Preparation for native gui development

README

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-YMS - Yacht Managemet System
+YMS - Yacht Management System
 Prototype
 

yms/__init.py__

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+__doc__ = """YMS"""

yms/database.py

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+import MySQLdb
+
+class Database():
+
+    def __init__(self, hostname, dbname):
+        self.hostname = hostname
+        self.schema = dbname
+        self.conn = None
+        self.cur = None
+        self.dcur = None
+
+    def connect(self, dbuser, dbpass):
+        if self.conn:
+            return True
+        MySQLdb.paramstyle = 'pyformat'
+        try:
+            self.conn = MySQLdb.connect(host=self.hostname, db=self.schema,
+                user=dbuser, passwd=dbpass, charset='utf8')
+        except MySQLdb.Error as e:
+            print(e)
+            return False
+        self.cur = self.conn.cursor()
+        self.dcur = self.conn.cursor(MySQLdb.cursors.DictCursor)
+        return True
+
+    def disconnect(self):
+        self.cur.close()
+        self.dcur.close()
+        self.conn.close()
+
+    def is_connected(self):
+        return self.conn.open

ymsgui.py

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+#!/usr/bin/python3
+
+"""
+
+Configuration file located at ~/.config/ymsgui.conf:
+  [DB]
+  host = localhost
+  db = yms
+  user = yms
+  pass = topsecret
+
+"""
+
+import os
+import sys
+import locale
+import configparser
+
+import gi
+gi.require_version("Gtk", "3.0")
+from gi.repository import GLib, Gtk
+
+from yms import database
+
+cfg = {
+    'cfgfile': '~/.config/ymsgui.conf',
+    'host': 'localhost',
+    'db': 'yms',
+    'user': 'yms'
+}
+
+class Frontend(Gtk.Window):
+
+    def __init__(self):
+        super().__init__()
+        self.connect("destroy", self.on_destroy)
+
+    def run(self):
+        self.show_all()
+        Gtk.main()
+
+    def on_destroy(self, widget, data=None):
+        Gtk.main_quit()
+
+def messagebox(messagetext, symbol=None, title=None, parent=None):
+    if not symbol:
+        symbol = Gtk.MessageType.INFO
+    if parent:
+        symbol |= Gtk.DIALOG_DESTROY_WITH_PARENT
+    md = Gtk.MessageDialog(parent=parent, flags=0, message_type=symbol, buttons=Gtk.ButtonsType.CLOSE)
+    md.set_markup(messagetext)
+    if title:
+        md.set_title(title)
+    if not parent:
+        md.set_position(Gtk.WindowPosition.CENTER)
+    md.run()
+    md.destroy()
+
+if __name__ == "__main__":
+    locale.setlocale(locale.LC_ALL, '')
+    config = configparser.ConfigParser()
+    if not config.read(os.path.expanduser(cfg['cfgfile'])):
+        messagebox("Configuration file not found", title="YMS")
+    else:
+        cfg['host'] = config.get('DB', 'host')
+        cfg['db'] = config.get('DB', 'db')
+        cfg['user'] = config.get('DB', 'user')
+        cfg['pass'] = config.get('DB', 'pass')
+        db = database.Database(cfg['host'], cfg['db'])
+        if db.connect(cfg['user'], cfg['pass']):
+            app = Frontend()
+            app.run()
+            db.disconnect()
+        else:
+            messagebox("Database connection cannot be established", title="YMS")
+
+# Another fine product of the sirius cybernetics corporation