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use std::cell::Cell;
use std::fmt;
use std::fs::metadata;
use std::time::SystemTime;
use crate::makefile::command_line::CommandLine;
use super::Makefile;
#[derive(PartialEq, Eq, Clone, Debug)]
pub struct Target {
pub name: String,
pub prerequisites: Vec<String>,
pub commands: Vec<CommandLine>,
pub already_updated: Cell<bool>,
}
impl Target {
fn modified_time(&self) -> Option<SystemTime> {
metadata(&self.name)
.and_then(|metadata| metadata.modified())
.ok()
}
pub fn newer_than(&self, other: &Self) -> Option<bool> {
let self_updated = self.already_updated.get();
let other_updated = other.already_updated.get();
Some(match (self.modified_time(), other.modified_time()) {
(Some(self_mtime), Some(other_mtime)) => self_mtime >= other_mtime,
// per POSIX: "If the target does not exist after the target has been
// successfully made up-to-date, the target shall be treated as being
// newer than any target for which it is a prerequisite."
(None, _) if self_updated && other.prerequisites.contains(&self.name) => true,
(_, None) if other_updated && self.prerequisites.contains(&other.name) => false,
_ => return None,
})
}
fn is_up_to_date(&self, file: &Makefile) -> bool {
if self.already_updated.get() {
return true;
}
let exists = metadata(&self.name).is_ok();
let newer_than_all_dependencies = self.prerequisites.iter().all(|t| {
file.get_target(t)
.ok()
.and_then(|t| self.newer_than(&t.borrow()))
.unwrap_or(false)
});
exists && newer_than_all_dependencies
}
pub fn update(&self, file: &Makefile) -> anyhow::Result<()> {
for prereq in &self.prerequisites {
file.update_target(prereq)?;
}
if !self.is_up_to_date(file) {
self.execute_commands(file)?;
}
self.already_updated.set(true);
Ok(())
}
fn execute_commands(&self, file: &Makefile) -> anyhow::Result<()> {
for command in &self.commands {
command.execute(file, self)?;
}
Ok(())
}
}
impl fmt::Display for Target {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let prereqs = self.prerequisites.join(" ");
writeln!(f, "{}: {}", &self.name, prereqs)?;
for command in &self.commands {
writeln!(f, "\t{}", command)?;
}
Ok(())
}
}
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