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var util = require('util');
var terms = [
'ansi',
'vt100',
'xtermc',
'xterm-color',
'gnome-terminal'
];
exports.Stream = function (system) {
var self = Object.create(system.stdout);
var output = system.stdout;
var errput = system.stderr;
var env = system.env || {};
var fore = "";
var back = "";
var bold = "0";
var stack = [];
var enabled = util.has(terms, env.TERM);
self.writeCode = function (code) {
if (enabled) {
output.flush();
errput.write(code).flush();
}
return self;
};
self.print = function () {
// todo recordSeparator, fieldSeparator
self.write(Array.prototype.join.call(arguments, " ") + "\n");
self.flush();
return self;
};
self.write = function (string) {
var at = 0;
self.update(bold, fore, back);
while (at < string.length) {
var pos = string.indexOf("\0", at);
if (pos == -1) {
// no additional marks, advanced to end
output.write(string.substring(at, string.length));
at = string.length;
} else {
output.write(string.substring(at, pos));
at = pos + 1;
if (string.charAt(at) == ")") {
if (!stack.length)
throw new Error("No colors on the stack at " + at);
var pair = stack.pop();
bold = pair[0];
fore = pair[1];
at = at + 1;
self.update(bold, fore, back);
} else {
var paren = string.indexOf("(", at);
stack.push([bold, fore, back]);
var command = string.substring(at, paren);
if (command == "bold") {
bold = "1";
} else if (Object.prototype.hasOwnProperty.call(exports.colors, command)) {
fore = exports.colors[command];
} else if (
/^:/.test(command) &&
Object.prototype.hasOwnProperty.call(exports.colors, command.substring(1))
) {
back = exports.colors[command.substring(1)];
} else {
throw new Error("No such command: " + command);
}
self.update(bold, fore, back);
at = paren + 1;
}
}
}
self.update("0", "", "");
};
self.update = function (bold, fore, back) {
return self.writeCode(
"\033[" + [
bold,
(fore.length ? "3" + fore : ""),
(back.length ? "4" + back : ""),
].filter(function (string) {
return string.length;
}).join(";") + "m"
);
};
self.moveTo = function (y, x) {
return self.writeCode("\033[" + y + ";" + x + "H");
};
self.moveBy = function (y, x) {
if (y == 0) {
} else if (y < 0) {
self.writeCode("\033[" + (-y) + "A");
} else {
self.writeCode("\033[" + y + "B");
}
if (x == 0) {
} else if (x > 0) {
self.writeCode("\033[" + x + "C");
} else {
self.writeCode("\033[" + (-x) + "D");
}
errput.flush();
return self;
};
self.home = function () {
return self.writeCode("\033[H");
};
self.clear = function () {
return self.writeCode("\033[2J");
};
self.clearUp = function () {
return self.writeCode("\033[1J");
};
self.cearDown = function () {
return self.writeCode("\033[J");
};
self.clearLine = function () {
return self.writeCode("\033[2K");
};
self.clearLeft = function () {
return self.writeCode("\033[1K");
};
self.clearRight = function () {
return self.writeCode("\033[K");
};
self.update(bold, fore, back);
return self;
};
exports.colors = {
"black": "0",
"red": "1",
"green": "2",
"orange": "3",
"yellow": "3",
"blue": "4",
"violet": "5",
"magenta": "5",
"purple": "5",
"cyan": "6",
"white": "7"
}
exports.stream = new exports.Stream(system);
if (module.id == require.main) {
exports.stream.print("white\0red(red\0blue(blue\0)red\0)white");
Object.keys(exports.colors).forEach(function (name) {
exports.stream.print("\0" + name + "(" + name + "\0)");
exports.stream.print("\0bold(\0" + name + "(" + name + "\0)\0)");
});
}
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