playlist.py (6d1a6cb) - stage_director · BlinkenArea

playlist.py

#! /usr/bin/env python

# BlinkenArea Stage Director
# Copyright 2013 Stefan Schuermans <stefan@blinkenarea.org>
# Copyleft: GNU public license - http://www.gnu.org/copyleft/gpl.html
# a blinkenarea.org project - https://www.blinkenarea.org/

import re
import pango

import time_fmt

class Playlist:
  """ playlist object, reads a playlist form a file and handles the playlist
  entries

playlist file format:
    - each line is an entry or a stop point: <line> = <entry> | <stop point>
    - entries are played one after another
    - playing halts at stop points
    - <entry> = <name> <whitespace> <duration>
    - <stop point> = ""
    - <name> = [A-Za-Z0-9_]+
    - <duration> = ((<hours>:)?<minutes>:)?<seconds>
    - <hours> = [0-9]+
    - <minutes> = [0-9]+
    - <seconds> = [0-9]+(.[0-9]+)"""

def __init__(self):
    """create a new, empty playlist object"""
    self.entries = [] # list of entries
                      # entry = dictionary { "type": "normal" or "stop"
                      #                      "name": string, name of entry
                      #                      "durtaion": float, in seconds }
    self.reEntry = re.compile("^\s*([A-Za-z0-9_]+)\s+([0-9:.]+)\s*$")

def read(self, filename):
    """read the playlist from filename, replacing the current playlist"""
    self.entries = []
    f = open(filename, "r")
    for line in f:
      mEntry = self.reEntry.match(line)
      if mEntry:
        name = mEntry.group(1)
        duration = time_fmt.str2sec(mEntry.group(2))
        self.entries.append({"type":     "normal",
                             "name":     name,
                             "duration": duration})
        #print("DEBUG playlist entry normal %s %f" %
        #      (self.entries[-1]["name"], self.entries[-1]["duration"]))
      else:
        self.entries.append({"type": "stop"})
        #print("DEBUG playlist entry stop")
    f.close()

def update(self, store):
    """update the contents of a Gtk ListStore with the contents of this
    playlist"""
    store.clear()
    idx = 0
    for entry in self.entries:
      if entry["type"] == "normal":
        name = entry["name"]
        duration = time_fmt.sec2str(entry["duration"])
      else:
        name = ""
        duration = "STOP"
      store.append([idx, pango.WEIGHT_NORMAL, name, duration])
      idx = idx + 1

stage_director

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