This command is needed on Apple M2 machines

It is not clear why. Perhaps an error in the ARM64 package, and thus doesn't
show else where.

This change fixes the problem for Hans on a M2 machine. (Apple intel is working
fine without it, and so is Linux as we know from the CI.)

create.sh

@@ -1,5 +1,6 @@
 #!/bin/bash
 
+
 # paths to emmocheck and ontodoc (from https://github.com/emmo-repo/EMMOntoPy)
 CHECK=emmocheck
 
@@ -14,6 +15,10 @@ ls -ls magnetic_material_mammos.ttl
 echo "checking ontology ..."
 $CHECK magnetic_material_mammos.ttl
 
+
+# on ARM Mac, this seems required once to build documentation
+doc -c
+
 echo "building documentation ..."
 cd doc
 python ./mammosdoc --template=mammos.md --local --format=html ../magnetic_material_mammos.ttl magnetic_material_mammos.html

pixi.toml

@@ -9,7 +9,8 @@ version = "0.1.0"
 [tasks]
 build = "python src/build_onto.py"
 check = "emmocheck magnetic_material_mammos.ttl"
-docs = {cmd = "python mammosdoc --template=mammos.md --local --format=html ../magnetic_material_mammos.ttl magnetic_material_mammos.html", cwd = "doc"}
+init_dot = "dot -c"  # needed on Mac M2 before graphviz can be used
+docs = {cmd = "python mammosdoc --template=mammos.md --local --format=html ../magnetic_material_mammos.ttl magnetic_material_mammos.html", cwd = "doc", depends_on = ['init_dot']}
 clean = "rm -f demo.sqlite3 magnetic_material_mammos.ttl doc/magnetic_material_mammos.html"
 
 # convenience target: run all steps subsequently