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Do not compile libraries as plugins, overhaul git version system
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| # git_watcher.cmake | ||
| # | ||
| # License: MIT | ||
| # Source: https://raw.githubusercontent.com/andrew-hardin/cmake-git-version-tracking/master/git_watcher.cmake | ||
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| # This file defines the functions and targets needed to monitor | ||
| # the state of a git repo. If the state changes (e.g. a commit is made), | ||
| # then a file gets reconfigured. | ||
| # | ||
| # The behavior of this script can be modified by defining any of these variables: | ||
| # | ||
| # PRE_CONFIGURE_FILE (REQUIRED) | ||
| # -- The path to the file that'll be configured. | ||
| # | ||
| # POST_CONFIGURE_FILE (REQUIRED) | ||
| # -- The path to the configured PRE_CONFIGURE_FILE. | ||
| # | ||
| # GIT_STATE_FILE (OPTIONAL) | ||
| # -- The path to the file used to store the previous build's git state. | ||
| # Defaults to the current binary directory. | ||
| # | ||
| # GIT_WORKING_DIR (OPTIONAL) | ||
| # -- The directory from which git commands will be run. | ||
| # Defaults to the directory with the top level CMakeLists.txt. | ||
| # | ||
| # GIT_EXECUTABLE (OPTIONAL) | ||
| # -- The path to the git executable. It'll automatically be set if the | ||
| # user doesn't supply a path. | ||
| # | ||
| # Script design: | ||
| # - This script was designed similar to a Python application | ||
| # with a Main() function. I wanted to keep it compact to | ||
| # simplify "copy + paste" usage. | ||
| # | ||
| # - This script is made to operate in two CMake contexts: | ||
| # 1. Configure time context (when build files are created). | ||
| # 2. Build time context (called via CMake -P) | ||
| # If you see something odd (e.g. the NOT DEFINED clauses), | ||
| # consider that it can run in one of two contexts. | ||
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| # Short hand for converting paths to absolute. | ||
| macro(PATH_TO_ABSOLUTE var_name) | ||
| get_filename_component(${var_name} "${${var_name}}" ABSOLUTE) | ||
| endmacro() | ||
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| # Check that a required variable is set. | ||
| macro(CHECK_REQUIRED_VARIABLE var_name) | ||
| if(NOT DEFINED ${var_name}) | ||
| message(FATAL_ERROR "The \"${var_name}\" variable must be defined.") | ||
| endif() | ||
| PATH_TO_ABSOLUTE(${var_name}) | ||
| endmacro() | ||
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| # Check that an optional variable is set, or, set it to a default value. | ||
| macro(CHECK_OPTIONAL_VARIABLE var_name default_value) | ||
| if(NOT DEFINED ${var_name}) | ||
| set(${var_name} ${default_value}) | ||
| endif() | ||
| PATH_TO_ABSOLUTE(${var_name}) | ||
| endmacro() | ||
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| CHECK_REQUIRED_VARIABLE(PRE_CONFIGURE_FILE) | ||
| CHECK_REQUIRED_VARIABLE(POST_CONFIGURE_FILE) | ||
| CHECK_OPTIONAL_VARIABLE(GIT_STATE_FILE "${CMAKE_BINARY_DIR}/git-state") | ||
| CHECK_OPTIONAL_VARIABLE(GIT_WORKING_DIR "${CMAKE_SOURCE_DIR}") | ||
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| # Check the optional git variable. | ||
| # If it's not set, we'll try to find it using the CMake packaging system. | ||
| if(NOT DEFINED GIT_EXECUTABLE) | ||
| find_package(Git QUIET REQUIRED) | ||
| endif() | ||
| CHECK_REQUIRED_VARIABLE(GIT_EXECUTABLE) | ||
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| # Function: GitStateChangedAction | ||
| # Description: this function is executed when the state of the git | ||
| # repo changes (e.g. a commit is made). | ||
| function(GitStateChangedAction _state_as_list) | ||
| # Set variables by index, then configure the file w/ these variables defined. | ||
| LIST(GET _state_as_list 0 GIT_RETRIEVED_STATE) | ||
| LIST(GET _state_as_list 1 GIT_HEAD_SHA1) | ||
| LIST(GET _state_as_list 2 GIT_IS_DIRTY) | ||
| configure_file("${PRE_CONFIGURE_FILE}" "${POST_CONFIGURE_FILE}" @ONLY) | ||
| endfunction() | ||
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| # Function: GetGitState | ||
| # Description: gets the current state of the git repo. | ||
| # Args: | ||
| # _working_dir (in) string; the directory from which git commands will be executed. | ||
| # _state (out) list; a collection of variables representing the state of the | ||
| # repository (e.g. commit SHA). | ||
| function(GetGitState _working_dir _state) | ||
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| # Get the hash for HEAD. | ||
| set(_success "true") | ||
| execute_process(COMMAND | ||
| "${GIT_EXECUTABLE}" rev-parse --verify HEAD | ||
| WORKING_DIRECTORY "${_working_dir}" | ||
| RESULT_VARIABLE res | ||
| OUTPUT_VARIABLE _hashvar | ||
| ERROR_QUIET | ||
| OUTPUT_STRIP_TRAILING_WHITESPACE) | ||
| if(NOT res EQUAL 0) | ||
| set(_success "false") | ||
| set(_hashvar "GIT-NOTFOUND") | ||
| endif() | ||
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| # Get whether or not the working tree is dirty. | ||
| execute_process(COMMAND | ||
| "${GIT_EXECUTABLE}" status --porcelain | ||
| WORKING_DIRECTORY "${_working_dir}" | ||
| RESULT_VARIABLE res | ||
| OUTPUT_VARIABLE out | ||
| ERROR_QUIET | ||
| OUTPUT_STRIP_TRAILING_WHITESPACE) | ||
| if(NOT res EQUAL 0) | ||
| set(_success "false") | ||
| set(_dirty "false") | ||
| else() | ||
| if(NOT "${out}" STREQUAL "") | ||
| set(_dirty "true") | ||
| else() | ||
| set(_dirty "false") | ||
| endif() | ||
| endif() | ||
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| # Return a list of our variables to the parent scope. | ||
| set(${_state} ${_success} ${_hashvar} ${_dirty} PARENT_SCOPE) | ||
| endfunction() | ||
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| # Function: CheckGit | ||
| # Description: check if the git repo has changed. If so, update the state file. | ||
| # Args: | ||
| # _working_dir (in) string; the directory from which git commands will be ran. | ||
| # _state_changed (out) bool; whether or no the state of the repo has changed. | ||
| # _state (out) list; the repository state as a list (e.g. commit SHA). | ||
| function(CheckGit _working_dir _state_changed _state) | ||
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| # Get the current state of the repo. | ||
| GetGitState("${_working_dir}" state) | ||
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| # Set the output _state variable. | ||
| # (Passing by reference in CMake is awkward...) | ||
| set(${_state} ${state} PARENT_SCOPE) | ||
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| # Check if the state has changed compared to the backup on disk. | ||
| if(EXISTS "${GIT_STATE_FILE}") | ||
| file(READ "${GIT_STATE_FILE}" OLD_HEAD_CONTENTS) | ||
| if(OLD_HEAD_CONTENTS STREQUAL "${state}") | ||
| # State didn't change. | ||
| set(${_state_changed} "false" PARENT_SCOPE) | ||
| return() | ||
| endif() | ||
| endif() | ||
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| # The state has changed. | ||
| # We need to update the state file on disk. | ||
| # Future builds will compare their state to this file. | ||
| file(WRITE "${GIT_STATE_FILE}" "${state}") | ||
| set(${_state_changed} "true" PARENT_SCOPE) | ||
| endfunction() | ||
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| # Function: SetupGitMonitoring | ||
| # Description: this function sets up custom commands that make the build system | ||
| # check the state of git before every build. If the state has | ||
| # changed, then a file is configured. | ||
| function(SetupGitMonitoring) | ||
| add_custom_target(check_git_repository | ||
| ALL | ||
| DEPENDS ${PRE_CONFIGURE_FILE} | ||
| BYPRODUCTS ${POST_CONFIGURE_FILE} | ||
| COMMENT "Checking the git repository for changes..." | ||
| COMMAND | ||
| ${CMAKE_COMMAND} | ||
| -D_BUILD_TIME_CHECK_GIT=TRUE | ||
| -DGIT_WORKING_DIR=${GIT_WORKING_DIR} | ||
| -DGIT_EXECUTABLE=${GIT_EXECUTABLE} | ||
| -DGIT_STATE_FILE=${GIT_STATE_FILE} | ||
| -DPRE_CONFIGURE_FILE=${PRE_CONFIGURE_FILE} | ||
| -DPOST_CONFIGURE_FILE=${POST_CONFIGURE_FILE} | ||
| -P "${CMAKE_CURRENT_LIST_FILE}") | ||
| endfunction() | ||
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| # Function: Main | ||
| # Description: primary entry-point to the script. Functions are selected based | ||
| # on whether it's configure or build time. | ||
| function(Main) | ||
| if(_BUILD_TIME_CHECK_GIT) | ||
| # Check if the repo has changed. | ||
| # If so, run the change action. | ||
| CheckGit("${GIT_WORKING_DIR}" did_change state) | ||
| if(did_change) | ||
| GitStateChangedAction("${state}") | ||
| endif() | ||
| else() | ||
| # >> Executes at configure time. | ||
| SetupGitMonitoring() | ||
| endif() | ||
| endfunction() | ||
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| main() |
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