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Custom validator and prompt code examples (#500)
* custom validator and prompt * Split prompt and validator demo into two files Also add info text when running Co-authored-by: sholderbach <sholderbach@users.noreply.github.com>
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examples/custom_prompt.rs
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75
examples/custom_prompt.rs
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// Create a reedline object with a custom prompt.
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// cargo run --example custom_prompt
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//
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// Pressing keys will increase the right prompt value
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use reedline::{
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Prompt, PromptEditMode, PromptHistorySearch, PromptHistorySearchStatus, Reedline, Signal,
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};
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use std::{borrow::Cow, cell::Cell, io};
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// For custom prompt, implement the Prompt trait
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//
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// This example displays the number of keystrokes
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// or rather increments each time the prompt is rendered.
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#[derive(Clone)]
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pub struct CustomPrompt(Cell<u32>, &'static str);
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pub static DEFAULT_MULTILINE_INDICATOR: &str = "::: ";
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impl Prompt for CustomPrompt {
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fn render_prompt_left(&self) -> Cow<str> {
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{
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Cow::Owned(self.1.to_string())
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}
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}
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fn render_prompt_right(&self) -> Cow<str> {
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{
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let old = self.0.get();
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self.0.set(old + 1);
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Cow::Owned(format!("[{}]", old))
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}
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}
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fn render_prompt_indicator(&self, _edit_mode: PromptEditMode) -> Cow<str> {
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Cow::Owned(">".to_string())
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}
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fn render_prompt_multiline_indicator(&self) -> Cow<str> {
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Cow::Borrowed(DEFAULT_MULTILINE_INDICATOR)
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}
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fn render_prompt_history_search_indicator(
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&self,
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history_search: PromptHistorySearch,
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) -> Cow<str> {
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let prefix = match history_search.status {
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PromptHistorySearchStatus::Passing => "",
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PromptHistorySearchStatus::Failing => "failing ",
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};
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Cow::Owned(format!(
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"({}reverse-search: {}) ",
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prefix, history_search.term
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))
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}
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}
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fn main() -> io::Result<()> {
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println!("Custom prompt demo:\nAbort with Ctrl-C or Ctrl-D");
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let mut line_editor = Reedline::create();
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let prompt = CustomPrompt(Cell::new(0), "Custom Prompt");
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loop {
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let sig = line_editor.read_line(&prompt)?;
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match sig {
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Signal::Success(buffer) => {
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println!("We processed: {}", buffer);
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}
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Signal::CtrlD | Signal::CtrlC => {
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println!("\nAborted!");
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break Ok(());
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}
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}
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}
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}
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41
examples/validator.rs
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41
examples/validator.rs
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// Create a reedline object with a custom validator to break the line on unfinished input.
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// cargo run --example validator
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//
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// Input "complete" followed by [Enter], will accept the input line (Signal::Succeed will be called)
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// Pressing [Enter] will in other cases give you a multi-line prompt.
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use reedline::{DefaultPrompt, Reedline, Signal, ValidationResult, Validator};
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use std::io;
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struct CustomValidator;
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// For custom validation, implement the Validator trait
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impl Validator for CustomValidator {
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fn validate(&self, line: &str) -> ValidationResult {
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if line == "complete" {
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ValidationResult::Complete
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} else {
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ValidationResult::Incomplete
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}
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}
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}
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fn main() -> io::Result<()> {
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println!("Input \"complete\" followed by [Enter], will accept the input line (Signal::Succeed will be called)\nPressing [Enter] will in other cases give you a multi-line prompt.\nAbort with Ctrl-C or Ctrl-D");
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let mut line_editor = Reedline::create().with_validator(Box::new(CustomValidator));
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let prompt = DefaultPrompt::default();
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loop {
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let sig = line_editor.read_line(&prompt)?;
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match sig {
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Signal::Success(buffer) => {
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println!("We processed: {}", buffer);
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}
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Signal::CtrlD | Signal::CtrlC => {
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println!("\nAborted!");
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break Ok(());
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}
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}
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}
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}
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