[brlcad-commits] SF.net SVN: brlcad:[37510] brlcad/trunk/TODO

[<br...@us...>]

Revision: 37510
          http://brlcad.svn.sourceforge.net/brlcad/?rev=37510&view=rev
Author:   brlcad
Date:     2010-01-29 23:40:41 +0000 (Fri, 29 Jan 2010)

Log Message:
-----------
flesh out even more details on a batch command.  show how it relates to search and show how it could have really powerful stream processing capabilities of awk, sed, and cut.  becomes a way to pipe and invoke ged commands without a shell.

Modified Paths:
--------------
    brlcad/trunk/TODO

Modified: brlcad/trunk/TODO
===================================================================
--- brlcad/trunk/TODO	2010-01-29 23:09:09 UTC (rev 37509)
+++ brlcad/trunk/TODO	2010-01-29 23:40:41 UTC (rev 37510)
@@ -62,11 +62,36 @@
   this would let you do things like:
 
   # same as mvall -f file.txt
-  batch file.txt -exec mvall {} \;
+  batch file.txt -exec "mvall \$*"
+  
+  # create an alternate hierarchy based on some mapping file
+  batch file.txt -exec "g \$*"
 
   # for all lines in 3 files, kill first symbol, rename second to it
-  batch A.txt B.txt C.txt -exec kill $1 \; -exec mv $2 $1 \;
+  batch A.txt B.txt C.txt -exec "kill \$1" -exec "mv \$2 \$1"
 
+  # keep all objects in an edcodes file with region ID > 1000
+  batch A.txt -field 2 -ne 1000 -exec "keep subset.g \$5"
+
+  # for all regions, if they are listed in file.txt, add them to a
+  # parent assembly and set a specified material ID
+  search . -name "*.r" -exec batch file.txt -field 1 -eq {} -exec "g \$1 {}" -exec "mater {} \$3" \;
+
+  # run awk, get 4th column, run sed to change name, 
+  batch file.txt -awk '{print $4}' -sed 's/^r\.(.*)/\1\.r/g' -exec "mv \$1 \$$"
+
+  # outside of MGED, the above would have been similar to:
+  cat file.txt | awk '{print $4}' | sed 's/^r\.(.*)/r\.\1 \1\.r/g' | xargs mged test.g mv
+
+  The command becomes more of a stream processor on the input file, as
+  if piped on the shell line.  To embed awk, sed, cut, see qse:
+          http://code.google.com/p/qse/
+
+  The search and batch commands probably can't nor shouldn't use the
+  same replacement markers, with batch using $*, $1, $2, etc, to
+  represent file columns (in a poor man's awk fashion) and search
+  simply using "{}" as the the object name replacement marker.
+
 * fix !!! in src/libged/tables.c where a temporary file is getting
   used.  needs to call bu_temp_file().
 


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