Remove writers from lib

Closes #4

src/types.ts

@@ -1,5 +1,3 @@
-import { Chalk } from 'chalk'
-
 export type Options = {
     format: string,
 }
@@ -27,33 +25,19 @@ export type WriterOptions = {
     [key: string | number | symbol]: any,
 }
 
-export function level_to_string(level: Level, with_color: boolean) : string {
-    const str = get_string(level)
+export abstract class Writer {
+    protected readonly _options: WriterOptions;
+    protected constructor(options: WriterOptions) {
+        this._options = options
+    }
 
-    if (!with_color) return str
+    public log(level: Level, ...data: any[]) : void {
+        if (level < this.options.minLevel) return
+        this.write(level, ...data)
+    }
+    protected abstract write(level: Level, ...data: any[]) : void;
 
-    const color = get_color(level)
-    return color(str)
-}
-
-function get_string(level: Level) : string {
-    switch (level) {
-        case Level.DEBUG: return "DEBUG  "
-        case Level.TRACE: return "TRACE  "
-        case Level.INFO: return "INFO   "
-        case Level.WARNING: return "WARNING"
-        case Level.ERROR: return "ERROR  "
-    }
-}
-
-const chalk = new Chalk({ level: 2 }) // 256 colors
-
-function get_color(level: Level) {
-    switch (level) {
-        case Level.DEBUG: return chalk.blueBright
-        case Level.TRACE: return chalk.green
-        case Level.INFO: return (str: string) => str
-        case Level.WARNING: return chalk.hex('#FFA500')
-        case Level.ERROR: return chalk.red
+    public get options() : WriterOptions {
+        return this._options
     }
 }