Create simple GUIs using the Wofi application
What is Wofi?
Wofi is a launcher/menu program for wlroots based wayland compositors such as sway. Its basic operation is to display a list of options and let the user pick one. The following screenshot is shamelessly hotlinked from the wofi website (which you should probably visit if you want actual details about wofi!).
What is this module?
It simplifies making simple GUIs using Wofi. It provides a class with a number of methods for various GUI actions (show messages, pick one of these options, enter some text / a number). These are translated to the appropriate Wofi command line options, and then the standard subprocess module is used to run Wofi. Any output is then processed and returned to you to do whatever you like with.
The simplest example is to create a Wofi instance and prompt the user to enter a piece of text:
from wofi import Wofi r = Wofi() name = r.text_entry('What is your name? ')
There are also entry methods for integers, floating-point numbers, and decimal numbers:
age = r.integer_entry('How old are you? ') height = r.float_entry('How tall are you? ') price = r.decimal_entry('How much are you willing to spend? ')
All of these return the corresponding Python type. Dates and times can also be requested:
dob = r.date_entry('What is your date of birth? ') start = r.time_entry('When do you start work? ') reminder = r.datetime_entry('When do you want to be alerted? ')
Again, these return the corresponding Python type. By default, they expect the user to enter something in the appropriate format for the current locale. You can override this by providing a list of format specifiers to any of these functions. The available specifiers are detailed in the Python documentation for the datetime module. For example:
start = r.time_entry('When do you start work? ', formats=['%H:%M'])
All of these entry methods are specialisations of the generic_entry() method. You can use this to create your own entry types. All you need to do is create a validator function which takes the text entered by the user, and returns either the Python object or an error message. For example, to enforce a minimum length on an entered piece of text:
validator = lambda s: (s, None) if len(s) > 6 else (None, "Too short!") r.generic_entry('Enter a 7-character or longer string: ', validator)
Note that all of these methods return None if the dialog is cancelled.
To show an error message to the user:
r.error('I cannot let you do that.') r.exit_with_error('I cannot let you do that.')
The latter shows the error message and then exits.
To give the user a list of things to select from, and return the index of the option they chose:
options = ['Red', 'Green', 'Blue', 'White', 'Silver', 'Black', 'Other'] index, key = r.select('What colour car do you drive?', options)
The returned key value tells you what key the user pressed. For Enter, the value is 0, while -1 indicates they cancelled the dialog. You can also specify custom key bindings:
index, key = r.select('What colour car do you drive?', options, key5=('Alt+n', "I don't drive"))
In this case, the returned key will be 5 if they press Alt+n.
To display a status message to the user:
r.status("I'm working on that...")
This is the only non-blocking method (all the others wait for the user to finish before returning control to your script). To close the status message:
Calling a display or entry method will also close any status message currently displayed.
Any of the entry methods and the select method have an optional argument message. This is a string which is displayed below the prompt. The string can contain Pango markup:
r.text_entry('What are your goals for this year? ', message='Be <b>bold</b>!')
If you need to escape a string to avoid it being mistaken for markup, use the Wofi.escape() class method:
msg = Wofi.escape('Format: <firstname> <lastname>') r.text_entry('Enter your name: ', message=msg)
There are a number of options available to customise the display. These can be set in the initialiser to apply to every dialog displayed, or you can pass them to any of the display methods to change just that dialog. See the Wofi documentation for full details of these parameters.
lines: The maximum number of lines to show before scrolling.
fixed_lines: Keep a fixed number of lines visible.
width: If positive but not more than 100, this is the percentage of the screen’s width the window takes up. If greater than 100, it is the width in pixels. If negative, it estimates the width required for the corresponding number of characters, i.e., -30 would set the width so approximately 30 characters per row would show.
fullscreen: If True, use the full height and width of the screen.
location: The position of the window on the screen.
You can also pass in arbitrary arguments to wofi through the wofi_args parameter. These have to be passed in as a list of strings, with every argument in a seperate string. For example, to make a selection case insensitive:
r = Wofi() r.select('Choose one', ['option 1', 'option 2', 'option 3'], wofi_args=['-i'])
or, to choose a different style for an instance of Wofi:
r = Wofi(wofi_args=['-theme', 'path/to/theme.rasi']) r.status('Stuff is happening, please wait...')
You need to have the wofi executable available on the system path (i.e., install Wofi!). Everything else that python-wofi needs is provided by the Python standard libraries.
What Python versions are supported?
It should work with any version of Python from 2.7 onwards. It may work with older versions, though no specific support for them will be added. It is developed on Python 2.7 and Python 3.6 – the latest versions of the Python 2 and 3 branches respectively.
What license does it use?
The MIT license, the same as python-wofi.
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