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

plugins/extract/extract.plugin.zsh

@@ -3,20 +3,16 @@ alias x=extract
 extract() {
   setopt localoptions noautopushd
 
-	local remove_archive
-	local success
-	local extract_dir
-
   if (( $# == 0 )); then
-		cat <<-'EOF' >&2
-			Usage: extract [-option] [file ...]
+    cat >&2 <<'EOF'
+Usage: extract [-option] [file ...]
 
-			Options:
+Options:
     -r, --remove    Remove archive after unpacking.
-		EOF
+EOF
   fi
 
-	remove_archive=1
+  local remove_archive=1
   if [[ "$1" == "-r" ]] || [[ "$1" == "--remove" ]]; then
     remove_archive=0
     shift
@@ -30,54 +26,53 @@ extract() {
       continue
     fi
 
-		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 "$1" ;;
+    local success=0
+    local extract_dir="${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 "$1" \
-				|| xzcat "$1" | tar xvf - ;;
+        && tar --xz -xvf "$file" \
+        || xzcat "$file" | tar xvf - ;;
       (*.tar.zma|*.tlz)
         tar --lzma --help &> /dev/null \
-				&& tar --lzma -xvf "$1" \
-				|| lzcat "$1" | tar xvf - ;;
+        && tar --lzma -xvf "$file" \
+        || lzcat "$file" | 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 "$1" ;;
+        && tar --zstd -xvf "$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 "$1" ;;
+      (*.7z) 7za x "$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 "$1" ;;
-			(*.cab) cabextract -d "$extract_dir" "$1" ;;
-			(*.cpio) cpio -idmvF "$1" ;;
+      (*.zst) unzstd "$file" ;;
+      (*.cab) cabextract -d "$extract_dir" "$file" ;;
+      (*.cpio) cpio -idmvF "$file" ;;
       (*)
-				echo "extract: '$1' cannot be extracted" >&2
-				success=1
-			;;
+        echo "extract: '$file' cannot be extracted" >&2
+        success=1 ;;
     esac
 
     (( success = success > 0 ? success : $? ))