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devmode.R
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devmode.R
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#' Shiny Developer Mode
#'
#' @description `r lifecycle::badge("experimental")`
#'
#' Developer Mode enables a number of [options()] to make a developer's life
#' easier, like enabling non-minified JS and printing messages about
#' deprecated functions and options.
#'
#' Shiny Developer Mode can be enabled by calling `devmode(TRUE)` and disabled
#' by calling `devmode(FALSE)`.
#'
#' Please see the function descriptions for more details.
#'
#' @describeIn devmode Function to set two options to enable/disable Shiny
#' Developer Mode and Developer messages
#' @param devmode Logical value which should be set to `TRUE` to enable Shiny
#' Developer Mode
#' @param verbose Logical value which should be set to `TRUE` display Shiny
#' Developer messages
#' @export
#' @examples
#' # Enable Shiny Developer mode
#' devmode()
#'
devmode <- function(
devmode = getOption("shiny.devmode", TRUE),
verbose = getOption("shiny.devmode.verbose", TRUE)
) {
options(
shiny.devmode = devmode,
shiny.devmode.verbose = verbose
)
}
#' @describeIn devmode Determines if Shiny is in Developer Mode. If the
#' `getOption("shiny.devmode")` is set to `TRUE` and not in testing inside
#' `testthat`, then Shiny Developer Mode is enabled.
#' @section Avoiding direct dependency on shiny:
#'
#' The methods explained in this help file act independently from the rest of
#' Shiny but are included to provide blue prints for your own packages. If
#' your package already has (or is willing to take) a dependency on Shiny, we
#' recommend using the exported Shiny methods for consistent behavior. Note
#' that if you use exported Shiny methods, it will cause the Shiny package to
#' load. This may be undesirable if your code will be used in (for example) R
#' Markdown documents that do not have a Shiny runtime (`runtime: shiny`).
#'
#' If your package can **not** take a dependency on Shiny, we recommending
#' re-implementing these two functions:
#'
#' \enumerate{
#' \item `in_devmode()`:
#'
#' This function should return `TRUE` if `getOption("shiny.devmode")` is set.
#' In addition, we strongly recommend that it also checks to make sure
#' `testthat` is not testing.
#'
#' ```r
#' in_devmode <- function() {
#' isTRUE(getOption("shiny.devmode", FALSE)) &&
#' !identical(Sys.getenv("TESTTHAT"), "true")
#' }
#' ```
#'
#' \item `get_devmode_option(name, default, devmode_default, devmode_message)`:
#'
#' This function is similar to `getOption(name, default)`, but when the option
#' is not set, the default value changes depending on the Dev Mode.
#' `get_devmode_option()` should be implemented as follows:
#'
#' * If not in Dev Mode:
#' * Return `getOption(name, default)`.
#' * If in Dev Mode:
#' * Get the global option `getOption(name)` value.
#' * If the global option value is set:
#' * Return the value.
#' * If the global option value is not set:
#' * Notify the developer that the Dev Mode default value will be used.
#' * Return the Dev Mode default value.
#'
#' When notifying the developer that the default value has changed, we strongly
#' recommend displaying a message (`devmode_message`) to `stderr()` once every 8
#' hours using [rlang::inform()]. This will keep the author up to date as to
#' which Dev Mode options are being altered. To allow developers a chance to
#' disable Dev Mode messages, the message should be skipped if
#' `getOption("shiny.devmode.verbose", TRUE)` is not `TRUE`.
#'
#' ```r
#' get_devmode_option <- function(name, default = NULL, devmode_default, devmode_message) {
#' if (!in_devmode()) {
#' # Dev Mode disabled, act like `getOption()`
#' return(getOption(name, default = default))
#' }
#'
#' # Dev Mode enabled, update the default value for `getOption()`
#' getOption(name, default = {
#' # Notify developer
#' if (
#' !missing(devmode_message) &&
#' !is.null(devmode_message) &&
#' getOption("shiny.devmode.verbose", TRUE)
#' ) {
#' rlang::inform(
#' message = devmode_message,
#' .frequency = "regularly",
#' .frequency_id = devmode_message,
#' .file = stderr()
#' )
#' }
#'
#' # Return Dev Mode default value `devmode_default`
#' devmode_default
#' })
#' }
#' ```
#' }
#'
#' The remaining functions in this file are used for author convenience and are
#' not recommended for all reimplementation situations.
#' @export
#' @examples
#' in_devmode() # TRUE/FALSE?
#'
in_devmode <- function() {
isTRUE(getOption("shiny.devmode", FALSE)) &&
# !testthat::is_testing()
!identical(Sys.getenv("TESTTHAT"), "true")
}
#' @describeIn devmode Temporarily set Shiny Developer Mode and Developer
#' message verbosity
#' @param code Code to execute with the temporary Dev Mode options set
#' @export
#' @examples
#' # Execute code in a temporary shiny dev mode
#' with_devmode(TRUE, in_devmode()) # TRUE
#'
with_devmode <- function(
devmode,
code,
verbose = getOption("shiny.devmode.verbose", TRUE)
) {
withr::with_options(
list(
shiny.devmode = devmode,
shiny.devmode.verbose = verbose
),
code
)
}
#' @describeIn devmode If Shiny Developer Mode and verbosity are enabled,
#' displays a message once every 8 hrs (by default)
#' @param message Developer Mode message to be sent to [rlang::inform()]
#' @param .frequency Frequency of the Developer Mode message used with
#' [rlang::inform()]. Defaults to once every 8 hours.
#' @param .frequency_id [rlang::inform()] message identifier. Defaults to
#' `message`.
#' @param .file Output connection for [rlang::inform()]. Defaults to [stderr()]
#' @param ... Parameters passed to [rlang::inform()]
devmode_inform <- function(
message,
.frequency = "regularly",
.frequency_id = message,
.file = stderr(),
...
) {
if (!(
in_devmode() &&
isTRUE(getOption("shiny.devmode.verbose", TRUE))
)) {
return()
}
if (is.null(message)) {
return()
}
rlang::inform(
message = paste0("shiny devmode - ", message),
.frequency = .frequency,
.frequency_id = .frequency_id,
.file = .file,
...
)
}
registered_devmode_options <- NULL
on_load({
registered_devmode_options <- Map$new()
})
#' @describeIn devmode Registers a Shiny Developer Mode option with an updated
#' value and Developer message. This registration method allows package
#' authors to write one message in a single location.
#'
#' For example, the following Shiny Developer Mode options are registered:
#'
#' ```r
#' # Reload the Shiny app when a sourced R file changes
#' register_devmode_option(
#' "shiny.autoreload",
#' "Turning on shiny autoreload. To disable, call `options(shiny.autoreload = FALSE)`",
#' devmode_default = TRUE
#' )
#'
#' # Use the unminified Shiny JavaScript file, `shiny.js`
#' register_devmode_option(
#' "shiny.minified",
#' "Using full shiny javascript file. To use the minified version, call `options(shiny.minified = TRUE)`",
#' devmode_default = FALSE
#' )
#'
#' # Display the full stack trace when errors occur during Shiny app execution
#' register_devmode_option(
#' "shiny.fullstacktrace",
#' "Turning on full stack trace. To disable, call `options(shiny.fullstacktrace = FALSE)`",
#' devmode_default = TRUE
#' )
#' ```
#'
#' Other known, non-Shiny Developer Mode options:
#'
#' * Sass:
#' ```r
#' # Display the full stack trace when errors occur during Shiny app execution
#' register_devmode_option(
#' "sass.cache",
#' "Turning off sass cache. To use default caching, call `options(sass.cache = TRUE)`",
#' devmode_default = FALSE
#' )
#' ```
#'
#' @param name Name of option to look for in `options()`
#' @param default Default value to return if `in_devmode()` returns
#' `TRUE` and the specified option is not set in [`options()`].
#' @param devmode_message Message to display once every 8 hours when utilizing
#' the `devmode_default` value. If `devmode_message` is missing, the
#' registered `devmode_message` value be used.
#' @param devmode_default Default value to return if `in_devmode()` returns
#' `TRUE` and the specified option is not set in [`options()`]. For
#' `get_devmode_option()`, if `devmode_default` is missing, the
#' registered `devmode_default` value will be used.
#' @export
#' @examples
#' # Ex: Within shiny, we register the option "shiny.minified"
#' # to default to `FALSE` when in Dev Mode
#' \dontrun{register_devmode_option(
#' "shiny.minified",
#' devmode_message = paste0(
#' "Using full shiny javascript file. ",
#' "To use the minified version, call `options(shiny.minified = TRUE)`"
#' ),
#' devmode_default = FALSE
#' )}
#'
register_devmode_option <- function(
name,
devmode_message = NULL,
devmode_default = NULL
) {
if (!is.null(devmode_message)) {
stopifnot(length(devmode_message) == 1 && is.character(devmode_message))
}
registered_devmode_options$set(
name,
list(devmode_default = devmode_default, devmode_message = devmode_message)
)
}
#' @describeIn devmode Provides a consistent way to change the expected
#' [getOption()] behavior when Developer Mode is enabled. This method is very
#' similar to [getOption()] where the globally set option takes precedence.
#' See section "Avoiding direct dependency on shiny" for
#' `get_devmode_option()` implementation details.
#'
#' **Package developers:** Register your Dev Mode option using
#' `register_devmode_option()` to avoid supplying the same `devmode_default`
#' and `devmode_message` values throughout your package. (This requires a
#' \pkg{shiny} dependency.)
#' @export
#' @examples
#' # Used within `shiny::runApp(launch.browser)`
#' get_devmode_option("shiny.minified", TRUE) # TRUE if Dev mode is off
#' is_minified <- with_devmode(TRUE, {
#' get_devmode_option("shiny.minified", TRUE)
#' })
#' is_minified # FALSE
#'
get_devmode_option <- function(
name,
default = NULL,
devmode_default = missing_arg(),
devmode_message = missing_arg()
) {
getOption(
name,
local({
if (!in_devmode()) {
# typical case
return(default)
}
info <- registered_devmode_options$get(name)
if (is.null(info)) {
# Not registered,
# Warn and return default value
rlang::warn(
message = paste0(
"`get_devmode_option(name)` could not find `name = \"", name, "\"`. ",
"Returning `default` value"
)
)
return(default)
}
# display message
devmode_inform(
maybe_missing(
# use provided `devmode_message` value
devmode_message,
# If `devmode_message` is missing, display registered `devmode_message`
default = info$devmode_message
)
)
# return value
maybe_missing(
# use provided `devmode_default` value
devmode_default,
# if `devmode_default` is missing, provide registered `devmode_default`
default = info$devmode_default
)
})
)
}
on_load({
register_devmode_option(
"shiny.autoreload",
"Turning on shiny autoreload. To disable, call `options(shiny.autoreload = FALSE)`",
TRUE
)
register_devmode_option(
"shiny.minified",
"Using full shiny javascript file. To use the minified version, call `options(shiny.minified = TRUE)`",
FALSE
)
register_devmode_option(
"shiny.fullstacktrace",
"Turning on full stack trace. To disable, call `options(shiny.fullstacktrace = FALSE)`",
TRUE
)
})