Added examples
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uebung7/uebung07-examples/tasks_lib.py
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208
uebung7/uebung07-examples/tasks_lib.py
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# coding=utf-8
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import datetime
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import json
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import os
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import sys
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import time
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from os import listdir
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from os.path import isfile, join
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# -------------------------------------------------------------------------------------
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# Hilfsfunktionen
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# -------------------------------------------------------------------------------------
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# enc_print zur Behebung des UTF-Problems mit dem Übungsserver
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def enc_print(string='', encoding='utf8'):
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sys.stdout.buffer.write(string.encode(encoding) + b'\n')
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# Erzeugt einen HTTP-Redirect
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def redirect(location):
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print("Status: 303 See Other")
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print("Location: {}".format(location))
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print()
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# Liefert die aktuelle Uhrzeit im Format Jahr-Monat-Tag-Stunde-Minute-Sekunde
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def get_timestamp():
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return time.strftime("%Y-%m-%d-%H-%M-%S")
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# Konvertiert einene Timestamp im Format Jahr-Monat-Tag-Stunde-Minute-Sekunde in die Form Tag.Monat.Jahr
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def readable_timestamp(timestamp):
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return datetime.datetime.strptime(timestamp, "%Y-%m-%d-%H-%M-%S").strftime("%d.%m.%Y")
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# -------------------------------------------------------------------------------------
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# Layout-Funktionen
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# -------------------------------------------------------------------------------------
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# Gibt den Header der Seite mit optionalem Titel aus
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def print_header(title=""):
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enc_print("Content-type: text/html\n")
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enc_print("""
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<!DOCTYPE html>
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<html lang="de">
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<head>
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<meta charset="UTF-8">
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<title>{}</title>
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<link rel="stylesheet" href="style.css">
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</head>
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<body>
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<h1>{}</h1>
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""".format(title, title))
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# Gibt den Footer aus
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def print_footer():
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enc_print("""
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</body>
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</html>
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""")
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def print_navigation():
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enc_print("""
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<p>
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<a href="tasks-show.py">Alle Aufgaben anzeigen</a> -
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<a href="tasks-show.py?state=open">Offene Aufgaben anzeigen</a> -
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<a href="tasks-show.py?state=done">Bereits erledigte Aufgaben anzeigen</a>
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</p>
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""")
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# Gibt alle Tasks in einer Tabelle aus
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def print_tasks(tasks):
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if len(tasks) == 0:
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enc_print("Noch keine Aufgaben vorhanden ...")
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else:
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enc_print("<table>")
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for t in tasks:
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# Symbol für "Haken" und "Kreuz" in Abhängigkeit davon, ob der Task erledigt wurde
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symbol = "✗" if t["state"] == "done" else "✓"
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# Tabellenzeile ausgeben
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enc_print("""<tr>
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<td class="{}">{} <span style='font-size: x-small'>({})</span></td>
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<td class="min"><form action="tasks-update.py" method="post"><button name="timestamp" value="{}">{}</button></form></td>
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<td class="min"><form action="tasks-delete.py" method="post"><button name="timestamp" value="{}">🗑</button> </form></td>
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</tr>""".format(t["state"],
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t["title"],
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readable_timestamp(t["timestamp"]),
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t["timestamp"],
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symbol,
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t["timestamp"]))
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enc_print("</table>")
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# Gibt das Formular zum Anlegen eines Tasks aus
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def print_form():
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enc_print("""
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<form action="tasks-store.py" method="post" style="margin-top: 2em">
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<label for="title">Neue Aufgabe hinzufügen:</label>
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<input type="text" name="title" id="title" required>
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<button>Speichern</button>
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</form>
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""")
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def print_exception_page(title, message, exception):
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print_header(title)
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enc_print("<p>{}</p>".format(message))
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# Exception ausgeben
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enc_print(repr(exception))
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print_footer()
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# -------------------------------------------------------------------------------------
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# IO-Funktionen
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# -------------------------------------------------------------------------------------
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TASKS_PATH = "tasks/"
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# Speichert den Task task json-codiert unter dem Namen filename
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def write_task(filename, task):
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# Speichere das Dictionary JSON-codiert
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with open(join(TASKS_PATH, filename), 'w') as outfile:
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json.dump(task, outfile)
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# Liest den json-codiert gespeicherten Task mit Dateiname filename ein
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def read_task(filename):
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# Öffne den JSON-codierten Task
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with open(join(TASKS_PATH, filename), 'r') as json_file:
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# Decodiere die JSON-Datei in ein Dictionary
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return json.load(json_file)
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# Liefert alle gespeicherten Tasks
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def read_all_tasks():
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# Liefert alle Dateien im Ordner tasks_path
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file_names = [f for f in listdir(TASKS_PATH) if isfile(join(TASKS_PATH, f))]
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# Liest alle vorher bestimmten Tasks ein
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tasks = [read_task(f) for f in file_names]
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# Sortiert die Tasks aufsteigend nach title (mit reverse=TRUE absteigend)
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sorted_tasks = sorted(tasks, key=lambda t: t["title"], reverse=False)
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return sorted_tasks
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# Löscht den Task mit Dateiname filename
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def delete_task(filename):
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os.remove(join(TASKS_PATH, filename))
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# -------------------------------------------------------------------------------------
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# Task-Funktionen
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# -------------------------------------------------------------------------------------
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# Erstellt einen neuen Task mit dem Titel title, dem aktuellen timestamp und dem state open
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def create_task(title):
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# Rufe die aktuelle Uhrzeit ab
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timestamp = get_timestamp()
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# Erstelle den Task als Dictionary
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task = {
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"title": title,
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"timestamp": timestamp,
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"state": "open"
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}
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return task
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# Flippt den Zustand des Tasks zwischen done und open
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def flip_task_state(task):
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if task['state'] == 'done':
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task['state'] = 'open'
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else:
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task['state'] = 'done'
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return task
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# Filtert all_tasks nach allen Tasks state == open
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def get_open_tasks(all_tasks):
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open_tasks = [t for t in all_tasks if t["state"] == "open"]
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return open_tasks
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# Filtert all_tasks nach allen Tasks state == done
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def get_done_tasks(all_tasks):
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open_tasks = [t for t in all_tasks if t["state"] == "done"]
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return open_tasks
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