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#
#
# The MIT License
#
# Copyright (c) 2016, 2017 Blair Bonnett <blair.bonnett@gmail.com>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
#
import atexit
import signal
import subprocess
import time
from datetime import datetime
from decimal import Decimal, InvalidOperation
# Python < 3.2 doesn't provide a context manager interface for Popen.
# Let's make our own wrapper if needed.
if hasattr(subprocess.Popen, "__exit__"):
Popen = subprocess.Popen
else:
class ContextManagedPopen(subprocess.Popen):
def __enter__(self):
return self
def __exit__(self, type, value, traceback):
if self.stdout:
self.stdout.close()
if self.stderr:
self.stderr.close()
if self.stdin:
self.stdin.close()
self.wait()
Popen = ContextManagedPopen
class Rofi(object):
"""Class to facilitate making simple GUIs with Rofi.
Rofi is a popup window system with minimal dependencies (xlib and pango).
It was designed as a window switcher. Its basic operation is to display a
list of options and let the user pick one.
This class provides a set of methods to make simple GUIs with Rofi. It does
this by using the subprocess module to call Rofi externally. Many of the
methods are blocking.
Some strings can contain Pango markup for additional formatting (those that
can are noted as such in the docstrings). Any text in these strings *must*
be escaped before calling Rofi. The class method Rofi.escape() performs
this escaping for you. Make sure you call this on the text prior to adding
Pango markup, otherwise the markup will be escaped and displayed to the
user. See https://developer.gnome.org/pango/stable/PangoMarkupFormat.html
for available markup.
"""
def __init__(
self,
lines=None,
fixed_lines=None,
width=None,
fullscreen=None,
location=None,
exit_hotkeys=("Alt+F4", "Control+q"),
rofi_args=None,
theme_str=None,
config_file=None,
active=None,
insensitive=False,
):
"""
Parameters
----------
exit_hotkeys: tuple of strings
Hotkeys to use to exit the application. These will be automatically
set and handled in any method which takes hotkey arguments. If one
of these hotkeys is pressed, a SystemExit will be raised to perform
the exit.
The following parameters set default values for various layout options,
and can be overwritten in any display method. A value of None means
use the system default, which may be set by a configuration file or
fall back to the compile-time default. See the Rofi documentation for
full details on what the values mean.
lines: positive integer
The maximum number of lines to show before scrolling.
fixed_lines: positive integer
Keep a fixed number of lines visible.
width: real
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 ~30 characters per row would show.
fullscreen: boolean
If True, use the full height and width of the screen.
location: integer
The position of the window on the screen.
rofi_args: list
A list of other arguments to pass in to every call to rofi. These get appended
after any other arguments
"""
# The Popen class returned for any non-blocking windows.
self._process = None
# Save parameters.
self.theme_str = theme_str
self.config_file = config_file
self.insensitive = insensitive
self.lines = lines
self.fixed_lines = fixed_lines
self.width = width
self.fullscreen = fullscreen
self.location = location
self.exit_hotkeys = exit_hotkeys
self.active = active
self.rofi_args = rofi_args or []
# Don't want a window left on the screen if we exit unexpectedly
# (e.g., an unhandled exception).
atexit.register(self.close)
@classmethod
def escape(self, string):
"""Escape a string for Pango markup.
Parameters
----------
string:
A piece of text to escape.
Returns
-------
The text, safe for use in with Pango markup.
"""
# Escape ampersands first, then other entities. Since argument is a
# dictionary, we can't guarantee order of translations and so doing it
# in one go would risk the ampersands in other translations being
# escaped again.
return string.translate({38: "&amp;"}).translate(
{34: "&quot;", 39: "&apos;", 60: "&lt;", 62: "&gt;"}
)
def close(self):
"""Close any open window.
Note that this only works with non-blocking methods.
"""
if self._process:
# Be nice first.
self._process.send_signal(signal.SIGINT)
# If it doesn't close itself promptly, be brutal.
# Python 3.2+ added the timeout option to wait() and the
# corresponding TimeoutExpired exception. If they exist, use them.
if hasattr(subprocess, "TimeoutExpired"):
try:
self._process.wait(timeout=1)
except subprocess.TimeoutExpired:
self._process.send_signal(signal.SIGKILL)
# Otherwise, roll our own polling loop.
else:
# Give it 1s, checking every 10ms.
count = 0
while count < 100:
if self._process.poll() is not None:
break
time.sleep(0.01)
# Still hasn't quit.
if self._process.poll() is None:
self._process.send_signal(signal.SIGKILL)
# Clean up.
self._process = None
def _run_blocking(self, args, input=None):
"""Internal API: run a blocking command with subprocess.
This closes any open non-blocking dialog before running the command.
Parameters
----------
args: Popen constructor arguments
Command to run.
input: string
Value to feed to the stdin of the process.
Returns
-------
(returncode, stdout)
The exit code (integer) and stdout value (string) from the process.
"""
# Close any existing dialog.
if self._process:
self.close()
# Make sure we grab stdout as text (not bytes).
kwargs = {}
kwargs["stdout"] = subprocess.PIPE
kwargs["universal_newlines"] = True
# Use the run() method if available (Python 3.5+).
if hasattr(subprocess, "run"):
result = subprocess.run(args, input=input, **kwargs)
return result.returncode, result.stdout
# Have to do our own. If we need to feed stdin, we must open a pipe.
if input is not None:
kwargs["stdin"] = subprocess.PIPE
# Start the process.
with Popen(args, **kwargs) as proc:
# Talk to it (no timeout). This will wait until termination.
stdout, stderr = proc.communicate(input)
# Find out the return code.
returncode = proc.poll()
# Done.
return returncode, stdout
def _run_nonblocking(self, args, input=None):
"""Internal API: run a non-blocking command with subprocess.
This closes any open non-blocking dialog before running the command.
Parameters
----------
args: Popen constructor arguments
Command to run.
input: string
Value to feed to the stdin of the process.
"""
# Close any existing dialog.
if self._process:
self.close()
# Start the new one.
self._process = subprocess.Popen(args, stdout=subprocess.PIPE)
def _common_args(self, allow_fullscreen=True, **kwargs):
args = []
if self.theme_str:
theme_str = kwargs.get("theme", self.theme_str)
args.extend(["-theme-str", str(theme_str)])
# config file
if self.config_file:
from pathlib import Path
config_file = Path(kwargs.get("config_file", self.config_file))
if (
not config_file.expanduser().exists()
or config_file.expanduser().is_dir()
):
raise ValueError(
f"config_file {str(config_file)} is not a valid file or does not exist"
)
args.extend(["-config", str(config_file.expanduser())])
# case insensitivity
insensitive = kwargs.get("insensitive", self.insensitive)
if insensitive:
args.append("-i")
# Number of lines.
lines = kwargs.get("lines", self.lines)
if lines:
args.extend(["-l", str(lines)])
fixed_lines = kwargs.get("fixed_lines", self.fixed_lines)
if fixed_lines:
args.extend(["-fixed-num-lines", str(fixed_lines)])
# Width.
width = kwargs.get("width", self.width)
if width is not None:
args.extend(["-theme-str", f"window {{ width: {width}; }}"])
# Fullscreen mode?
fullscreen = kwargs.get("fullscreen", self.fullscreen)
if allow_fullscreen and fullscreen:
args.append("-fullscreen")
# Location on screen.
location = kwargs.get("location", self.location)
if location is not None:
args.extend(["-location", str(location)])
# Any other arguments
args.extend(self.rofi_args)
# Done.
return args
def error(self, message, rofi_args=None, **kwargs):
"""Show an error window.
This method blocks until the user presses a key.
Fullscreen mode is not supported for error windows, and if specified
will be ignored.
Parameters
----------
message: string
Error message to show.
"""
rofi_args = rofi_args or []
# Generate arguments list.
args = ["rofi", "-e", message]
args.extend(self._common_args(allow_fullscreen=False, **kwargs))
args.extend(rofi_args)
# Close any existing window and show the error.
self._run_blocking(args)
def status(self, message, rofi_args=None, **kwargs):
"""Show a status message.
This method is non-blocking, and intended to give a status update to
the user while something is happening in the background.
To close the window, either call the close() method or use any of the
display methods to replace it with a different window.
Fullscreen mode is not supported for status messages and if specified
will be ignored.
Parameters
----------
message: string
Progress message to show.
"""
rofi_args = rofi_args or []
# Generate arguments list.
args = ["rofi", "-e", message]
args.extend(self._common_args(allow_fullscreen=False, **kwargs))
args.extend(rofi_args)
# Update the status.
self._run_nonblocking(args)
def select(
self, prompt, options, rofi_args=None, message="", select=None, **kwargs
):
"""Show a list of options and return user selection.
This method blocks until the user makes their choice.
Parameters
----------
prompt: string
The prompt telling the user what they are selecting.
options: list of strings
The options they can choose from. Any newline characters are
replaced with spaces.
message: string, optional
Message to show between the prompt and the options. This can
contain Pango markup, and any text content should be escaped.
select: integer, optional
Set which option is initially selected.
keyN: tuple (string, string); optional
Custom key bindings where N is one or greater. The first entry in
the tuple should be a string defining the key, e.g., "Alt+x" or
"Delete". Note that letter keys should be lowercase ie.e., Alt+a
not Alt+A.
The second entry should be a short string stating the action the
key will take. This is displayed to the user at the top of the
dialog. If None or an empty string, it is not displayed (but the
binding is still set).
By default, key1 through key9 are set to ("Alt+1", None) through
("Alt+9", None) respectively.
Returns
-------
tuple (index, key)
The index of the option the user selected, or -1 if they cancelled
the dialog.
Key indicates which key was pressed, with 0 being 'OK' (generally
Enter), -1 being 'Cancel' (generally escape), and N being custom
key N.
"""
rofi_args = rofi_args or []
# Replace newlines and turn the options into a single string.
optionstr = "\n".join(option.replace("\n", " ") for option in options)
# Set up arguments.
args = ["rofi", "-dmenu", "-p", prompt, "-format", "i"]
if select is not None:
args.extend(["-selected-row", str(select)])
# Key bindings to display.
display_bindings = []
# Configure the key bindings.
user_keys = set()
for k, v in kwargs.items():
# See if the keyword name matches the needed format.
if not k.startswith("key"):
continue
try:
keynum = int(k[3:])
except ValueError:
continue
# Add it to the set.
key, action = v
user_keys.add(keynum)
args.extend(["-kb-custom-{0:s}".format(k[3:]), key])
if action:
display_bindings.append("<b>{0:s}</b>: {1:s}".format(key, action))
# And the global exit bindings.
exit_keys = set()
next_key = 10
for key in self.exit_hotkeys:
while next_key in user_keys:
next_key += 1
exit_keys.add(next_key)
args.extend(["-kb-custom-{0:d}".format(next_key), key])
next_key += 1
# Add any displayed key bindings to the message.
message = message or ""
if display_bindings:
message += "\n" + " ".join(display_bindings)
message = message.strip()
# If we have a message, add it to the arguments.
if message:
args.extend(["-mesg", message])
# Add in common arguments.
args.extend(self._common_args(**kwargs))
args.extend(rofi_args)
# Run the dialog.
returncode, stdout = self._run_blocking(args, input=optionstr)
# Figure out which option was selected.
stdout = stdout.strip()
index = int(stdout) if stdout else -1
# And map the return code to a key.
if returncode == 0:
key = 0
elif returncode == 1:
key = -1
elif returncode > 9:
key = returncode - 9
if key in exit_keys:
raise SystemExit()
else:
self.exit_with_error(
"Unexpected rofi returncode {0:d}.".format(results.returncode)
)
# And return.
return index, key
def generic_entry(
self, prompt, validator=None, message=None, rofi_args=None, **kwargs
):
"""A generic entry box.
Parameters
----------
prompt: string
Text prompt for the entry.
validator: function, optional
A function to validate and convert the value entered by the user.
It should take one parameter, the string that the user entered, and
return a tuple (value, error). The value should be the users entry
converted to the appropriate Python type, or None if the entry was
invalid. The error message should be a string telling the user what
was wrong, or None if the entry was valid. The prompt will be
re-displayed to the user (along with the error message) until they
enter a valid value. If no validator is given, the text that the
user entered is returned as-is.
message: string
Optional message to display under the entry.
Returns
-------
The value returned by the validator, or None if the dialog was
cancelled.
Examples
--------
Enforce a minimum entry length:
>>> r = Rofi()
>>> validator = lambda s: (s, None) if len(s) > 6 else (None, "Too short")
>>> r.generic_entry('Enter a 7-character or longer string: ', validator)
"""
error = ""
rofi_args = rofi_args or []
# Keep going until we get something valid.
while True:
args = ["rofi", "-dmenu", "-p", prompt, "-format", "s"]
# Add any error to the given message.
msg = message or ""
if error:
msg = '<span color="#FF0000" font_weight="bold">{0:s}</span>\n{1:s}'.format(
error, msg
)
msg = msg.rstrip("\n")
# If there is actually a message to show.
if msg:
args.extend(["-mesg", msg])
# Add in common arguments.
args.extend(self._common_args(**kwargs))
args.extend(rofi_args)
# Run it.
returncode, stdout = self._run_blocking(args, input="")
# Was the dialog cancelled?
if returncode != 0:
return None
# Get rid of the trailing newline and check its validity.
text = stdout.rstrip("\n")
if validator:
value, error = validator(text)
if not error:
return value
else:
return text
def text_entry(
self,
prompt,
message=None,
allow_blank=False,
strip=True,
rofi_args=None,
**kwargs,
):
"""Prompt the user to enter a piece of text.
Parameters
----------
prompt: string
Prompt to display to the user.
message: string, optional
Message to display under the entry line.
allow_blank: Boolean
Whether to allow blank entries.
strip: Boolean
Whether to strip leading and trailing whitespace from the entered
value.
Returns
-------
string, or None if the dialog was cancelled.
"""
def text_validator(text):
if strip:
text = text.strip()
if not allow_blank:
if not text:
return None, "A value is required."
return text, None
return self.generic_entry(prompt, text_validator, message, rofi_args, **kwargs)
def integer_entry(
self, prompt, message=None, min=None, max=None, rofi_args=None, **kwargs
):
"""Prompt the user to enter an integer.
Parameters
----------
prompt: string
Prompt to display to the user.
message: string, optional
Message to display under the entry line.
min, max: integer, optional
Minimum and maximum values to allow. If None, no limit is imposed.
Returns
-------
integer, or None if the dialog is cancelled.
"""
# Sanity check.
if (min is not None) and (max is not None) and not (max > min):
raise ValueError("Maximum limit has to be more than the minimum limit.")
def integer_validator(text):
error = None
# Attempt to convert to integer.
try:
value = int(text)
except ValueError:
return None, "Please enter an integer value."
# Check its within limits.
if (min is not None) and (value < min):
return None, "The minimum allowable value is {0:d}.".format(min)
if (max is not None) and (value > max):
return None, "The maximum allowable value is {0:d}.".format(max)
return value, None
return self.generic_entry(
prompt, integer_validator, message, rofi_args, **kwargs
)
def float_entry(
self, prompt, message=None, min=None, max=None, rofi_args=None, **kwargs
):
"""Prompt the user to enter a floating point number.
Parameters
----------
prompt: string
Prompt to display to the user.
message: string, optional
Message to display under the entry line.
min, max: float, optional
Minimum and maximum values to allow. If None, no limit is imposed.
Returns
-------
float, or None if the dialog is cancelled.
"""
# Sanity check.
if (min is not None) and (max is not None) and not (max > min):
raise ValueError("Maximum limit has to be more than the minimum limit.")
def float_validator(text):
error = None
# Attempt to convert to float.
try:
value = float(text)
except ValueError:
return None, "Please enter a floating point value."
# Check its within limits.
if (min is not None) and (value < min):
return None, "The minimum allowable value is {0}.".format(min)
if (max is not None) and (value > max):
return None, "The maximum allowable value is {0}.".format(max)
return value, None
return self.generic_entry(prompt, float_validator, message, rofi_args, **kwargs)
def decimal_entry(
self, prompt, message=None, min=None, max=None, rofi_args=None, **kwargs
):
"""Prompt the user to enter a decimal number.
Parameters
----------
prompt: string
Prompt to display to the user.
message: string, optional
Message to display under the entry line.
min, max: Decimal, optional
Minimum and maximum values to allow. If None, no limit is imposed.
Returns
-------
Decimal, or None if the dialog is cancelled.
"""
# Sanity check.
if (min is not None) and (max is not None) and not (max > min):
raise ValueError("Maximum limit has to be more than the minimum limit.")
def decimal_validator(text):
error = None
# Attempt to convert to decimal.
try:
value = Decimal(text)
except InvalidOperation:
return None, "Please enter a decimal value."
# Check its within limits.
if (min is not None) and (value < min):
return None, "The minimum allowable value is {0}.".format(min)
if (max is not None) and (value > max):
return None, "The maximum allowable value is {0}.".format(max)
return value, None
return self.generic_entry(
prompt, decimal_validator, message, rofi_args, **kwargs
)
def date_entry(
self,
prompt,
message=None,
formats=["%x", "%d/%m/%Y"],
show_example=False,
rofi_args=None,
**kwargs,
):
"""Prompt the user to enter a date.
Parameters
----------
prompt: string
Prompt to display to the user.
message: string, optional
Message to display under the entry line.
formats: list of strings, optional
The formats that the user can enter dates in. These should be
format strings as accepted by the datetime.datetime.strptime()
function from the standard library. They are tried in order, and
the first that returns a date object without error is selected.
Note that the '%x' in the default list is the current locale's date
representation.
show_example: Boolean
If True, today's date in the first format given is appended to the
message.
Returns
-------
datetime.date, or None if the dialog is cancelled.
"""
def date_validator(text):
# Try them in order.
for format in formats:
try:
dt = datetime.strptime(text, format)
except ValueError:
continue
else:
# This one worked; good enough for us.
return (dt.date(), None)
# None of the formats worked.
return (None, "Please enter a valid date.")
# Add an example to the message?
if show_example:
message = message or ""
message += "Today's date in the correct format: " + datetime.now().strftime(
formats[0]
)
return self.generic_entry(prompt, date_validator, message, rofi_args, **kwargs)
def time_entry(
self,
prompt,
message=None,
formats=["%X", "%H:%M", "%I:%M", "%H.%M", "%I.%M"],
show_example=False,
rofi_args=None,
**kwargs,
):
"""Prompt the user to enter a time.
Parameters
----------
prompt: string
Prompt to display to the user.
message: string, optional
Message to display under the entry line.
formats: list of strings, optional
The formats that the user can enter times in. These should be
format strings as accepted by the datetime.datetime.strptime()
function from the standard library. They are tried in order, and
the first that returns a time object without error is selected.
Note that the '%X' in the default list is the current locale's time
representation.
show_example: Boolean
If True, the current time in the first format given is appended to
the message.
Returns
-------
datetime.time, or None if the dialog is cancelled.
"""
def time_validator(text):
# Try them in order.
for format in formats:
try:
dt = datetime.strptime(text, format)
except ValueError:
continue
else:
# This one worked; good enough for us.
return (dt.time(), None)
# None of the formats worked.
return (None, "Please enter a valid time.")
# Add an example to the message?
if show_example:
message = message or ""
message += "Current time in the correct format: " + datetime.now().strftime(
formats[0]
)
return self.generic_entry(
prompt, time_validator, message, rofi_args=None, **kwargs
)
def datetime_entry(
self,
prompt,
message=None,
formats=["%x %X"],
show_example=False,
rofi_args=None,
**kwargs,
):
"""Prompt the user to enter a date and time.
Parameters
----------
prompt: string
Prompt to display to the user.
message: string, optional
Message to display under the entry line.
formats: list of strings, optional
The formats that the user can enter the date and time in. These
should be format strings as accepted by the
datetime.datetime.strptime() function from the standard library.
They are tried in order, and the first that returns a datetime
object without error is selected. Note that the '%x %X' in the
default list is the current locale's date and time representation.
show_example: Boolean
If True, the current date and time in the first format given is appended to
the message.
Returns
-------
datetime.datetime, or None if the dialog is cancelled.
"""
def datetime_validator(text):
# Try them in order.
for format in formats:
try:
dt = datetime.strptime(text, format)
except ValueError:
continue
else:
# This one worked; good enough for us.
return (dt, None)
# None of the formats worked.
return (None, "Please enter a valid date and time.")
# Add an example to the message?
if show_example:
message = message or ""
message += (
"Current date and time in the correct format: "
+ datetime.now().strftime(formats[0])
)
return self.generic_entry(
prompt, datetime_validator, message, rofi_args, **kwargs
)
def exit_with_error(self, error, **kwargs):
"""Report an error and exit.
This raises a SystemExit exception to ask the interpreter to quit.
Parameters
----------
error: string
The error to report before quitting.
"""
self.error(error, **kwargs)
raise SystemExit(error)
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