[GRASS-dev] [GRASS GIS] #1719: GRASS 7 Monitor command line support

[GRASS GIS]

#1719: GRASS 7 Monitor command line support
--------------------------+-------------------------------------------------
  Reporter:  annalisapg   |       Owner:  grass-dev@…                            
      Type:  enhancement  |      Status:  reopened                               
  Priority:  normal       |   Milestone:  7.0.0                                  
 Component:  wxGUI        |     Version:  svn-trunk                              
Resolution:               |    Keywords:  d.mon, display, d.* commands, rendering
  Platform:  Unspecified  |         Cpu:  Unspecified                            
--------------------------+-------------------------------------------------

Comment(by glynn):

 Replying to [comment:30 wenzeslaus]:

 > It would be great if you would elaborate more on this idea now or in the
 future. (I'm not sure if I can extend it and consider all the issues.) For
 example, how switching between different `wx*` monitors and other
 applications (ximgview, g.gui) would be solved?

 By changing the GRASS_RENDER_COMMAND variable, or by changing settings
 which are used by that program. If we want to provide the equivalent of
 "d.mon", any variables should probably be GRASS variables so that they can
 be changed by a module (environment variables can only be changed via the
 parent shell).

 > > The main reason for delegating to an external command is that it
 avoids enforcing a specific communication protocol, or embedding the
 details into lib/display, which would be an issue for high-level protocols
 such as Windows' DDE or Python's pickle format.
 >
 > But still, wouldn't be Windows' DDE or Python's pickle even more fragile
 (in any sense) than the current file-based approach?

 I don't think so. Using files for inter-program communication is a bit of
 a hack (e.g. there's no way to tell if the "reader" has died).

-- 
Ticket URL: <https://trac.osgeo.org/grass/ticket/1719#comment:31>
GRASS GIS <http://grass.osgeo.org>