package_build.py

import os
import sublime
import sublime_plugin


def get_npm_scripts(chosen_directory):
	""" Gets the list of npm scripts defined in the package.json

	Args:
		chosen_directory (str) : The absolute path of the chosen directory.

	Returns:
		npm_scripts (list)     : The list of npm scripts defined in package.json
	"""
	package_json_path = os.path.join(chosen_directory, "package.json")
	with open(package_json_path) as package_json:
		json_data = sublime.decode_value(package_json.read())
		npm_scripts = [key for key in json_data["scripts"]]
	return npm_scripts


class RunNpmScriptsCommand(sublime_plugin.WindowCommand):
	""" Lists all npm projects & then lists all npm scripts. Selecting one of them executes the said npm script.
	"""

	def run(self, use_terminus=False):
		"""Invoked when the command is run and shows a list of folders.

		Args:
			None

		Returns:
			None
		"""
		is_terminus = use_terminus
		global is_terminus
		npm_projects = [x for x in self.window.folders() if os.path.isfile(os.path.join(x, "package.json"))]
		if len(npm_projects) == 0:
			self.window.status_message("No folder in the side bar is an npm project")
			return
		elif len(npm_projects) == 1:
			self.show_npm_scripts(npm_projects, 0)
			return
		self.window.show_quick_panel(npm_projects, lambda id: self.show_npm_scripts(npm_projects, id))


	def show_npm_scripts(self, npm_projects, id):
		"""Shows the npm scripts defined in the package.json of the chosen directory.

		Args:
			npm_projects (list) : List of all folders in side bar that are npm projects.
			id (int)            : The id of the selected folder.

		Returns:
			None
		"""
		chosen_directory = npm_projects[id]
		if id >= 0:
			npm_scripts = get_npm_scripts(chosen_directory)
			if len(npm_scripts) == 0:
				self.window.status_message("No npm scripts in package.json")
			else:
				self.window.show_quick_panel(npm_scripts, lambda id: self.run_build_system(npm_scripts, chosen_directory, id))
		else:
			self.window.status_message("No directory chosen")


	def run_build_system(self, npm_scripts, chosen_directory, id):
		"""Runs the exec command & passes it on some parameters for running the chosen npm script.

		Args:
			npm_scripts (list)     : A list of npm scripts defined in the package.json of the chosen directory.
			chosen_directory (str) : The absolute path of the selected directory
			id (int)               : The id of the npm script selected.

		Returns:
			None
		"""
		if id >= 0:
			is_terminus_installed = "Terminus" in sublime.load_settings("Package Control.sublime-settings").get("installed_packages")
			target = "terminus_exec" if (is_terminus and is_terminus_installed) else "exec"
			self.window.run_command(target, {
				"shell_cmd": "npm run {}".format(npm_scripts[id]),
				"working_dir": chosen_directory
			})
		else:
			self.window.status_message("No npm script selected")

Globals are bad (global is_terminus).
You should just pass the setting along the chain of execution.
Also, you should specify default value for the command argument (use_terminus=False), otherwise it will crash when not specified.

@rchl Yes, I do know that globals are bad but I don't know if I can pass it down to the run_build_system method in a "cleaner" way in the sense that the show_npm_scripts method has nothing to do with use_terminus but it still gets that value (Kind of like props in React, if you need to pass some piece of state to the last component in a list of components, then the intermediate components also get's the state even though that piece of state is of no use in those components). As for the other silly mistake, it's fixed. Thanks a lot !

I have updated the plugin to now show only the npm scripts in a panel if there is only one project in the sidebar that contains a package.json so now there is no need of an intermediate panel that shows only one project in a panel.
Please feel free to report any issues.

Just a question,
If I have a script serve which starts a server at localhost:3000, for example.
How will I be able to stop the server?

@predragnikolic Right now I am not sure if there is a way I can handle that from the plugin itself (I'll look into it). As a workaround, you can define a keybinding as follows :-

{
	"keys": ["ctrl+alt+6"],
	"command": "exec",
	"args": {
		"kill": true,
	},
}

which should kill the running server when the exec command is running. If you are using terminus however, this is not required as you can press ctrl + c in the terminus build panel and kill the server.

Thanks :-)