inline-markup: CLI inline markup
In cliapp: Create Rich Command Line Applications

Description Command substitution Classes Examples

CLI inline markup

All text emitted by cliapp supports glue interpolation. Expressions enclosed by braces will be evaluated as R code. See glue::glue() for details.

In addition to regular glue interpolation, cliapp can also add classes to parts of the text, and these classes can be used in themes. For example

1	cli_text("This is {emph important}.")

adds a class to the "important" word, class "emph". Note that in this cases the string within the braces is not a valid R expression. If you want to mix classes with interpolation, add another pair of braces:

1 2	adjective <- "great" cli_text("This is {emph {adjective}}.")

An inline class will always create a span element internally. So in themes, you can use the span.emph CSS selector to change how inline text is emphasized:

1
2
3

cli_div(theme = list(span.emph = list(color = "red")))
adjective <- "nice and red"
cli_text("This is {emph {adjective}}.")

The default theme defines the following inline classes:

emph for emphasized text.
strong for strong importance.
code for a piece of code.
pkg for a package name.
fun for a function name.
arg for a function argument.
key for a keyboard key.
file for a file name.
path for a path (essentially the same as file).
email for an email address.
url for a URL.
var for a variable name.
envvar for the name of an environment variable.

See examples below.

You can simply add new classes by defining them in the theme, and then using them, see the example below.

## Some inline markup examples
cli_ul()
cli_it("{emph Emphasized} text")
cli_it("{strong Strong} importance")
cli_it("A piece of code: {code sum(a) / length(a)}")
cli_it("A package name: {pkg cliapp}")
cli_it("A function name: {fun cli_text}")
cli_it("A function argument: {arg text}")
cli_it("A keyboard key: press {key ENTER}")
cli_it("A file name: {file /usr/bin/env}")
cli_it("An email address: {email bugs.bunny@acme.com}")
cli_it("A URL: {url https://acme.com}")
cli_it("A variable name: {var mtcars}")
cli_it("An environment variable: {envvar R_LIBS}")
cli_end()

## Adding a new class
cli_div(theme = list(
  span.myclass = list(color = "lightgrey"),
  "span.myclass::before" = list(content = "["),
  "span.myclass::after" = list(content = "]")))
cli_text("This is {myclass in brackets}.")
cli_end()