Function group_by 

pub fn group_by<'a>(
    project: &'a Project,
    schedule: &'a Schedule,
    classifier: &dyn Classifier,
) -> Vec<(String, Vec<&'a Task>)>

Groups tasks by classifier categories.

Returns a vector of (category_label, tasks) tuples, sorted by the classifier’s natural order. Empty categories are not included.

Arguments

• project - The project containing tasks to classify
• schedule - The computed schedule (may be used by some classifiers)
• classifier - The classification scheme to apply

Example

use utf8proj_core::{group_by, StatusClassifier};

let groups = group_by(&project, &schedule, &StatusClassifier);
for (category, tasks) in groups {
    println!("{}: {} tasks", category, tasks.len());
}