Add some help

-showHelp()

keywords2insta.sh

@@ -1,7 +1,12 @@
 #!/usr/bin/env bash
 
 red="\033[1;31m"
+greenbold="\033[1;32m"
+green="\033[0;32m"
+yellow="\033[0;33m"
 bold="\033[1m"
+bold_under="\033[1;4m"
+underline="\033[4m"
 reset="\033[0m"
 
 
@@ -23,10 +28,84 @@ opt_nature=false
 opt_wildlife=false
 opt_all=true
 
+showHelp() {
+	echo -e "${greenbold}keywords2insta${reset} v0.5"
+	echo -e "Bruno <bruno<clicclac.info>"
+	echo -e "Read exif and keywords from an image file, and copy them to the clipboard, "
+	echo -e " ready for Instagram and Flickr."
+	echo
+	echo -e "${yellow}USAGE:${reset}"
+	echo -e "${green}keyword2insta [-Options...] -f  <file>${reset}"
+	echo -e "If no option is chosen, all tags are added (default). "
+	echo -e "Keywords taken from exifs are automatically added."
+	echo -e "The images files are not modified."
+	echo
+	echo -e "${yellow}OPTIONS:${reset}"
+	echo -e "     ${green}-f${reset}, ${green}--file <file>${reset}  Image file"
+	echo -e "     ${green}-l${reset}, ${green}--lens${reset}         Add lens exif"
+	echo -e "     ${green}-m${reset}, ${green}--model${reset}        Add APN model exif"
+	echo -e "     ${green}-n${reset}, ${green}--nature${reset}       Add nature related keywords"
+	echo -e "     ${green}-r${reset}, ${green}--region${reset}       Add region related keywords"
+	echo -e "     ${green}-t${reset} <keyword>${reset}       Add some additionnals keywords"
+	echo -e "     ${green}-w${reset}, ${green}--wildlife${reset}     Add wildlife related keywords"
+	echo -e "     ${green}-h${reset}, ${green}--help${reset}         Display this help"
+	echo
+	echo -e "${yellow}REQUIEREMENTS:${reset}"
+	echo -e "  -${underline}exiftool${reset} for extract exifs ${bold}(requis)${reset}"
+	echo -e "      brew install exiftool"
+	echo -e "  -${underline}iconv${reset} for suppress accent (optional"
+	echo -e "      brew install iconv"
+	echo -e "  -${underline}gawk${reset} for suppress doubles (optional)"
+	echo -e "      brew install gawk"
+	echo
+	echo -e "${yellow}EXAMPLES:${reset}"
+	echo -e "  keyword2insta -f image.jpg"
+	echo -e "  keyword2insta -lm -f image.jpg"
+	echo -e "  keyword2insta --lens --model --file image.jpg"
+	echo -e "  keyword2insta -lm -t deer mammal animal -f deer.jpg"
+	echo
+	echo -e "${yellow}EXIT CODES:${reset}"
+	echo -e "  0: Success !"
+	echo -e "  1: Exiftool could not be found."
+	echo -e "  2: No image file."
+	echo -e "  3: Unknown long option."
+	echo -e "  4: Unknown short option."
+	echo -e "  5: No Keywords found in image file."
+}
+
+# https://stackoverflow.com/questions/402377/using-getopts-to-process-long-and-short-command-line-options
+# le 1er : de $optspec supprime le message d'erreur
 unset -v tags
-while getopts "wnrf:t:ml" opt
+#OPTIND=1
+optspec=":wnrf:t:mlh-:"
+while getopts "$optspec" opt
 do
 	case $opt in
+		-) case "${OPTARG}" in
+			help) showHelp; exit;;
+			wildlife) opt_wildlife=true;;
+			nature) opt_nature=true;;
+			region) opt_region=true;;
+			# "$@" --lens -t mammifère foret animal --file /Users/bruno/Pictures/Export/2022/Juillet/2022-07-01_Chevrette_3462.jpg
+			# "${OPTARG}" file
+			# "${OPTIND}" 7
+			file) 
+				file="${!OPTIND}"; OPTIND=$(( $OPTIND + 1 ))
+				;;
+			file=*)
+				file=${OPTARG#*=}
+				#opt=${OPTARG%=$file}
+				opt="$(printf "%s\n" "${OPTARG}" | cut -d'=' -f1 )" ; file="$(printf "%s\n" "${OPTARG}" | cut -d'=' -f2-)" 
+ 			   	;;
+			model) opt_model=true;;
+			lens) opt_lens=true;;
+			*)
+				if [ "$OPTERR" = 1 ] && [ "${optspec:0:1}" = ":" ]; then
+					echo "Unknown option --${OPTARG}" >&2
+				fi
+				exit 3
+				;;
+			esac;;
 		w) opt_wildlife=true;;
 		n) opt_nature=true;;
 		r) opt_region=true;;
@@ -39,12 +118,19 @@ do
 			;;
 		m) opt_model=true;;
 		l) opt_lens=true;;
+		h) 
+			showHelp
+			exit 0
+			;;
 		*)
-			echo "Unknow option '-$opt'" >&2
+			if [ "$OPTERR" != 1 ] || [ "${optspec:0:1}" = ":" ]; then
-			exit -1;;
+				echo "Non-option argument: '-${OPTARG}'" >&2
+			fi
+			exit 4
+			;;
 	esac
 done
-
+#shift $((OPTIND-1))
 
 if [ $opt_lens = true ] || [ $opt_model = true ] || [ $opt_region = true ] || [ $opt_nature = true ] || [ $opt_wildlife = true ]; then
 	opt_all=false
@@ -69,7 +155,7 @@ if ! command -v exiftool &> /dev/null; then
 	exit 1
 fi
 
-[ ! -f "$file"  ] && echo -e "${bold}${red}No input file !${reset}" && exit 1
+[ ! -f "$file"  ] && echo -e "${bold}${red}No input file !${reset}" && exit 2
 
 # dico français / anglais
 
@@ -109,7 +195,7 @@ k=$(echo "$exif" | sed -n '/^Keywords/p' | awk -F":" '{print $2}' | sed 's/^ *//
 if [ -z "$k" ]; then
 	echo -e "${bold}${red}No Keywords found !${reset}"
 	echo "Quit."
-	exit 1
+	exit 5
 fi