I propose to add to traceback three new arguments:
- file : filename for output
- strip: strip each line of backtraced code to ``width'' characters
- width: the length of the stripped output text (default 76)
Below you find a proposal for the code changes.
Wolfram
traceback <- function(
#--- NEW ---
file = "", strip = FALSE, width = 76
#---
){
if (exists(".Traceback", env = .GlobalEnv))
.Traceback <- get(".Traceback", env = .GlobalEnv)
else .Traceback <- NULL
if (is.null(.Traceback) || length(.Traceback) == 0)
cat("No traceback available\n")
else{
vib.append <- F
n <- length(.Traceback)
for (i in 1:n) {
label <- paste(n - i + 1, ": ", sep = "")
#--- NEW ---
if( strip ){
cat( file=file, paste(label, substr( .Traceback[[i]][1]
, 1, width), sep = "" )
, sep = "\n", append=vib.append )
}else{
#---
if ((m <- length(.Traceback[[i]])) > 1)
label <- c(label, rep(substr(" ", 1,
nchar(label)), m - 1))
cat(
#--- NEW ---
file=file,
#---
paste(label, .Traceback[[i]], sep =
""),
sep = "\n",append=vib.append)
#--- NEW ---
}
#---
vib.append <- T
}
}
invisible()
}
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