R devel - Sep 2006 - modifs on ls

Hi all,

It would be great to be able to use a syntax like :

R> ls("grid:::grid\.")

instead of :

R> ls("package:grid", pattern = "^grid\.")

Here is a modified version of `ls` that does the job. [ The only modifs 
are just after the if(!missing(name))  ]
Does that make sense ?

Cheers,

Romain


ls <- objects <-
    function (name, pos = -1, envir = as.environment(pos), all.names = 
FALSE,
              pattern)
{


    if (!missing(name)) {
       
        if(length(grep(":::", name))){
           spl <- strsplit(name, ":::")[[1]] 
           name <- paste("package:", spl[1] , sep="")
           pattern  <- paste("^", spl[2], sep="")
        }
       
       
        nameValue <- try(name)
        if(identical(class(nameValue), "try-error")) {
            name <- substitute(name)
            if (!is.character(name))
                name <- deparse(name)
            pos <- name
        }
        else
            pos <- nameValue
    }
    all.names <- .Internal(ls(envir, all.names))
   
  
   
    if (!missing(pattern)) {
       
        if ((ll <- length(grep("[", pattern, fixed=TRUE))) > 0
&&
            ll != length(grep("]", pattern, fixed=TRUE))) {
            if (pattern == "[") {
                pattern <- "\\["
                warning("replaced regular expression pattern '[' by
'\\\\['")
            }
            else if (length(grep("[^\\\\]\\[<-", pattern) > 0))
{
                pattern <- sub("\\[<-",
"\\\\\\[<-", pattern)
                warning("replaced '[<-' by '\\\\[<-'
in regular
expression pattern")
            }
        }
        grep(pattern, all.names, value = TRUE)
    }
    else all.names
}


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