Formula
Added in v0.3. Formula is for making creating transactions with patterns easier, such as Netflix and Spotify subscriptions, Uber and Lyft bills, even salaries.
Like account replacement, a config is needed before start using formula. The formula config is key: value
format. The key is the formula name (can't be a command name), the value is the content to parse with Costflow Syntax. Some variables are allowed in the value. The variable should be wrapped in double curly braces {{ }}
. The variables allowed in current version:
- amount: the first number in the input. You can use some basic math operations with the amount, e.g.
amount * 0.8
; - pre: the original input excludes the formula name;
More variables will be supported in future versions.
The way formula works is: convert the formula based on its config, then parse the value with Costflow Syntax all over again. So the value should follow Costflow Syntax too.
For example, we wrote a formula config for AWS transaction:
If we run f aws 60
or just aws 60
in Costflow Hub / CLI / Playground, the formula will run like this:
Formula is created for transactions, but it can be used for other directives. Here are some formula config examples: