Term::Prompt

A terminal prompt for tasks that have non-deterministic time frame.

Term::Screen provides an independent prompt component for crystal-term.

Features

Number of prompt types for gathering user input
A robust API for validating complex inputs
User friendly error feedback
Intuitive DSL for creating complex menus
Ability to page long menus

Installation

Add the dependency to your shard.yml:

dependencies:
  term-prompt:
    github: crystal-term/prompt

Run shards install

Usage

In order to start asking questions, you need to first create a prompt:

require "term-prompt"

prompt = Term::Prompt.new

And then call ask with the question for a simple input:

prompt.ask("What is your name?", default: ENV["USER"])
# => What is your name? (watzon)

To ask for confirmation you can use yes? if you want the default answer to be yes, or no? if you want the default to be no. The return value will be a Bool.

prompt.yes?("Do you love Crystal?")
# Do you love Crystal? (Y/n)

If you want to hide the input from prying eyes, you can use mask:

prompt.mask("Please enter your password:")
# => Please enter your password: ••••••••••••

Asking question with list of options couldn't be easier using select like so:

prompt.select("Choose your destiny?", %w(Scorpion Kano Jax))
# =>
# Choose your destiny? (Use ↑/↓ arrow keys, press Enter to select)
# ‣ Scorpion
#   Kano
#   Jax

Also, asking multiple choice questions is a breeze with multi_select:

choices = %w(vodka beer wine whisky bourbon)
prompt.multi_select("Select drinks?", choices)
# =>
# Select drinks? (Use ↑/↓ arrow keys, press Space to select and Enter to finish)"
# ‣ ⬡ vodka
#   ⬡ beer
#   ⬡ wine
#   ⬡ whisky
#   ⬡ bourbon

To ask for a selection from enumerated list you can use enum_select:

choices = %w(emacs nano vim)
prompt.enum_select("Select an editor?", choices)
# =>
# Select an editor?
#   1) emacs
#   2) nano
#   3) vim
#   Choose 1-3 [1]:

If you wish to collect more than one answer use collect:

result = prompt.collect do |c|
  c.key(:name).ask("Name?")

  c.key(:age).ask("Age?")

  c.key(:address) do |c|
    c.key(:street).ask("Street?", required: true)
    c.key(:city).ask("City?")
    c.key(:zip).ask("Zip?", match: /\A\d{5}\Z/)
  end
end
# =>
# {:name => "Chris", :age => 27, :address => {:street => "Street", :city => "City", :zip => "12345"}}

Interface

`#ask`

In order to ask a basic question, do:

prompt.ask("What is your name?")

However the Question class is far more robust than just that, and #ask accepts all of the same options that Question.new does.

prompt.ask("What is your name?", required: true, match: /[a-z\s]+/i)

`:default`

The default option is used if the user presses the return key without entering a value:

prompt.ask("What is your name?", default: "Anonymous")
# =>
# What is your name? (Anonymous)

`:value`

To pre-populate the input line for editing use value option:

prompt.ask("What is your name?", value: "Chris")
# =>
# What is your name? Piotr

`:echo`

To control whether the input is shown back in terminal or not use echo option like so:

prompt.ask("Password:", echo: false)

`:required`

To ensure that the input is provided, use the required option:

prompt.ask("What's your phone number?", required: true)
# What's your phone number?
# >> Value is required

`:validators`

Validators allow you to ensure that an input matches a specific constraint. validators is an array of Validator objects, or procs which match Proc(Question, String?, Bool).

class NameValidator < Term::Prompt::Validator
  def call(question : Question, value : String?) : Bool
    if name = value
      names = name.split(/\s+/)
      if names.size < 2
        question.errors << "Enter your full name"
        return false
      end
    end
    true
  end
end

prompt.ask("What is your name?", required: true, validators: [NameValidator.new])

`#keypress`

In order to await a single keypress, you can use #keypress:

prompt.keypress("Press any key")
# Press any key
# => a

By default any key is accepted but you can limit keys by using :keys option. Any key event names such as Space or Ctrl + k are valid:

prompt.keypress("Press space or enter to continue", keys: [:space, :return])

`#multiline`

Asking for multiline input can be done with the multiline method. The reading will terminate with the pressing of Ctrl + d or Ctrl + z. Empty lines will not be included in the returned input.

prompt.multiline("Description?")
# Description? (Press CTRL-D or CTRL-Z to finish)
# I know not all that may be coming,
# but be it what it will,
# I'll go to it laughing.
# => "I know not all that may be coming,\n"but be it what it will,\nI'll go to it laughing.\n"

The multiline uses similar options to those supported by ask prompt. For example, to provide default description:

prompt.multiline("Description?", default: "A super sweet prompt.")

Or, using the DSL:

prompt.multiline("Description?") do |q|
  q.default = "A super sweet prompt."
  q.help = "Press thy ctrl+d to end"
end

`#mask`

f you require input of confidential information use mask method. By default each character that is printed is replaced by a • symbol. All configuration options applicable to #ask method can be used with mask as well.

prompt.mask("What is your secret?")
# => What is your secret? ••••

The masking character can be changed by passing the :mask option:

heart = prompt.decorate(prompt.symbols[:heart] + " ", :magenta)
prompt.mask("What is your secret?", mask: heart)
# => What is your secret? ❤  ❤  ❤  ❤  ❤

If you don't wish to show any output use :echo option like so:

prompt.mask("What is your secret?", echo: false)

`#yes?`/`#no?`

In order to display a query asking for boolean input from user use yes? like so:

prompt.yes?("Do you like Ruby?")
# =>
# Do you like Ruby? (Y/n)

You can further customize question by passing suffix, positive, and negative options. The suffix changes text of available options, the positive changes the display string for successful answer and negative changes the display string for a negative answer. The final value is a boolean provided the convert option evaluates to boolean.

It's enough to provide the suffix option for the prompt to accept matching answers with correct labels:

prompt.yes?("Are you a human?", suffix: "Yup/nope")
# =>
# Are you a human? (Yup/nope)

Alternatively, instead of suffix option you can provide positive and negative labels:

prompt.yes?("Are you a human?") do |q|
  q.default false
  q.positive "Yup"
  q.negative "Nope"
end
# =>
# Are you a human? (yup/Nope)

There is also the opposite for asking the confirmation of a negative question:

prompt.no?('Do you hate Crystal?')
# =>
# Do you hate Crystal? (y/N)

Similar to the #yes? method, you can supply the same options to customize the question.

menu choices

There are several ways to add choices to the below menu types. The simplest is to create an array of values:

choices = %w(small medium large)

By default the choice name is also the value the prompt will return when selected. To provide custom values, you can provide a named tuple with keys as choice names and their respective values:

choices = {small: "1", medium: "2", large: "3"}

Unfortunately for now values have to be strings.

Finally, you can define an array of choices where each choice is a hash value with :name & :value keys which can include other options for customizing individual choices:

choices = [
  {name: "small", value: "1"},
  {name: "medium", value: "2", disabled: "(out of stock)"},
  {name: "large", value: "3"}
]

You can specify :key as an additional option which will be used as short name for selecting the choice via keyboard key press.

Another way to create menu with choices is using the DSL and the choice method. For example, the previous array of choices with hash values can be translated as:

prompt.select("Which size?") do |menu|
  menu.choice name: "small",  value: "1"
  menu.choice name: "medium", value: "2", disabled: "(out of stock)"
  menu.choice name: "large",  value: "3"
end

or in a more compact way:

prompt.select("Which size?") do |menu|
  menu.choice "small",  "1"
  menu.choice "medium", "2", disabled: "(out of stock)"
  menu.choice "large",  "3"
end

`:disabled`

The :disabled key indicates that a choice is currently unavailable to select. Disabled choices are displayed with a cross ✘ character next to them. If the choice is disabled, it cannot be selected. The value for the :disabled item is used next to the choice to provide reason for excluding it from the selection menu. For example:

choices = [
  {name: 'small', value: "1"},
  {name: 'medium', value: "2", disabled: "(out of stock)"}
  {name: 'large', value: "3"}
]

`#select`

For asking questions involving list of options use the select method by passing a question and possible choices:

prompt.select("Choose your destiny?", %w(Scorpion Kano Jax))
# =>
# Choose your destiny? (Use ↑/↓ arrow keys, press Enter to select)
# ‣ Scorpion
#   Kano
#   Jax

You can also provide options through DSL using the choice method for single entry and/or choices for more than one choice:

prompt.select("Choose your destiny?") do |menu|
  menu.choice "Scorpion"
  menu.choice "Kano"
  menu.choice "Jax"
end
# =>
# Choose your destiny? (Use ↑/↓ arrow keys, press Enter to select)
# ‣ Scorpion
#   Kano
#   Jax

By default the choice name is used as return value, but you can provide custom values:

prompt.select("Choose your destiny?") do |menu|
  menu.choice "Scorpion", "1"
  menu.choice "Kano", "2"
  menu.choice "Jax", "Nice choice captain!"
end
# =>
# Choose your destiny? (Use ↑/↓ arrow keys, press Enter to select)
# ‣ Scorpion
#   Kano
#   Jax

If you wish you can also provide a simple named tuple to denote choice name and its value like so:

choices = {"Scorpion" => "1", "Kano" => "2", "Jax" => "3"}
prompt.select("Choose your destiny?", choices)

To mark particular answer as selected use default with index of the option starting from 1:

prompt.select("Choose your destiny?") do |menu|
  menu.default 3

  menu.choice "Scorpion", "1"
  menu.choice "Kano", "2"
  menu.choice "Jax", "3"
end
# =>
# Choose your destiny? (Use ↑/↓ arrow keys, press Enter to select)
#   Scorpion
#   Kano
# ‣ Jax

You can navigate the choices using the arrow keys. When reaching the top/bottom of the list, the selection does not cycle around by default. If you wish to enable cycling, you can pass cycle: true to select and multi_select:

prompt.select("Choose your destiny?", %w(Scorpion Kano Jax), cycle: true)
# =>
# Choose your destiny? (Use ↑/↓ arrow keys, press Enter to select)
# ‣ Scorpion
#   Kano
#   Jax

For ordered choices set separator to any delimiter String. In that way, you can use arrows keys and numbers (0-9) to select the item.

prompt.select("Choose your destiny?") do |menu|
  menu.separator ")"

  menu.choice "Scorpion", "1"
  menu.choice "Kano", "2"
  menu.choice "Jax", "3"
end
# =>
# Choose your destiny? (Use ↑/↓ arrow or number (0-9) keys, press Enter to select)
#   1) Scorpion
#   2) Kano
# ‣ 3) Jax

You can configure the help message and/or marker like so:

choices = %w(Scorpion Kano Jax)
prompt.select("Choose your destiny?", choices, help: "(Bash keyboard)", symbols: {marker: '>'})
# =>
# Choose your destiny? (Bash keyboard)
# > Scorpion
#   Kano
#   Jax

`:page_size`

By default the menu is paginated if selection grows beyond 6 items. To change this setting use :page_size option.

letters = ("A".."Z").to_a
prompt.select("Choose your letter?", letters, page_size: 4)
# =>
# Which letter? (Use ↑/↓ and ←/→ arrow keys, press Enter to select)
# ‣ A
#   B
#   C
#   D

You can also customize the page navigation text using :help option:

letters = ("A".."Z").to_a
prompt.select("Choose your letter?") do |menu|
  menu.page_size 4
  menu.help "(Wiggle thy finger up/down and left/right to see more)"
  menu.choices letters
end
# =>
# Which letter? (Wiggle thy finger up/down and left/right to see more)
# ‣ A
#   B
#   C
#   D

`:disabled`

To disable menu choice, use the :disabled key with a value that explains the reason for the choice being unavailable. For example, out of all warriors, Goro is currently injured:

warriors = [
  "Scorpion",
  "Kano",
  { name: "Goro", disabled: "(injured)" },
  "Jax",
  "Kitana",
  "Raiden"
]

The disabled choice will be displayed with a cross ✘ character next to it and followed by an explanation:

prompt.select("Choose your destiny?", warriors)
# =>
# Choose your destiny? (Use ↑/↓ arrow keys, press Enter to select)
# ‣ Scorpion
#   Kano
# ✘ Goro (injured)
#   Jax
#   Kitana
#   Raiden

`:filter`

To activate dynamic list searching by letter/number key presses use the :filter option:

warriors = %w(Scorpion Kano Jax Kitana Raiden)
prompt.select("Choose your destiny?", warriors, filter: true)
# =>
# Choose your destiny? (Use ↑/↓ arrow keys, press Enter to select, and letter keys to filter)
# ‣ Scorpion
#   Kano
#   Jax
#   Kitana
#   Raiden

After the user presses "k":

# =>
# Choose your destiny? (Filter: "k")
# ‣ Kano
#   Kitana

After the user presses "ka":

# =>
# Choose your destiny? (Filter: "ka")
# ‣ Kano

Filter characters can be deleted partially or entirely via Backspace and Delete respectively.

If the user changes or deletes a filter, the choices previously selected remain selected.

`#multi_select`

For asking questions involving multiple selections use the #multi_select method by passing the question and possible choices:

choices = %w(vodka beer wine whisky bourbon)
prompt.multi_select("Select drinks?", choices)
# =>
#
# Select drinks? (Use ↑/↓ arrow keys, press Space to select and Enter to finish)"
# ‣ ⬡ vodka
#   ⬡ beer
#   ⬡ wine
#   ⬡ whisky
#   ⬡ bourbon

As a return value, multi_select will always return an array populated with the names of the choices. If you wish to return custom values for the available choices do:

choices = {vodka: "1", beer: "2", wine: "3", whisky: "4", bourbon: "}
prompt.multi_select("Select drinks?", choices)

# Provided that vodka and beer have been selected, the function will return
# => ["1", "2"]

Similar to the #select method, you can also provide options through the DSL using the choice method for single entry and/or choices for more than one choice:

prompt.multi_select("Select drinks?") do |menu|
  menu.choice :vodka, "1"
  menu.choice :beer, "2"
  menu.choice :wine, "3"
  menu.choices whisky: "4", bourbon: "5"
end

To mark choice(s) as selected use the default option with index(s) of the option(s) starting from 1:

prompt.multi_select("Select drinks?") do |menu|
  menu.default 2, 5

  menu.choice :vodka,   "1"
  menu.choice :beer,    "2"
  menu.choice :wine,    "3"
  menu.choice :whisky,  "4"
  menu.choice :bourbon, "5"
end
# =>
# Select drinks? beer, bourbon
#   ⬡ vodka
#   ⬢ beer
#   ⬡ wine
#   ⬡ whisky
# ‣ ⬢ bourbon

Like select, for ordered choices set separator to any delimiter String. In that way, you can use arrows keys and the numbers (0-9) to select the item.

prompt.multi_select("Select drinks?") do |menu|
  menu.separator ")"

  menu.choice :vodka,   "1"
  menu.choice :beer,    "2"
  menu.choice :wine,    "3"
  menu.choice :whisky,  "4"
  menu.choice :bourbon, "5"
end
# =>
# Select drinks? beer, bourbon
#   ⬡ 1) vodka
#   ⬢ 2) beer
#   ⬡ 3) wine
#   ⬡ 4) whisky
# ‣ ⬢ 5) bourbon

And when you press enter you will see the following selected:

# Select drinks? beer, bourbon
# => ["2", "5"]

Also like, select, the method takes an option cycle (which defaults to false), which lets you configure whether the selection should cycle around when reaching the top/bottom of the list:

prompt.multi_select("Select drinks?", %w(vodka beer wine), cycle: true)

You can configure help message and/or marker like so

choices = {vodka: "1", beer: "2", wine: "3", whisky: "4", bourbon: "5"}
prompt.multi_select("Select drinks?", choices, help: "Press beer can against keyboard")
# =>
# Select drinks? (Press beer can against keyboard)"
# ‣ ⬡ vodka
#   ⬡ beer
#   ⬡ wine
#   ⬡ whisky
#   ⬡ bourbon

By default the menu is paginated if selection grows beyond 6 items. To change this setting use the :page_size option:

letters = ("A".."Z").to_a
prompt.multi_select("Choose your letter?", letters, page_size: 4)
# =>
# Which letter? (Use ↑/↓ and ←/→ arrow keys, press Space to select and Enter to finish)
# ‣ ⬡ A
#   ⬡ B
#   ⬡ C
#   ⬡ D

`:disabled`

To disable menu choice, use the :disabled key with a value that explains the reason for the choice being unavailable. For example, out of all drinks, the sake and beer are currently out of stock:

drinks = [ "bourbon", {name: "sake", disabled: "(out of stock)"}, "vodka", {name: "beer", disabled: "(out of stock)"}, "wine", "whisky" ]

The disabled choice will be displayed with a cross ✘ character next to it and followed by an explanation:

prompt.multi_select("Choose your favourite drink?", drinks)
# =>
# Choose your favourite drink? (Use ↑/↓ arrow keys, press Space to select and Enter to finish)
# ‣ ⬡ bourbon
#   ✘ sake (out of stock)
#   ⬡ vodka
#   ✘ beer (out of stock)
#   ⬡ wine
#   ⬡ whisky

`:echo`

To control whether the selected items are shown on the question header use the :echo option:

choices = %w(vodka beer wine whisky bourbon)
prompt.multi_select("Select drinks?", choices, echo: false)
# =>
# Select drinks?
#   ⬡ vodka
#   ⬢ 2) beer
#   ⬡ 3) wine
#   ⬡ 4) whisky
# ‣ ⬢ 5) bourbon

`:filter`

To activate dynamic list filtering on letter/number typing, use the :filter option:

choices = %w(vodka beer wine whisky bourbon)
prompt.multi_select("Select drinks?", choices, filter: true)
# =>
# Select drinks? (Use ↑/↓ arrow keys, press Space to select and Enter to finish, and letter keys to filter)
# ‣ ⬡ vodka
#   ⬡ beer
#   ⬡ wine
#   ⬡ whisky
#   ⬡ bourbon

`:filter`

To activate dynamic list filtering on letter/number typing, use the :filter option:

choices = %w(vodka beer wine whisky bourbon)
prompt.multi_select("Select drinks?", choices, filter: true)
# =>
# Select drinks? (Use ↑/↓ arrow keys, press Space to select and Enter to finish, and letter keys to filter)
# ‣ ⬡ vodka
#   ⬡ beer
#   ⬡ wine
#   ⬡ whisky
#   ⬡ bourbon

After the user presses "w":

# Select drinks? (Filter: "w")
# ‣ ⬡ wine
#   ⬡ whisky

Filter characters can be deleted partially or entirely via Backspace and Delete respectively.

If the user changes or deletes a filter, the choices previously selected remain selected.

The filter option is not compatible with :separator.

`:min`

To force the minimum number of choices an user must select, use the :min option:

choices = %w(vodka beer wine whisky bourbon)
prompt.multi_select("Select drinks?", choices, min: 3)
# =>
# Select drinks? (min. 3) vodka, beer
#   ⬢ vodka
#   ⬢ beer
#   ⬡ wine
#   ⬡ wiskey
# ‣ ⬡ bourbon

`:max`

To limit the number of choices an user can select, use the :max option:

choices = %w(vodka beer wine whisky bourbon)
prompt.multi_select("Select drinks?", choices, max: 3)
# =>
# Select drinks? (max. 3) vodka, beer, whisky
#   ⬢ vodka
#   ⬢ beer
#   ⬡ wine
#   ⬢ whisky
# ‣ ⬡ bourbon

`#enum_select`

In order to ask for standard selection from indexed list you can use #enum_select and pass question together with possible choices:

choices = %w(emacs nano vim)
prompt.enum_select("Select an editor?")
# =>
#
# Select an editor?
#   1) nano
#   2) vim
#   3) emacs
#   Choose 1-3 [1]:

Similar to select and multi_select, you can provide question options through DSL using choice method and/or choices like so:

choices = %w(nano vim emacs)
prompt.enum_select("Select an editor?") do |menu|
  menu.choice "nano",  "/bin/nano"
  menu.choice "vim",   "/usr/bin/vim"
  menu.choice "emacs", "/usr/bin/emacs"
end
# =>
#
# Select an editor?
#   1) nano
#   2) vim
#   3) emacs
#   Choose 1-3 [1]:
#
# Select an editor? /bin/nano

You can change the indexed numbers by passing separator option and the default option by using default like so

choices = %w(nano vim emacs)
prompt.enum_select("Select an editor?") do |menu|
  menu.default 2
  menu.separator "."

  menu.choice "nano",  "/bin/nano"
  menu.choice "vim",   "/usr/bin/vim"
  menu.choice "emacs", "/usr/bin/emacs"
end
# =>
#
# Select an editor?
#   1. nano
#   2. vim
#   3. emacs
#   Choose 1-3 [2]:
#
# Select an editor? /usr/bin/vim

`:page_size`

By default the menu is paginated if selection grows beyond 6 items. To change this setting use :page_size configuration.

letters = ("A".."Z").to_a
prompt.enum_select("Choose your letter?", letters, page_size: 4)
# =>
# Which letter?
#   1) A
#   2) B
#   3) C
#   4) D
#   Choose 1-26 [1]:
# (Press tab/right or left to reveal more choices)

`:disabled`

To make a choice unavailable use the :disabled option and, if you wish, provide a reason:

choices = [
  {name: "Emacs", disabled: "(not installed)"},
  "Atom",
  "GNU nano",
  {name: "Notepad++", disabled: "(not installed)"},
  "Sublime",
  "Vim"
]

The disabled choice will be displayed with a cross ✘ character next to it and followed by an explanation:

prompt.enum_select("Select an editor", choices)
# =>
# Select an editor
# ✘ 1) Emacs (not installed)
#   2) Atom
#   3) GNU nano
# ✘ 4) Notepad++ (not installed)
#   5) Sublime
#   6) Vim
#   Choose 1-6 [2]:

`#expand`

The expand method provides a compact way to ask a question with many options.

The first argument to expand is the message to display, and the second is a list of choices. As opposed to select, multi_select, and enum_select, the choices need to be NamedTuples which include the key, name, and value keys (all strings). The key must be a single character. The help choice is added automatically as the last option under the h key.

choices = [
  {
    key: "y",
    name: "overwrite this file",
    value: "yes"
  }, {
    key: "n",
    name: "do not overwrite this file",
    value: "no"
  }, {
    key: "q",
    name: "quit; do not overwrite this file ",
    value: "quit"
  }
]

The choices can also be provided through the DSL using the choice method:

prompt.expand("Overwrite shard.yml?") do |q|
  q.choice key: "y", name: "Overwrite"      value: "ok"
  q.choice key: "n", name: "Skip",          value: "no"
  q.choice key: "a", name: "Overwrite all", value: "all"
  q.choice key: "d", name: "Show diff",     value: "diff"
  q.choice key: "q", name: "Quit",          value: "quit"
end

The first element in the array of choices or provided via the choice DSL will be the default choice, you can change that by passing default option.

prompt.expand('Overwrite shard.yml?', choices, default: 1)
# =>
# Overwrite shard.yml? (enter "h" for help) [y,n,q,h]

Each time user types an option a hint will be displayed:

# Overwrite shard.yml? (enter "h" for help) [y,n,a,d,q,h] y
# >> overwrite this file

If user types h and presses enter, an expanded view will be shown which further allows to refine the choice:

# Overwrite shard.yml?
#   y - overwrite this file
#   n - do not overwrite this file
#   q - quit; do not overwrite this file
#   h - print help
#   Choice [y]:

Run examples/expand.cr to see the prompt in action.

`:auto_hint`

To show hint by default use te :auto_hint option:

prompt.expand('Overwrite Gemfile?', choices, auto_hint: true)
# =>
# Overwrite shard.yml? (enter "h" for help) [y,n,q,h]
# >> overwrite this file

`#slider`

If you have constrained range of numbers for user to choose from you may consider using a slider.

The slider provides easy visual way of picking a value marked with the ● symbol. You can set :min (defaults to 0), :max, and :step (defaults to 1) options to configure slider range:

prompt.slider("Volume", max: 100, step: 5)
# =>
# Volume ──────────●────────── 50
# (Use arrow keys, press Enter to select)

You can also change the default slider formatting using the :format. The value must contain the :slider token to show current value and any sprintf compatible flag for number display, in our case %d:

prompt.slider("Volume", max: 100, step: 5, default: 75, format: "|:slider| %d%%")
# =>
# Volume |───────────────●──────| 75%
# (Use arrow keys, press Enter to select)

As of now only whole numbers are supported.

If you wish to change the slider handle and the slider range display use :symbols option:

prompt.slider("Volume", max: 100, step: 5, default: 75, symbols: {bullet: "x", line: "_"})
# =>
# Volume _______________x______ 75%
# (Use arrow keys, press Enter to select)

Slider can be configured through a DSL as well:

prompt.slider("What size?") do |range|
  range.max 100
  range.step 5
  range.default 75
  range.format "|:slider| %d%"
end
# =>
# Volume |───────────────●──────| 75%
# (Use arrow keys, press Enter to select)

`#say`

To simply print message out to standard output use say like so:

prompt.say(...)

The say method also accepts option :color which supports all the colors provided by Cor, as well as a Cor object itself, or an {R, G, B} tuple.

Term::Prompt provides more specific versions of say method to better express intention behind the message such as ok, warn, and error.

`#ok`

To print message(s) in green do:

prompt.ok(...)

`#warn`

To print message(s) in yellow do:

prompt.warn(...)

`#error`

To print message(s) in red do:

prompt.error(...)

Settings

`:symbols`

Many prompts use symbols to display information. You can overwrite the default symbols for all the prompts using the :symbols key and hash of symbol names as value:

prompt = Term::Prompt.new(symbols: { marker: ">" })

The following symbols can be overwritten:

Symbols	Unicode	ASCII
tick	`✓`	`√`
cross	`✘`	`x`
marker	`‣`	`>`
dot	`•`	`.`
bullet	`●`	`O`
line	`─`	`-`
radio_on	`⬢`	`(*)`
radio_off	`⬡`	`( )`
arrow_up	`↑`	`↑`
arrow_down	`↓`	`↓`
arrow_left	`←`	`←`
arrow_right	`→`	`→`

`:palette`

Colors are fetched from a Palette object, which contains 4 different colors. Their names and defaults are as follows:

enabled - :dark_grey
active - :green
help - :dim_grey
error - :red
warning - :yellow

You can provide your own palette object to change the colors. For example, to change the active color to pink:

palette = Term::Prompt::Palette.new(active: :pink)
prompt = Term::Prompt.new(palette: palette)

`:interrupt`

By default InputInterrupt error will be raised when the user hits the interrupt key (Control-C). However, you can customize this behaviour by passing the :interrupt option. The available options are:

:signal - sends interrupt signal
:exit - exists with status code
:noop - skips handler

For example, to send interrupt signal do:

prompt = Term::Prompt.new(interrupt: :signal)

`:prefix`

You can prefix each question asked using the :prefix option. This option can be applied either globally for all prompts or individual for each one:

prompt = Term::Prompt.new(prefix: "[?] ")

Contributing

Fork it (https://github.com/watzon/prompt/fork)
Create your feature branch (git checkout -b my-new-feature)
Commit your changes (git commit -am 'Add some feature')
Push to the branch (git push origin my-new-feature)
Create a new Pull Request

Contributors

Chris Watson - creator and maintainer

Repository

prompt

Owner

crystal-term

Statistic

31
2
2
7
4
15 days ago
March 20, 2020

License

MIT License

Links

Synced at

Sat, 21 Dec 2024 17:46:30 GMT

Languages

Crystal 100.0%

prompt

Term::Prompt

Features

Installation

Usage

Interface

#ask

:default

:value

:echo

:required

:validators

#keypress

#multiline

#mask

#yes?/#no?

menu choices

:disabled

#select

:page_size

:disabled

:filter

#multi_select

:disabled

:echo

:filter

:filter

:min

:max

#enum_select

:page_size

:disabled

#expand

:auto_hint

#slider

#say

#ok

#warn

#error

Settings

:symbols

:palette

:interrupt

:prefix

Contributing

Contributors

`#ask`

`:default`

`:value`

`:echo`

`:required`

`:validators`

`#keypress`

`#multiline`

`#mask`

`#yes?`/`#no?`

`:disabled`

`#select`

`:page_size`

`:disabled`

`:filter`

`#multi_select`

`:disabled`

`:echo`

`:filter`

`:filter`

`:min`

`:max`

`#enum_select`

`:page_size`

`:disabled`

`#expand`

`:auto_hint`

`#slider`

`#say`

`#ok`

`#warn`

`#error`

`:symbols`

`:palette`

`:interrupt`

`:prefix`