injm 0.4.0

A CLI tool that injects content into marked regions in source files.
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use std::collections::HashSet;
use std::fs;
use std::io::{self, Read};
use std::path::PathBuf;

use crate::core::inject::inject;
use crate::core::{
    parse::parse_file,
    types::{MarkerBlock, OutputID, Result},
};

pub fn run(
    input: Option<PathBuf>,
    output: PathBuf,
    dry_run: bool,
    ids: Vec<OutputID>,
) -> Result<()> {
    let (output_content, output_blocks) = parse_file(&output)?;
    let input_blocks = match input {
        Some(input_file) => {
            let (_, blocks) = parse_file(&input_file)?;
            check_missing_ids(&output_blocks, &blocks)?;
            blocks
        }
        None => stdin_blocks(ids)?,
    };

    let replaced = inject(&output_content, &output_blocks, &input_blocks)?;
    if dry_run {
        println!("{replaced}");
    } else {
        fs::write(output, replaced)?;
    }

    Ok(())
}

fn read_stdin() -> Result<String> {
    let mut input = String::new();
    io::stdin().read_to_string(&mut input)?;
    Ok(input)
}

fn check_missing_ids(output_blocks: &[MarkerBlock], input_blocks: &[MarkerBlock]) -> Result<()> {
    let provided: HashSet<&String> = input_blocks.iter().flat_map(|b| &b.input_ids).collect();
    for b in output_blocks {
        if let Some(id) = &b.output_id {
            if !provided.contains(id) {
                return Err(format!("missing input id `{id}`").into());
            }
        }
    }
    Ok(())
}

fn stdin_blocks(ids: Vec<OutputID>) -> Result<Vec<MarkerBlock>> {
    let stdin = read_stdin()?;
    let input_ids = ids.into_iter().flatten().collect();
    Ok(vec![MarkerBlock {
        input_content: Some(stdin),
        begin_line: 0,
        end_line: 0,
        input_ids: input_ids,
        output_id: None,
    }])
}