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Use negative or infinite sheet number to select sheet counting from the last #742

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Use negative or infinite sheet number to select sheet counting from the last #742

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90f77c3
handle negative sheet number
DanChaltiel Mar 11, 2024
d081c12
handle infinite sheet number
DanChaltiel Mar 11, 2024
6e45b84
Update NEWS.md
DanChaltiel Mar 11, 2024
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4 changes: 4 additions & 0 deletions NEWS.md
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Original file line number Diff line number Diff line change
@@ -1,5 +1,9 @@
# readxl (development version)

# readxl 1.5.0

* Sheet number in `read_excel()`, `read_xls()`, and `read_xlsx()` can now be negative or infinite to select the sheet counting from the last one (#742, @DanChaltiel).

# readxl 1.4.3

This release contains no user-facing changes.
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7 changes: 5 additions & 2 deletions R/read_excel.R
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Expand Up @@ -237,9 +237,12 @@ standardise_sheet <- function(sheet, range, sheet_names) {

if (is.numeric(sheet)) {
if (sheet < 1) {
stop("`sheet` must be positive", call. = FALSE)
if(is.infinite(sheet)) sheet <- -length(sheet_names)
length(sheet_names) + sheet
} else {
if(is.infinite(sheet)) sheet <- length(sheet_names)
floor(sheet) - 1L
}
floor(sheet) - 1L
} else if (is.character(sheet)) {
if (!(sheet %in% sheet_names)) {
stop("Sheet '", sheet, "' not found", call. = FALSE)
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