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//! Remember a list of changes to a Cargo.toml file
use anyhow::{Result, anyhow};
use toml_edit::{Array, Item, Table, Value};
#[derive(Debug, Clone, Default)]
pub struct Changes {
changes: Vec<Change>,
}
#[derive(Debug, Clone)]
pub enum Change {
AddFeature(String),
AddEdge(String, String),
AddExternalEdge(String, String),
Annotate(String, String),
}
fn value_is_str(value: &Value, string: &str) -> bool {
matches! {
value, Value::String(s) if s.value() == string
}
}
impl Change {
fn apply(&self, features: &mut Table) -> Result<()> {
match self {
Change::AddFeature(feature_name) => match features.get(feature_name) {
Some(_) => {} // nothing to do.
None => {
assert!(!feature_name.contains('/'), "/ in {feature_name}");
features.insert(feature_name, Item::Value(Value::Array(Array::new())));
}
},
Change::AddEdge(from, to) => {
// Make sure "to" is there.
Change::AddFeature(to.to_string()).apply(features)?;
Change::AddExternalEdge(from.to_string(), to.to_string()).apply(features)?;
}
Change::AddExternalEdge(from, to) => {
// Make sure "from" is there.
Change::AddFeature(from.to_string()).apply(features)?;
assert!(!from.contains('/'), "/ in {from}");
let array = features
.get_mut(from)
.expect("but we just tried to add {from}!")
.as_array_mut()
.ok_or_else(|| anyhow!("features.{from} wasn't an array!"))?;
if !array.iter().any(|val| value_is_str(val, to)) {
array.push(to);
}
}
Change::Annotate(feature_name, annotation) => {
if features.get(feature_name).is_none() {
return Err(anyhow!(
"no such feature as {feature_name} to annotate with {annotation}"
));
}
let mut key = features.key_mut(feature_name).expect("key not found!?");
let decor = key.leaf_decor_mut();
let prefix = match decor.prefix() {
Some(r) => r.as_str().expect("prefix not a string"), // (We can't proceed if the prefix decor is not a string.)
None => "",
};
if !prefix.contains(annotation) {
let mut new_prefix: String = prefix.to_string();
new_prefix.push('\n');
new_prefix.push_str(annotation);
decor.set_prefix(new_prefix);
}
}
}
Ok(())
}
}
impl Changes {
pub fn push(&mut self, change: Change) {
self.changes.push(change);
}
pub fn drop_annotations(&mut self) {
self.changes
.retain(|change| !matches!(change, Change::Annotate(_, _)));
}
pub fn apply(&self, features: &mut Table) -> Result<()> {
self.changes
.iter()
.try_for_each(|change| change.apply(features))
}
}
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