import sublime
import os

standard_exec = __import__("exec")


class ExecCommand(standard_exec.ExecCommand):
    def create_output_view(self, title):
        view = self.window.new_file()
        view.settings().set("no_history", True)
        # view.settings().set("gutter", False)
        view.settings().set("line_numbers", False)

        view.settings().set("syntax", "Packages/Python/Python.tmLanguage")
        view.set_name(title)
        view.set_scratch(True)
        return view

    def run(self, cmd = [], file_regex = "", line_regex = "", working_dir = "",
            encoding = "utf-8", env = {}, quiet = False, kill = False,
            title = "", # xeno.by
            # Catches "path" and "shell"
            **kwargs):

        if kill:
            if self.proc:
                self.proc.kill()
                self.proc = None
                self.append_data(None, "[Cancelled]")
            return

        # modified version of xeno.by:
        wannabes = filter(lambda v: v.name() == (title or " ".join(cmd)),
                          self.window.views())
        if len(wannabes):
            self.output_view = wannabes[0]

            self.output_view.show(self.output_view.size())
            self.output_view.set_read_only(False)
            edit = self.output_view.begin_edit()
            self.output_view.erase(edit, sublime.Region(0, self.output_view.size()))
            self.output_view.sel().clear()
            self.output_view.sel().add(sublime.Region(self.output_view.size()))
            self.output_view.end_edit(edit)
            self.output_view.set_read_only(True)
        else:
            self.output_view = self.create_output_view(title or " ".join(cmd))

        # Default the to the current files directory if no working directory was given
        if (working_dir == "" and self.window.active_view()
                        and self.window.active_view().file_name()):
            working_dir = os.path.dirname(self.window.active_view().file_name())

        self.output_view.settings().set("result_file_regex", file_regex)
        self.output_view.settings().set("result_line_regex", line_regex)
        self.output_view.settings().set("result_base_dir", working_dir)

        self.encoding = encoding
        self.quiet = quiet

        self.proc = None
        if not self.quiet:
            print "Running " + " ".join(cmd)
            sublime.status_message("Running " + " ".join(cmd))

        merged_env = env.copy()
        if self.window.active_view():
            user_env = self.window.active_view().settings().get('build_env')
            if user_env:
                merged_env.update(user_env)

        # Change to the working dir, rather than spawning the process with it,
        # so that emitted working dir relative path names make sense
        if working_dir != "":
            os.chdir(working_dir)

        err_type = OSError
        if os.name == "nt":
            err_type = WindowsError

        try:
            # Forward kwargs to AsyncProcess
            self.proc = standard_exec.AsyncProcess(cmd, merged_env, self, **kwargs)
        except err_type as e:
            self.append_data(None, str(e) + "\n")
            self.append_data(None, "[cmd:  " + str(cmd) + "]\n")
            self.append_data(None, "[dir:  " + str(os.getcwdu()) + "]\n")
            if "PATH" in merged_env:
                self.append_data(None, "[path: " + str(merged_env["PATH"]) + "]\n")
            else:
                self.append_data(None, "[path: " + str(os.environ["PATH"]) + "]\n")
            if not self.quiet:
                self.append_data(None, "[Finished]")