1 files changed, 156 insertions, 0 deletions
diff --git a/src/common.py b/src/common.py
new file mode 100644
index 0000000..476cd38
--- /dev/null
+++ b/src/common.py
@@ -0,0 +1,156 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+'''
+pytagomacs – An Emacs like key–value editor library for Python
+
+Copyright © 2013  Mattias Andrée (maandree@member.fsf.org)
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+'''
+import os
+
+
+
+INACTIVE_COLOUR = '34'
+'''
+:str?  The colour of an inactive line
+'''
+
+ACTIVE_COLOUR = '01;34'
+'''
+:str?  The colour of an active line
+'''
+
+SELECTED_COLOUR = '44;37'
+'''
+:str?  The colour of a selected text
+'''
+
+STATUS_COLOUR = '07'
+'''
+:str?  The colour of the status bar
+'''
+
+ALERT_COLOUR = None
+'''
+:str?  The colour of the alert message
+'''
+
+KILLRING_LIMIT = 50
+'''
+:int  The maximum size of the killring
+'''
+
+EDITRING_LIMIT = 100
+'''
+:int  The maximum size of the editring
+'''
+
+
+atleast = lambda x, minimum : (x is not None) and (x >= minimum)
+'''
+Test that a value is defined and of at least a minimum value
+'''
+
+limit = lambda x_min, x, x_max : min(max(x_min, x), x_max)
+'''
+Limit a value to a closed set
+'''
+
+ctrl = lambda key : chr(ord(key) ^ ord('@'))
+'''
+Return the symbol for a specific letter pressed in combination with Ctrl
+'''
+
+backspace = lambda x : (ord(x) == 127) or (ord(x) == 8)
+'''
+Check if a key stroke is a backspace key stroke
+'''
+
+
+
+class Jump():
+    '''
+    Create a cursor jump that can either be included in a print statement
+    as a string or invoked
+    
+    @param   y:int         The row, 1 based
+    @param   x:int         The column, 1 based
+    @string  :str|()→void  Functor that can be treated as a string for jumping
+    '''
+    def __init__(self, y, x):
+        self.string = '\033[%i;%iH' % (y, x)
+    def __str__(self):
+        return self.string
+    def __call__(self):
+        print(self.string, end = '')
+
+
+## Load extension and configurations via pytagomacsrc.
+config_file = None
+# Possible auto-selected configuration scripts,
+# earlier ones have precedence, we can only select one.
+files = []
+def add_files(var, *ps, multi = False):
+    if var == '~':
+        try:
+            # Get the home (also known as initial) directory of the real user
+            import pwd
+            var = pwd.getpwuid(os.getuid()).pw_dir
+        except:
+            return
+    else:
+        # Resolve environment variable or use empty string if none is selected
+        if (var is None) or (var in os.environ) and (not os.environ[var] == ''):
+            var = '' if var is None else os.environ[var]
+        else:
+            return
+    paths = [var]
+    # Split environment variable value if it is a multi valeu variable
+    if multi and os.pathsep in var:
+        paths = [v for v in var.split(os.pathsep) if not v == '']
+    # Add files according to patterns
+    for p in ps:
+        p = p.replace('/', os.sep).replace('%', 'pytagomacs')
+        for v in paths:
+            files.append(v + p)
+add_files('XDG_CONFIG_HOME', '/%/%rc', '/%rc')
+add_files('HOME',            '/.config/%/%rc', '/.config/%rc', '/.%rc')
+add_files('~',               '/.config/%/%rc', '/.config/%rc', '/.%rc')
+add_files('XDG_CONFIG_DIRS', '/%rc', multi = True)
+add_files(None,              '/etc/%rc')
+for file in files:
+    # If the file we exists,
+    if os.path.exists(file):
+        # select it,
+        config_file = file
+        # and stop trying files with lower precedence.
+        break
+if config_file is not None:
+    code = None
+    # Read configuration script file
+    with open(config_file, 'rb') as script:
+        code = script.read()
+    # Decode configurion script file and add a line break
+    # at the end to ensure that the last line is empty.
+    # If it is not, we will get errors.
+    code = code.decode('utf-8', 'error') + '\n'
+    # Compile the configuration script,
+    code = compile(code, config_file, 'exec')
+    # and run it, with it have the same
+    # globals as this module, so that it can
+    # not only use want we have defined, but
+    # also redefine it for us.
+    exec(code, globals())
+