
if (code == LSCP_SHU_COMPLETE) cfmt.bold().green(); |
| 422 |
else cfmt.bold().white(); |
| 423 |
p << sGood; |
| 424 |
cfmt.reset().red(); |
| 425 |
p << sBad; |
| 426 |
cfmt.bold().yellow(); |
| 427 |
p << sSuggest; |
| 428 |
if (!sPossibilities.empty()) |
| 429 |
p << " <- " << sPossibilities; |
| 430 |
|
| 431 |
// move cursor back to the appropriate input position in |
| 432 |
// the command line (which may be several lines above) |
| 433 |
g_linesActive = p.linesAdvanced(); |
| 434 |
if (p.linesAdvanced()) cursor.up(p.linesAdvanced()); |
| 435 |
cursor.toColumn(cursorColumn + promptOffset()); |
| 436 |
} |
| 437 |
} else if (line.substr(0,4) == "SHD:") { // new LSCP doc reference section received ... |
| 438 |
int code = LSCP_SHD_NO_MATCH; |
| 439 |
int res = sscanf(line.c_str(), "SHD:%d", &code); |
| 440 |
g_doc.clear(); |
| 441 |
if (code == LSCP_SHD_MATCH) { |
| 442 |
while (true) { // multi-line response expected (terminated by dot line) ... |
| 443 |
if (line.substr(0, 1) == ".") break; |
| 444 |
if (!g_client->lineAvailable()) break; |
| 445 |
line = *g_client->popLine(); |
| 446 |
g_doc += line; |
| 447 |
} |
| 448 |
} |
| 449 |
updateDoc(); |
| 450 |
} else if (line.substr(0,2) == "OK") { // single-line response expected ... |
| 451 |
cout << endl << flush; |
| 452 |
|
| 453 |
// wipe out potential current documentation off screen |
| 454 |
CCursor cursor = CCursor::now(); |
| 455 |
cursor.clearVerticalToBottom(); |
| 456 |
|
| 457 |
CFmt cfmt; |
| 458 |
cfmt.green(); |
| 459 |
cout << line.substr(0,2) << flush; |
| 460 |
cfmt.reset(); |
| 461 |
cout << line.substr(2) << endl << flush; |
| 462 |
printPrompt(); |
| 463 |
} else if (line.substr(0,3) == "WRN") { // single-line response expected ... |
| 464 |
cout << endl << flush; |
| 465 |
|
| 466 |
// wipe out potential current documentation off screen |
| 467 |
CCursor cursor = CCursor::now(); |
| 468 |
cursor.clearVerticalToBottom(); |
| 469 |
|
| 470 |
CFmt cfmt; |
| 471 |
cfmt.yellow(); |
| 472 |
cout << line.substr(0,3) << flush; |
| 473 |
cfmt.reset(); |
| 474 |
cout << line.substr(3) << endl << flush; |
| 475 |
printPrompt(); |
| 476 |
} else if (line.substr(0,3) == "ERR") { // single-line response expected ... |
| 477 |
cout << endl << flush; |
| 478 |
|
| 479 |
// wipe out potential current documentation off screen |
| 480 |
CCursor cursor = CCursor::now(); |
| 481 |
cursor.clearVerticalToBottom(); |
| 482 |
|
| 483 |
CFmt cfmt; |
| 484 |
cfmt.bold().red(); |
| 485 |
cout << line.substr(0,3) << flush; |
| 486 |
cfmt.reset(); |
| 487 |
cout << line.substr(3) << endl << flush; |
| 488 |
printPrompt(); |
| 489 |
} else if (g_client->multiLine()) { // multi-line response expected ... |
| 490 |
cout << endl << flush; |
| 491 |
|
| 492 |
// wipe out potential current documentation off screen |
| 493 |
CCursor cursor = CCursor::now(); |
| 494 |
cursor.clearVerticalToBottom(); |
| 495 |
|
| 496 |
while (true) { |
| 497 |
cout << line << endl << flush; |
| 498 |
if (line.substr(0, 1) == ".") break; |
| 499 |
if (!g_client->lineAvailable()) break; |
| 500 |
line = *g_client->popLine(); |
| 501 |
} |
| 502 |
printPrompt(); |
| 503 |
} else { |
| 504 |
cout << endl << flush; |
| 505 |
|
| 506 |
// wipe out potential current documentation off screen |
| 507 |
CCursor cursor = CCursor::now(); |
| 508 |
cursor.clearVerticalToBottom(); |
| 509 |
|
| 510 |
cout << line << endl << flush; |
| 511 |
printPrompt(); |
| 512 |
} |
| 513 |
} |
| 514 |
|
| 515 |
// did keyboard input arrive? |
| 516 |
while (g_keyboardReader->charAvailable()) { |
| 517 |
char c = g_keyboardReader->popChar(); |
| 518 |
|
| 519 |
//std::cout << c << "(" << int(c) << ")" << std::endl << std::flush; |
| 520 |
if (iKbdEscapeCharsExpected) { // escape sequence (still) expected now ... |
| 521 |
iKbdEscapeCharsExpected--; |
| 522 |
if (iKbdEscapeCharsExpected) kbdPrevEscapeChar = c; |
| 523 |
else { // escape sequence is complete ... |
| 524 |
if (kbdPrevEscapeChar == 91 && c == 65) // up key |
| 525 |
previousCommand(); |
| 526 |
else if (kbdPrevEscapeChar == 91 && c == 66) // down key |
| 527 |
nextCommand(); |
| 528 |
else if (kbdPrevEscapeChar == 91 && c == 68) // left key |
| 529 |
g_client->send(2); // custom usage of this ASCII code |
| 530 |
else if (kbdPrevEscapeChar == 91 && c == 67) // right key |
| 531 |
g_client->send(3); // custom usage of this ASCII code |
| 532 |
} |
| 533 |
continue; // don't send this escape sequence character to LSCP server |
| 534 |
} else if (c == KBD_ESCAPE) { // escape sequence for special keys expected next ... |
| 535 |
iKbdEscapeCharsExpected = 2; |
| 536 |
continue; // don't send ESC character to LSCP server |
| 537 |
} else if (c == KBD_BACKSPACE) { |
| 538 |
c = '\b'; |
| 539 |
} else if (c == '\t') { // auto completion ... |
| 540 |
autoComplete(); |
| 541 |
continue; // don't send tab character to LSCP server |
| 542 |
} else if (c == '\n') { |
| 543 |
storeCommandInHistory(g_goodPortion + g_badPortion); |
| 544 |
} |
| 545 |
|
| 546 |
g_client->send(c); |
| 547 |
} |
| 548 |
} |
| 549 |
|
| 550 |
return 0; |
| 551 |
} |
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