From 8ecf02be27c9d4eec38b33afb648b01341f6cb46 Mon Sep 17 00:00:00 2001
From: Fredrik Ekre <ekrefredrik@gmail.com>
Date: Thu, 29 Sep 2022 14:42:03 +0200
Subject: [PATCH] Automatically prepend a program name to args in
 Gmsh.initialize.

---
 src/Gmsh.jl      | 14 +++++++++++++-
 test/runtests.jl |  7 ++++++-
 2 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/src/Gmsh.jl b/src/Gmsh.jl
index b18838f..9691051 100644
--- a/src/Gmsh.jl
+++ b/src/Gmsh.jl
@@ -14,14 +14,26 @@ already initialized.
 
 The argument vector `argv` is passed to `gmsh.initialize`. `argv` can be used to pass
 command line options to Gmsh, see [Gmsh documentation for more
-details](https://gmsh.info/doc/texinfo/gmsh.html#index-Command_002dline-options).
+details](https://gmsh.info/doc/texinfo/gmsh.html#index-Command_002dline-options). Note that
+this wrapper prepends the program name to `argv` since Gmsh expects that to be the first
+entry.
 
 If `finalize_atexit` is `true` a Julia exit hook is added, which calls `finalize()`.
+
+**Example**
+```julia
+Gmsh.initialize(["-v", "0"]) # initialize with decreased verbosity
+```
 """
 function initialize(argv=String[]; finalize_atexit=true)
     if Bool(gmsh.isInitialized())
         return false
     end
+    # Prepend a dummy program name in case argv only contains options
+    # see https://gitlab.onelab.info/gmsh/gmsh/-/issues/2112
+    if length(argv) > 0 && startswith(first(argv), "-")
+        argv = pushfirst!(copy(argv), "gmsh")
+    end
     gmsh.initialize(argv)
     if finalize_atexit
         atexit(finalize)
diff --git a/test/runtests.jl b/test/runtests.jl
index 3ced156..e91368a 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -30,9 +30,14 @@ rm(path, recursive=true)
     @test Bool(gmsh.isInitialized())
     @test length(Base.atexit_hooks) == l
     Gmsh.finalize()
-    # argv
+    # argv with program name
     @test Gmsh.initialize(["gmsh", "-v", "0"])
     @test Bool(gmsh.isInitialized())
     @test gmsh.option.getNumber("General.Verbosity") == 0
     Gmsh.finalize()
+    # argv without program name
+    @test Gmsh.initialize(["-v", "2"])
+    @test Bool(gmsh.isInitialized())
+    @test gmsh.option.getNumber("General.Verbosity") == 2
+    Gmsh.finalize()
 end