fix(extract): preserve .lzma and .Z source files (#14191)

plugins/extract/extract.plugin.zsh

@@ -107,8 +107,8 @@ EOF
       (*.xz) xzcat "$full_path" > "${file:t:r}" ;;
       (*.lrz) (( $+commands[lrunzip] )) && lrunzip "$full_path" ;;
       (*.lz4) lz4 -d "$full_path" ;;
-      (*.lzma) unlzma "$full_path" ;;
-      (*.z) uncompress "$full_path" ;;
+      (*.lzma) unlzma -c "$full_path" > "${file:t:r}" ;;
+      (*.z) uncompress -c "$full_path" > "${file:t:r}" ;;
       (*.zip|*.war|*.jar|*.ear|*.sublime-package|*.ipa|*.ipsw|*.xpi|*.apk|*.aar|*.whl|*.vsix|*.crx|*.pk3|*.pk4) unzip "$full_path" ;;
       (*.rar)
         if (( $+commands[unrar] )); then

plugins/extract/tests/extract.test.zsh

@@ -0,0 +1,65 @@
+#!/usr/bin/env zsh
+
+# Run with: zsh -df plugins/extract/tests/extract.test.zsh
+emulate -L zsh
+setopt err_return
+
+for tool in lzma unlzma uncompress; do
+  (( $+commands[$tool] )) || {
+    print -u2 -r -- "These tests require $tool."
+    exit 1
+  }
+done
+
+source "${0:A:h:h}/extract.plugin.zsh"
+local test_dir=$(mktemp -d) original_dir=$PWD
+
+check_extract() {
+  local extension=$1 mode=$2
+  local case_dir="$test_dir/$extension-$mode"
+  mkdir -p "$case_dir/source files" "$case_dir/work/target dir"
+  local archive="$case_dir/source files/sample.txt.$extension"
+  cp "$test_dir/fixture.$extension" "$archive"
+  builtin cd "$case_dir/work"
+
+  local output="$PWD/sample.txt"
+  local -a args
+  case "$mode" in
+    target)
+      args=(-t 'target dir')
+      output="$PWD/target dir/sample.txt"
+      ;;
+    remove) args=(-r) ;;
+  esac
+
+  # Run the plugin without the test's ERR_RETURN option.
+  () {
+    emulate -L zsh
+    extract "${args[@]}" "$archive"
+  } || return 1
+  cmp "$test_dir/plain" "$output"
+  if [[ $mode == remove ]]; then
+    [[ ! -e $archive ]]
+  else
+    [[ -f $archive ]]
+  fi
+  print -r -- "PASS: $extension ($mode)"
+}
+
+{
+  print -r -- hello > "$test_dir/plain"
+  lzma -c "$test_dir/plain" > "$test_dir/fixture.lzma"
+  # "hello\n" as a .Z stream, since many systems only ship uncompress.
+  printf '\037\235\220\150\312\260\141\363\106\001' \
+    > "$test_dir/fixture.Z"
+
+  for extension in lzma Z; do
+    for mode in default target remove; do
+      check_extract "$extension" "$mode"
+    done
+  done
+  print 'All extract compressed-file tests passed.'
+} always {
+  builtin cd "$original_dir"
+  rm -rf -- "$test_dir"
+}