build: ensure `make clean` doesn't remove source files

Adding a file to `OUTPUT` in `add_custom_command` marks that file as
`GENERATED` in cmake, and will thus be removed when running the `clean`
target. As cmake doesn't have a good way to mark that certain files
should not be removed, we instead "lie" to it by omitting the files we
want to keep from `OUTPUT`. This hack only works as long as there aren't
any other files that depend on the generated files we want to keep,
which currently seems to be the case. If this assumption changes in the
future, then we need to separate the parts that are generated and the
parts that are not as to prevent an infinite dependency chain.

1 files changed, 14 insertions, 19 deletions

diff --git a/src/nvim/CMakeLists.txt b/src/nvim/CMakeLists.txt
index 2e795bacd3..53ff761b16 100644
--- a/src/nvim/CMakeLists.txt
+++ b/src/nvim/CMakeLists.txt
@@ -284,6 +284,7 @@ set(BINARY_LIB_DIR ${PROJECT_BINARY_DIR}/lib/nvim/)
 set(GENERATED_DIR ${PROJECT_BINARY_DIR}/src/nvim/auto)
 set(GENERATED_INCLUDES_DIR ${PROJECT_BINARY_DIR}/include)
 set(GENERATOR_DIR ${CMAKE_CURRENT_LIST_DIR}/generators)
+set(GEN_EVAL_TOUCH ${TOUCHES_DIR}/gen_doc_eval)
 set(LUAJIT_RUNTIME_DIR ${DEPS_PREFIX}/share/luajit-2.1/jit)
 set(NVIM_RUNTIME_DIR ${PROJECT_SOURCE_DIR}/runtime)
 set(UNICODE_DIR ${PROJECT_SOURCE_DIR}/src/unicode)
@@ -892,18 +893,21 @@ add_custom_target(generated-sources DEPENDS
 )
 
 set(VIMDOC_FILES
-  ${NVIM_RUNTIME_DIR}/doc/api.mpack
   ${NVIM_RUNTIME_DIR}/doc/api.txt
-  ${NVIM_RUNTIME_DIR}/doc/diagnostic.mpack
   ${NVIM_RUNTIME_DIR}/doc/diagnostic.txt
-  ${NVIM_RUNTIME_DIR}/doc/lsp.mpack
   ${NVIM_RUNTIME_DIR}/doc/lsp.txt
-  ${NVIM_RUNTIME_DIR}/doc/lua.mpack
   ${NVIM_RUNTIME_DIR}/doc/lua.txt
-  ${NVIM_RUNTIME_DIR}/doc/treesitter.mpack
   ${NVIM_RUNTIME_DIR}/doc/treesitter.txt
 )
 
+set(MPACK_FILES
+  ${NVIM_RUNTIME_DIR}/doc/api.mpack
+  ${NVIM_RUNTIME_DIR}/doc/diagnostic.mpack
+  ${NVIM_RUNTIME_DIR}/doc/lsp.mpack
+  ${NVIM_RUNTIME_DIR}/doc/lua.mpack
+  ${NVIM_RUNTIME_DIR}/doc/treesitter.mpack
+)
+
 file(GLOB API_SOURCES CONFIGURE_DEPENDS ${PROJECT_SOURCE_DIR}/src/nvim/api/*.c)
 
 file(GLOB LUA_SOURCES CONFIGURE_DEPENDS
@@ -914,28 +918,19 @@ file(GLOB LUA_SOURCES CONFIGURE_DEPENDS
 )
 
 add_custom_command(
-  OUTPUT ${VIMDOC_FILES}
+  OUTPUT ${MPACK_FILES}
   COMMAND ${PROJECT_SOURCE_DIR}/scripts/gen_vimdoc.py
   DEPENDS
     nvim
     ${API_SOURCES}
     ${LUA_SOURCES}
+    ${VIMDOC_FILES}
   WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
 )
 
-set(GEN_EVAL_FILES
-  ${NVIM_RUNTIME_DIR}/doc/builtin.txt
-  ${NVIM_RUNTIME_DIR}/doc/options.txt
-  ${NVIM_RUNTIME_DIR}/doc/vvars.txt
-  ${NVIM_RUNTIME_DIR}/lua/vim/_meta/api.lua
-  ${NVIM_RUNTIME_DIR}/lua/vim/_meta/api_keysets.lua
-  ${NVIM_RUNTIME_DIR}/lua/vim/_meta/options.lua
-  ${NVIM_RUNTIME_DIR}/lua/vim/_meta/vimfn.lua
-  ${NVIM_RUNTIME_DIR}/lua/vim/_meta/vvars.lua
-)
-
 add_custom_command(
-  OUTPUT ${GEN_EVAL_FILES}
+  OUTPUT ${GEN_EVAL_TOUCH}
+  COMMAND ${CMAKE_COMMAND} -E touch ${GEN_EVAL_TOUCH}
   COMMAND $<TARGET_FILE:nvim> -l ${PROJECT_SOURCE_DIR}/scripts/gen_eval_files.lua
   DEPENDS
     ${API_METADATA}
@@ -947,7 +942,7 @@ add_custom_command(
   WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
 )
 
-add_custom_target(doc-eval DEPENDS ${GEN_EVAL_FILES})
+add_custom_target(doc-eval DEPENDS ${GEN_EVAL_TOUCH})
 add_custom_target(doc-vim DEPENDS ${VIMDOC_FILES})
 add_custom_target(doc)
 add_dependencies(doc doc-vim doc-eval)