# control characaters
Code
for (code in c(1:2, 4:6, 8:14, 16L, 20L, 21L, 23L, 27L, 127L)) {
p$write_input("cli::keypress()\n")
Sys.sleep(0.1)
p$write_input(as.raw(code))
p$poll_io(1000)
cat(p$read_output())
}
Output
[1] "ctrl-a"
[1] "ctrl-b"
[1] "ctrl-d"
[1] "ctrl-e"
[1] "ctrl-f"
[1] "ctrl-h"
[1] "tab"
[1] "enter"
[1] "ctrl-k"
[1] "ctrl-l"
[1] "enter"
[1] "ctrl-n"
[1] "ctrl-p"
[1] "ctrl-t"
[1] "ctrl-u"
[1] "ctrl-w"
[1] "escape"
[1] "backspace"
# write ahead
Code
p$write_input("{ Sys.sleep(0.5); cli::keypress() }\nX")
p$poll_io(1000)
Output
output error process
"ready" "nopipe" "silent"
Code
cat(p$read_output())
Output
[1] "X"
# arrows, etc
Code
for (key in keys) {
p$write_input("cli::keypress()\n")
p$write_input(key)
p$poll_io(1000)
cat(p$read_output())
}
Output
[1] "up"
[1] "right"
[1] "left"
[1] "end"
[1] "home"
[1] "-"
[1] "up"
[1] "down"
[1] "right"
[1] "left"
[1] "end"
[1] "home"
[1] "-"
[1] "home"
[1] "insert"
[1] "delete"
[1] "end"
[1] "pageup"
[1] "pagedown"
[1] "-"
[1] "pageup"
[1] "pagedown"
[1] "-"
[1] "home"
[1] "end"
[1] "-"
[1] "f1"
[1] "f2"
[1] "f3"
[1] "f4"
[1] "-"
[1] "f5"
[1] "f6"
[1] "f7"
[1] "f8"
[1] "f9"
[1] "f10"
[1] "f11"
[1] "f12"
[1] "-"
[1] "f1"
[1] "f2"
[1] "f3"
[1] "f4"
[1] "-"
[1] "escape"
# nonblocking
Code
p$write_input("cli::keypress(block = FALSE)\n")
p$poll_io(1000)
Output
output error process
"ready" "nopipe" "silent"
Code
cat(p$read_output())
Output
[1] NA
---
Code
p$write_input("{ Sys.sleep(0.5); cli::keypress() }\nX")
p$poll_io(1000)
Output
output error process
"ready" "nopipe" "silent"
Code
cat(p$read_output())
Output
[1] "X"
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