Re: pgsql: Add basic TAP tests for psql's tab-completion logic.

Re: Tom Lane 2020-01-05 <25771(dot)1578249042(at)sss(dot)pgh(dot)pa(dot)us>
> The current state of play on this is that I committed a hacky workaround
> [1], but there is now a fix for it in libedit upstream [2][3]. I gather
> from looking at Debian's package page that the fix could be expected to
> propagate to Debian unstable within a few weeks, at which point I'd like
> to revert the hack. The libedit bug's only been there a few months
> (it was evidently introduced on 2019-03-31) so we can hope that it hasn't
> propagated into any long-term-support distros.
[...]

I lost track of what bug is supposed to be where, so here's a summary
of the state at apt.postgresql.org:

PG13 head work on Debian unstable, buster, stretch.
Does not work on Ubuntu bionic, xenial. (Others not tested.)

Ubuntu xenial:

07:24:42 # Failed test 'complete SEL<tab> to SELECT'
07:24:42 # at t/010_tab_completion.pl line 98.
07:24:42 # Actual output was "SEL\tpostgres=# SEL\a"
07:24:42 # Did not match "(?^:SELECT )"
07:24:48
07:24:48 # Failed test 'complete sel<tab> to select'
07:24:48 # at t/010_tab_completion.pl line 103.
07:24:48 # Actual output was "sel\b\b\bSELECT "
07:24:48 # Did not match "(?^:select )"
07:24:54
07:24:54 # Failed test 'complete t<tab> to tab1'
07:24:54 # at t/010_tab_completion.pl line 106.
07:24:54 # Actual output was "* from t "
07:24:54 # Did not match "(?^:\* from tab1 )"
07:25:00
07:25:00 # Failed test 'complete my<tab> to mytab when there are multiple choices'
07:25:00 # at t/010_tab_completion.pl line 112.
07:25:00 # Actual output was "select * from my "
07:25:00 # Did not match "(?^:select \* from my\a?tab)"
07:25:06
07:25:06 # Failed test 'offer multiple table choices'
07:25:06 # at t/010_tab_completion.pl line 118.
07:25:06 # Actual output was "\r\n\r\n\r\r\npostgres=# select * from my \r\n\r\n\r\r\npostgres=# select * from my "
07:25:06 # Did not match "(?^:mytab123 +mytab246)"
07:25:12
07:25:12 # Failed test 'finish completion of one of multiple table choices'
07:25:12 # at t/010_tab_completion.pl line 123.
07:25:12 # Actual output was "2 "
07:25:12 # Did not match "(?^:246 )"
07:25:18
07:25:18 # Failed test 'complete \DRD<tab> to \drds'
07:25:18 # at t/010_tab_completion.pl line 131.
07:25:18 # Actual output was "\\DRD\b\b\b\bselect "
07:25:18 # Did not match "(?^:drds )"
07:25:18 # Looks like you failed 7 tests of 12.
07:25:18 t/010_tab_completion.pl ..
07:25:18 Dubious, test returned 7 (wstat 1792, 0x700)
07:25:18 Failed 7/12 subtests

Ubuntu bionic fails elsewhere:

07:19:51 t/001_stream_rep.pl .................. ok
07:19:53 t/002_archiving.pl ................... ok
07:19:59 t/003_recovery_targets.pl ............ ok
07:20:01 t/004_timeline_switch.pl ............. ok
07:20:08 t/005_replay_delay.pl ................ ok
07:20:10 Bailout called. Further testing stopped: system pg_ctl failed
07:20:10 FAILED--Further testing stopped: system pg_ctl failed

07:20:10 2020-01-06 06:19:41.285 UTC [26415] LOG: received fast shutdown request
07:20:10 2020-01-06 06:19:41.285 UTC [26415] LOG: aborting any active transactions
07:20:10 2020-01-06 06:19:41.287 UTC [26415] LOG: background worker "logical replication launcher" (PID 26424) exited with exit code 1
07:20:10 2020-01-06 06:19:41.287 UTC [26419] LOG: shutting down
07:20:10 2020-01-06 06:19:41.287 UTC [26419] LOG: checkpoint starting: shutdown immediate

(It didn't get to the 010_tab_completion.pl test.)

Libedit versions are:

Debian:
libedit2 | 3.1-20140620-2 | oldoldstable | amd64, armel, armhf, i386 (jessie)
libedit2 | 3.1-20160903-3 | oldstable | amd64, arm64, armel, armhf, i386, mips, mips64el, m (stretch)
libedit2 | 3.1-20181209-1 | stable | amd64, arm64, armel, armhf, i386, mips, mips64el, m (buster)
libedit2 | 3.1-20191211-1 | testing | amd64, arm64, armel, armhf, i386, mips64el, mipsel, (bullseye)
libedit2 | 3.1-20191231-1 | unstable | amd64, arm64, armel, armhf, i386, mips64el, mipsel,

Ubuntu:
libedit2 | 2.11-20080614-3ubuntu2 | precise | amd64, armel, armhf, i386, powerpc
libedit2 | 3.1-20130712-2 | trusty | amd64, arm64, armhf, i386, powerpc, ppc64e
libedit2 | 3.1-20150325-1ubuntu2 | xenial | amd64, arm64, armhf, i386, powerpc, ppc64e
libedit2 | 3.1-20170329-1 | bionic | amd64, arm64, armhf, i386, ppc64el, s390x
libedit2 | 3.1-20181209-1 | disco | amd64, arm64, armhf, i386, ppc64el, s390x
libedit2 | 3.1-20190324-1 | eoan | amd64, arm64, armhf, i386, ppc64el, s390x
libedit2 | 3.1-20191211-1 | focal | amd64, arm64, armhf, i386, ppc64el, s390x
libedit2 | 3.1-20191231-1 | focal-proposed | amd64, arm64, armhf, i386, ppc64el, s390x

Christoph