style(extract): adopt main code style guide and refactor variables

plugins/extract/extract.plugin.zsh

 alias x=extract
 
 extract() {
-	setopt localoptions noautopushd
+  setopt localoptions noautopushd
 
-	local remove_archive
-	local success
-	local extract_dir
+  if (( $# == 0 )); then
+    cat >&2 <<'EOF'
+Usage: extract [-option] [file ...]
 
-	if (( $# == 0 )); then
-		cat <<-'EOF' >&2
-			Usage: extract [-option] [file ...]
+Options:
+    -r, --remove    Remove archive after unpacking.
+EOF
+  fi
 
-			Options:
-			    -r, --remove    Remove archive after unpacking.
-		EOF
-	fi
+  local remove_archive=1
+  if [[ "$1" == "-r" ]] || [[ "$1" == "--remove" ]]; then
+    remove_archive=0
+    shift
+  fi
 
-	remove_archive=1
-	if [[ "$1" == "-r" ]] || [[ "$1" == "--remove" ]]; then
-		remove_archive=0
-		shift
-	fi
+  local pwd="$PWD"
+  while (( $# > 0 )); do
+    if [[ ! -f "$1" ]]; then
+      echo "extract: '$1' is not a valid file" >&2
+      shift
+      continue
+    fi
 
-	local pwd="$PWD"
-	while (( $# > 0 )); do
-		if [[ ! -f "$1" ]]; then
-			echo "extract: '$1' is not a valid file" >&2
-			shift
-			continue
-		fi
+    local success=0
+    local extract_dir="${1:t:r}"
+    local file="$1" full_path="${1:A}"
+    case "${file:l}" in
+      (*.tar.gz|*.tgz) (( $+commands[pigz] )) && { pigz -dc "$file" | tar xv } || tar zxvf "$file" ;;
+      (*.tar.bz2|*.tbz|*.tbz2) tar xvjf "$file" ;;
+      (*.tar.xz|*.txz)
+        tar --xz --help &> /dev/null \
+        && tar --xz -xvf "$file" \
+        || xzcat "$file" | tar xvf - ;;
+      (*.tar.zma|*.tlz)
+        tar --lzma --help &> /dev/null \
+        && tar --lzma -xvf "$file" \
+        || lzcat "$file" | tar xvf - ;;
+      (*.tar.zst|*.tzst)
+        tar --zstd --help &> /dev/null \
+        && tar --zstd -xvf "$file" \
+        || zstdcat "$file" | tar xvf - ;;
+      (*.tar) tar xvf "$file" ;;
+      (*.tar.lz) (( $+commands[lzip] )) && tar xvf "$file" ;;
+      (*.tar.lz4) lz4 -c -d "$file" | tar xvf - ;;
+      (*.tar.lrz) (( $+commands[lrzuntar] )) && lrzuntar "$file" ;;
+      (*.gz) (( $+commands[pigz] )) && pigz -dk "$file" || gunzip -k "$file" ;;
+      (*.bz2) bunzip2 "$file" ;;
+      (*.xz) unxz "$file" ;;
+      (*.lrz) (( $+commands[lrunzip] )) && lrunzip "$file" ;;
+      (*.lz4) lz4 -d "$file" ;;
+      (*.lzma) unlzma "$file" ;;
+      (*.z) uncompress "$file" ;;
+      (*.zip|*.war|*.jar|*.ear|*.sublime-package|*.ipa|*.ipsw|*.xpi|*.apk|*.aar|*.whl) unzip "$file" -d "$extract_dir" ;;
+      (*.rar) unrar x -ad "$file" ;;
+      (*.rpm)
+        command mkdir -p "$extract_dir" && builtin cd -q "$extract_dir" \
+        && rpm2cpio "$full_path" | cpio --quiet -id ;;
+      (*.7z) 7za x "$file" ;;
+      (*.deb)
+        command mkdir -p "$extract_dir/control" "$extract_dir/data"
+        builtin cd -q "$extract_dir"; ar vx "$full_path" > /dev/null
+        builtin cd -q control; extract ../control.tar.*
+        builtin cd -q ../data; extract ../data.tar.*
+        builtin cd -q ..; command rm *.tar.* debian-binary ;;
+      (*.zst) unzstd "$file" ;;
+      (*.cab) cabextract -d "$extract_dir" "$file" ;;
+      (*.cpio) cpio -idmvF "$file" ;;
+      (*)
+        echo "extract: '$file' cannot be extracted" >&2
+        success=1 ;;
+    esac
 
-		success=0
-		extract_dir="${1:t:r}"
-		local full_path="${1:A}"
-		case "${1:l}" in
-			(*.tar.gz|*.tgz) (( $+commands[pigz] )) && { pigz -dc "$1" | tar xv } || tar zxvf "$1" ;;
-			(*.tar.bz2|*.tbz|*.tbz2) tar xvjf "$1" ;;
-			(*.tar.xz|*.txz)
-				tar --xz --help &> /dev/null \
-				&& tar --xz -xvf "$1" \
-				|| xzcat "$1" | tar xvf - ;;
-			(*.tar.zma|*.tlz)
-				tar --lzma --help &> /dev/null \
-				&& tar --lzma -xvf "$1" \
-				|| lzcat "$1" | tar xvf - ;;
-			(*.tar.zst|*.tzst)
-				tar --zstd --help &> /dev/null \
-				&& tar --zstd -xvf "$1" \
-				|| zstdcat "$1" | tar xvf - ;;
-			(*.tar) tar xvf "$1" ;;
-			(*.tar.lz) (( $+commands[lzip] )) && tar xvf "$1" ;;
-			(*.tar.lz4) lz4 -c -d "$1" | tar xvf - ;;
-			(*.tar.lrz) (( $+commands[lrzuntar] )) && lrzuntar "$1" ;;
-			(*.gz) (( $+commands[pigz] )) && pigz -dk "$1" || gunzip -k "$1" ;;
-			(*.bz2) bunzip2 "$1" ;;
-			(*.xz) unxz "$1" ;;
-			(*.lrz) (( $+commands[lrunzip] )) && lrunzip "$1" ;;
-			(*.lz4) lz4 -d "$1" ;;
-			(*.lzma) unlzma "$1" ;;
-			(*.z) uncompress "$1" ;;
-			(*.zip|*.war|*.jar|*.ear|*.sublime-package|*.ipa|*.ipsw|*.xpi|*.apk|*.aar|*.whl) unzip "$1" -d "$extract_dir" ;;
-			(*.rar) unrar x -ad "$1" ;;
-			(*.rpm)
-				command mkdir -p "$extract_dir" && builtin cd -q "$extract_dir" \
-				&& rpm2cpio "$full_path" | cpio --quiet -id ;;
-			(*.7z) 7za x "$1" ;;
-			(*.deb)
-				command mkdir -p "$extract_dir/control" "$extract_dir/data"
-				builtin cd -q "$extract_dir"; ar vx "$full_path" > /dev/null
-				builtin cd -q control; extract ../control.tar.*
-				builtin cd -q ../data; extract ../data.tar.*
-				builtin cd -q ..; command rm *.tar.* debian-binary ;;
-			(*.zst) unzstd "$1" ;;
-			(*.cab) cabextract -d "$extract_dir" "$1" ;;
-			(*.cpio) cpio -idmvF "$1" ;;
-			(*)
-				echo "extract: '$1' cannot be extracted" >&2
-				success=1
-			;;
-		esac
+    (( success = success > 0 ? success : $? ))
+    (( success == 0 && remove_archive == 0 )) && rm "$full_path"
+    shift
 
-		(( success = success > 0 ? success : $? ))
-		(( success == 0 && remove_archive == 0 )) && rm "$full_path"
-		shift
-
-		# Go back to original working directory in case we ran cd previously
-		builtin cd -q "$pwd"
-	done
+    # Go back to original working directory in case we ran cd previously
+    builtin cd -q "$pwd"
+  done
 }