introduce workspace

crates/core/src/search.rs

@@ -0,0 +1,89 @@
+use std::collections::HashSet;
+use std::iter::Peekable;
+use std::vec::IntoIter;
+
+use anyhow::{bail, Context, Result};
+use clap::ArgMatches;
+use regex::Regex;
+
+use crate::grouping::{Group, Package, Section};
+
+pub const NO_PACKAGES_FOUND: &str = "no packages matching query";
+
+pub(crate) fn search_packages(args: &ArgMatches, groups: &HashSet<Group>) -> Result<()> {
+    let search_string = args
+        .get_one::<String>("string")
+        .context("getting search string from arg")?;
+
+    let re = Regex::new(search_string)?;
+
+    let mut vec = vec![];
+
+    for group in groups {
+        for section in &group.sections {
+            for package in &section.packages {
+                if re.is_match(&package.name) {
+                    vec.push((group, section, package));
+                }
+            }
+        }
+    }
+
+    if vec.is_empty() {
+        bail!(NO_PACKAGES_FOUND)
+    }
+
+    print_triples(vec);
+
+    Ok(())
+}
+
+fn print_triples(mut vec: Vec<(&Group, &Section, &Package)>) {
+    vec.sort_unstable();
+
+    let mut g0 = String::new();
+    let mut s0 = String::new();
+
+    let mut iter = vec.into_iter().peekable();
+
+    while let Some((g, s, p)) = iter.next() {
+        print_group_if_changed(g, &g0, &mut s0);
+        print_section_if_changed(s, &s0);
+        println!("{p}");
+        save_group_and_section_name(&mut g0, g, &mut s0, s);
+        print_separator_unless_exhausted(&mut iter, &g0);
+    }
+}
+
+fn save_group_and_section_name(g0: &mut String, g: &Group, s0: &mut String, s: &Section) {
+    *g0 = g.name.clone();
+    *s0 = s.name.clone();
+}
+
+fn print_separator_unless_exhausted(
+    iter: &mut Peekable<IntoIter<(&Group, &Section, &Package)>>,
+    g0: &String,
+) {
+    if let Some((g, _, _)) = iter.peek() {
+        if g.name != *g0 {
+            println!();
+        }
+    }
+}
+
+fn print_section_if_changed(s: &Section, s0: &String) {
+    if s.name != *s0 {
+        println!("[{}]", s.name);
+    }
+}
+
+fn print_group_if_changed(g: &Group, g0: &String, s0: &mut String) {
+    if g.name != *g0 {
+        println!("{}", g.name);
+        for _ in 0..g.name.len() {
+            print!("-");
+        }
+        println!();
+        s0.clear();
+    }
+}