☘️ Convert to single python file

Issue: #10

builder.py

@@ -0,0 +1,95 @@
+#!/usr/bin/env python
+import yaml
+
+import os
+import sys
+
+
+def run(arguments):
+    try:
+        project = parse_project_config()
+        command = project.get_command(command_to_run(arguments))
+        execute(command)
+    except ValueError as error:
+        print error
+
+
+class Project:
+    def __init__(self, name, commands):
+        self.name = name
+        self.commands = commands
+
+    def get_command(self, command_name):
+        if self.__has_command__(command_name):
+            for cmd in self.commands:
+                if cmd.name == command_name:
+                    return cmd
+        else:
+            raise ValueError("No command " + command_name + " found in config file `1build.yaml` \n" +
+                             "Available commands:" + "\n" +
+                             self.available_commands()
+                             )
+
+    def __has_command__(self, command_name):
+        for cmd in self.commands:
+            if cmd.name == command_name:
+                return True
+        return False
+
+    def available_commands(self):
+        return "\n".join(map(str, self.commands))
+
+    def __str__(self):
+        return "Project Name: " + self.name + " \nAvailable commands:\n" + self.available_commands()
+
+
+class Command:
+    def __init__(self, name, cmd, description):
+        self.name = name
+        self.cmd = cmd
+        self.description = description
+
+    def __str__(self):
+        return "Name: " + self.name + " | command: " + self.cmd + " | description: " + self.description
+
+
+def execute(command):
+    print("---------------------------------------------------")
+    print ("Name: " + command.name)
+    print ("Command: " + command.cmd)
+    print ("Description: " + command.description)
+    print("---------------------------------------------------")
+    os.system(command.cmd)
+
+
+def parse_command(raw_string):
+    command_name = next(iter(raw_string), None)
+    return Command(name=command_name, cmd=raw_string.get(command_name)["cmd"],
+                   description=raw_string.get(command_name)["description"])
+
+
+def get_command_list_from_config(raw_string):
+    commands = []
+    for cmd in raw_string: commands.append(parse_command(cmd))
+    return commands
+
+
+def parse_project_config():
+    with open("1build.yaml", 'r') as stream:
+        try:
+            content = yaml.safe_load(stream)
+        except yaml.YAMLError, exc:
+            raise ValueError(
+                "Error in parsing `1build.yaml` config file. Make sure file is in correct format. \n\n" + exc.__str__()
+            )
+        return Project(name=(content["project"]), commands=(get_command_list_from_config(content["commands"])))
+
+
+def command_to_run(arguments):
+    if len(arguments) is 1:
+        return "build"
+    else:
+        return arguments[1]
+
+
+run(sys.argv)