xkblayout-state/wrapper.cpp

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// wrapper.cpp
// A small wrapper program around Jay Bromley's keyboard layout information class.
//
// Compilation:
// g++ -o xkblayout-state XKeyboard.cpp wrapper.cpp -lX11
//
// This program is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 of the License, or (at your option)
// any later version.
#include <cstdlib>
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#include <iostream>
#include <sstream>
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#include <string>
#include "XKeyboard.h"
using namespace std;
void print_usage(string progname)
{
cerr << endl
<< "xkblayout-state version 1b" << endl
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<< endl
<< "Usage: " << endl
<< endl
<< "To get the current layout(s):" << endl
<< " " << progname << " print format" << endl
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<< endl
<< "This causes the 'format' string to be printed on stdout with the following substitutions:" << endl
<< " %c -> current layout number" << endl
<< " %n -> current layout name" << endl
<< " %s -> current layout symbol" << endl
<< " %v -> current layout variant" << endl
<< " %e -> current layout variant (equals to %s if %v is empty)" << endl
<< " %C -> layout count" << endl
<< " %N -> layout names (one per line)" << endl
<< " %S -> layout symbols (one per line)" << endl
<< " %V -> layout variants (one per line)" << endl
<< " %E -> layout variants (one per line; layout symbol is used if variant is empty)" << endl
<< " %% -> A literal '%'" << endl
<< endl
<< "For example:" << endl
<< " " << progname << " print \"Current layout: %s(%e)\"" << endl
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<< endl
<< "To set the current layout:" << endl
<< " " << progname << " set layout_number" << endl
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<< endl
<< "Here 'layout_number' is the number of the layout to be set (starting from 0)" << endl
<< "and can be either absolute (default) or relative (if preceded with a plus or minus sign)." << endl
<< endl
<< "For example:" << endl
<< " " << progname << " set 1" << endl
<< " " << progname << " set +1" << endl
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<< endl;
}
bool print_status(XKeyboard& xkb, string format) {
stringstream r; // resulting string
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for (size_t i = 0; i < format.length(); ++i) {
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if (i < format.length()-1 && format[i] == '%') {
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switch (format[i+1]) {
case 'c':
r << xkb.currentGroupNum();
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break;
case 'n':
r << xkb.currentGroupName();
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break;
case 's':
r << xkb.currentGroupSymbol();
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break;
case 'v':
r << xkb.currentGroupVariant();
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break;
case 'e':
if (xkb.currentGroupVariant().empty())
r << xkb.currentGroupSymbol();
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else
r << xkb.currentGroupVariant();
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break;
case 'C':
r << xkb.groupCount();
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break;
case 'N':
for (size_t j = 0; j < xkb.groupNames().size(); ++j)
r << xkb.groupNames()[j] << endl;
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break;
case 'S':
for (size_t j = 0; j < xkb.groupSymbols().size(); ++j)
r << xkb.groupSymbols()[j] << endl;
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break;
case 'V':
for (size_t j = 0; j < xkb.groupVariants().size(); ++j)
r << xkb.groupVariants()[j] << endl;
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break;
case 'E':
for (size_t j = 0; j < xkb.groupVariants().size(); ++j)
if (xkb.groupVariants()[j].empty())
r << xkb.groupSymbols()[j] << endl;
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else
r << xkb.groupVariants()[j] << endl;
break;
case '%':
r << '%';
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break;
default:
cerr << "Unknown format character: " << format[i+1] << endl;
return false;
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break;
}
++i;
} else { // not '%'
r << format[i];
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}
}
cout << r.str();
return true;
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}
bool set_group(XKeyboard& xkb, string group) {
bool relative = false;
// Check that 'group' is a valid integer (and whether it's relative or not)
size_t i = 0;
if (group[0] == '+' || group[0] == '-') {
relative = true;
++i;
}
for (; i < group.length(); ++i) {
if (!isdigit(group[i])) {
cerr << group << " is not an integer" << endl;
return false;
}
}
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int group_int = atoi(group.c_str());
if (relative) {
if (!xkb.changeGroup(group_int)) {
cerr << "Failed to change group" << endl;
return false;
}
} else {
if (group_int >= xkb.groupCount()) {
cerr << "layout_number must be between 0 and " << xkb.groupCount()-1 << endl;
return false;
} else {
if (!xkb.setGroupByNum(group_int)) {
cerr << "Failed to change group" << endl;
return false;
}
}
}
return true;
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}
int main(int argc, char* argv[])
{
try {
XKeyboard xkb;
if (argc != 3) {
print_usage(string(argv[0]));
return EXIT_FAILURE;
} else {
string command(argv[1]);
if (command == "print") {
if (!print_status(xkb, string(argv[2])))
return EXIT_FAILURE;
} else if (command == "set") {
if (!set_group(xkb, string(argv[2])))
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return EXIT_FAILURE;
} else {
print_usage(string(argv[0]));
return EXIT_FAILURE;
}
}
}
catch (const exception *e) {
cerr << e->what() << endl;
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return EXIT_FAILURE;
}
return EXIT_SUCCESS;
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}