|Subject:||Re: [Nmh-workers] Ditch autoconf selection of pager?|
|Date:||Mon, 14 Jan 2013 15:01:47 -0800|
|User-agent:||Postbox 3.0.6 (Windows/20121031)|
Ken Hornstein wrote:
not all terminals were capable of doing the cursor addressing needed for any given screen-oriented editor. so the user was given the ability to configure two editors -- likely "ed" and "vi", though some folks may have used emacs or "se" :-). some programs had separate commands for invoking the two. (for instance, see ~e and ~v in the mailx man page.)Ok, so I get in the mailx case there was ~e and ~v. But how did other programs know when to use VISUAL and when to use EDITOR? I guess that's the real confusing part to me; it was never clear to me how that decision was made (all of the examples I ever found checked VISUAL then fell back to EDITOR).
none of us knew. here's what "crontab" does for its -e mode.
# define EDITOR _PATH_VI
# define EDITOR "/usr/ucb/vi"
if ((!(editor = getenv("VISUAL")))
&& (!(editor = getenv("EDITOR")))
editor = EDITOR;
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