filter graphviz dot file

Question

I have a project meson based, and I am able to generate using ninja a dot file

ninja -t graph myExecutable | dot -Tpng -ograph.png

Now I would like to filter the dot file to exclude all the obj files in order to have only the library and the executable. Is it possible to filter the generated dot file?

this is an example of the output of ninja -t graph myExecutable that i need to filter

digraph ninja {
rankdir="LR"
node [fontsize=10, shape=box, height=0.25]
edge [fontsize=10]
"0x55f191f3ea60" [label="myexec"]
"0x55f191f3e9f0" [label="c_LINKER", shape=ellipse]
"0x55f191f3e9f0" -> "0x55f191f3ea60"
"0x55f191f3e6a0" -> "0x55f191f3e9f0" [arrowhead=none]
"0x55f191f3d5d0" -> "0x55f191f3e9f0" [arrowhead=none]
"0x55f191f3e6a0" [label="myexec.p/src_myexec.c.o"]
"0x55f191f3e730" -> "0x55f191f3e6a0" [label=" c_COMPILER"]
"0x55f191f3e730" [label="../src/myexec.c"]
"0x55f191f3d5d0" [label="subprojects/mylib/libmylib.so.p/libmylib.so.symbols"]
"0x55f191f3d6d0" -> "0x55f191f3d5d0" [label=" SHSYM"]
"0x55f191f3d6d0" [label="subprojects/mylib/libmylib.so"]
"0x55f191f3d220" -> "0x55f191f3d6d0" [label=" c_LINKER"]
"0x55f191f3d220" [label="subprojects/mylib/libmylib.so.p/src_library.c.o"]
"0x55f191f3d320" -> "0x55f191f3d220" [label=" c_COMPILER"]
"0x55f191f3d320" [label="../subprojects/mylib/src/library.c"]
}
~  

I would like to remove all *.c *.o reference

Answer 1

Here is a gvpr program (part of the Graphviz system - https://www.graphviz.org/pdf/gvpr.1.pdf) that will delete all nodes with labels that end in .o or .c.
It takes your ninja output and produces a filtered input suitable as input to dot. Note:

• gvpr uses ksh (bash?) pattern matching syntax
• once a node is deleted, any edges to/from that node are automatically deleted also. This may not me exactly what you want

gvpr -c 'N{if($.label=="@(*.[co])")delete($G,$);}' ninja.gv |dot -Tpng >ninja.png

or

ninja -t graph myExecutable | gvpr -c 'N{if($.label=="@(*.[co])")delete($G,$);}' |dot -Tpng >ninja.png

Before: After: