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index.js 3.61 KB
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于小懒 提交于 2018-06-08 20:15 . [feature]:主从表支持。
const xlsx = require('./lib/xlsx-to-json.js');
const path = require('path');
const glob = require('glob');
const config = require('./config.json');
/**
* all commands
*/
let commands = {
"--help": {
"alias": ["-h"],
"desc": "show this help manual.",
"action": showHelp
},
"--export": {
"alias": ["-e"],
"desc": "export excel to json. --export [files]",
"action": exportJson,
"default": true
}
};
let alias_map = {}; // mapping of alias_name -> name
let parsed_cmds = []; //cmds of parsed out.
// process.on('uncaughtException', function(err) {
// console.log('error: ' + err);
// });
//cache of command's key ("--help"...)
let keys = Object.keys(commands);
for (let key in commands) {
let alias_array = commands[key].alias;
alias_array.forEach(e => {
alias_map[e] = key;
});
}
parsed_cmds = parseCommandLine(process.argv);
// console.log("%j", parsed_cmds);
parsed_cmds.forEach(function (e) {
exec(e);
});
/**
* export json
* args: --export [cmd_line_args] [.xlsx files list].
*/
function exportJson(args) {
if (typeof args === 'undefined' || args.length === 0) {
glob(config.xlsx.src, function (err, files) {
if (err) {
console.error("exportJson error:", err);
throw err;
}
files.forEach(item => {
xlsx.toJson(path.join(__dirname, item), path.join(__dirname, config.xlsx.dest));
});
});
} else {
if (args instanceof Array) {
args.forEach(item => {
xlsx.toJson(path.join(__dirname, item), path.join(__dirname, config.xlsx.dest));
});
}
}
}
/**
* show help
*/
function showHelp() {
let usage = "usage: \n";
for (let p in commands) {
if (typeof commands[p] !== "function") {
usage += "\t " + p + "\t " + commands[p].alias + "\t " + commands[p].desc + "\n ";
}
}
usage += "\nexamples: ";
usage += "\n\n $node index.js --export\n\tthis will export all files configed to json.";
usage += "\n\n $node index.js --export ./excel/foo.xlsx ./excel/bar.xlsx\n\tthis will export foo and bar xlsx files.";
console.log(usage);
}
/**************************** parse command line *********************************/
/**
* execute a command
*/
function exec(cmd) {
if (typeof cmd.action === "function") {
cmd.action(cmd.args);
}
}
/**
* parse command line args
*/
function parseCommandLine(args) {
let parsed_cmds = [];
if (args.length <= 2) {
parsed_cmds.push(defaultCommand());
} else {
let cli = args.slice(2);
let pos = 0;
let cmd;
cli.forEach(function (element, index, array) {
//replace alias name with real name.
if (element.indexOf('--') === -1 && element.indexOf('-') === 0) {
cli[index] = alias_map[element];
}
//parse command and args
if (cli[index].indexOf('--') === -1) {
cmd.args.push(cli[index]);
} else {
if (keys[cli[index]] === "undefined") {
throw new Error("not support command:" + cli[index]);
}
pos = index;
cmd = commands[cli[index]];
if (typeof cmd.args === 'undefined') {
cmd.args = [];
}
parsed_cmds.push(cmd);
}
});
}
return parsed_cmds;
}
/**
* default command when no command line argas provided.
*/
function defaultCommand() {
if (keys.length <= 0) {
throw new Error("Error: there is no command at all!");
}
for (let p in commands) {
if (commands[p]["default"]) {
return commands[p];
}
}
if (keys["--help"]) {
return commands["--help"];
} else {
return commands[keys[0]];
}
}
/*************************************************************************/
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