grep-cli: support files compressed by compress(1)

While Linux distributions (at least Arch Linux, RHEL, Debian) do not support
compressing files with compress(1), macOS & AIX do (the utility is part of
POSIX). Additionally, gzip is able to uncompress such compressed files and
provides an `uncompress` binary.

Closes #1547

2 files changed, 15 insertions, 0 deletions

diff --git a/tests/data/sherlock.Z b/tests/data/sherlock.Z
new file mode 100644
index 00000000..9ffa9283
--- /dev/null
+++ b/tests/data/sherlock.Z
diff --git a/tests/misc.rs b/tests/misc.rs
index 16792a2b..9ec1107e 100644
--- a/tests/misc.rs
+++ b/tests/misc.rs
@@ -970,6 +970,21 @@ be, to a very large extent, the result of luck. Sherlock Holmes
     eqnice!(expected, cmd.stdout());
 });
 
+rgtest!(compressed_uncompress, |dir: Dir, mut cmd: TestCommand| {
+    if !cmd_exists("uncompress") {
+        return;
+    }
+
+    dir.create_bytes("sherlock.Z", include_bytes!("./data/sherlock.Z"));
+    cmd.arg("-z").arg("Sherlock").arg("sherlock.Z");
+
+    let expected = "\
+    For the Doctor Watsons of this world, as opposed to the Sherlock
+be, to a very large extent, the result of luck. Sherlock Holmes
+";
+    eqnice!(expected, cmd.stdout());
+});
+
 rgtest!(compressed_failing_gzip, |dir: Dir, mut cmd: TestCommand| {
     if !cmd_exists("gzip") {
         return;