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

CHANGELOG.md

@@ -1,5 +1,10 @@
 TBD
 ===
+Feature enhancements:
+
+* [FEATURE #1547](https://github.com/BurntSushi/ripgrep/pull/1547):
+  Support decompressing `.Z` files via `uncompress`.
+
 Bug fixes:
 
 * [BUG #1252](https://github.com/BurntSushi/ripgrep/issues/1252):

crates/cli/src/decompress.rs

@@ -348,6 +348,7 @@ fn default_decompression_commands() -> Vec<DecompressionCommand> {
     const ARGS_LZMA: &[&str] = &["xz", "--format=lzma", "-d", "-c"];
     const ARGS_BROTLI: &[&str] = &["brotli", "-d", "-c"];
     const ARGS_ZSTD: &[&str] = &["zstd", "-q", "-d", "-c"];
+    const ARGS_UNCOMPRESS: &[&str] = &["uncompress", "-c"];
 
     fn cmd(glob: &str, args: &[&str]) -> DecompressionCommand {
         DecompressionCommand {
@@ -372,5 +373,6 @@ fn default_decompression_commands() -> Vec<DecompressionCommand> {
         cmd("*.br", ARGS_BROTLI),
         cmd("*.zst", ARGS_ZSTD),
         cmd("*.zstd", ARGS_ZSTD),
+        cmd("*.Z", ARGS_UNCOMPRESS),
     ]
 }

crates/ignore/src/default_types.rs

@@ -234,6 +234,7 @@ pub const DEFAULT_TYPES: &[(&str, &[&str])] = &[
     ("xz", &["*.xz", "*.txz"]),
     ("yacc", &["*.y"]),
     ("yaml", &["*.yaml", "*.yml"]),
+    ("z", &["*.Z"]),
     ("zig", &["*.zig"]),
     ("zsh", &[
         ".zshenv", "zshenv",

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;