Cicero 0.13.0 ☘️

This 0.13.0 release is focused on overhauling error handling and improved error reporting. Errors use a new type hierarchy which works harmoniously across Cicero, Composer Concerto and Ergo! 🎶

It also includes some bug fixes, and integrates new Ergo features: array index access, a new logging expression, support for compiler warnings and new built-in functions.

Note: While this release is backward compatible from a templates support perspective, it may require changes to application code which relies on the Cicero JavaScript API

Bug fixes

• 🐞 Parsing of date time without format is now consistent with that of the same date time with the default US format MM/DD/YYYY (#375)

Ergo

New expressions 🎁

• 🔢 Array index. You can now write e1[e2] to access the value of array e1 at (integer) index e2. This return an option for type safety. (accordproject/ergo#561)
• 📝 Logging. You can now write info(e1); e2 which indicate you want to print the value of e1 then evaluate e2. The semantic is defined as a no-op (so the compiler is free to optimise aggressively in some environments), but this can be useful when authoring template logic. This is an experimental feature, feedback is welcome (accordproject/ergo#121)

Built-in functions

• 📐 New length function returns the length of a string (accordproject/ergo#615)

Errors 🐛

• 📍 Better location information in type errors over built-in operators (accordproject/ergo#622)
• 🌷 Underlining errors does not look strange when tab characters are present (accordproject/ergo#626)
• 🌷Better type errors for missing fields (accordproject/ergo#629)