refactor: preserve terminal screen and scrollbuffer (#13)

Maintain the terminal output. If clearing the screen and scrollbuffer is desired, it should be wrapped in an upstream script.

Reviewed-on: https://codeberg.org/vlw/curl/pulls/13

curl.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 # Check if the correct number of arguments is provided
-if [ "$#" -ne 1 ]; then
+if [ -z "${1:-}" ]; then
     echo "Usage: $0 <url> [request_method]"
     exit 1
 fi
@@ -23,7 +23,10 @@ method="${2:-GET}"
 if [ -f $REQ_PARAMS_FILE ]; then
     # Parse each newline as a separate parameter joined by a "&"
     params=$(tr '\n' '&' < "$REQ_PARAMS_FILE" | sed 's/&$//')
+
+    if [ -n "$params" ]; then
         url="${url}?${params}"
+    fi
 fi
 
 # Prepare curl
@@ -63,9 +66,7 @@ fi
 # Save the response headers and body
 curl_cmd="$curl_cmd -o $RESP_BODY_RAW_FILE -D $RESP_HEADERS_FILE"
 
-# Execute curl
-eval "clear"
-
+# Dispatch request
 echo -e "\e[0;92mRequest  >\e[0m ${method} ${url}"
 eval $curl_cmd
 
@@ -73,4 +74,4 @@ eval $curl_cmd
 jq . $RESP_BODY_RAW_FILE > $RESP_BODY_JSON_FILE
 
 # Print the response code
-echo -e -n "\e[0;94mResponse <\e[0m "; awk 'NR==1{print $2, $3; exit}' $RESP_HEADERS_FILE
+echo -e -n "\e[0;94mResponse <\e[0m "; head -n 1 $RESP_HEADERS_FILE