Add dummy files to preserve vendor directories

imgui/govendorkeep.go

@@ -0,0 +1 @@
+package cgoimgui

imgui/misc/freetype/govendorkeep.go

@@ -0,0 +1 @@
+package cgofreetype

update_imgui.sh

@@ -25,10 +25,12 @@ rm -rf $DEST/*
 echo "Copying files"
 # Copy core files
 cp $TMP_IMGUI/*.{h,cpp} $DEST/
+echo "package cgo${DEST}" > $DEST/govendorkeep.go
 
 # Copy freetype
 mkdir -p $DEST/misc/freetype
 cp $TMP_IMGUI/misc/freetype/*.{h,cpp} $DEST/misc/freetype
+echo "package cgofreetype" > $DEST/misc/freetype/govendorkeep.go
 
 # Copy license
 cp $TMP_IMGUI/LICENSE.txt _licenses/imgui-LICENSE.txt

wrapper/govendorkeep.go

@@ -0,0 +1 @@
+package cgowrapper

wrapper_cgo_hack.go

@@ -0,0 +1,20 @@
+// +build required
+
+package imgui
+
+// This file exists purely to prevent the golang toolchain from stripping
+// away the c source directories and files when `go mod vendor` is used
+// to populate a `vendor/` directory of a project depending on `imgui-go`.
+// https://github.com/golang/go/issues/26366
+//
+// How it works:
+//  - every directory which only includes c source files receives a dummy.go file.
+//  - every directory we want to preserve is included here as a _ import.
+//  - this file is given a build to exclude it from the regular build.
+
+import (
+	// Prevent go tooling from stripping out the c source files.
+	_ "github.com/inkyblackness/imgui-go/v4/imgui"
+	_ "github.com/inkyblackness/imgui-go/v4/wrapper"
+	_ "github.com/inkyblackness/imgui-go/v4/imgui/misc/freetype"
+)