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Merged
merged 2 commits into from
Sep 30, 2025
Merged

Apply labels from left to right in relabel #2189

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18dabcf
Make relabel deltas left to right consistent
Urgau Sep 30, 2025
ced76f0
Simplify issue handling in relabel and add comments
Urgau Sep 30, 2025
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2 changes: 1 addition & 1 deletion parser/src/command/relabel.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -19,7 +19,7 @@ pub enum LabelDelta {
}

#[derive(Debug, PartialEq, Eq, Clone)]
pub struct Label(String);
pub struct Label(pub String);

#[derive(PartialEq, Eq, Debug)]
pub enum ParseError {
Expand Down
2 changes: 1 addition & 1 deletion src/github.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -324,7 +324,7 @@ impl User {
}
}

#[derive(PartialEq, Eq, Debug, Clone, serde::Deserialize)]
#[derive(PartialEq, Eq, Debug, Clone, Ord, PartialOrd, serde::Deserialize)]
pub struct Label {
pub name: String,
}
Expand Down
135 changes: 103 additions & 32 deletions src/handlers/relabel.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,9 @@
//! If the command was successful, there will be no feedback beyond the label change to reduce
//! notification noise.

use std::collections::BTreeSet;

use crate::github::Label;
use crate::team_data::TeamClient;
use crate::{
config::RelabelConfig,
Expand All @@ -24,8 +27,11 @@ pub(super) async fn handle_command(
event: &Event,
input: RelabelCommand,
) -> anyhow::Result<()> {
let mut results = vec![];
let mut to_add = vec![];
let Some(issue) = event.issue() else {
anyhow::bail!("event is not an issue");
};

// Check label authorization for the current user
for delta in &input.0 {
let name = delta.label().as_str();
let err = match check_filter(name, config, is_member(&event.user(), &ctx.team).await) {
Expand All @@ -42,54 +48,37 @@ pub(super) async fn handle_command(
Err(err) => Some(err),
};
if let Some(msg) = err {
let cmnt = ErrorComment::new(&event.issue().unwrap(), msg);
let cmnt = ErrorComment::new(issue, msg);
cmnt.post(&ctx.github).await?;
return Ok(());
}
match delta {
LabelDelta::Add(label) => {
to_add.push(github::Label {
name: label.to_string(),
});
}
LabelDelta::Remove(label) => {
results.push((
label,
event.issue().unwrap().remove_label(&ctx.github, &label),
));
}
}
}

if let Err(e) = event
.issue()
.unwrap()
.add_labels(&ctx.github, to_add.clone())
.await
{
// Compute the labels to add and remove
let (to_add, to_remove) = compute_label_deltas(&input.0);

// Add labels
if let Err(e) = issue.add_labels(&ctx.github, to_add.clone()).await {
tracing::error!(
"failed to add {:?} from issue {}: {:?}",
to_add,
event.issue().unwrap().global_id(),
issue.global_id(),
e
);
if let Some(err @ UnknownLabels { .. }) = e.downcast_ref() {
event
.issue()
.unwrap()
.post_comment(&ctx.github, &err.to_string())
.await?;
issue.post_comment(&ctx.github, &err.to_string()).await?;
}

return Err(e);
}

for (label, res) in results {
if let Err(e) = res.await {
// Remove labels
for label in to_remove {
if let Err(e) = issue.remove_label(&ctx.github, &label.name).await {
tracing::error!(
"failed to remove {:?} from issue {}: {:?}",
label,
event.issue().unwrap().global_id(),
issue.global_id(),
e
);
return Err(e);
Expand Down Expand Up @@ -182,10 +171,41 @@ fn match_pattern(pattern: &str, label: &str) -> anyhow::Result<MatchPatternResul
})
}

fn compute_label_deltas(deltas: &[LabelDelta]) -> (Vec<Label>, Vec<Label>) {
let mut add = BTreeSet::new();
let mut remove = BTreeSet::new();

for delta in deltas {
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Just a note to myself: this implementation means that doing +foo -foo -foo will actually remove foo from the issue. This is probably useful for something like alias -foo, where alias does +foo -foo.

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Yeah, and it also means that +foo +foo -foo does nothing (+foo +foo -> +foo and +foo -foo cancels each other out).

match delta {
LabelDelta::Add(label) => {
let label = Label {
name: label.to_string(),
};
if !remove.remove(&label) {
add.insert(label);
}
}
LabelDelta::Remove(label) => {
let label = Label {
name: label.to_string(),
};
if !add.remove(&label) {
remove.insert(label);
}
}
}
}

(add.into_iter().collect(), remove.into_iter().collect())
}

#[cfg(test)]
mod tests {
use parser::command::relabel::{Label, LabelDelta};

use super::{
CheckFilterResult, MatchPatternResult, TeamMembership, check_filter, match_pattern,
CheckFilterResult, MatchPatternResult, TeamMembership, check_filter, compute_label_deltas,
match_pattern,
};
use crate::config::RelabelConfig;

Expand Down Expand Up @@ -252,4 +272,55 @@ mod tests {
}
Ok(())
}

#[test]
fn test_compute_label_deltas() {
use crate::github::Label as GitHubLabel;

let mut deltas = vec![
LabelDelta::Add(Label("I-nominated".to_string())),
LabelDelta::Add(Label("I-nominated".to_string())),
LabelDelta::Add(Label("I-lang-nominated".to_string())),
LabelDelta::Add(Label("I-libs-nominated".to_string())),
LabelDelta::Remove(Label("I-lang-nominated".to_string())),
];

assert_eq!(
compute_label_deltas(&deltas),
(
vec![
GitHubLabel {
name: "I-libs-nominated".to_string()
},
GitHubLabel {
name: "I-nominated".to_string()
},
],
vec![],
),
);

deltas.push(LabelDelta::Remove(Label("needs-triage".to_string())));
deltas.push(LabelDelta::Add(Label("I-lang-nominated".to_string())));

assert_eq!(
compute_label_deltas(&deltas),
(
vec![
GitHubLabel {
name: "I-lang-nominated".to_string()
},
GitHubLabel {
name: "I-libs-nominated".to_string()
},
GitHubLabel {
name: "I-nominated".to_string()
},
],
vec![GitHubLabel {
name: "needs-triage".to_string()
}],
),
);
}
}
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