Excluding lines containing a specific string from REGEX REPLACE in CMake -


this first post have been using stackoverflow years. helping me every time.

i writing script in cmake supposed rewrite portion of .cfg file (it resources.cfg file ogre 3d engine) that:

  • when running config cmake, absolute paths set according system
  • when installing, files copied folder , relative paths set instead

i focus on first part, since both similar. resource file working on:

# resources required sample browser , samples. [essential] zip=stufftochange/media/packs/sdktrays.zip  # resource locations added default path [general] filesystem=../media #local filesystem=stufftochange/media/materials/scripts filesystem=stufftochange/media/materials/textures filesystem=stufftochange/media/models filesystem=stufftochange/media/materials/programs/hlsl_cg  filesystem=stufftochange/media/materials/programs/glsl

my current strategy lines without #local identifier should affected regex replace statement. current code is:

file(read ${cmake_source_dir}/cfg/resources.cfg resources_file) string(regex replace     "/media"     "${ogre_home_backslashes}/media"     resources_file_modified ${resources_file}) file(write ${cmake_source_dir}/cfg/resources.cfg ${resources_file_modified})

which replaces /media occurrences. need replace stufftochange (that can before string media) if #local not @ end of line. tried modify matching expression in lots of ways but, when do, first , last line replaced properly. suspect has line endings.

these of expressions tried, without luck:

([^ #]*)=[^ ]*/media([^#\n$]*) =[^ ]*/media([^#\n$]*) /media([^# ]*) /media([^#\n ]*)

of course used \\1 , \\2 save parts of string want keep.

i did few searches on google , stackoverflow couldn't find proper solution or guide using cmake's regex replace (and documentation basic). idea holy grail match expression be?

cmake's regex syntax , documentation pretty limited. i'd favour turning file's contents list of strings, each string being line in file. iterating these makes regex simpler:

set(sourcefile "${cmake_source_dir}/cfg/resources.cfg") file(read ${sourcefile} contents)  # set variable "esc" ascii value 27 - # unlikely conflict in file contents. string(ascii 27 esc)  # turn contents list of strings, each ending esc. # allows preserve blank lines in file since cmake # automatically prunes empty list items during foreach loop. string(regex replace "\n" "${esc};" contentsaslist "${contents}")  unset(modifiedcontents) foreach(line ${contentsaslist})   # don't modify line if contains #local @ end.   if(not "${line}" matches "#local${esc}$")     string(regex replace "=.*/media" "=${ogre_home_backslashes}/media" line ${line})   endif()   # swap appended esc character out in favour of line feed   string(regex replace "${esc}" "\n" line ${line})   set(modifiedcontents "${modifiedcontents}${line}") endforeach() file(write ${sourcefile} ${modifiedcontents})

if don't care preserving blank lines, can use file(strings ...) read in file, makes life bit simpler:

set(sourcefile "${cmake_source_dir}/cfg/resources.cfg") file(strings ${sourcefile} contents)  unset(modifiedcontents) foreach(line ${contents})   # don't modify line if contains #local @ end.   if(not "${line}" matches "#local$")     string(regex replace         "=.*/media"         "=${ogre_home_backslashes}/media"         line ${line})   endif()   set(modifiedcontents "${modifiedcontents}${line}\n") endforeach() file(write ${sourcefile} ${modifiedcontents})

probably best description of cmake's regex syntax found in docs string.


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