Re: [Bug-apl] problems with ^D

[Juergen Sauermann]

Hi Jay, this behavior is kind of intended, but I would be open for better solutions. The underlying problem is this: GNU APL can run interactively or from a script. But I have not found a reliable way to distinguish the two cases and I didn't want to introduce a command line option for it either because I consider that as too inconvenient for the user. First of all, I thought that displaying the message 5 times would be enough for a human (= interactive user) and continuing to display the message more often is simply bad (because if that happens in a GNU APL script then it would blow up everything. The rest then depends on the timing. If several ^Ds come in quickly then I assume a script is running (actually finished) and has closed stdin. In that case I exit the interpreter because a script that has not performed )OFF or ]NEXTFILE at this point has no chance to continue and would hang if I would not exit the interpreter. Otherwise (the ^Ds come in more slowly) I expect a human user (who was warned earlier that he should use )OFF) The message "EOF at Command.cc:65" is an indication that ^D was detected. Everything entered before that message is being discarded (including a possibly entered command like )OFF.). /// Jürgen On 08/21/2015 12:46 PM, Jay Foad wrote: When I build and run GNU APL on Ubuntu 15.04, ^D seems to behave strangely. 1. The first four times I hit it I get "^D" echoed, followed by a blank line and a helpful message. After that I just get "^D" echoed, with no message at all. (I expected it to exit the interpreter if I hit it n times in a row, for some value of n; this is what the bash shell does when you set e.g. IGNOREEOF=10.) ^D ^D or end-of-input detected (1). Use )OFF to leave APL! ^D ^D or end-of-input detected (2). Use )OFF to leave APL! ^D ^D or end-of-input detected (3). Use )OFF to leave APL! ^D ^D or end-of-input detected (4). Use )OFF to leave APL! ^D ^D ^D 2. The next line I type after hitting ^D always seems to cause a strange error in Command.cc: ^D ^D or end-of-input detected (1). Use )OFF to leave APL! )off EOF at Command.cc:65 )off Goodbye. I had to type )off twice here, because the first one just gave the EOF error and didn't exit the interpreter. Thanks, Jay.