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Tom Lane e984ef5861 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		9 years ago
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initdb	ICU support	9 years ago
pg_archivecleanup	pg_archivecleanup: Add NLS	9 years ago
pg_basebackup	Clean up Perl code according to perlcritic	9 years ago
pg_config	Update copyright via script for 2017	9 years ago
pg_controldata	Support SCRAM-SHA-256 authentication (RFC 5802 and 7677).	9 years ago
pg_ctl	Clean up Perl code according to perlcritic	9 years ago
pg_dump	pg_dump: Remove query truncation in error messages	9 years ago
pg_resetwal	Suppress implicit-conversion warnings seen with newer clang versions.	9 years ago
pg_rewind	Fix inclusions of c.h from .h files.	9 years ago
pg_test_fsync	pg_test_fsync: Add NLS	9 years ago
pg_test_timing	pg_test_timing: Add NLS	9 years ago
pg_upgrade	Rename "pg_clog" directory to "pg_xact".	9 years ago
pg_waldump	pg_waldump: Remove extra newline in error message	9 years ago
pgbench	Fix pgbench's failure to honor the documented long-form option "--builtin".	9 years ago
pgevent	Remove useless duplicate inclusions of system header files.	9 years ago
psql	Support \if ... \elif ... \else ... \endif in psql scripting.	9 years ago
scripts	Remove createlang and droplang	9 years ago
Makefile	Rename user-facing tools with "xlog" in the name to say "wal".	9 years ago