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# 5. Goals Buffer Settings

The goals buffer settings allow configuration of Proof General for proof by pointing or similar features. See the Proof General documentation web page for a link to the technical report ECS-LFCS-97-368 which hints at how to use these settings.

Variable: pg-goals-change-goal

  Command to change to the goal ‘`%s`’.

Variable: pbp-goal-command

  Command sent when ‘``pg-goals-button-action``’ is requested on a goal.

Variable: pbp-hyp-command

  Command sent when ‘``pg-goals-button-action``’ is requested on an assumption.

Variable: pg-goals-error-regexp

  Regexp indicating that the proof process has identified an error.

Variable: proof-shell-result-start

  Regexp matching start of an output from the prover after pbp commands.
  In particular, after a ‘``pbp-goal-command``’ or a ‘``pbp-hyp-command``’.

Variable: proof-shell-result-end

  Regexp matching end of output from the prover after pbp commands.
  In particular, after a ‘``pbp-goal-command``’ or a ‘``pbp-hyp-command``’.

Variable: pg-subterm-start-char

  Opening special character for subterm markup.
  Subsequent special characters with values below `pg-subterm-first-special-char` are assumed to be subterm position indicators. Annotations should be finished with `pg-subterm-sep-char`; the end of the concrete syntax is indicated by `pg-subterm-end-char`.

  If ‘``pg-subterm-start-char``’ is nil, subterm markup is disabled.

  See doc of ‘``pg-assoc-analyse-structure``’ for more details of subterm and proof-by-pointing markup mechanisms..

Variable: pg-subterm-sep-char

  Finishing special for a subterm markup.
  See doc of ‘``pg-subterm-start-char``’.

Variable: pg-topterm-regexp

  Annotation regexp that indicates the beginning of a "top" element.
  A "top" element may be a sub-goal to be proved or a named hypothesis, for example. It could also be a literal command to insert and send back to the prover.

  The function ‘``pg-topterm-goalhyplit-fn``’ examines text following this special character, to determine what kind of top element it is.

  This setting is also used to see if proof-by-pointing features are configured. If it is unset, some of the code for parsing the prover output is disabled.

Variable: pg-subterm-end-char

  Closing special character for subterm markup.
  See ‘``pg-subterm-start-char``’.

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