laitos-cli: a wip cli shell script

Author: HouzuoGuo

laitos-cli.sh

@@ -0,0 +1,71 @@
+#!/usr/bin/env bash
+
+# A WIP laitos cli shell script.
+
+set -Eeuo pipefail
+export LANG=C LC_ALL=C
+
+handle_exit() {
+    local -r -i exit_status="$?"
+    echo "exiting with status code $exit_status"
+    exit $exit_status
+}
+
+trap handle_exit INT HUP TERM QUIT EXIT
+
+print_usage() {
+    local -r -i exit_status="$1"
+    echo "$0 - laitos client CLI"
+    echo "-u, --url"
+    printf "\tInfo endpoint URLs (e.g. https://example.com/laitos-info), separated by comma, may be repeated.\n"
+    exit $exit_status
+}
+
+main() {
+    local -a url_argv=() urls=()
+    while true; do
+        local arg_val=''
+        if [ $# -eq 0 ]; then
+            break
+        fi
+        case "$1" in
+            -h | --help)
+                print_usage 0
+                ;;
+            --url=*)
+                arg_val="${1#*=}"
+                ;&
+            -u | --url)
+                if [ ! "$arg_val" ]; then
+                    shift
+                    [ $# -ge 1 ] && arg_val="$1"
+                fi
+                [ ! "$arg_val" ] && print_usage 1
+                url_argv+=("$arg_val")
+                ;;
+        esac
+        shift
+    done
+    # Split possibly comma separated server arg values.
+    for argv in "${url_argv[@]}"; do
+        while IFS=',' read -r -a fields; do
+            urls+=("${fields[@]}")
+        done <<<"$argv"
+    done
+
+    printf "Fetching server info from %s URLs...\n" "${#urls[@]}"
+
+    local -A resp=()
+    for url in "${urls[@]}"; do
+        mapfile -d $'\0' resp_body < <(curl -H 'Accept: application/json' "$url" 2>/dev/null)
+        resp["$url"]="$resp_body"
+        wait
+    done
+
+    for key in "${!resp[@]}"; do
+        local val="${resp["$key"]}"
+        printf "%s response length %s\n" "$key" "${#val}"
+    done
+}
+
+main "${@}"