[GRASS-dev] [GRASS GIS] #3417: t.merge and t.rast.algebra: enhance error message when output stds already exists

[GRASS GIS]

#3417: t.merge and t.rast.algebra: enhance error message when output stds already
exists
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 Reporter:  veroandreo              |      Owner:  grass-dev@…
     Type:  enhancement             |     Status:  new
 Priority:  normal                  |  Milestone:  7.4.0
Component:  Default                 |    Version:  unspecified
 Keywords:  t.merge, error message  |        CPU:  Unspecified
 Platform:  Unspecified             |
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 If the output stds already exists, G7:t.merge stops with the following:

 {{{
 t.merge inputs=daily_zeros_apr2003_oct2016,wnv_indicator_eip13
 output=eip13_noholes
 Traceback (most recent call last):
   File "/home/veroandreo/software/grass7_trunk/dist.x86_64-pc-linux-
 gnu/scripts/t.merge", line 147, in <module>
     main()
   File "/home/veroandreo/software/grass7_trunk/dist.x86_64-pc-linux-
 gnu/scripts/t.merge", line 104, in main
     (stds.get_new_map_instance(None).get_type(), output_id))
   File "/home/veroandreo/software/grass7_trunk/dist.x86_64-pc-linux-
 gnu/etc/python/grass/script/core.py", line 663, in fatal
     raise ScriptError(msg)
 grass.exceptions.ScriptError: Unable to merge maps into space time raster
 dataset <eip13_noholes at nuevo_lst> please use the overwrite flag.
 }}}

 Something very similar happens with G7:t.rast.algebra. Is it possible to
 make these messages nicer, so the user only gets the last part of it,
 i.e.: the error, as in other modules?

 I use trunk r71485 in a Fedora25 box.

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Ticket URL: <https://trac.osgeo.org/grass/ticket/3417>
GRASS GIS <https://grass.osgeo.org>