revel 0.9.0

Effortlessly spice up your terminal apps using colors, progressbars & more

Revel

revel helps you create beautiful interfaces for your command line tools. Best of all, it's extremely easy to use.

Simply replace the standard print function with revel's and just like that you can now display colors!

from revel import print

print('[green]Hello, World![/]')

Styles

revel uses BBCode-style markup to style your text. A variety of styles are available:

• Formatting:

  • bold
  • dim
  • italic
  • underlined
  • inverted
  • strikethrough

• Text Colors:

  • black
  • red
  • green
  • blue
  • magenta
  • cyan
  • white

• Background Colors:

  • bg-black
  • bg-red
  • bg-green
  • bg-blue
  • bg-magenta
  • bg-cyan
  • bg-white

Adding weak to a tag will only apply the styles of that tag, if no competing styles are already applied. For example:

print("[red]Hello, [weak blue underlined]World![/][/]")

This will be displayed entirely in red (since the weak "blue" formatting is overridden by "red"), but the "underlined" formatting will still be applied.

Progressbars

Adding progressbars is easy as can be:

from revel import print, ProgressBar
import time

with ProgressBar(max=10, unit="percent") as bar:
    for ii in range(10):
        bar.progress = ii
        time.sleep(1.0)

You can switch units between "count", "percent", "byte" and "time". The bar will also automatically display how much time remains until completion, once it is confident in its estimate.

Edit text after it has already been printed

Docked widgets can be edited at will. For example, this example docks a text line and updates it repeatedly:

from revel import print
import time

line = print("Looking for files", dock=True)

for ii in range(1, 10):
    line.text = f"Found {ii} file(s)"
    time.sleep(1.0)

Additional print-like methods

In addition to print, revel also provides success, warning, error and fatal. These will be displayed in color, drawing attention to the message.

TODO

• Implement the verbatim tag
• Jupyter Notebook support
• Test on bad terminals
• Actual docs
• Showcase features:
  • print_chapter
  • select
  • select_multiple
  • select_short
    • select_yes_no
  • input_key
  • input
    • general improvements, such as parsing, default
    • secret input
  • escape
  • unescape