dbg - Create debugging library

src/dbg.js

@@ -0,0 +1,80 @@
+module.exports = class DBG {
+  /**
+   * @param ${'warn'|'info'|'debug'|'nitpick'} [level='info']
+   **/
+  constructor(level = 'info') {
+    if (this._levels.includes(level)) {
+      this._level = level;
+    } else {
+      throw new Error(`'${level}' is not a valid debug level`);
+    }
+    this._levels.forEach((l) => {
+      this._createLogger(l);
+      this._createGrouper(l)
+      this._createGroupEnder(l)
+      this._createExecer(l)
+    });
+  }
+
+  _levels = ['nitpick', 'debug', 'info', 'warn'];
+  _shortNames = {'nitpick':'nit', 'debug':'d', 'info':'i', 'warn':'warn'};
+
+  _createLogger(name) {
+    const short = this._shortNames[name]
+    this[short] = (s = '') => {
+      if (this._lvl2num(name) >= this._lvl2num(this._level)) {
+        console.log(s);
+      }
+    }
+  }
+
+  _createGrouper(name) {
+    const short = this._shortNames[name]
+    this[short + 'Group'] = (s) => {
+      if (this._lvl2num(name) >= this._lvl2num(this._level)) {
+        console.group(s);
+      }
+    }
+  }
+
+  _createGroupEnder(name) {
+    const short = this._shortNames[name]
+    this[short+'GroupEnd'] = () => {
+      if (this._lvl2num(name) >= this._lvl2num(this._level)) {
+        console.groupEnd();
+      }
+    }
+  }
+
+  _createExecer(name) {
+    const short = this._shortNames[name]
+    this[short+'Exec'] = (func) => {
+      if (this._lvl2num(name) >= this._lvl2num(this._level)) {
+        func();
+      }
+    }
+  }
+
+  _lvl2num(lvl) {
+    return 1 + this._levels.findIndex(l => l === lvl);
+  }
+}
+
+/* TEST
+const dbg = new DBG('nitpick');
+dbg.warnGroup('w');
+dbg.warn('warn');
+dbg.warnGroupEnd();
+
+dbg.iGroup('i');
+dbg.i('info');
+dbg.iGroupEnd();
+
+dbg.dGroup('d');
+dbg.d('debug');
+dbg.dGroupEnd();
+
+dbg.nitGroup('n');
+dbg.nit('nitpick');
+dbg.nitGroupEnd();
+*/