cmake: build tool_hugehelp (ENABLE_MANUAL)

Rather than always outputting an empty manual page for the '-M' option,
generate a full manual page as done by autotools. For simplicity in
CMake, always generate the gzipped page as it will not be used anyway
when zlib is not available.

Signed-off-by: Peter Wu <peter@lekensteyn.nl>

1 files changed, 35 insertions, 6 deletions

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index fceaf10fb..9c1fd54ab 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -1,11 +1,38 @@
 set(EXE_NAME curl)
 
-# First try to locate tool_hugehelp.c to see if it has already been created
-# TODO Find the file WITHOUT adding a cache entry!!! Or else the user can delete the file after the script was first run, and the script won't notice it has gone.
-find_file(HUGEHELP_C_FILE tool_hugehelp.c PATHS . NO_DEFAULT_PATH)
-if (NOT HUGEHELP_C_FILE)
-  message(STATUS "Warning: tool_hugehelp.c file was not generated before. Generating an 'empty' file...")
-  file(WRITE tool_hugehelp.c "/* built-in manual is disabled, blank function */\n#include \"tool_hugehelp.h\"\nvoid hugehelp(void) {}\n\n")
+if(USE_MANUAL)
+  find_package(Perl REQUIRED)
+  # Use the C locale to ensure that only ASCII characters appear in the
+  # embedded text. NROFF and MANOPT are set in the parent CMakeLists.txt
+  add_custom_command(
+    OUTPUT tool_hugehelp.c
+    COMMAND echo "#include \"tool_setup.h\"" > tool_hugehelp.c
+    COMMAND echo "#ifndef HAVE_LIBZ" >> tool_hugehelp.c
+    COMMAND env LC_ALL=C "${NROFF}" ${NROFF_MANOPT}
+            "${CURL_SOURCE_DIR}/docs/curl.1" |
+            "${PERL}" "${CMAKE_CURRENT_SOURCE_DIR}/mkhelp.pl"
+            "${CURL_SOURCE_DIR}/docs/MANUAL" >> tool_hugehelp.c
+    COMMAND echo "#else" >> tool_hugehelp.c
+    COMMAND env LC_ALL=C "${NROFF}" ${NROFF_MANOPT}
+            "${CURL_SOURCE_DIR}/docs/curl.1" |
+            "${PERL}" "${CMAKE_CURRENT_SOURCE_DIR}/mkhelp.pl" -c
+            "${CURL_SOURCE_DIR}/docs/MANUAL" >> tool_hugehelp.c
+    COMMAND echo "#endif /* HAVE_LIBZ */" >> tool_hugehelp.c
+    DEPENDS
+      "${CURL_SOURCE_DIR}/docs/MANUAL"
+      "${CURL_SOURCE_DIR}/docs/curl.1"
+      "${CMAKE_CURRENT_SOURCE_DIR}/mkhelp.pl"
+      "${CMAKE_CURRENT_SOURCE_DIR}/tool_hugehelp.h"
+    VERBATIM)
+else()
+  add_custom_command(
+    OUTPUT tool_hugehelp.c
+    COMMAND echo "/* built-in manual is disabled, blank function */" > tool_hugehelp.c
+    COMMAND echo "#include \"tool_hugehelp.h\"" >> tool_hugehelp.c
+    COMMAND echo "void hugehelp(void) {}" >> tool_hugehelp.c
+    DEPENDS
+      "${CMAKE_CURRENT_SOURCE_DIR}/tool_hugehelp.h"
+    VERBATIM)
 endif()
 
 transform_makefile_inc("Makefile.inc" "${CMAKE_CURRENT_BINARY_DIR}/Makefile.inc.cmake")
@@ -28,6 +55,8 @@ include_directories(
   ${CURL_SOURCE_DIR}/lib        # To be able to reach "curl_setup_once.h"
   ${CURL_BINARY_DIR}/lib        # To be able to reach "curl_config.h"
   ${CURL_BINARY_DIR}/include    # To be able to reach "curl/curlbuild.h"
+  # This is needed as tool_hugehelp.c is generated in the binary dir
+  ${CURL_SOURCE_DIR}/src        # To be able to reach "tool_hugehelp.h"
   )
 
 #Build cURL executable