feat(search): Highlight search term

This supersedes #10116

Fixes #9918

Author: epage

src/cargo/ops/registry.rs

@@ -13,6 +13,7 @@ use crates_io::{self, NewCrate, NewCrateDependency, Registry};
 use curl::easy::{Easy, InfoType, SslOpt, SslVersion};
 use log::{log, Level};
 use percent_encoding::{percent_encode, NON_ALPHANUMERIC};
+use termcolor::Color::Green;
 use termcolor::ColorSpec;
 
 use crate::core::dependency::DepKind;
@@ -956,9 +957,16 @@ pub fn search(
             }
             None => name,
         };
-        let _ = config
-            .shell()
-            .write_stdout(format_args!("{}\n", line), &ColorSpec::new());
+        let mut fragments = line.split(query).peekable();
+        while let Some(fragment) = fragments.next() {
+            let _ = config.shell().write_stdout(fragment, &ColorSpec::new());
+            if fragments.peek().is_some() {
+                let _ = config
+                    .shell()
+                    .write_stdout(query, &ColorSpec::new().set_bold(true).set_fg(Some(Green)));
+            }
+        }
+        let _ = config.shell().write_stdout("\n", &ColorSpec::new());
     }
 
     let search_max_limit = 100;

tests/testsuite/search.rs

@@ -200,3 +200,17 @@ fn ignore_quiet() {
         .with_stdout_contains(SEARCH_RESULTS)
         .run();
 }
+
+#[cargo_test]
+fn colored_results() {
+    setup();
+    set_cargo_config();
+
+    cargo_process("search --color=never postgres")
+        .with_stdout_does_not_contain("[..]\x1b[[..]")
+        .run();
+
+    cargo_process("search --color=always postgres")
+        .with_stdout_contains("[..]\x1b[[..]")
+        .run();
+}