Gwyneira - asset constants generator

gwyneira.sh

#!/bin/bash

set -e

CATALOGS=$@
ASSETS=()

MAKE_SPACING() {
    local DEPTH=$1
    local STEP="    "

    local SPACING=""
    for (( I=0; I<$DEPTH; I++ )); do
        SPACING="$STEP$SPACING"
    done
    echo "$SPACING"
}

HANDLE_KEYWORD() {
    case $1 in
        "continue"|"switch"|"default"|"static"|"final"|"class"|"struct"|"import"|"extension"|"return"|"try"|"break"|"case"|"super"|"private"|"public"|"internal"|"guard"|"self
"|"while"|"catch"|"true"|"false"|"override"|"lazy")
            echo "\`$1\`";;
        *)
            echo $1;;
    esac
}

LOWERCASE_FIRST_LETTER() {
    echo "$(tr '[:upper:]' '[:lower:]' <<< ${1:0:1})${1:1}"
}

MAKE_ENTRY() {
    local KEY="$1"
    local ENTRY="$2"
    local DEPTH="$3"

    local SPACING=$(MAKE_SPACING $DEPTH)
    local NAME="${ENTRY//[[:blank:]]/}" 
    NAME=$(LOWERCASE_FIRST_LETTER $NAME)
    NAME=${NAME//%[@d]/}
    NAME=$(HANDLE_KEYWORD $NAME)
    
    echo "${SPACING}static var $NAME: UIImage { return $ENTITY_TITLE.image(\"$KEY\") }"
}

MAKE_ENTRIES() {
    local DEPTH=$1

    local HIERARCHY=()
    local HIERARCHY_DEPTH=0

    for ASSET in "${ASSETS[@]}"; do
        local PATH_COMPONENTS=()
        IFS='/'
        read -ra PATH_COMPONENTS <<< "$ASSET"
        unset IFS
        
        local KEY=${PATH_COMPONENTS[${#PATH_COMPONENTS[@]}-1]}
        
        local COMPONENTS=()
        IFS='.'
        read -ra COMPONENTS <<< "$KEY"
        unset IFS

        local LENGTH=${#COMPONENTS[@]}
        local NEW_HIERARCHY_DEPTH=$(expr $LENGTH - 1)
        local NEW_HIERARCHY=(${COMPONENTS[@]:0:$NEW_HIERARCHY_DEPTH})
        local ENTRY=${COMPONENTS[$NEW_HIERARCHY_DEPTH]}
        
        local MAX_COMMON_HIERARCHY_DEPTH=$(( $NEW_HIERARCHY_DEPTH<$HIERARCHY_DEPTH ? $NEW_HIERARCHY_DEPTH : $HIERARCHY_DEPTH ))
        local COMMON_HIERARCHY_DEPTH=0
        for (( I=0; I<$MAX_COMMON_HIERARCHY_DEPTH; I++ )); do
            if [[ "${HIERARCHY[$I]}" == "${NEW_HIERARCHY[$I]}" ]]; then
                COMMON_HIERARCHY_DEPTH=$(expr $COMMON_HIERARCHY_DEPTH + 1)
            else
                break
            fi    
        done
        
        local BRACKETS_TO_CLOSE=$(expr $HIERARCHY_DEPTH - $COMMON_HIERARCHY_DEPTH)
        for (( I=$HIERARCHY_DEPTH-1; I>=$COMMON_HIERARCHY_DEPTH; I-- )); do
            local SPACING=$(MAKE_SPACING $(expr $I + $DEPTH))
            echo "${SPACING}}"
        done

        for (( I=$COMMON_HIERARCHY_DEPTH; I<$NEW_HIERARCHY_DEPTH; ++I )); do
            local SPACING=$(MAKE_SPACING $(expr $I + $DEPTH))
            echo "${SPACING}enum ${COMPONENTS[$I]} {"
        done

        local ENTRY_DEPTH=$(expr $NEW_HIERARCHY_DEPTH + $DEPTH)
        echo "$(MAKE_ENTRY "$KEY" "$ENTRY" $ENTRY_DEPTH)"

        HIERARCHY=("${NEW_HIERARCHY[@]}")
        HIERARCHY_DEPTH=$NEW_HIERARCHY_DEPTH
    done

    for (( I=$HIERARCHY_DEPTH-1; I>=0; I-- )); do
        local SPACING=$(MAKE_SPACING $(expr $I + $DEPTH))
        echo "${SPACING}}"
    done
}

MAKE_CONSTANTS_FILE_FOR_CATALOG() {
    local CATALOG="$1"
 
    if [ ! -e "$CATALOG" ]; then
        return 0
    fi

    local OUTPUT_FOLDER="$(dirname "$CATALOG")"
    local OUTPUT_FILE_NAME="$(basename -- "$CATALOG")"
    local ENTITY_TITLE="${OUTPUT_FILE_NAME%.*}"
    local OUTPUT_FILE="$OUTPUT_FOLDER/$ENTITY_TITLE.swift"

    ASSETS=$(find -E "$CATALOG" -regex '^.*\.imageset')
    ASSETS=${ASSETS//"$CATALOG"\//}
    ASSETS=${ASSETS//\.imageset/}

    IFS=$'\n'
    ASSETS=($(sort <<< "${ASSETS[*]}"))
    unset IFS

    echo "//
// This file is generated by Gwyneira - asset constants generator.
//

import UIKit

enum $ENTITY_TITLE {
$(MAKE_ENTRIES 1)
}

extension $ENTITY_TITLE {

    static func image(_ name: String) -> UIImage {
        return UIImage(named: name, in: Bundle(for: ${ENTITY_TITLE}_BundleRef.self), with: nil)!
    }

}

private final class ${ENTITY_TITLE}_BundleRef {

}" > $OUTPUT_FILE

    return 0
}

for CATALOG in "$@"; do
    MAKE_CONSTANTS_FILE_FOR_CATALOG "$CATALOG"
done