tput ed is empty
Apple configured ncurses with termcap support (in addition to the default terminfo):
- config.status file showing the configure options.
- infocmp calls _nc_read_file_entry to obtain its data.
- tput calls setupterm, which goes to
_nc_read_entry, which calls
_nc_read_tic_entry, which does call
- if there's a problem in
_nc_read_entryfalls back to the termcap support (see
Since that's ten-year-old code, the possible problem in _nc_read_tic_entry may have been fixed a while back.
For instance, I have MacPorts installed, and that works properly, while Apple's version does not. Here is a top-level script that I used to investigate the problem with:
#!/bin/sh unset TERMINFO unset TERMINFO_DIRS export TERM=xterm-256color #export PATH=/usr/bin:$PATH echo TERMCAP infocmp -CrTt1 | grep -E ':..=.*:' | sed -e 's/^ ://' -e 's/=.*//' | xargs -n 1 /tmp/test-tput echo TERMINFO infocmp -1 | grep -E '^ .*=.*,' | sed -e 's/^ //' -e 's/=.*//' | xargs -n 1 /tmp/test-tput
PATH to select between the two), and that called a second script
/tmp/test-tput to show the values:
#!/bin/bash tput "$1" >/dev/null 2>/dev/null || exit echo -n "CAP:$1 " tput "$1" 2>/dev/null echo
The behavior in ncurses 5.7 was a bug introduced in 1999
+ modify tput to accept termcap names as an alternative to terminfo names (patch by Jeffrey C Honig).
and fixed in 2009:
+ change order of lookup in progs/tput.c, looking for terminfo data first. This fixes a confusion between termcap "sg" and terminfo "sgr" or "sgr0", originally from 990123 changes, but exposed by 20091114 fixes for hashing. With this change, only "dl" and "ed" are ambiguous (Mandriva #56272).
Apple's ncurses 5.7 is about a year older than that fix.
Are more googling and scouring the documentation (mainly terminfo), I finally figured out that I need to fall back to the older termcap code since the capname is not supported for all terminfo capabilities.
ed=$(tput ed || tput cd)