Color palettes in print outputs

[GregorDeCillia]

Issue

Currently, the colors used in the print methods of STATcubeR only really work with dark editor themes. This is why there are setup-scripts like these to make the pkgdown-docs look nice despite having a light theme.

STATcubeR/R/zzz.R

Lines 15 to 17 in 4537d3e

	options(cli.theme = list(
	".field" = list("color" = "#0d0d73"),
	".code" = list("color" = "blue"),

STATcubeR/vignettes/R/setup.R

Lines 5 to 7 in 99659dc

	STATcubeR.schema_colors = list(
	"FOLDER" = "#4400cc", "DATABASE" = "#186868", "TABLE" = "#624918",
	"GROUP" = "#4400cc", "FIELD" = "cyan", "VALUESET" = "cadetblue",

Challenge

Since there is a substantial amount of R users using light editor themes, make sure that a freshly installed version of STATcubeR works with both light and dark editors. Additionaly, keep the current color palletes as a "dark-theme" and add some way to switch between the default theme and the dark theme. Simplify the pkgdown setup by just using the new default-theme.

Implementation

In order to make the theming system powerful engough to include all current "theme-adaptations" for pkgdown, it is necessary to provide

• color palettes for schema types
• color palettes for annotations (re-implement annotatons #39)
• override some {cli} options. (possibly a bad idea, TBD)

There is already some prototyping which uses theme-definitions in inst/themes/{theme}.json with the following structure.

{
  "description": "default theme for STATcubeR",
  "schema": {"FOLDER": "#4400cc", "DATABASE": "#186868", "TABLE": "#624918", "...": "..."},
  "annotations": ["#4400cc", "#186868", "#624918", "..."],
  "cli": {".field": {"color": "#0d0d73"}, "...": "..."}
}

Defaults

It would be possible to autodetect wether a light or dark mode is approprite via rstudioapi::getThemeInfo(). But this would be only applicable for rstudio users. It is probably better to provide a neutral theme, which works in dark and light editors as a default and make optimized themes for dark and light mode opt-in.

[GregorDeCillia]

It should be fairly straightforward to include a theme for terminals without color support. For example

{ "schema": ["bold", "bold", "..."], "annotations": ["underline", "italic", "bold", "..."] }