Struct inquire::CustomType
source · pub struct CustomType<'a, T> {
pub message: &'a str,
pub starting_input: Option<&'a str>,
pub default: Option<T>,
pub placeholder: Option<&'a str>,
pub help_message: Option<&'a str>,
pub formatter: CustomTypeFormatter<'a, T>,
pub default_value_formatter: CustomTypeFormatter<'a, T>,
pub parser: CustomTypeParser<'a, T>,
pub validators: Vec<Box<dyn CustomTypeValidator<T>>>,
pub error_message: String,
pub render_config: RenderConfig<'a>,
}
Expand description
Generic prompt suitable for when you need to parse the user input into a specific type, for example an f64
or a rust_decimal
, maybe even an uuid
.
This prompt has all of the validation, parsing and error handling features built-in to reduce as much boilerplaste as possible from your prompts. Its defaults are necessarily very simple in order to cover a large range of generic cases, for example a “Invalid input” error message.
You can customize as many aspects of this prompt as you like: prompt message, help message, default value, placeholder, value parser and value formatter.
§Behavior
When initializing this prompt via the new()
method, some constraints on the return type T
are added to make sure we can apply a default parser and formatter to the prompt.
The default parser calls the str.parse
method, which means that T
must implement the FromStr
trait. When the parsing fails for any reason, a default error message “Invalid input” is displayed to the user.
After the user submits, the prompt handler tries to parse the input into the expected type. If the operation succeeds, the value is returned to the prompt caller. If it fails, the message defined in error_message
is displayed to the user.
The default formatter simply calls to_string()
on the parsed value, which means that T
must implement the ToString
trait, which normally happens implicitly when you implement the Display
trait.
If your type T
does not satisfy these constraints, you can always manually instantiate the entire struct yourself like this:
use inquire::{CustomType, ui::RenderConfig};
let amount_prompt: CustomType<f64> = CustomType {
message: "How much is your travel going to cost?",
starting_input: None,
formatter: &|i| format!("${:.2}", i),
default_value_formatter: &|i| format!("${:.2}", i),
default: None,
validators: vec![],
placeholder: Some("123.45"),
error_message: "Please type a valid number.".into(),
help_message: "Do not use currency and the number should use dots as the decimal separator.".into(),
parser: &|i| match i.parse::<f64>() {
Ok(val) => Ok(val),
Err(_) => Err(()),
},
render_config: RenderConfig::default(),
};
§Example
use inquire::CustomType;
let amount = CustomType::<f64>::new("How much do you want to donate?")
.with_formatter(&|i| format!("${:.2}", i))
.with_error_message("Please type a valid number")
.with_help_message("Type the amount in US dollars using a decimal point as a separator")
.prompt();
match amount {
Ok(_) => println!("Thanks a lot for donating that much money!"),
Err(_) => println!("We could not process your donation"),
}
Fields§
§message: &'a str
Message to be presented to the user.
starting_input: Option<&'a str>
Initial value of the prompt’s text input.
If you want to set a default value for the prompt, returned when the user’s submission is empty, see default
.
default: Option<T>
Default value, returned when the user input is empty.
placeholder: Option<&'a str>
Short hint that describes the expected value of the input.
help_message: Option<&'a str>
Help message to be presented to the user.
formatter: CustomTypeFormatter<'a, T>
Function that formats the user input and presents it to the user as the final rendering of the prompt.
default_value_formatter: CustomTypeFormatter<'a, T>
Function that formats the provided value. Useful for example when you want to format a default true
to the string “Y/n”, common in confirmation prompts.
parser: CustomTypeParser<'a, T>
Function that parses the user input and returns the result value.
validators: Vec<Box<dyn CustomTypeValidator<T>>>
Collection of validators to apply to the user input.
Validators are executed in the order they are stored, stopping at and displaying to the user only the first validation error that might appear.
The possible error is displayed to the user one line above the prompt.
error_message: String
Error message displayed when value could not be parsed from input.
render_config: RenderConfig<'a>
RenderConfig to apply to the rendered interface.
Note: The default render config considers if the NO_COLOR environment variable is set to decide whether to render the colored config or the empty one.
When overriding the config in a prompt, NO_COLOR is no longer considered and your config is treated as the only source of truth. If you want to customize colors and still support NO_COLOR, you will have to do this on your end.
Implementations§
source§impl<'a, T> CustomType<'a, T>where
T: Clone,
impl<'a, T> CustomType<'a, T>where
T: Clone,
sourcepub const DEFAULT_VALIDATORS: Vec<Box<dyn CustomTypeValidator<T>>> = _
pub const DEFAULT_VALIDATORS: Vec<Box<dyn CustomTypeValidator<T>>> = _
Default validators added to the CustomType prompt, none.
sourcepub fn new(message: &'a str) -> Self
pub fn new(message: &'a str) -> Self
Creates a CustomType with the provided message and default configuration values.
sourcepub fn with_starting_input(self, message: &'a str) -> Self
pub fn with_starting_input(self, message: &'a str) -> Self
Sets the initial value of the prompt’s text input.
If you want to set a default value for the prompt, returned when the user’s submission is empty, see with_default
.
sourcepub fn with_default(self, default: T) -> Self
pub fn with_default(self, default: T) -> Self
Sets the default input.
sourcepub fn with_placeholder(self, placeholder: &'a str) -> Self
pub fn with_placeholder(self, placeholder: &'a str) -> Self
Sets the placeholder.
sourcepub fn with_help_message(self, message: &'a str) -> Self
pub fn with_help_message(self, message: &'a str) -> Self
Sets the help message of the prompt.
sourcepub fn with_formatter(self, formatter: CustomTypeFormatter<'a, T>) -> Self
pub fn with_formatter(self, formatter: CustomTypeFormatter<'a, T>) -> Self
Sets the formatter
sourcepub fn with_default_value_formatter(
self,
formatter: CustomTypeFormatter<'a, T>
) -> Self
pub fn with_default_value_formatter( self, formatter: CustomTypeFormatter<'a, T> ) -> Self
Sets the formatter for default values.
Useful for example when you want to format a default true
to the string “Y/n”, common in confirmation prompts,
when the final answer would be displayed likely as “Yes” or “No”.
sourcepub fn with_parser(self, parser: CustomTypeParser<'a, T>) -> Self
pub fn with_parser(self, parser: CustomTypeParser<'a, T>) -> Self
Sets the parser.
sourcepub fn with_validator<V>(self, validator: V) -> Selfwhere
V: CustomTypeValidator<T> + 'static,
pub fn with_validator<V>(self, validator: V) -> Selfwhere
V: CustomTypeValidator<T> + 'static,
Adds a validator to the collection of validators. You might want to use this feature in case you need to require certain features from the parsed user’s answer.
Validators are executed in the order they are stored, stopping at and displaying to the user only the first validation error that might appear.
The possible error is displayed to the user one line above the prompt.
sourcepub fn with_validators(
self,
validators: &[Box<dyn CustomTypeValidator<T>>]
) -> Self
pub fn with_validators( self, validators: &[Box<dyn CustomTypeValidator<T>>] ) -> Self
Adds the validators to the collection of validators in the order they are given. You might want to use this feature in case you need to require certain features from the parsed user’s answer.
Validators are executed in the order they are stored, stopping at and displaying to the user only the first validation error that might appear.
The possible error is displayed to the user one line above the prompt.
sourcepub fn with_error_message(self, error_message: &'a str) -> Self
pub fn with_error_message(self, error_message: &'a str) -> Self
Sets a custom error message displayed when a submission could not be parsed to a value.
sourcepub fn with_render_config(self, render_config: RenderConfig<'a>) -> Self
pub fn with_render_config(self, render_config: RenderConfig<'a>) -> Self
Sets the provided color theme to this prompt.
Note: The default render config considers if the NO_COLOR environment variable is set to decide whether to render the colored config or the empty one.
When overriding the config in a prompt, NO_COLOR is no longer considered and your config is treated as the only source of truth. If you want to customize colors and still support NO_COLOR, you will have to do this on your end.
sourcepub fn prompt_skippable(self) -> InquireResult<Option<T>>
pub fn prompt_skippable(self) -> InquireResult<Option<T>>
Parses the provided behavioral and rendering options and prompts the CLI user for input according to the defined rules.
This method is intended for flows where the user skipping/cancelling
the prompt - by pressing ESC - is considered normal behavior. In this case,
it does not return Err(InquireError::OperationCanceled)
, but Ok(None)
.
Meanwhile, if the user does submit an answer, the method wraps the return
type with Some
.
sourcepub fn prompt(self) -> InquireResult<T>
pub fn prompt(self) -> InquireResult<T>
Parses the provided behavioral and rendering options and prompts the CLI user for input according to the defined rules.
Trait Implementations§
source§impl<'a, T: Clone> Clone for CustomType<'a, T>
impl<'a, T: Clone> Clone for CustomType<'a, T>
source§fn clone(&self) -> CustomType<'a, T>
fn clone(&self) -> CustomType<'a, T>
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read more