Inzell

This project is meant to explore the kotlin programming language, learn about functional programming and implement a tiny spreadsheet-software.

Name

The name is intended to be a pun on a popular spreadsheet software. Also, Inzell is a city in Bavaria.

Concepts

The basic idea is that every column in a spreadsheet is usually some function. It may be a constant function, if only one value is needed. Input for the function is the row index. This allows to make a function that does anything with that value, counting for example.

The function may return values of any type:

fun f(n: Int): Any

Some of such functions are provided by StandardLibrary.kt.

Ech Column has a title which is used as a header, and a function to compute its value. An example is:

Column("Number of CPUs", ::powerOfTwo)

Finally, a spreadsheet is built like so:

spreadsheet {
    column("Expenses", expenses)
    column("Share of Expense", ::shareOfExpense)
    column("Cost with (fictional) tax", ::expenseWithTaxes)
}

More Examples

See Inzell-Examples for more examples, also ones not in Kotlin.

Using the library

The maven artifacts are published to GitHub. Use the following coordinates for a jvm application:

<dependency>
  <groupId>com.github.fwilhe.inzell</groupId>
  <artifactId>inzell-jvm</artifactId>
  <version>LATEST_VERSION_HERE</version>
</dependency>

Be sure to configure the GitHub repo in maven.

The library depends on the Kotlin standard library.

Building

To install the library to your local Maven repo, type ./gradlew publishToMavenLocal in the project root.

License

This software is written by Florian Wilhelm and available under the MIT license (see LICENSE for details)