grdhisteq -D<table> writes to standard output

[maxrjones]

Description of the problem

Even when <table> is provided after -D for grdhisteq, the output still gets sent to standard output. Should the docs or code be updated? This is the current description in the usage message:

  -D[<table>]
     Dump level information to <table> or standard output if not given.

Full script that generated the error

gmt grdhisteq @earth_relief_01d -R-5/5/-5/5 -Dtest.txt

Actual outcome

Result written to standard output.

Expected outcome

Result written to test.txt

System information

• Operating system: macOS
• GMT version (gmt --version): 6.3

[PaulWessel]

Hm, can confirm what you say. Not sure why the table file is not used - will need to debug. It is an old module that Walter wrote that probably should be refactored so that output can happen in the main and not hidden inside a function that does the computation (this all predates the API).