edit-file

#!/bin/bash

function appendHelp {
    echo "Syntax: edit-file <file> <search/placement> [placement]"
}

function appendLine {
    FILE="$1"
    SEARCH="$2"
    PLACE="$3"

    echo SEARCH: "$SEARCH"
    echo FILE: "$FILE"
    echo PLACEMENT: "$PLACE"

    if [ -z "$SEARCH" ]; then
        appendHelp
        exit 1    
    fi

    if [ -z "$FILE" ]; then
        appendHelp
        exit 1 
    fi

    if [ -z "$PLACE" ]; then
        PLACE="$SEARCH"
    fi

    echo Try append "$SEARCH" to file "$FILE"
    if [ -f "$FILE" ]; then
        grep -qxF "$SEARCH" "$FILE" || echo "$PLACE" >> "$FILE"
    else
        echo create file "$FILE"
        echo "$PLACE" > "$FILE"
    fi
}

function replaceHelp {
    echo "Syntax: edit-file <file> <search> <replacement>"
}

function replaceLine {
    FILE="$1"
    SEARCH="$2"
    PLACE="$3"

    echo SEARCH: "$SEARCH"
    echo FILE: "$FILE"
    echo PLACEMENT: "$PLACE"

    if [ -z "$SEARCH" ]; then
        replaceHelp
        exit 1    
    fi

    if [ -z "$FILE" ]; then
        replaceHelp
        exit 1 
    fi

    if [ -z "$PLACE" ]; then
        replaceHelp
        exit 1 
    fi

    echo Try replace "$SEARCH" in file "$FILE"
    if [ -f "$FILE" ]; then
        sed -i "s|$SEARCH|$PLACE|g" "$FILE"
    fi
}

function removeHelp {
    echo "Syntax: edit-file remove <file> <search>"
}

function removeLine {
    FILE="$1"
    SEARCH="$2"

    if [ -z "$SEARCH" ]; then
        replaceHelp
        exit 1    
    fi

    if [ -z "$FILE" ]; then
        replaceHelp
        exit 1 
    fi

    echo Try remove "$SEARCH" in file "$FILE"
    if [ -f "$FILE" ]; then
        sed -i "s|$SEARCH||g" "$FILE"
    fi
}

case $1 in
	append)
		appendLine "$2" "$3" "$4"
		;;

	replace)
		replaceLine "$2" "$3" "$4"
		;;

	remove)
		removeLine "$2" "$3"
		;;

	*)
		echo $"Usage: edit-file {append|replace|remove} <file> Options..."
		exit 1
esac