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|
use super::Poem;
use crate::compose::Environment;
use crate::path;
use crate::poem::anthology;
use crate::poem::elements::rune::Rune;
use crate::poem::elements::stanza::Stanza;
use std::env;
use std::{
io,
sync::{Arc, Mutex},
};
pub trait Reciteable {
fn recite(&self, env: &mut Environment) -> Result<Vec<u8>, io::Error>;
}
impl Reciteable for Poem {
fn recite(&self, env: &mut Environment) -> Result<Vec<u8>, io::Error> {
// Variable for storing the output of a piped verse
let mut out: Vec<u8> = Vec::new();
// Keep track of pids for background processes
let mut pids: Arc<Mutex<Vec<i32>>> = Arc::new(Mutex::new(Vec::new()));
// Loop through each verse in the poem
for verse in self.iter() {
// Verse may need to be mutable
let mut verse = verse.clone();
// Check for environment variables
for word in verse.stanza.iter_mut() {
while word.contains("$") {
let mut name = vec![];
let mut idx = word.chars().position(|c| c == '$').unwrap() + 1;
let bytes = word.as_bytes();
while idx < word.len() {
let c = bytes[idx] as char;
if !c.is_alphanumeric() {
break;
}
name.push(c);
idx += 1;
}
let name: String = format!("${}", name.iter().collect::<String>());
let envar = name[1..].to_string();
let envar = match env::var(envar) {
Ok(envar) => envar.to_string(),
Err(_) => String::new(),
};
*word = word.replace(name.as_str(), envar.as_str());
}
// For any words in single quotes strings that began with a '$',
// need to replace the ASCII SO placeholder with the '$' char once
// more
*word = word.replace('\x0e', "$");
}
// Check if verse is a builtin
let index = anthology::lookup(&verse.verb());
// Run interal poems
let v = verse.clone();
let mut new_stanza: Option<Stanza> = None;
if verse.poems() {
// Collect all the words that have vertical tabs
let mut wordp_indicies = vec![];
let wordps = verse
.stanza
.iter_mut()
.enumerate()
.filter(|(_, w)| w.contains("\x0b"))
.map(|(i, w)| {
wordp_indicies.push(i + 1);
w
})
.collect::<Vec<&mut String>>();
// Loop through each word and replace with the output of the poem
let mut poems = verse.poems.iter();
let mut j = 0;
for wordp in wordps {
let times = wordp
.chars()
.filter(|c| c == &'\x0b')
.collect::<String>()
.len();
for _ in 0..times {
let poem = match poems.next() {
Some(poem) => poem,
None => break, // TODO: Return an error
};
let mut out = poem.recite(env)?;
match out.last() {
Some(last) => {
if *last == b'\n' {
out.remove(out.len() - 1);
}
}
None => {}
}
let out = String::from_utf8_lossy(&out);
if out.contains("\n") && index.is_none() {
let mut out = out.split("\n");
let next = out.next().unwrap_or("").trim();
*wordp = wordp.replacen("\x0b", next, 1).to_string();
let (_, right) = v.stanza.split_at(wordp_indicies[j]);
let mut left = vec![];
let mut right = right.to_vec();
loop {
let next = match out.next() {
Some(next) => next,
None => break,
}
.to_string();
left.push(next);
}
left.append(&mut right);
new_stanza = Some(left.clone());
} else {
*wordp = wordp.replacen("\x0b", &out, 1).to_string();
}
}
j += 1;
}
}
match new_stanza {
Some(stanza) => {
let mut stanza = stanza.clone();
verse.stanza.append(&mut stanza);
}
None => {}
};
// Incant the verse if it's a built-in
let status = if index.is_some() {
anthology::incant(&verse, &mut out, index.unwrap(), env)
} else {
// Checking for environment variables and running internal
// poems may mean that the verb is empty now, so check it once
// more
// If it is empty, just continue to the next verse
if !verse.verb().is_empty() {
// Check if the verb exists on the PATH
// If it doesn't exist, try refreshing the binary cache, and check
// again
// If it still doesn't exist, print an error
if !verse.spellcheck(&env.bins) {
env.bins = path::refresh();
if !verse.spellcheck(&env.bins) {
eprintln!("dwvsh: {}: command not found", verse.verb());
if verse.meter != Rune::And {
continue;
}
}
}
} else {
continue;
}
verse.incant(&mut out, &mut pids)?
};
// Break from the loop if the meter is not [Rune::Continue], and
// if the status is not 0
// For [Rune::Quiet], [Rune::incant_quiet] will always return 0
if verse.meter != Rune::Continue && status != 0 {
break;
}
}
// If we've successfully exited the loop, then all verses were properly
// recited
Ok(out)
}
}
|
