feat: POSIX compatibility

piglet

@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/sh
 
 # piglet - Porkbun DNS API client.
 #
@@ -27,17 +27,17 @@
 #
 # For more information, please refer to <http://unlicense.org/>
 
-piglet_version='0.1'
+piglet_version='0.1.1'
 piglet_conf="${HOME}/.config/piglet.conf"
 
 print_help() {
-    cat <<- EOF
+cat <<- 'EOF'
 Porkbun DNS API client.
 
-	/\\ ____ /\\
+/\ ____ /\
-	\\/      \\/  <OINK!>
+\/      \/  <OINK!>
 | *(00)* | /
-	\\        /&"
+\        /&"
  |_|--|_|
 
 Usage: piglet [-cdjhv] command [arg=value ...]
@@ -67,7 +67,7 @@ print_help() {
     exit 0
 }
 
-print_help::create() {
+print_help_create() {
     cat <<- EOF
 Create a DNS record.
 
@@ -91,7 +91,7 @@ print_help::create() {
     exit 0
 }
 
-print_help::edit() {
+print_help_edit() {
     cat <<- EOF
 Edit a DNS record by Domain and ID.
 
@@ -117,7 +117,7 @@ print_help::edit() {
     exit 0
 }
 
-print_help::delete() {
+print_help_delete() {
     cat <<- EOF
 Delete a specific DNS record by Doman and ID..
 
@@ -130,7 +130,7 @@ print_help::delete() {
     exit 0
 }
 
-print_help::retrieve() {
+print_help_retrieve() {
     cat <<- EOF
 Retrieve all editable DNS records associated with a domain or a single record
 for a particular record ID.
@@ -151,69 +151,51 @@ print_help::retrieve() {
 #               API methods                 #
 # ----------------------------------------- #
 
-api::create() {
+api_create() {
     # Create DNS record.
     # See: https://porkbun.com/api/json/v3/documentation#DNS%20Create%20Record
 
-    # Usage: api::create domain name type content ttl prio
+    # Usage: api_create domain name type content ttl prio
 
-    local Domain="$1"
+    curl -sS -X POST https://porkbun.com/api/json/v3/dns/create/"$1" \
-    local Name="$2"
-    local Type="$3"
-    local Content="$4"
-    local TTL="$5"
-    local Prio="$6"
-
-    curl -sS -X POST https://porkbun.com/api/json/v3/dns/create/$Domain \
         --data '{
             "secretapikey": "'"$Secret_API_Key"'",
             "apikey": "'"$API_Key"'",
-            "name": "'"$Name"'",
+            "name": "'"$2"'",
-            "type": "'"$Type"'",
+            "type": "'"$3"'",
-            "content": "'"$Content"'",
+            "content": "'"$4"'",
-            "ttl": "'"$TTL"'",
+            "ttl": "'"$5"'",
-            "prio": "'"$Prio"'"
+            "prio": "'"$6"'"
         }'
     echo # just print new line
 }
 
-api::edit() {
+api_edit() {
     # Edit DNS record by Domain and ID.
     # See: https://porkbun.com/api/json/v3/documentation#DNS%20Edit%20Record%20by%20Domain%20and%20ID
 
-    # Usage: api::edit doamin id name type content ttl prio
+    # Usage: api_edit doamin id name type content ttl prio
 
-    local Domain="$1"
+    curl -sS -X POST https://porkbun.com/api/json/v3/dns/edit/"$1"/"$2" \
-    local ID="$2"
-    local Name="$3"
-    local Type="$4"
-    local Content="$5"
-    local TTL="$6"
-    local Prio="$7"
-
-    curl -sS -X POST https://porkbun.com/api/json/v3/dns/edit/$Domain/$ID \
         --data '{
             "secretapikey": "'"$Secret_API_Key"'",
             "apikey": "'"$API_Key"'",
-            "name": "'"$Name"'",
+            "name": "'"$3"'",
-            "type": "'"$Type"'",
+            "type": "'"$4"'",
-            "content": "'"$Content"'",
+            "content": "'"$5"'",
-            "ttl": "'"$TTL"'",
+            "ttl": "'"$6"'",
-            "prio": "'"$Prio"'"
+            "prio": "'"$7"'"
         }'
     echo # just print new line
 }
 
-api::delete() {
+api_delete() {
     # Delete DNS record.
     # See: https://porkbun.com/api/json/v3/documentation#DNS%20Delete%20Record%20by%20Domain%20and%20ID
 
-    # Usage: api::delete domain id
+    # Usage: api_delete domain id
 
-    local Domain="$1"
+    curl -sS -X POST https://porkbun.com/api/json/v3/dns/delete/"$1"/"$2" \
-    local ID="$2"
-
-    curl -sS -X POST https://porkbun.com/api/json/v3/dns/delete/$Domain/$ID \
         --data '{
             "secretapikey": "'"$Secret_API_Key"'",
             "apikey": "'"$API_Key"'"
@@ -221,23 +203,19 @@ api::delete() {
     echo # just print new line
 }
 
-api::retrieve() {
+api_retrieve() {
     # Retrieve DNS records.
     # See: https://porkbun.com/api/json/v3/documentation#DNS%20Retrieve%20Records%20by%20Domain%20or%20ID
 
-    # Usage: api::retrieve domain id
+    # Usage: api_retrieve domain id
-    # Function arguments:
-    #   $1      domain name
-    #   $2      DNS record ID
 
-    local target=
+    _target="$1"
 
-    target="$1"
+    if [ "$#" -eq 2 ]; then
-    if [[ "$1" && "$2" ]]; then
+        target="$1/$2"
-        target="${1}/${2}"
     fi
 
-    curl -sS -X POST https://porkbun.com/api/json/v3/dns/retrieve/$target \
+    curl -sS -X POST https://porkbun.com/api/json/v3/dns/retrieve/"$target" \
         --data '{
             "secretapikey": "'"$Secret_API_Key"'",
             "apikey": "'"$API_Key"'"
@@ -251,37 +229,44 @@ api::retrieve() {
 
 _init_piglet() {
     # Source configuration file
+    # shellcheck disable=SC1090
     . "$piglet_conf"
 
-    [[ "$API_Key" && "$Secret_API_Key" ]] || {
+    if [ -z "$API_Key" ] || [ -z "$Secret_API_Key" ]; then
         echo "Bad API credentials. Please check the ${piglet_conf}. " \
             "Run 'piglet config' to create new config file." >&2; exit 1
-    }
+    fi
-    [ "$domain" ] || { echo 'Domain name is not set' >&2; exit 1; }
+
+    if [ -z "$domain" ]; then
+        echo 'Domain name is not set' >&2; exit 1;
+    fi
 }
 
 piglet_config() {
-    echo -e "Enter Porkbun DNS API keys. Press ^C to cancel.\n" \
+    mkdir -p "$HOME"/.config
-        "\bHelp: <https://kb.porkbun.com/article/190-getting-started-with-the-porkbun-dns-api>\n"
+
-    read -p 'API_Key: ' api_key
+    printf '%s\n%s\n' \
-    read -p 'Secret_API_Key: ' secret_api_key
+        "Enter Porkbun DNS API keys. Press ^C to cancel." \
+        "Help: https://kb.porkbun.com/article/190-getting-started-with-the-porkbun-dns-api"
+
+    printf '%s ' 'API_Key:'; read -r api_key
+    printf '%s ' 'Secret_API_Key:'; read -r secret_api_key
+
     cat > "$piglet_conf" <<- EOF
 # Porkbun DNS API credentials
 API_Key=$api_key
 Secret_API_Key=$secret_api_key
 EOF
-    echo -e "Config saved as $piglet_conf"
+    printf 'Config saved as %s\n' "$piglet_conf"
 }
 
 piglet_create() {
-    local name= type= content= ttl= prio=
+    while [ "$#" -ne 0 ]; do
-
-    while (( "$#" )); do
         case "$1" in
             -c|--config|--config=*) opts "$1" "$2"; piglet_conf="$val"; shift "$sft";;
             -d|--domain|--domain=*) opts "$1" "$2"; domain="$val"; shift "$sft";;
             -j|--json)  raw_json=1; shift;;
-            -h|--help) print_help::create;;
+            -h|--help) print_help_create;;
             name=*) name="${1##*=}"; shift;;
             type=*) type="${1##*=}"; shift;;
             content=*) content="${1##*=}"; shift;;
@@ -294,18 +279,16 @@ piglet_create() {
 
     _init_piglet
 
-    api::create "$domain" "$name" "$type" "$content" "$ttl" "$prio"
+    api_create "$domain" "$name" "$type" "$content" "$ttl" "$prio"
 }
 
 piglet_edit() {
-    local record_id= name= type= content= ttl= prio=
+    while [ "$#" -ne 0 ]; do
-
-    while (( "$#" )); do
         case "$1" in
             -c|--config|--config=*) opts "$1" "$2"; piglet_conf="$val"; shift "$sft";;
             -d|--domain|--domain=*) opts "$1" "$2"; domain="$val"; shift "$sft";;
             -j|--json)  raw_json=1; shift;;
-            -h|--help) print_help::edit;;
+            -h|--help) print_help_edit;;
             id=*) record_id="${1##*=}"; shift;;
             name=*) name="${1##*=}"; shift;;
             type=*) type="${1##*=}"; shift;;
@@ -319,18 +302,16 @@ piglet_edit() {
 
     _init_piglet
 
-    api::edit "$domain" "$record_id" "$name" "$type" "$content" "$ttl" "$prio"
+    api_edit "$domain" "$record_id" "$name" "$type" "$content" "$ttl" "$prio"
 }
 
 piglet_delete() {
-    local record_id=
+    while [ "$#" -ne 0 ]; do
-
-    while (( "$#" )); do
         case "$1" in
             -c|--config|--config=*) opts "$1" "$2"; piglet_conf="$val"; shift "$sft";;
             -d|--domain|--domain=*) opts "$1" "$2"; domain="$val"; shift "$sft";;
             -j|--json)  raw_json=1; shift;;
-            -h|--help) print_help::delete;;
+            -h|--help) print_help_delete;;
             id=*) record_id="${1##*=}"; shift;;
             -*) echo "Unknown option: $1" >&2; exit 1;;
             *) echo "Unknown key: $1" >&2; exit 1;;
@@ -339,18 +320,16 @@ piglet_delete() {
 
     _init_piglet
 
-    api::delete "$domain" "$record_id"
+    api_delete "$domain" "$record_id"
 }
 
 piglet_retrieve() {
-    local json_out= record_id=
+    while [ "$#" -ne 0 ]; do
-
-    while (( "$#" )); do
         case "$1" in
             -c|--config|--config=*) opts "$1" "$2"; piglet_conf="$val"; shift "$sft";;
             -d|--domain|--domain=*) opts "$1" "$2"; domain="$val"; shift "$sft";;
             -j|--json)  raw_json=1; shift;;
-            -h|--help) print_help::retrieve;;
+            -h|--help) print_help_retrieve;;
             id=*) record_id="${1##*=}"; shift;;
             -*) echo "Unknown option: $1" >&2; exit 1;;
             *) echo "Unknown key: $1" >&2; exit 1;;
@@ -359,11 +338,11 @@ piglet_retrieve() {
 
     _init_piglet
 
-    json_out="$(api::retrieve "$domain" "$record_id")"
+    json_out="$(api_retrieve "$domain" "$record_id")"
 
     if ! hash jq 2>/dev/null; then
         raw_json=1
-        echo -e "Install jq to enable table view."
+        echo "Install jq to enable table view." >&2
     fi
 
     if [ "$raw_json" ]; then
@@ -390,34 +369,39 @@ opts() {
     #   $val - option value.
     #   $sft - value for shift.
 
-    if [[ "$1" =~ .+=.+ ]]; then
+    opt="${1%%=*}"; val="${1##*=}"; sft=1
-        opt="${1%%=*}"; val="${1#*=}"; sft=1
+
-    elif [[ ! "$1" =~ .+=$ ]] && \
+    if [ "$opt" = "$val" ]; then
-         [ "$2" ] && [ "${2:0:1}" != "-" ]
+        if [ -n "$2" ] && [ "$(echo "$2" | cut -c1-1)" != "-" ]; then
-    then
+            val="$2"; sft=2
-        opt="$1"; val="$2"; sft=2
         else
-        opt="$1"
+            unset val
-        if [[ "$1" =~ .+=$ ]]; then opt="${1:0: -1}"; fi
+        fi
-        echo "Missing argument for $opt" >& /dev/null; exit 1
+    fi
+
+    if [ -z "$val" ]; then
+        printf 'Missing argument for option %s\n' "$opt" >&2; exit 1
     fi
 }
 
-[[ "$@" ]] || print_help
+if [ "$#" -eq 0 ]; then
+    print_help
+fi
 
 # Split combined short options, e.g. '-abc' to '-a' '-b' '-c'
 for args in "$@"; do
     shift
     case "$args" in
         --*) set -- "$@" "$args";;  # save long options
-        -*) args="$(echo "${args:1}" | grep -o . | xargs -I {} echo -n '-{} ')"
+        -*) args="$(echo "${args#-}" | grep -o . | xargs -I {} echo -n '-{} ')"
+            # shellcheck disable=SC2086
             set -- "$@" $args;;
         *) set -- "$@" "$args";;  # save positional arguments
     esac
 done
 
 # Final arguments parser
-while (( "$#" )); do
+while [ "$#" -ne 0 ]; do
     case "$1" in
         -c|--config|--config=*) opts "$1" "$2"; piglet_conf="$val"; shift "$sft";;
         -d|--domain|--domain=*) opts "$1" "$2"; domain="$val"; shift "$sft";;