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Simple CLI Menus

Project description

simple CLI menu

features

a simple cli menu

There is a single required argument:

  • items - a finite iterable (list, tuple, etc) of items which the user will be prompted to choose from

from pimento import menu
result = menu(['red', 'blue', 'green', 'grey'])

Prints:

Options:
  red
  blue
  green
  grey
Enter an option to continue:

You may also enter your own pre-prompt:

from pimento import menu
result = menu(
  ['red', 'blue', 'green', 'grey'],
  "Which color?"  # <--- custom pre_prompt arg
)

Prints:

Which color?
  red
  blue
  green
  grey
Enter an option to continue:

You may also enter your own post-prompt:

from pimento import menu
result = menu(
  ['red', 'blue', 'green', 'grey'],
  "which color?",
  "Please select one: "  # <--- custom post_prompt arg
)

Prints:

which color?
  red
  blue
  green
  grey

partial matches

The user can select either a full option or a partial match. All of the following will result in the user selecting blue:

  • b

  • bl

  • blu

  • blue

re-prompting

When an invalid option is entered, an actionable error message is printed, and the menu is re-prompted.

when no choice is entered:

which color?
  red
  blue
  green
  grey
Please select one:
[!] an empty response is not valid.

when an invalid choice is entered:

which color?
  red
  blue
  green
  grey
Please select one: brown
[!] "brown" does not match any of the valid choices.

when an ambiguous choice is entered:

If gre was entered…

which color?
  red
  blue
  green
  grey
Please select one: gre
[!] "gre" matches multiple choices:
[!]   green
[!]   grey
[!] Please specify your choice further.

using a default

menu will accept a default_index keyword argument. items[default_index] must be valid. An invalid index will result in an exception being raised at call time.

from pimento import menu
result = menu(
  ['red', 'blue', 'green'],
  "which color?",
  "Please select one [{}]: ",
  default_index=0
)

Prints:

which color?
  red
  blue
  green
Please select one [red]:

When a default_index is provided, it is valid to enter no value. In this case, the default value (red, in this example) is returned.

When a default_index is provided, if {} is present in the post-prompt, it will be replaced with the value of items[default_index]. It is recommended, but not required, that if you set a default_index, you should display the default value to the users via this substitution mechanism.

## using indices menu will accept an indexed argument. When set to True, indices will be printed with each option, and it will be valid to enter an index to choose an option.

from pimento import menu
result = menu(
  ['red', 'blue', 'green'],
  "which color?",
  "Please select one [{}]: ",
  default_index=0,
  indexed=True
)

Prints:

which color?
  [0] red
  [1] blue
  [2] green
Please select one [red]:

Choosing any of the following will return red:

  • <enter> (to select the default)

  • r

  • re

  • red

  • 0 (index)

When using indices, the selection is matched first by index, then by item. Given the following menu…

which number?
  [0] 100
  [1] 200
  [2] 300
Please select one:

…the selection/result pairs are:

  • 0 -> 100 (selection treated as index)

  • 1 -> 200 (selection treated as index)

  • 2 -> 300 (selection treated as index)

  • 3 -> 300 (selection matched no index, matched against items)

  • 10 -> 100 (selection matched no index, matched against items)

  • 20 -> 200 (selection matched no index, matched against items)

  • 30 -> 300 (selection matched no index, matched against items)

deduplication

If you pass multiple matching items into menu, it will deduplicate them for you. This is to prevent the following scenario:

pimento foo foo
Options:
  foo
  foo
Please select an option: foo
[!] "foo" matches multiple choices:
[!]   foo
[!]   foo
[!] Please specify your choice further.

You can’t specify a choice any further in this case, so pimento deduplicates the list for you. If you expect your list of items not to need deduplication, you should check that prior to calling menu.

case-insensitivity

menu will accept an insensitive argument, which will make the menu match user input to the menu options in a case-insensitive manner.

from pimento import menu
result = menu(
  ['RED', 'Blue', 'green'],
  insensitive=True
)

Prints:

Options:
  RED
  Blue
  green
Enter an option to continue:

Entering red will get you RED, blue will get you Blue, and GREEN will get you green.

searching

menu will accept a search argument, which will make the menu search for the user input in the whole item string, rather than just at the start:

from pimento import menu
result = menu(
  ['RED bull', 'Blue bonnet', 'green giant'],
  insensitive=True
)

Prints:

Options:
  RED bull
  Blue bonnet
  green giant
Enter an option to continue:

Entering bull will return RED bull.

CLI

There is a standalone CLI tool of the same name (pimento), which is a wrapper for pimento.menu, and can be used to create simple menus quickly on the command line:

pimento --help
usage: pimento [-h] [--pre TEXT] [--post TEXT] [--default-index INT]
               [--indexed]
               option [option ...]

Present the user with a simple CLI menu, and return the option chosen. The
menu is presented via stderr. The output is printed to stdout for piping.

positional arguments:
  option                The option(s) to present to the user.

optional arguments:
  -h, --help            show this help message and exit
  --pre TEXT, -p TEXT   The pre-prompt/title/introduction to the menu.
                        [Options:]
  --post TEXT, -P TEXT  The prompt presented to the user after the menu items.
  --default-index INT, -d INT
                        The index of the item to use as the default
  --indexed, -i         Print indices with the options, and allow the user to
                        use them to choose.
  --insensitive, -I     Perform insensitive matching. Also drops any items
                        that case-insensitively match prior items.
  --search, -s          search for the user input anywhere in the item
                        strings, not just at the beginning.


The default for the post prompt is "Enter an option to continue: ". If
--default-index is specified, the default option value will be printed in the
post prompt as well.

installation

Latest pushed to Pypi (v0.5.2)

pip install pimento

Latest

pip install git+https://github.com/toejough/pimento

testing

pimento has been tested on python 2.7.9 and 3.4.3 on OSX. To test yourself:

git clone https://github.com/toejough/pimento
cd pimento
pip install tox
tox

API deprecation notice

Prior to version v0.4.0, the signature for menu was:

def menu(pre_prompt, items, post_prompt=DEFAULT, default_index=None, indexed=False):

In v0.4.0, the signature changed to:

def menu(items, pre_prompt=DEFAULT, post_prompt=DEFAULT, default_index=None, indexed=False):

To ease transition of any users, there is special code in place to determine which order the caller is passing in items and pre_prompt. All pre-0.4.0 code should continue to work, but passing pre_prompt as the first argument is a deprecated use and should be discontinued. Old code should be updated. The compatibility mode will be discontinued soon, but definitely by 1.0.0.

The API was changed to allow the simplest possible calling/use of the menu function. The original signature was chosen because I thought that there wasn’t a sensible default value, but “Options:” seems sensible enough for a generic default.

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