The Gmsh module provides a Morpho interface to use the Gmsh API.
The GmshLoader object initializes gmsh if it's not already and opens the file filename in the gmsh API.
var gm = GmshLoader("gmshmesh.msh")
This doesn't launch the gmsh GUI, just loads the file.
The launch method launches the gmsh GUI. Any modifications done to the mesh in the GUI will be stored even after closing the GUI.
The buildMorphoMesh method creates a Morpho mesh from gmsh's mesh and returns it. (Note: this will behave in an unexpected way if the gmsh mesh has any elements that are not simplicial (eg. quadrangles, pyramids, etc).)
The exportToMorpho method takes an input filename, builds the Morpho mesh and exports it in the .mesh format.
gm.exportToMorpho("morphomesh.mesh")