#borrowed main bits from https://github.com/jimhester/completeme (when it is put on CRAN will import directly from it)
the <- new.env(parent = emptyenv())
the$completions <- list()
complete_token <- get(".completeToken", asNamespace("utils"))
# Register completion functions
#
# Completion functions should take one parameter `env`, the completion
# environment, see `?rc.settings` for details of this environment. They should
# simply return any completions found or `return(NULL)` otherwise.
#
# If all registered completions do not have any completions for a given
# context, than R's standard completions are used.
# @param ... One or more completion functions specified as named parameters.
#' @importFrom utils modifyList
register_completion <- function(...) {
funs <- list(...)
nms <- names(funs)
if (is.null(nms) || any(nms == "" | is.na(nms))) {
wch <- if (is.null(nms)) 1 else which(nms == "" | is.na(nms))
stop("All arguments must be named")
}
old <- the$completions
the$completions <- utils::modifyList(the$completions, funs)
invisible(old)
}
#' @importFrom utils rc.options
completeme <- function(env) {
env$fileName <- FALSE
for (fun in the$completions) {
env$comps <- fun(env)
if (length(env$comps) > 0) {
attributes(env$comps) <- list(class = "completions", type = 15)
# this_type <- attr(env$comps, "type") %||% 15
return(invisible(env$comps))
}
}
env$comps <- character()
# if in the IDE, throw an error to fallback on normal completion
if (identical(.Platform$GUI, "RStudio")) {
stop("No custom completions")
}
# If on the command line, fall back to using the default completer
on.exit(rc.options(custom.completer = completeme))
rc.options(custom.completer = NULL)
complete_token()
invisible(env$comps)
}
#' @importFrom rematch2 re_match
current_function <- function(env) {
buffer <- env[["linebuffer"]]
fun <- rematch2::re_match(buffer, "(?<fun>[^[:space:](]+)[(][^(]*$")$fun
if (is.na(fun)) {
return("")
}
fun
}
populate <- function(env){
fun <- current_function(env)
this_ns <- find_the()
comp <- NULL
if('shredder'%in%this_ns){
fun1 <- strsplit(fun,'%>%')[[1]]
fun_tail <- fun1[length(fun1)]
fun_head <- fun1[1]
comp <- names(formals(fun_tail))
no_dots <- !grepl('...',comp,fixed = TRUE)
comp[no_dots] <- sprintf('%s = ',comp[no_dots])
if(grepl('stan_(select|filter)$',fun_tail)){
object <- NULL
if(fun_head%in%ls(envir = globalenv()))
object <- get(fun_head,envir = globalenv())
if(inherits(object,'stanfit')){
comp <- union(object@sim$pars_oi,object@sim$fnames_oi)
assign('pars',comp,envir = pars_env)
}
if(inherits(object,'brmsfit')){
comp <- union(object$fit@sim$pars_oi,object$fit@sim$fnames_oi)
assign('pars',comp,envir = pars_env)
}
}
}
return(comp)
}
find_the <- function(){
names(which(sapply(loadedNamespaces(),function(x) any(grepl('^the$',ls(envir = asNamespace(x)))))))
}
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