jpollard-github / replacer

Simple tool to replace values in a file with a file of key-value pairs, for deployments

replacer

Description

This is a simple tool to replace values in a file based on key-value pairs in another file. The replacements will be made in a third file. It is useful to have tools like this for automated deployment scenarios.

Usage

mvn clean package to create replacer.jar in target folder. You can then copy the jar to wherever you want to invoke it.

java -jar replacer.jar <key-value file> <original file> <new file>

You can test the application by cloning the repo, running mvn clean package, and then using the included sample testfiles.

java -jar target\replacer.jar kvp.testfile original.testfile output.testfile

Notes

The key value file should be in the form

KEY1=VALUE1
KEY2=VALUE2
etc.

The file to replace values should have the keys listed in the form

{{KEY1}} {{KEY2}}

For example, if the key value file was

MYSQL_HOST=127.0.0.1
MYSQL_DATABASE=testdb

and the file to replace value in has the text

Now I want to use the host {{MYSQL_HOST}} with database {{MYSQL_DATABASE}}.

Then the output would be

Now I want to use the host 127.0.0.1 with database testdb.

Future

I might add functionality to replace values in files based on environment variables, if needed.