basic/
basic.rs

1//! Basic usage example for the Rable bash parser.
2//!
3//! Run with: `cargo run --example basic`
4
5#![allow(clippy::expect_used)]
6
7use rable::{NodeKind, parse};
8
9fn main() {
10    // Parse a simple pipeline
11    let source = "echo $USER | grep root";
12    let nodes = parse(source, false).expect("valid bash");
13
14    println!("Source: {source}");
15    println!("S-expression: {}", nodes[0]);
16    println!();
17
18    // Inspect the AST
19    if let NodeKind::Pipeline { commands, .. } = &nodes[0].kind {
20        println!("Pipeline with {} commands:", commands.len());
21        for (i, cmd) in commands.iter().enumerate() {
22            if let NodeKind::Command {
23                words, redirects, ..
24            } = &cmd.kind
25            {
26                let word_values: Vec<_> = words
27                    .iter()
28                    .filter_map(|w| {
29                        if let NodeKind::Word { value, .. } = &w.kind {
30                            Some(value.as_str())
31                        } else {
32                            None
33                        }
34                    })
35                    .collect();
36                println!(
37                    "  Command {}: {:?} ({} redirects)",
38                    i,
39                    word_values,
40                    redirects.len()
41                );
42            }
43        }
44    }
45
46    println!();
47
48    // Parse a compound command
49    let source = r#"if [ -f /etc/passwd ]; then echo "exists"; fi"#;
50    let nodes = parse(source, false).expect("valid bash");
51    println!("Source: {source}");
52    println!("S-expression: {}", nodes[0]);
53    println!();
54
55    // Error handling
56    match parse("if", false) {
57        Ok(_) => println!("Unexpectedly parsed"),
58        Err(e) => {
59            println!(
60                "Parse error at line {}, pos {}: {}",
61                e.line(),
62                e.pos(),
63                e.message()
64            );
65        }
66    }
67}
basic/basic.rs

basic/
basic.rs
