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Terminal.js
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Terminal.js
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/* Basic output syntax options (don't need to do any):
Core is basic HTML
Mark text to be hightlighted with ![text goes here]
Mark text to be a specific color with #165284[text goes here] where #165284 is your hex color code
Mark text to be a function that can be run by clicking on it with @{function}, e.g. @{help} or @{install session}
*/
function Terminal(cmdID,prmpt,input_div,output_div,prompt_div,container,theme_file){
this.ID = cmdID;
this.title = "emerix";
this.version = 0.3;
this.releaseDate = "2019-04-28; content-update: 2024-03-15";
this.prompt = prmpt;
this.base_prompt = prmpt;
this.next_prompt = prmpt;
this.cmd_hist = [];
this.cmd_hist_pos = 0;
this.cmd_hist_size = 100; // limit for history storage (allows more during a session, but limits in localstorage)
// TODO: hist_size resets to 100 at each new load. Should be stored as a localstorage setting (as should others)
this.max_tab_list = 50;
this.input_div = document.getElementById(input_div);
this.output_div = document.getElementById(output_div);
this.prompt_div = document.getElementById(prompt_div);
this.body = document.getElementById(container);
this.active = true;
this.program = "base"; // what program we're currently in (base is normal commands)
this.piping = false; // used to "pipe" command outputs to another command ("|" symbol)
this.pipe_function = null; // what command to pass the output to if "piping" (assigned automatically with whatever is after the | symbol)
this.defaultTheme = "dracula"; // overridden by user's local settings in this.loadLocalContent();
this.cols = {};
this.cols.output = '#FFF';
this.cols.feedback = '#9CF';
this.cols.error = '#E85555';
this.cols.bg = '#000';
this.loadThemes(theme_file);
this.loadLocalContent();
var trmnl = this;
// set up clicking within terminal to move focus to input:
this.body.onclick = function(){
trmnl.input_div.focus();
};
this.output_div.innerHTML = "";
if(this.title != undefined && this.title != null){
var out = document.createElement("div");
out.classList.add("cmd-feedback");
out.classList.add("output-line");
out.innerHTML = this.title+" v"+this.version+" || terminal:"+this.ID+"<br /><i>[release: "+this.releaseDate+"]</i>";
this.output_div.appendChild(out);
}
this.prompt_div.innerHTML = this.prompt.replace("[d]","").replace("[t]","");
this.input_div.onkeydown = (function(e){
if(trmnl.active){
var code = (e.keyCode ? e.keyCode : e.which);
if(code == 9){ //tab autocomplete or next screen if option held and multiple terminals open
if(e.altKey){
e.preventDefault();
const curID = trmnl.ID;
newID = curID + 1;
while(typeof(terminal[newID]) !== "object" && newID != curID){
newID++;
newID = newID > 3 ? 0 : newID;
}
if(newID != curID)
terminal[newID].input_div.focus();
}else{
e.preventDefault();
let thusfar = this.value;
if(thusfar.indexOf('|') > -1){ // if we're piping a command, run autocomplete on last command
const cmdPop = thusfar.split('|');
thusfar = cmdPop[cmdPop.length-1];
}
let subfar = thusfar.split(" ");
const cmdIn = subfar[0];
subfar = subfar[subfar.length-1];
let results = [];
let options = trmnl[trmnl.program].autocomplete;
if(typeof(trmnl[trmnl.program][cmdIn]) == "function"){
if(typeof(trmnl[trmnl.program][cmdIn].autocomplete) == "function"){
options = trmnl[trmnl.program][cmdIn].autocomplete(trmnl,subfar);
}else{
options = []; // don't autcomplete anything if the command doesn't give options
}
}
if(subfar == ""){
results = options;
}else{
for(let i = 0; i < options.length; i++){
if(options[i].indexOf(subfar) == 0){ //starts with correct
if(options[i] != subfar){ // no need to add if identical
//results.push(thusfar+trmnl[trmnl.program].autocomplete[i].slice(thusfar.length, trmnl[trmnl.program].autocomplete[i].length));
results.push(options[i]);
}
}
}
}
if(results.length == 1){
//trmnl.input_div.value = results[0]; // update the input if one match been found
trmnl.input_div.value += results[0].slice(subfar.length, results[0].length);
}else if(results.length > 1 && results.length <= trmnl.max_tab_list){ // list all options below, if fewer than max_tab_list
let tbl_out = `<hr />${results.length} autocomplete options:<table><tr>`;
for(let r = 0; r < results.length; r++){
tbl_out += "<td>"+results[r]+"</td>";
if((r+1) % 5 == 0 && r != results.length-1) tbl_out += "</tr>"; // never add this to last item, as it will be added below.
}
tbl_out += "</tr></table>";
trmnl.output(tbl_out,0);
}else if(results.length > trmnl.max_tab_list){
trmnl.output(results.length+" options found, narrow search by entering characters. This will list up to "+trmnl.max_tab_list+" items",0);
}
}
return false;
}else if(code == 13){
e.preventDefault();
var cmd = this.value;
trmnl.parse_command(cmd,1);
}else if(code == 27){
//trmnl.reset();
trmnl.input_div.value = "";
}else if(code == 38){ //up arrow
trmnl.cmd_hist_pos++;
if(trmnl.cmd_hist_pos > trmnl.cmd_hist.length)
trmnl.cmd_hist_pos = trmnl.cmd_hist.length;
// this is to vaguely sanitize the history, stripping unwanted html:
let new_cmd = document.createElement('div');
new_cmd.innerHTML = trmnl.cmd_hist[trmnl.cmd_hist.length-trmnl.cmd_hist_pos];
new_cmd = new_cmd.innerText;
if(new_cmd != "undefined") // allowing && command chaining has broken this a little
this.value = new_cmd;
e.preventDefault();
}else if(code == 40){ //down arrow
trmnl.cmd_hist_pos--;
if(trmnl.cmd_hist_pos<0)
trmnl.cmd_hist_pos = 0;
// this is to vaguely sanitize the history, stripping unwanted html:
let new_cmd = document.createElement('div');
new_cmd.innerHTML = trmnl.cmd_hist[trmnl.cmd_hist.length-trmnl.cmd_hist_pos];
new_cmd = new_cmd.innerText;
if(new_cmd != "undefined")
this.value = new_cmd;
e.preventDefault();
}
}
});
this.base = {};
this.base.protected = {}; // used to write the fallback function, without adding it to the user accessible commands
this.base.protected.fallback = function(cmd,fn,args,trmnl){
// any attempts at parsing unknown commands can be placed here.
return [1, "Unknown command "+fn];
// TODO: update this so that it checks available installation packages and prompts to install if it exists?
}
let auto_progs = ['base']; // for autocomplete compilation (a few lines below)
/**************************************************************/
/*** base functions (i.e. commands): ***/
/**************************************************************/
for(let command in core){
//TODO: check for duplicates here!
this.base[command] = core[command];
}
/********************************************************/
/*** programs (i.e. non "base" commands): ***/
/********************************************************/
for(let program in programs){
//TODO: check for duplicate program here first
this[program] = programs[program];
auto_progs.push(program); // add the program to the list of programs to compile autocompletion for (below)
}
/***** AUTOCOMPLETES: *****/
for(var a = 0; a < auto_progs.length; a++){
this.update_autocomplete(auto_progs[a]);
}
/**** Run the startup items, if any exist: ****/
for(let item in this.startUpItems){
//this.base[item]() // Hold up, we need to work out an input format:
// Probably pass arguments in startup command like this: "startup theme[darkmatter] currency version arglist[these,are,arguments,--and,-flags]"
}
}
/* PROTOTYPES */
Terminal.prototype.update_autocomplete = function(prog){
// AUTOCOMPLETE FOR REQUESTED PROGRAM:
this[prog].autocomplete = [];
for(key in this[prog]){
if(typeof(this[prog][key]) == 'function'){
this[prog].autocomplete.push(key);
}
}
this[prog].autocomplete = this[prog].autocomplete.sort();
}
Terminal.prototype.parse_command = function(cmd,printing = true){
//TODO: should do the actual parsing with regex. Check out http://regexlib.com/Search.aspx?k=command+line&c=-1&m=-1&ps=20 for ideas.
cmd = cmd.replace(/!{2}/g,this.cmd_hist[this.cmd_hist.length-1]); // this line swaps all instances of !! with the previous command
if(cmd.replace(/ /g,'') != ""){
this.cmd_counter++;
var cmdOut = escapeHTML(cmd);
if(this.piping) cmdOut += "|"+this.pipe_function;
if(printing){
this.cmd_hist.push(cmdOut);
// localstorage version of the history:
var tempHist = this.cmd_hist.slice(Math.max(this.cmd_hist.length - this.cmd_hist_size, 0));
tempHist = JSON.stringify(tempHist);
localStorage.setItem("history",tempHist);
this.output(cmdOut,1);
}
}
var separate_cmds = cmd.split('&&'); // logical command sequence, i.e. only keep performing while response less than 1
var resCode = 0;
//TODO: this parsing is getting messy, separate things into functions, e.g. trmnl.getPushes(cmd); trmnl.sendCommand(cmd); trmnl.etc();
for(var s = 0; s < separate_cmds.length; s++){
if(resCode < 1){
cmd = separate_cmds[s];
if(cmd.replace(/ /g,'') != ""){
this.input_div.style.display = "none";
this.prompt_div.style.display = "none";
cmd = cmd.trim();
// check for | in the command, which is used to pipe output from first to input of next command:
if(cmd.indexOf('|') > -1){
this.piping = true;
var pipe_split = cmd.split("|");
cmd = pipe_split[0];
this.pipe_function = pipe_split[1];
}else{
this.piping = false;
this.pipe_function = null;
}
// check for :: in the args, which is used to push the command to a different terminal (if open):
let whoTo = [this];
let noProp = false;
//
const pushReg = /::\d+/g;
const pushVal = cmd.match(pushReg);
if(pushVal != null){
let pop;
whoTo = []; // don't auto-include the calling terminal
for(let p in pushVal){
pop = pushVal[p].replace(/::/g,'');
if(typeof(terminal[pop]) === "object"){
whoTo.push(terminal[pop]);
}else{// mention that it cannot find the requested terminal
this.output("<font class='cmd-feedback'>Terminal "+pop+" does not exist, skipping...</font>");
}
}
// remove all push requests from the command:
cmd = cmd.replace(pushReg,'');
// if whoTo is empty, show an error and set noProp = true;
if(whoTo.length < 1){
this.error("None of the requested terminals exist, cannot proceed");
noProp = true;
}
}
// allow repeating the same command multiple times with !n
const repeatReg = /!\d+/g; // it's global so we can remove them all, but we'll only parse the first result
let repeatVal = cmd.match(repeatReg);
if(repeatVal != null){
if(Array.isArray(repeatVal)) repeatVal = repeatVal[0];
repeatVal = repeatVal.replace(/!/g,'');
cmd = cmd.replace(repeatReg,'');
for(let r = 0; r < parseInt(repeatVal)-1; r++){ //TODO: see the comment below, and fix this parser so whole things can be repeated or pushed to another terminal, a la {command | command2} ::1 or {randcol | showcol} !10
separate_cmds.push(cmd); // re-add the command this many times to the separate_cmds to be parsed through in this loop (note this means we cannot repeat both sides of a pipe at once currently)
}
}
if(!noProp){
if(cmd.indexOf('(') > -1 && (cmd.indexOf(' ') < 0 || cmd.indexOf(' ') > cmd.indexOf('('))){ // commands can be passed as either "command(arguments)" or "command arguments". Note that if a space came first, then it's not command(args)
var args = cmd.split("(");
var fn = args[0].trim();
if(args.length > 1){
args.splice(0,1);
args = args[0].slice(0,args[0].length-1).split(",");
for(var a = 0; a < args.length; a++) args[a] = args[a].trim();
}else{
args = '';
}
}else{
var args = cmd.split(" ");
var fn = args[0].trim();
if(args.length > 1){
args.splice(0,1);
// trim each one:
for(var a = 0; a < args.length; a++){
args[a] = args[a].trim();
}
// remove empty arguments (often happens while pushing to another terminal)
args = args.filter(function(item){ return item != ""});
}else{
args = '';
}
}
let response, who;
for(let w = 0; w < whoTo.length; w++){
who = whoTo[w];
if(typeof(who[who.program][fn]) == 'function'){
response = who[who.program][fn](args,who);
}else{
// attempt via the protected.fallback function if exists, else throw error:
if(typeof(who[who.program].protected.fallback) == 'function'){
response = who[who.program].protected.fallback(cmd,fn,args,who); // NOTE that we pass the original command here, as well as fn and args after!
}else{
response = [1, "Unknown command "+fn];
}
}
if(response[0]){
if(response[0] > -1){
if(response[1] == undefined || response[1] == "" || response[1] == null){
this.error("unknown command",cmd);
}else{
this.error(response[1]);
}
}
}else{
if(response[1] != undefined && response[1] != "" && response[1] != null){
if(this.piping){ // passing response onto another function rather than immediate output
response[1] = response[1].replace(/,/g,',');
this.parse_command(this.pipe_function+"("+response[1]+")",0);
// use bracket notation to avoid spaces in output breaking the arguments. But this means we need to sanitize commas out of the output (done above hastily, but need to debug.)
}else{
who.output(response[1],0);
}
}
// success.
}
if(this.next_prompt != this.prompt){
this.set_prompt(this.next_prompt);
}
if(typeof(response) !== "object"){
resCode = response;
}else{
resCode = response[0];
}
}
}else{
this.output("Terminal does not exist, cannot push "+fn+" to it.");
resCode = 1;
}
}
}else{
this.output("Previous command ("+separate_cmds[s-1].trim()+") did not complete: not continuing command sequence",0);
break;
}
this.input_div.value = "";
this.cmd_hist_pos = 0;
if(this.active){
this.input_div.style.display = "block";
this.prompt_div.style.display = "block";
}
}
}
Terminal.prototype.linesep = function(){ // note, can now just use @__ (@ and 2 underscores) in the output to auto-add this
let line = document.createElement("div");
line.classList.add("output-line");
line.innerHTML = "<hr />";
this.output_div.appendChild(line);
};
Terminal.prototype.output = function(output,prompted){
var out, outprompt, outline;
// parse out clickable function shortcuts in the output:
const ID = this.ID;
if(this.program == 'base' || this.program == 'science'){
output = output.replace(/\@\{.+?\}/g, function(match){ // match anything between @{...} in a non-greedy fashion
let cmd = match.replace('@{','');
cmd = cmd.replace('}','');
// can't say I love using onclick:
return '<span class="cmd-shortcut cmd-feedback" title="Click to run \''+cmd+'\' in this terminal..." onclick="javascript:terminal['+ID+'].parse_command(\''+cmd+'\',terminal['+ID+']);">'+cmd+'</span>';
});
// parse the feedback highlights:
output = output.replace(/\!\[.+?\]/g, function(match){ // match anything between ![...] in a non-greedy fashion
match = match.replace('![','').replace(']','');
return '<span class="cmd-feedback">'+match+'</span>';
});
// parse the color requests:
let pop;
output = output.replace(/\#([0-9a-fA-f]{3})(?:[0-9a-fA-f]{3})?\[.+?]/g, function(match){
pop = match.split('[');
return '<span style="color: '+pop[0]+';">'+pop[1].replace(']','</span>');
});
// parse the <hr/> requests
output = output.replace(/@__/g,'<hr />');
// parse the newlines:
output = output.replace(/\n/g,'<br />');
}
if(prompted){
var now = new Date(),
prmpt = this.prompt,
prmpt_title = "";
if(prmpt.indexOf('$') > -1){
prmpt_title = now.getFullYear()+"-"+(now.getMonth()+1)+"-"+now.getDate();
var tm = ("0"+now.getHours()).slice(-2)+":";
tm += ("0"+now.getMinutes()).slice(-2)+":";
tm += ("0"+now.getSeconds()).slice(-2);
prmpt = prmpt.replace('$',tm);
prmpt_title += " @ "+tm;
}
out = document.createElement("div");
out.classList.add("output-line");
outprompt = document.createElement("div");
outprompt.classList.add("cmd-prompt");
outprompt.title = prmpt_title;
outprompt.innerHTML = prmpt;
out.appendChild(outprompt);
outline = document.createElement("span");
outline.innerHTML = output;
out.appendChild(outline);
this.output_div.appendChild(out);
}else{
out = document.createElement("div");
out.classList.add("output-line");
outprompt = document.createElement("div");
outprompt.classList.add("cmd-output");
outprompt.innerHTML = output;
out.appendChild(outprompt);
this.output_div.appendChild(out);
}
var trmnl = this;
setTimeout(function(){trmnl.scrollDown();},10);
}
Terminal.prototype.scrollDown = function(){
let ht = this.body.scrollHeight - this.body.offsetHeight;
this.body.scrollTop = ht;
}
Terminal.prototype.error = function(precursor,val){
let out, outdiv;
out = precursor;
if(val != undefined && val != "" && val != null){
out += ", '"+val+"'";
}
const ID = this.ID;
out = out.replace(/\@\{.+?\}/g, function(match){ // match anything between @{...} in a non-greedy fashion
let cmd = match.replace('@{','');
cmd = cmd.replace('}','');
// can't say I love using onclick:
return '<span class="cmd-shortcut cmd-feedback" title="Click to run \''+cmd+'\' in this terminal..." onclick="javascript:terminal['+ID+'].parse_command(\''+cmd+'\',terminal['+ID+']);">'+cmd+'</span>';
});
// parse the <hr/> requests
out = out.replace(/@__/g,'<hr />');
// parse the newlines:
out = out.replace(/\n/g,'<br />');
outdiv = document.createElement("div");
outdiv.classList.add("cmd-err");
outdiv.innerHTML = "ERROR: "+out;
this.output_div.appendChild(outdiv);
var trmnl = this;
setTimeout(function(){trmnl.scrollDown();},10);
}
Terminal.prototype.reset = function(new_prompt){
if(typeof(new_prompt) != 'undefined' || new_prompt != null || new_prompt != ""){
this.set_prompt(new_prompt);
}
this.input_div.value = "";
}
Terminal.prototype.parse_flags = function(args){
//e.g. [args,flags] = trmnl.parse_flags(args);
var flags = [],
params = [];
for(var a = 0; a < args.length; a++){
if(args[a].charAt(0) == '-'){
if(args[a].charAt(1) == '-'){
flags.push(args[a].substr(2));
}else{
for(var b = 1; b < args[a].length; b++){
flags.push(args[a][b]);
}
}
}else{
params.push(args[a]);
}
}
//console.log(flags);
return [params, flags];
}
Terminal.prototype.set_prompt = function(new_prompt){
if(typeof(new_prompt) == 'undefined' || new_prompt == null || new_prompt == ""){
this.prompt = "$>";
}else{
this.prompt = new_prompt;
}
this.prompt_div.innerHTML = this.prompt;
document.title = this.prompt;
}
Terminal.prototype.update_colors = function(){
this.body.style.background = this.cols.bg;
this.input_div.style.color = this.cols.output;
this.output_div.style.color = this.cols.output;
this.prompt_div.style.color = this.cols.prompt;
var col_setup = "";
for(var t in terminal){
col_setup += '#'+terminal[t].body.getAttribute("id")+' .cmd-prompt {color:'+terminal[t].cols.prompt+';}\n';
col_setup += '#'+terminal[t].body.getAttribute("id")+' .cmd-output {color:'+terminal[t].cols.output+';}\n';
col_setup += '#'+terminal[t].body.getAttribute("id")+' .cmd-err {color:'+terminal[t].cols.error+';}\n';
col_setup += '#'+terminal[t].body.getAttribute("id")+' .cmd-feedback {color:'+terminal[t].cols.feedback+';}\n';
col_setup += '#'+terminal[t].body.getAttribute("id")+' a {color:'+terminal[t].cols.feedback+';}\n';
}
document.getElementById('dynamic-cols').innerHTML = col_setup;
// I do not like the feel of the method above (with the inline style in the head), but it allows for future elements to have their css altered also.
}
Terminal.prototype.loadLocalContent = function(){
// All of these are localstorage, i.e. computer-specific
// load locally stored command history, if present:
const localhist = JSON.parse(localStorage.getItem("history"));
if(localhist !== null){
// check if it's the appropriate data and format for this.cmd_hist and apply it if so
if(localhist.constructor === Array){ // it's an array...
if(localhist.every(function(i){ return typeof i === "string" })){ // they're all strings :)
this.cmd_hist = localhist;
}
}
}
// load startup items, if present, and run them:
const startups = JSON.parse(localStorage.getItem("startup"));
this.startUpItems = [];
if(startups !== null){
if(startups.constructor === Array){
if(startups.every(function(i){ return typeof i === "string" })){ // they're all strings :)
this.startUpItems = startups;
}
}
}
// check if the user has a default theme:
const defaultTheme = JSON.parse(localStorage.getItem("theme"));
if(defaultTheme !== null && typeof(defaultTheme) === "string"){
this.defaultTheme = defaultTheme;
}
};
Terminal.prototype.loadThemes = function(theme_file){
//TODO: make a loading bar for the terminal and don't allow access until this completes or has an error (in which case, no themes)
// Load up the themes.json file:
this.theme_file = theme_file+"?"+Date.now();
this.themes = {};
let me = this;
let xhr = new XMLHttpRequest();
xhr.open('GET', me.theme_file, true);
xhr.onload = function(){
const themes = JSON.parse(this.responseText);
me.themes = themes;
let theme_help = "<b>THEME</b> command: change terminal to a different theme. Available themes are: <hr /><table><tr>";
let c = 0;
for(let t in themes){
theme_help += "<td class='cmd-feedback'>"+t+"</td>";
c++;
if(c%6 == 0 && c != 1) theme_help += '</tr><tr>';
}
theme_help += "</tr></table>";
theme_help += "Use -p or --permanent flag to set the chosen theme as the default for this machine";
me.base.theme.help = theme_help;
// Apply user's permanent theme:
//me.base.theme(me.defaultTheme,me); // Not working...
me.parse_command(`theme ${me.defaultTheme}`,0); // the above doesn't work but this does. //TODO: look into this.
};
xhr.onerror = function(err){
me.output("<span class='cmd-feedback'>Couldn't load the themes file, only default theme available.</span>"); // why didn't I make terminal.feedback a method?!
console.log(err);
}
xhr.send(null);
}
//TODO: start using the below xhrPromise method!
// New method to use to replace all xhr calls that hide and re-show the terminal:
// e.g. let response = await me.xhrPromise(url);
Terminal.prototype.xhrPromise = function(url, method='GET'){
//TODO: could open this up to different responseType too (i.e. function(url, method='GET', type='json'))
return new Promise(function(resolve, reject){
let xhr = new XMLHttpRequest();
xhr.open(method, url, true);
xhr.onload = function(){
resolve(this.responseText);
};
xhr.onerror = function(err){
reject({
status: this.status,
statusText: xhr.statusText
});
};
xhr.send(null);
});
};
Terminal.prototype.exit = function(callingID){
var w = this.ID;
// work out which are open based on which terminal[n] is an object, e.g. 0,1,3
// then bitshift for a switch on how the layout should look. So [0,1,3] becomes 1011 in binary becomes 11 in decimal.
// maybe not. that's a lot of overlapping layout scenarios for individual screens. hmm. Done below anyway.
delete terminal[w];
// TODO: this is weird, check it and simplify if possible:
document.getElementById("term_"+w).innerHTML = "<div id=\"cmd-history_"+w+"\" class=\"cmd-history\"></div>\n\t\t<div id=\"input-line_"+w+"\" class=\"input-line\">\n\t\t\t<div class=\"cmd-prompt\" id=\"cmd-prompt_"+w+"\">$></div>\n\t\t\t<div id=\"cmd-input_"+w+"\" class=\"cmd-input\"><input id=\"main-input_"+w+"\" class=\"main-input\" type=\"text\" spellcheck=\"false\"/></div>"; // reset the terminal container
instances--;
// attempt to change focus to the screen closest to the closed one.
// N.B. that this shouldn't be done if this was called as a kill command
// from another terminal, in which case we don't want to change focus.
if(callingID == w){
var chg_to = w - 1;
while(typeof(terminal[chg_to]) != "object" && chg_to != w){
chg_to--;
chg_to = chg_to < 0 ? 3 : chg_to;
}
}else{
chg_to = callingID;
}
if(typeof(terminal[chg_to]) == "object")
terminal[chg_to].input_div.focus();
update_positions();
}