Commit bd1276a

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Prepare tab-complete.c for preprocessing.

Separate out psql_completion's giant else-if chain of *Matches tests into a new function. Add the infrastructure needed for table-driven checking of the initial match of each completion rule. As-is, however, the code continues to operate as it did. The new behavior applies only if SWITCH_CONVERSION_APPLIED is #defined, which it is not here. (The preprocessor added in the next patch will add a #define for that.) The first and last couple of bits of psql_completion are not based on HeadMatches/TailMatches/Matches tests, so they stay where they are; they won't become part of the switch. This patch also fixes up a couple of if-conditions that didn't meet the conditions enumerated in the comment for match_previous_words(). Those restrictions exist to simplify the preprocessor. Discussion: https://postgr.es/m/2208466.1720729502@sss.pgh.pa.us

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src
- bin/psql
  - tab-complete.c
- tools/pgindent
  - typedefs.list

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