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@ -25,6 +25,7 @@
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*/
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use crate::runner::Runner;
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use crate::tokenizer;
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use clap::load_yaml;
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use clap::App;
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use crossterm::terminal::{Clear, ClearType};
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@ -34,6 +35,8 @@ use libsky::VERSION;
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use readline::config::Configurer;
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use readline::{error::ReadlineError, Editor};
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use rustyline as readline;
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use skytable::Pipeline;
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use skytable::Query;
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use std::io::stdout;
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use std::process;
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const ADDR: &str = "127.0.0.1";
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@ -69,6 +72,7 @@ the server. These enable you to do convenient things like:
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- "clear": clears the terminal screen
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Apart from these, you can use the following shell commands:
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- "!pipe": Lets you create a pipeline. Terminate with a semicolon (`;`)
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- "!help": Brings up this help menu
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- "?<command name>": Describes what the built-in shell command is for
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@ -132,57 +136,84 @@ pub async fn start_repl() {
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}
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loop {
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match editor.readline(SKYSH_PROMPT) {
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Ok(mut line) => match line.to_lowercase().as_str() {
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"exit" => break,
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"clear" => {
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let mut stdout = stdout();
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execute!(stdout, Clear(ClearType::All)).expect("Failed to clear screen");
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execute!(stdout, cursor::MoveTo(0, 0))
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.expect("Failed to move cursor to origin");
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drop(stdout); // aggressively drop stdout
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continue;
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}
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"help" => {
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println!("To get help, run `!help`");
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continue;
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Ok(mut line) => {
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macro_rules! tokenize {
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($inp:expr) => {
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match tokenizer::get_query($inp) {
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Ok(q) => q,
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Err(e) => {
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eskysh!(e);
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continue;
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}
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}
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};
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() => {
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tokenize!(line.as_bytes())
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};
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}
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_ => {
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if line.is_empty() {
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match line.to_lowercase().as_str() {
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"exit" => break,
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"clear" => {
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clear_screen();
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continue;
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}
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match line.as_bytes()[0] {
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b'#' => continue,
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b'!' => {
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// handle a shell command
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match &line.as_bytes()[1..] {
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b"" => eskysh!("Bad shell command"),
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b"help" => println!("{}", HELP_TEXT),
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_ => eskysh!("Unknown shell command"),
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}
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"help" => {
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println!("To get help, run `!help`");
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continue;
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}
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_ => {
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if line.is_empty() {
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continue;
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}
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b'?' => {
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// handle explanation for a shell command
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match &line.as_bytes()[1..] {
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b"" => eskysh!("Bad shell command"),
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b"help" => println!("`!help` shows the help menu"),
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b"exit" => println!("`exit` ends the shell session"),
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b"clear" => println!("`clear` clears the terminal screen"),
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_ => eskysh!("Unknown shell command"),
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match line.as_bytes()[0] {
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b'#' => continue,
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b'!' => {
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match &line.as_bytes()[1..] {
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b"" => eskysh!("Bad shell command"),
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b"help" => println!("{}", HELP_TEXT),
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b"pipe" => {
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// so we need to handle a pipeline
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let mut pipeline = Pipeline::new();
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line = readln!(editor);
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loop {
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if !line.is_empty() {
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if *(line.as_bytes().last().unwrap()) == b';' {
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break;
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} else {
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let q: Query = tokenize!();
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pipeline.push(q);
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}
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}
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line = readln!(editor);
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}
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if line.len() > 1 {
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line.drain(line.len() - 1..);
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let q: Query = tokenize!();
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pipeline.push(q);
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}
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runner.run_pipeline(pipeline).await;
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}
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_ => eskysh!("Unknown shell command"),
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}
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continue;
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}
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continue;
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b'?' => {
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// handle explanation for a shell command
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print_help(&line);
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continue;
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}
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_ => {}
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}
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_ => {}
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}
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while line.len() >= 2 && line[line.len() - 2..].as_bytes().eq(br#" \"#) {
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// continuation on next line
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let cl = readln!(editor);
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line.drain(line.len() - 2..);
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line.extend(cl.chars());
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while line.len() >= 2 && line[line.len() - 2..].as_bytes().eq(br#" \"#) {
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// continuation on next line
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let cl = readln!(editor);
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line.drain(line.len() - 2..);
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line.extend(cl.chars());
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}
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runner.run_query(&line).await
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}
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runner.run_query(&line).await
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}
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},
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}
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Err(ReadlineError::Interrupted) => break,
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Err(err) => fatal!("ERROR: Failed to read line with error: {}", err),
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}
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@ -194,3 +225,21 @@ pub async fn start_repl() {
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})
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.unwrap();
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}
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fn print_help(line: &str) {
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match &line.as_bytes()[1..] {
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b"" => eskysh!("Bad shell command"),
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b"help" => println!("`!help` shows the help menu"),
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b"exit" => println!("`exit` ends the shell session"),
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b"clear" => println!("`clear` clears the terminal screen"),
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b"pipe" | b"!pipe" => println!("`!pipe` lets you run pipelines using the shell"),
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_ => eskysh!("Unknown shell command"),
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}
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}
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fn clear_screen() {
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let mut stdout = stdout();
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execute!(stdout, Clear(ClearType::All)).expect("Failed to clear screen");
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execute!(stdout, cursor::MoveTo(0, 0)).expect("Failed to move cursor to origin");
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drop(stdout); // aggressively drop stdout
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}
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Sayan Nandan
3 years ago