]> granicus.if.org Git - postgresql/commit
Support \if ... \elif ... \else ... \endif in psql scripting.
authorTom Lane <tgl@sss.pgh.pa.us>
Thu, 30 Mar 2017 16:59:11 +0000 (12:59 -0400)
committerTom Lane <tgl@sss.pgh.pa.us>
Thu, 30 Mar 2017 16:59:24 +0000 (12:59 -0400)
commite984ef5861df4bc9733b36271d05763e82de7c04
tree6e4d3da7bffef5e8f4255f073d89b18a1d6ce893
parentffae6733db1f9d4a3a75d737a00ee2a4a3e01849
Support \if ... \elif ... \else ... \endif in psql scripting.

This patch adds nestable conditional blocks to psql.  The control
structure feature per se is complete, but the boolean expressions
understood by \if and \elif are pretty primitive; basically, after
variable substitution and backtick expansion, the result has to be
"true" or "false" or one of the other standard spellings of a boolean
value.  But that's enough for many purposes, since you can always
do the heavy lifting on the server side; and we can extend it later.

Along the way, pay down some of the technical debt that had built up
around psql/command.c:
* Refactor exec_command() into a function per command, instead of
being a 1500-line monstrosity.  This makes the file noticeably longer
because of repetitive function header/trailer overhead, but it seems
much more readable.
* Teach psql_get_variable() and psqlscanslash.l to suppress variable
substitution and backtick expansion on the basis of the conditional
stack state, thereby allowing removal of the OT_NO_EVAL kluge.
* Fix the no-doubt-once-expedient hack of sometimes silently substituting
mainloop.c's previous_buf for query_buf when calling HandleSlashCmds.
(It's a bit remarkable that commands like \r worked at all with that.)
Recall of a previous query is now done explicitly in the slash commands
where that should happen.

Corey Huinker, reviewed by Fabien Coelho, further hacking by me

Discussion: https://postgr.es/m/CADkLM=c94OSRTnat=LX0ivNq4pxDNeoomFfYvBKM5N_xfmLtAA@mail.gmail.com
17 files changed:
doc/src/sgml/ref/psql-ref.sgml
src/bin/psql/Makefile
src/bin/psql/command.c
src/bin/psql/command.h
src/bin/psql/common.c
src/bin/psql/conditional.c [new file with mode: 0644]
src/bin/psql/conditional.h [new file with mode: 0644]
src/bin/psql/copy.c
src/bin/psql/help.c
src/bin/psql/mainloop.c
src/bin/psql/prompt.c
src/bin/psql/prompt.h
src/bin/psql/psqlscanslash.h
src/bin/psql/psqlscanslash.l
src/bin/psql/startup.c
src/test/regress/expected/psql.out
src/test/regress/sql/psql.sql