R/promises.R
In ArcadeAntics/this.path: Get Executing Script's Path
## these are expressions that are used in this package,
## but which are not expected to change value in a session,
## so we can evaluate them exactly once when needed
##
## if you've never heard of an R promise before, it's a mechanism for handling
## delayed argument evaluation and substitution. a promise consists of four
## things:
##
## * an expression
##
## * an environment in which the expression will be evaluated
##
## * value of evaluating said expression in said environment, initially empty
##
## * the number of attempts to evaluate the promise, used to detect recursive
## references and restarting interrupted promises
##
## it is called a promise because "I promise to evaluate this code in this
## environment if / / when requested"
##
## an object like an integer, a boolean, and a string will evaluate to itself.
## other objects like a symbol, a bytecode expression, or a call will evaluate
## the same as usual.
##
## if / / when the code has been evaluated, the value of the expression is
## stored inside the promise. this means the promise does not re-evaluate the
## same piece of code multiple times. for example:
##
## ```R
## delayedAssign("x", {
## writeLines("evaluating 'x'")
## 5 + 6
## })
## x
## x
## x
## ```
##
## which produces the following output:
##
## ```
## > delayedAssign("x", {
## + writeLines("evaluating 'x'")
## + 5 + 6
## + })
## > x
## evaluating 'x'
## [1] 11
## > x
## [1] 11
## > x
## [1] 11
## >
## ```
##
## you'll see that the expression `writeLines("evaluating 'x'")` is only
## evaluated once, as desired! you can use `ikws.debug::PRINFO()` to examine
## the state of the promise:
##
## ```R
## delayedAssign("x", {
## writeLines("evaluating 'x'")
## 5 + 6
## })
## ikws.debug::PRINFO(x)
## x
## ikws.debug::PRINFO(x)
## ```
##
## which produces the following output:
##
## ```
## > delayedAssign("x", {
## + writeLines("evaluating 'x'")
## + 5 + 6
## + })
## > ikws.debug::PRINFO(x)
## $PRCODE
## {
## writeLines("evaluating 'x'")
## 5 + 6
## }
##
## $PRENV
## <environment: R_GlobalEnv>
##
## $PREXPR
## {
## writeLines("evaluating 'x'")
## 5 + 6
## }
##
## $PRSEEN
## [1] 0
##
## > x
## evaluating 'x'
## [1] 11
## > ikws.debug::PRINFO(x)
## $PRCODE
## {
## writeLines("evaluating 'x'")
## 5 + 6
## }
##
## $PRENV
## NULL
##
## $PREXPR
## {
## writeLines("evaluating 'x'")
## 5 + 6
## }
##
## $PRSEEN
## [1] 0
##
## $PRVALUE
## [1] 11
##
## >
## ```
##
## "PRCODE", "PRENV", "PRVALUE", and "PRSEEN" were all mentioned earlier, but
## "PREXPR" has not been mentioned yet. if "PRCODE" is a bytecode, then
## "PREXPR" will be the uncompiled version of "PRCODE". in all other cases,
## they are identical.
##
## notice that "PRENV" is set to `NULL` once the promise has been evaluated,
## it's not very important right now to understand why, this has to do with
## garbage collection. this allows the garbage collector to collect
## environments which are no longer in use.
##
## "PRSEEN" was mentioned earlier, it is an integer used to determine if a
## promise leads to infinite recursion or has been interrupted and is being
## restarted. for example:
##
## ```R
## delayedAssign("x", withAutoprint({
## 5 + 6
## ikws.debug::PRINFO(x)
## x
## }))
## ikws.debug::PRINFO(x)
## try(x)
## ikws.debug::PRINFO(x)
## ```
##
## notice "PRSEEN" is 0 when `x` is not being evaluated, it is 1 when `x` is
## being evaluated, and it is 2 when `x` has been interrupted (by an error) and
## restarted:
##
## ```
## > ikws.debug::PRINFO(x)
## $PRCODE
## withAutoprint({
## 5 + 6
## ikws.debug::PRINFO(x)
## x
## })
##
## $PRENV
## <environment: R_GlobalEnv>
##
## $PREXPR
## withAutoprint({
## 5 + 6
## ikws.debug::PRINFO(x)
## x
## })
##
## $PRSEEN
## [1] 0
##
## > try(x)
## > 5 + 6
## [1] 11
## > ikws.debug::PRINFO(x)
## $PRCODE
## withAutoprint({
## 5 + 6
## ikws.debug::PRINFO(x)
## x
## })
##
## $PRENV
## <environment: R_GlobalEnv>
##
## $PREXPR
## withAutoprint({
## 5 + 6
## ikws.debug::PRINFO(x)
## x
## })
##
## $PRSEEN
## [1] 1
##
## > x
## Error in eval(ei, envir) :
## promise already under evaluation: recursive default argument reference or earlier problems?
## > ikws.debug::PRINFO(x)
## $PRCODE
## withAutoprint({
## 5 + 6
## ikws.debug::PRINFO(x)
## x
## })
##
## $PRENV
## <environment: R_GlobalEnv>
##
## $PREXPR
## withAutoprint({
## 5 + 6
## ikws.debug::PRINFO(x)
## x
## })
##
## $PRSEEN
## [1] 2
##
## >
## ```
##
## these promises are created when the package is built and installed. they are
## evaluated during the regular use of the package
delayedAssign(".OS_unix" , { .Platform$OS.type == "unix" })
delayedAssign(".OS_windows", { .Platform$OS.type == "windows" })
## we need to determine the type of GUI in use. unfortunately, .Platform$GUI is
## not good enough. for example, 'VSCode' and 'Jupyter' do not set
## .Platform$GUI, and 'RStudio' does not set .Platform$GUI until after the
## site-wide startup profile file, a user profile, and the function .First()
## have been run (see ?Startup).
##
## as such, I've made my own ways of determining the type of GUI in use
delayedAssign(".GUI_RStudio", {
commandArgs()[[1L]] == "RStudio" &&
## fails if the process id cannot be converted to string:
# isTRUE(Sys.getpid() == Sys.getenv("RSTUDIO_SESSION_PID"))
## use this instead:
identical(Sys.getenv("RSTUDIO"), "1")
})
delayedAssign(".GUI_Positron", {
.scalar_streql(Sys.getenv("POSITRON"), "1") &&
Sys.getenv("POSITRON_VERSION") != "" &&
(
( .OS_unix && .Platform$GUI %in% c("X11", "unknown", "none") ) ||
( .OS_windows && .Platform$GUI == "Rgui" )
)
})
delayedAssign(".OS_unix_maybe_unembedded_shell" , { .OS_unix && .Platform$GUI %in% c("X11" , "unknown", "none") && "R" == basename2(commandArgs()[[1L]]) })
delayedAssign(".OS_windows_maybe_unembedded_shell", { .OS_windows && .Platform$GUI %in% c("RTerm", "unknown" ) && grepl("(?i)^Rterm(\\.exe)?$", basename2(commandArgs()[[1L]])) && .External2(.C_CharacterMode) == "RTerm" })
delayedAssign(".maybe_unembedded_shell", { .OS_unix_maybe_unembedded_shell || .OS_windows_maybe_unembedded_shell })
## see function do_shINFO in file ./src/shfile.c
delayedAssign(".shINFO", { .External2(.C_shINFO) })
delayedAssign(".OS_unix_console_radian" , { .OS_unix && .Platform$GUI %in% c("X11" , "unknown", "none") && commandArgs()[[1L]] == "radian" })
delayedAssign(".OS_windows_console_radian", { .OS_windows && .Platform$GUI %in% c("RTerm", "unknown" ) && commandArgs()[[1L]] == "radian" })
delayedAssign(".console_radian", { .OS_unix_console_radian || .OS_windows_console_radian })
delayedAssign(".GUI_vscode", {
interactive() &&
isTRUE(Sys.getenv("TERM_PROGRAM") == "vscode") &&
(
isFALSE(.shINFO[["has_input"]]) ||
.console_radian
)
})
## jupyter build a competent API challenge (impossible)
delayedAssign(".GUI_jupyter", {
!interactive() &&
Sys.getenv("JPY_API_TOKEN") != "" &&
Sys.getenv("JPY_PARENT_PID") != "" &&
.maybe_unembedded_shell &&
isTRUE(.shINFO[["has_input"]]) &&
is.na(.shINFO[["FILE"]]) &&
!is.na(.shINFO[["EXPR"]]) &&
length(commandArgs(TRUE)) == 1L &&
file.exists(commandArgs(TRUE)) &&
## this is the longest check, save for last
local({
exprs <- tryCatch(parse(text = .shINFO[["EXPR"]], n = -1, keep.source = FALSE, srcfile = NULL),
error = identity)
!inherits(exprs, "error") &&
length(exprs) &&
.identical(
exprs[[length(exprs)]],
as.call(list(call("::", quote(IRkernel), quote(main)))) # quote(IRkernel::main())
)
})
})
delayedAssign(".GUI_emacs", {
interactive() &&
Sys.getenv("STATATERM") == "emacs" &&
.maybe_unembedded_shell &&
(.OS_unix || (.OS_windows && .shINFO[["ess"]]))
})
delayedAssign(".GUI_powerbi", {
!interactive() &&
Sys.getenv("RPackagesLibrariesDirectory") != "" &&
Sys.getenv("RScriptWrapperWorkingDirectory") != "" &&
.maybe_unembedded_shell &&
.scalar_streql(.shINFO[["ENC"]], "UTF-8") &&
isTRUE(.shINFO[["has_input"]]) &&
!is.na(.shINFO[["FILE"]]) &&
is.na(.shINFO[["EXPR"]])
})
delayedAssign(".in_callr", {
!interactive() &&
.scalar_streql(Sys.getenv("CALLR_IS_RUNNING"), "true") &&
.maybe_unembedded_shell &&
isTRUE(.shINFO[["has_input"]]) &&
!is.na(.shINFO[["FILE"]]) &&
is.na(.shINFO[["EXPR"]]) &&
"tools:callr" %in% search()
})
delayedAssign(".GUI_AQUA", { .OS_unix && .Platform$GUI == "AQUA" && !.GUI_RStudio && !.GUI_Positron && !.GUI_vscode && !.GUI_jupyter && !.GUI_emacs && !.GUI_powerbi && !.in_callr })
delayedAssign(".GUI_Rgui", { .OS_windows && .Platform$GUI == "Rgui" && !.GUI_RStudio && !.GUI_Positron && !.GUI_vscode && !.GUI_jupyter && !.GUI_emacs && !.GUI_powerbi && !.in_callr && .External2(.C_RConsole) })
delayedAssign(".GUI_Tk" , { .OS_unix && .Platform$GUI == "Tk" && !.GUI_RStudio && !.GUI_Positron && !.GUI_vscode && !.GUI_jupyter && !.GUI_emacs && !.GUI_powerbi && !.in_callr })
delayedAssign(".OS_unix_in_shell" , { .OS_unix_maybe_unembedded_shell && !.GUI_Positron && !.GUI_vscode && !.GUI_jupyter && !.GUI_emacs && !.GUI_powerbi && !.in_callr })
delayedAssign(".OS_windows_in_shell", { .OS_windows_maybe_unembedded_shell && !.GUI_Positron && !.GUI_vscode && !.GUI_jupyter && !.GUI_emacs && !.GUI_powerbi && !.in_callr })
delayedAssign(".in_shell", { .OS_unix_in_shell || .OS_windows_in_shell })
delayedAssign(".unrecognized_manner", {
!.in_shell &&
!.GUI_RStudio &&
!.GUI_Positron &&
!.GUI_vscode &&
!.GUI_jupyter &&
!.GUI_emacs &&
!.GUI_powerbi &&
!.in_callr &&
!.GUI_Rgui &&
!.GUI_AQUA &&
!.GUI_Tk
})
delayedAssign(".ucrt", { identical(R.version[["crt"]], "ucrt") })
delayedAssign(".GUI", {
if (.in_shell) .Platform$GUI
else if (.GUI_RStudio) "RStudio"
else if (.GUI_Positron) "Positron"
else if (.GUI_vscode) "vscode"
else if (.GUI_jupyter) "jupyter"
else if (.GUI_emacs) "emacs"
else if (.GUI_powerbi) "powerbi"
# else if (.GUI_Rgui) "Rgui"
# else if (.GUI_AQUA) "AQUA"
# else if (.GUI_Tk) "Tk"
else .Platform$GUI
})
delayedAssign("initwd", { getwd() })
getinitwd <- function ()
initwd
.unset_these_envvars <- c(
"TERM_PROGRAM", "JPY_API_TOKEN", "JPY_PARENT_PID", "STATATERM",
"RPackagesLibrariesDirectory", "RScriptWrapperWorkingDirectory",
"CALLR_IS_RUNNING", "POSITRON", "POSITRON_VERSION"
)
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## these are expressions that are used in this package,
## but which are not expected to change value in a session,
## so we can evaluate them exactly once when needed
##
## if you've never heard of an R promise before, it's a mechanism for handling
## delayed argument evaluation and substitution. a promise consists of four
## things:
##
## * an expression
##
## * an environment in which the expression will be evaluated
##
## * value of evaluating said expression in said environment, initially empty
##
## * the number of attempts to evaluate the promise, used to detect recursive
## references and restarting interrupted promises
##
## it is called a promise because "I promise to evaluate this code in this
## environment if / / when requested"
##
## an object like an integer, a boolean, and a string will evaluate to itself.
## other objects like a symbol, a bytecode expression, or a call will evaluate
## the same as usual.
##
## if / / when the code has been evaluated, the value of the expression is
## stored inside the promise. this means the promise does not re-evaluate the
## same piece of code multiple times. for example:
##
## ```R
## delayedAssign("x", {
## writeLines("evaluating 'x'")
## 5 + 6
## })
## x
## x
## x
## ```
##
## which produces the following output:
##
## ```
## > delayedAssign("x", {
## + writeLines("evaluating 'x'")
## + 5 + 6
## + })
## > x
## evaluating 'x'
## [1] 11
## > x
## [1] 11
## > x
## [1] 11
## >
## ```
##
## you'll see that the expression `writeLines("evaluating 'x'")` is only
## evaluated once, as desired! you can use `ikws.debug::PRINFO()` to examine
## the state of the promise:
##
## ```R
## delayedAssign("x", {
## writeLines("evaluating 'x'")
## 5 + 6
## })
## ikws.debug::PRINFO(x)
## x
## ikws.debug::PRINFO(x)
## ```
##
## which produces the following output:
##
## ```
## > delayedAssign("x", {
## + writeLines("evaluating 'x'")
## + 5 + 6
## + })
## > ikws.debug::PRINFO(x)
## $PRCODE
## {
## writeLines("evaluating 'x'")
## 5 + 6
## }
##
## $PRENV
## <environment: R_GlobalEnv>
##
## $PREXPR
## {
## writeLines("evaluating 'x'")
## 5 + 6
## }
##
## $PRSEEN
## [1] 0
##
## > x
## evaluating 'x'
## [1] 11
## > ikws.debug::PRINFO(x)
## $PRCODE
## {
## writeLines("evaluating 'x'")
## 5 + 6
## }
##
## $PRENV
## NULL
##
## $PREXPR
## {
## writeLines("evaluating 'x'")
## 5 + 6
## }
##
## $PRSEEN
## [1] 0
##
## $PRVALUE
## [1] 11
##
## >
## ```
##
## "PRCODE", "PRENV", "PRVALUE", and "PRSEEN" were all mentioned earlier, but
## "PREXPR" has not been mentioned yet. if "PRCODE" is a bytecode, then
## "PREXPR" will be the uncompiled version of "PRCODE". in all other cases,
## they are identical.
##
## notice that "PRENV" is set to `NULL` once the promise has been evaluated,
## it's not very important right now to understand why, this has to do with
## garbage collection. this allows the garbage collector to collect
## environments which are no longer in use.
##
## "PRSEEN" was mentioned earlier, it is an integer used to determine if a
## promise leads to infinite recursion or has been interrupted and is being
## restarted. for example:
##
## ```R
## delayedAssign("x", withAutoprint({
## 5 + 6
## ikws.debug::PRINFO(x)
## x
## }))
## ikws.debug::PRINFO(x)
## try(x)
## ikws.debug::PRINFO(x)
## ```
##
## notice "PRSEEN" is 0 when `x` is not being evaluated, it is 1 when `x` is
## being evaluated, and it is 2 when `x` has been interrupted (by an error) and
## restarted:
##
## ```
## > ikws.debug::PRINFO(x)
## $PRCODE
## withAutoprint({
## 5 + 6
## ikws.debug::PRINFO(x)
## x
## })
##
## $PRENV
## <environment: R_GlobalEnv>
##
## $PREXPR
## withAutoprint({
## 5 + 6
## ikws.debug::PRINFO(x)
## x
## })
##
## $PRSEEN
## [1] 0
##
## > try(x)
## > 5 + 6
## [1] 11
## > ikws.debug::PRINFO(x)
## $PRCODE
## withAutoprint({
## 5 + 6
## ikws.debug::PRINFO(x)
## x
## })
##
## $PRENV
## <environment: R_GlobalEnv>
##
## $PREXPR
## withAutoprint({
## 5 + 6
## ikws.debug::PRINFO(x)
## x
## })
##
## $PRSEEN
## [1] 1
##
## > x
## Error in eval(ei, envir) :
## promise already under evaluation: recursive default argument reference or earlier problems?
## > ikws.debug::PRINFO(x)
## $PRCODE
## withAutoprint({
## 5 + 6
## ikws.debug::PRINFO(x)
## x
## })
##
## $PRENV
## <environment: R_GlobalEnv>
##
## $PREXPR
## withAutoprint({
## 5 + 6
## ikws.debug::PRINFO(x)
## x
## })
##
## $PRSEEN
## [1] 2
##
## >
## ```
##
## these promises are created when the package is built and installed. they are
## evaluated during the regular use of the package
delayedAssign(".OS_unix" , { .Platform$OS.type == "unix" })
delayedAssign(".OS_windows", { .Platform$OS.type == "windows" })
## we need to determine the type of GUI in use. unfortunately, .Platform$GUI is
## not good enough. for example, 'VSCode' and 'Jupyter' do not set
## .Platform$GUI, and 'RStudio' does not set .Platform$GUI until after the
## site-wide startup profile file, a user profile, and the function .First()
## have been run (see ?Startup).
##
## as such, I've made my own ways of determining the type of GUI in use
delayedAssign(".GUI_RStudio", {
commandArgs()[[1L]] == "RStudio" &&
## fails if the process id cannot be converted to string:
# isTRUE(Sys.getpid() == Sys.getenv("RSTUDIO_SESSION_PID"))
## use this instead:
identical(Sys.getenv("RSTUDIO"), "1")
})
delayedAssign(".GUI_Positron", {
.scalar_streql(Sys.getenv("POSITRON"), "1") &&
Sys.getenv("POSITRON_VERSION") != "" &&
(
( .OS_unix && .Platform$GUI %in% c("X11", "unknown", "none") ) ||
( .OS_windows && .Platform$GUI == "Rgui" )
)
})
delayedAssign(".OS_unix_maybe_unembedded_shell" , { .OS_unix && .Platform$GUI %in% c("X11" , "unknown", "none") && "R" == basename2(commandArgs()[[1L]]) })
delayedAssign(".OS_windows_maybe_unembedded_shell", { .OS_windows && .Platform$GUI %in% c("RTerm", "unknown" ) && grepl("(?i)^Rterm(\\.exe)?$", basename2(commandArgs()[[1L]])) && .External2(.C_CharacterMode) == "RTerm" })
delayedAssign(".maybe_unembedded_shell", { .OS_unix_maybe_unembedded_shell || .OS_windows_maybe_unembedded_shell })
## see function do_shINFO in file ./src/shfile.c
delayedAssign(".shINFO", { .External2(.C_shINFO) })
delayedAssign(".OS_unix_console_radian" , { .OS_unix && .Platform$GUI %in% c("X11" , "unknown", "none") && commandArgs()[[1L]] == "radian" })
delayedAssign(".OS_windows_console_radian", { .OS_windows && .Platform$GUI %in% c("RTerm", "unknown" ) && commandArgs()[[1L]] == "radian" })
delayedAssign(".console_radian", { .OS_unix_console_radian || .OS_windows_console_radian })
delayedAssign(".GUI_vscode", {
interactive() &&
isTRUE(Sys.getenv("TERM_PROGRAM") == "vscode") &&
(
isFALSE(.shINFO[["has_input"]]) ||
.console_radian
)
})
## jupyter build a competent API challenge (impossible)
delayedAssign(".GUI_jupyter", {
!interactive() &&
Sys.getenv("JPY_API_TOKEN") != "" &&
Sys.getenv("JPY_PARENT_PID") != "" &&
.maybe_unembedded_shell &&
isTRUE(.shINFO[["has_input"]]) &&
is.na(.shINFO[["FILE"]]) &&
!is.na(.shINFO[["EXPR"]]) &&
length(commandArgs(TRUE)) == 1L &&
file.exists(commandArgs(TRUE)) &&
## this is the longest check, save for last
local({
exprs <- tryCatch(parse(text = .shINFO[["EXPR"]], n = -1, keep.source = FALSE, srcfile = NULL),
error = identity)
!inherits(exprs, "error") &&
length(exprs) &&
.identical(
exprs[[length(exprs)]],
as.call(list(call("::", quote(IRkernel), quote(main)))) # quote(IRkernel::main())
)
})
})
delayedAssign(".GUI_emacs", {
interactive() &&
Sys.getenv("STATATERM") == "emacs" &&
.maybe_unembedded_shell &&
(.OS_unix || (.OS_windows && .shINFO[["ess"]]))
})
delayedAssign(".GUI_powerbi", {
!interactive() &&
Sys.getenv("RPackagesLibrariesDirectory") != "" &&
Sys.getenv("RScriptWrapperWorkingDirectory") != "" &&
.maybe_unembedded_shell &&
.scalar_streql(.shINFO[["ENC"]], "UTF-8") &&
isTRUE(.shINFO[["has_input"]]) &&
!is.na(.shINFO[["FILE"]]) &&
is.na(.shINFO[["EXPR"]])
})
delayedAssign(".in_callr", {
!interactive() &&
.scalar_streql(Sys.getenv("CALLR_IS_RUNNING"), "true") &&
.maybe_unembedded_shell &&
isTRUE(.shINFO[["has_input"]]) &&
!is.na(.shINFO[["FILE"]]) &&
is.na(.shINFO[["EXPR"]]) &&
"tools:callr" %in% search()
})
delayedAssign(".GUI_AQUA", { .OS_unix && .Platform$GUI == "AQUA" && !.GUI_RStudio && !.GUI_Positron && !.GUI_vscode && !.GUI_jupyter && !.GUI_emacs && !.GUI_powerbi && !.in_callr })
delayedAssign(".GUI_Rgui", { .OS_windows && .Platform$GUI == "Rgui" && !.GUI_RStudio && !.GUI_Positron && !.GUI_vscode && !.GUI_jupyter && !.GUI_emacs && !.GUI_powerbi && !.in_callr && .External2(.C_RConsole) })
delayedAssign(".GUI_Tk" , { .OS_unix && .Platform$GUI == "Tk" && !.GUI_RStudio && !.GUI_Positron && !.GUI_vscode && !.GUI_jupyter && !.GUI_emacs && !.GUI_powerbi && !.in_callr })
delayedAssign(".OS_unix_in_shell" , { .OS_unix_maybe_unembedded_shell && !.GUI_Positron && !.GUI_vscode && !.GUI_jupyter && !.GUI_emacs && !.GUI_powerbi && !.in_callr })
delayedAssign(".OS_windows_in_shell", { .OS_windows_maybe_unembedded_shell && !.GUI_Positron && !.GUI_vscode && !.GUI_jupyter && !.GUI_emacs && !.GUI_powerbi && !.in_callr })
delayedAssign(".in_shell", { .OS_unix_in_shell || .OS_windows_in_shell })
delayedAssign(".unrecognized_manner", {
!.in_shell &&
!.GUI_RStudio &&
!.GUI_Positron &&
!.GUI_vscode &&
!.GUI_jupyter &&
!.GUI_emacs &&
!.GUI_powerbi &&
!.in_callr &&
!.GUI_Rgui &&
!.GUI_AQUA &&
!.GUI_Tk
})
delayedAssign(".ucrt", { identical(R.version[["crt"]], "ucrt") })
delayedAssign(".GUI", {
if (.in_shell) .Platform$GUI
else if (.GUI_RStudio) "RStudio"
else if (.GUI_Positron) "Positron"
else if (.GUI_vscode) "vscode"
else if (.GUI_jupyter) "jupyter"
else if (.GUI_emacs) "emacs"
else if (.GUI_powerbi) "powerbi"
# else if (.GUI_Rgui) "Rgui"
# else if (.GUI_AQUA) "AQUA"
# else if (.GUI_Tk) "Tk"
else .Platform$GUI
})
delayedAssign("initwd", { getwd() })
getinitwd <- function ()
initwd
.unset_these_envvars <- c(
"TERM_PROGRAM", "JPY_API_TOKEN", "JPY_PARENT_PID", "STATATERM",
"RPackagesLibrariesDirectory", "RScriptWrapperWorkingDirectory",
"CALLR_IS_RUNNING", "POSITRON", "POSITRON_VERSION"
)
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