Added custom configuration file location support

example_configs/httpcheck_telegram

@@ -1,7 +1,4 @@
-# Bot Info
-CHATID="5555555"
-KEY="THISISAUNIQUEANDPRIVATEKEY"
-
-# Site list (file location)
-CHKLIST="${HOME}/.site_check"
+CHATID="5555555"                    #Chat ID for the Telegram room/conversation with bot
+KEY="THISISAUNIQUEANDPRIVATEKEY"    #Your bot's API key
+CHKLIST="${HOME}/.site_check"       #A file containing a list of sites/URLs to check
 

http_check_telegram

@@ -1,9 +1,41 @@
 #!/bin/sh
 
 PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin:/usr/local/bin
+CONFIG=$1
+
+# BEGIN CONFIG CHECK
+### Provides KEY, CHATID, CHKLIST
+if [ -n "$CONFIG" ]; then
+    if [ -f "$CONFIG" ]; then
+        source $CONFIG
+    else
+        printf '%s\n' "$CONFIG: File does not exist." >&2
+        exit 10
+    fi
+else
+    if [ -f ".httpcheck_telegram" ]; then
+        source .httpcheck_telegram
+    else
+        printf '%s\n' "No configuration file found." >&2
+        exit 10
+    fi
+fi
+# Check if config was loaded by examining all configuration variables, exit if not
+if [ -z "$KEY" ]; then
+    printf '%s\n' "Configuration not set correctly: KEY not set" >&2
+    ERROR11=true
+fi
+if [ -z "$CHATID" ]; then
+    printf '%s\n' "Configuration not set correctly: CHATID not set" >&2
+    ERROR11=true
+fi
+if [ -z "$CHKLIST" ]; then
+    printf '%s\n' "Configuration not set correctly: CHKLIST not set" >&2
+    ERROR11=true
+fi
+[ "$ERROR11" = "true" ] && exit 11
+# END CONFIG CHECK
 
-# Load Telegram bot info
-source .httpcheck_telegram  #Provides KEY, CHATID, CHKLIST
 
 TIME="10"
 URL="https://api.telegram.org/bot$KEY/sendMessage"