diff options
Diffstat (limited to 'Modules')
| -rw-r--r-- | Modules/ExternalData.cmake | 41 |
1 files changed, 40 insertions, 1 deletions
diff --git a/Modules/ExternalData.cmake b/Modules/ExternalData.cmake index 741db81..b3206be 100644 --- a/Modules/ExternalData.cmake +++ b/Modules/ExternalData.cmake @@ -155,13 +155,23 @@ calling any of the functions provided by this module. inactivity timeout, in seconds, with a default of ``60`` seconds. Set to ``0`` to disable enforcement. +.. variable:: ExternalData_URL_ALGO_<algo>_<key> + + Specify a custom URL component to be substituted for URL template + placeholders of the form ``%(algo:<key>)``, where ``<key>`` is a + valid C identifier, when fetching an object referenced via hash + algorithm ``<algo>``. If not defined, the default URL component + is just ``<algo>`` for any ``<key>``. + .. variable:: ExternalData_URL_TEMPLATES The ``ExternalData_URL_TEMPLATES`` may be set to provide a list of of URL templates using the placeholders ``%(algo)`` and ``%(hash)`` in each template. Data fetch rules try each URL template in order by substituting the hash algorithm name for ``%(algo)`` and the hash - value for ``%(hash)``. + value for ``%(hash)``. Alternatively one may use ``%(algo:<key>)`` + with ``ExternalData_URL_ALGO_<algo>_<key>`` variables to gain more + flexibility in remote URLs. Referencing Files ^^^^^^^^^^^^^^^^^ @@ -349,6 +359,25 @@ function(ExternalData_add_target target) "The key must be a valid C identifier.") endif() endif() + + # Store custom algorithm name to URL component maps. + if("${url_template}" MATCHES "%\\(algo:([^)]*)\\)") + set(key "${CMAKE_MATCH_1}") + if(key MATCHES "^[A-Za-z_][A-Za-z0-9_]*$") + string(REPLACE "|" ";" _algos "${_ExternalData_REGEX_ALGO}") + foreach(algo ${_algos}) + if(DEFINED ExternalData_URL_ALGO_${algo}_${key}) + string(CONCAT _ExternalData_CONFIG_CODE "${_ExternalData_CONFIG_CODE}\n" + "set(ExternalData_URL_ALGO_${algo}_${key} \"${ExternalData_URL_ALGO_${algo}_${key}}\")") + endif() + endforeach() + else() + message(FATAL_ERROR + "Bad %(algo:${key}) in URL template:\n" + " ${url_template}\n" + "The transform name must be a valid C identifier.") + endif() + endif() endforeach() # Store configuration for use by build-time script. @@ -904,6 +933,16 @@ function(_ExternalData_download_object name hash algo var_obj) foreach(url_template IN LISTS ExternalData_URL_TEMPLATES) string(REPLACE "%(hash)" "${hash}" url_tmp "${url_template}") string(REPLACE "%(algo)" "${algo}" url "${url_tmp}") + if(url MATCHES "^(.*)%\\(algo:([A-Za-z_][A-Za-z0-9_]*)\\)(.*)$") + set(lhs "${CMAKE_MATCH_1}") + set(key "${CMAKE_MATCH_2}") + set(rhs "${CMAKE_MATCH_3}") + if(DEFINED ExternalData_URL_ALGO_${algo}_${key}) + set(url "${lhs}${ExternalData_URL_ALGO_${algo}_${key}}${rhs}") + else() + set(url "${lhs}${algo}${rhs}") + endif() + endif() message(STATUS "Fetching \"${url}\"") if(url MATCHES "^ExternalDataCustomScript://([A-Za-z_][A-Za-z0-9_]*)/(.*)$") _ExternalData_custom_fetch("${CMAKE_MATCH_1}" "${CMAKE_MATCH_2}" "${tmp}" err errMsg) |