run shfmt on installer

install

@@ -5,13 +5,24 @@ install_dir="/usr/local/bin"
 add_alias=0
 nightly=0
 
-while true
-do
+while true; do
     case "${1}" in
-        -a|--alias)       add_alias=1; shift 1;;
-        -n|--nightly)     nightly=1; shift 1;;
-        -p|--prefix)      install_dir=/$2; shift 2;;
-        --)               shift 1; break ;;
+    -a | --alias)
+        add_alias=1
+        shift 1
+        ;;
+    -n | --nightly)
+        nightly=1
+        shift 1
+        ;;
+    -p | --prefix)
+        install_dir=/$2
+        shift 2
+        ;;
+    --)
+        shift 1
+        break
+        ;;
     *) break ;;
     esac
 done
@@ -39,15 +50,18 @@ fi
 
 arch="$(uname -m)"
 case "$arch" in
-  x86_64) arch="x86_64" ;;
-  arm64) arch="aarch64" ;;
-  i686) arch="x86" ;;
-  i386) arch="x86" ;;
+x86_64) arch="x86_64" ;;
+arm64) arch="aarch64" ;;
+i686) arch="x86" ;;
+i386) arch="x86" ;;
 esac
 
 # get latest version tag from github releases api
 version=$(curl -s "https://api.github.com/repos/$repo/releases/latest" | grep '"tag_name":' | cut -d'"' -f4)
-[ -z "$version" ] && { echo "failed to fetch latest version"; exit 1; }
+[ -z "$version" ] && {
+    echo "failed to fetch latest version"
+    exit 1
+}
 
 # construct download url
 # note: nightly assets are named like "flow-<version>-<os>-<arch>.<ext>"
@@ -73,7 +87,7 @@ if [ "$filesize" -lt 100 ]; then
     exit 1
 fi
 
-echo "installing $( [ "$nightly" -eq 1 ] && echo 'NIGHTLY build' || echo 'flow')..."
+echo "installing $([ "$nightly" -eq 1 ] && echo 'NIGHTLY build' || echo 'flow')..."
 if [ "$ext" = "tar.gz" ]; then
     tar -xzf "/tmp/$filename.$ext" -C "$install_dir"
 else
@@ -82,7 +96,7 @@ fi
 
 chmod +x "$install_dir/flow"
 rm "/tmp/$filename.$ext"
-echo "$( [ "$nightly" -eq 1 ] && echo 'NIGHTLY build' || echo 'flow') installed successfully!"
+echo "$([ "$nightly" -eq 1 ] && echo 'NIGHTLY build' || echo 'flow') installed successfully!"
 
 create_alias() {
     if [ -e "$install_dir/f" ]; then