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—howtos:convert_camelcase [2011/09/14 10:54] (current) – add page about easily convert camelcase strings in Geany enrico
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 +====== Convert CamelCase to lower_case_underscore and vice versa ======
  
 +With the following script you can easily convert a selected string in Geany to CamelCase or lower_case_underscore format depending on the source format of the string.
 +
 +===== Installation =====
 +
 +  * Python is required (works with Python 2 and 3)
 +  * Simply copy the script somewhere on your system, e.g. ///home/<username>/bin/geany_camel_case.py//.
 +  * Configure Geany: Edit->Format->Send Selection to->Set Custom Commands
 +  * In the dialog add a new command and simply use: //python /home/<username>/bin/geany_camel_case.py//
 +
 +===== Usage =====
 +
 +Select some string in Geany and use Edit->Format->Send Selection to-><your configured command> and Geany will replace the string by the converted version.
 +Alternatively, you can use the shortcut Ctrl-<number> in case your command is one of the first three configured commands.
 +For details, read the [[http://www.geany.org/manual/#sending-text-through-custom-commands|documentation about Send Selection to commands]].
 +
 +
 +===== The script =====
 +
 +<file python geany_camel_case.py>
 +#!/usr/bin/env python
 +# -*- coding: utf-8 -*-
 +
 +import sys
 +
 +
 +#----------------------------------------------------------------------
 +def camel_case_to_lower_case_underscore(string):
 +    """
 +    Split string by upper case letters.
 +
 +    F.e. useful to convert camel case strings to underscore separated ones.
 +
 +    @return words (list)
 +    """
 +    words = []
 +    from_char_position = 0
 +    for current_char_position, char in enumerate(string):
 +        if char.isupper() and from_char_position < current_char_position:
 +            words.append(string[from_char_position:current_char_position].lower())
 +            from_char_position = current_char_position
 +    words.append(string[from_char_position:].lower())
 +    return '_'.join(words)
 +
 +
 +#----------------------------------------------------------------------
 +def lower_case_underscore_to_camel_case(string):
 +    """Convert string or unicode from lower-case underscore to camel-case"""
 +    splitted_string = string.split('_')
 +    # use string's class to work on the string to keep its type
 +    class_ = string.__class__
 +    return splitted_string[0] + class_.join('', map(class_.capitalize, splitted_string[1:]))
 +
 +
 +#----------------------------------------------------------------------
 +def read_data():
 +    return sys.stdin.read()
 +
 +
 +#----------------------------------------------------------------------
 +def detect_conversion_method(data):
 +    if '_' in data:
 +        return lower_case_underscore_to_camel_case
 +    else:
 +        return camel_case_to_lower_case_underscore
 +
 +
 +#----------------------------------------------------------------------
 +def main():
 +    data = read_data()
 +    conversion_method = detect_conversion_method(data)
 +    result = conversion_method(data)
 +    sys.stdout.write(result)
 +
 +
 +if __name__ == '__main__':
 +    main()
 +
 +</file>
 +
 +
 +{{tag>howto selection camelcase}}

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