diff --git a/.gersemi/definitions.cmake b/.gersemi/definitions.cmake
new file mode 100644
index 0000000000..13061629a4
--- /dev/null
+++ b/.gersemi/definitions.cmake
@@ -0,0 +1,98 @@
+# Custom CMake command definitions for gersemi formatting.
+# These stubs teach gersemi the signatures of project-specific commands
+# so it can format their invocations correctly.
+
+function(git_branch branch_val)
+endfunction()
+
+function(isolate_headers target A B scope)
+endfunction()
+
+function(create_symbolic_link target link)
+endfunction()
+
+function(xrpl_add_test name)
+endfunction()
+
+macro(exclude_from_default target_)
+endmacro()
+
+macro(exclude_if_included target_)
+endmacro()
+
+function(target_protobuf_sources target prefix)
+    set(options APPEND_PATH DESCRIPTORS)
+    set(oneValueArgs
+        LANGUAGE
+        OUT_VAR
+        EXPORT_MACRO
+        TARGET
+        PROTOC_OUT_DIR
+        PLUGIN
+        PLUGIN_OPTIONS
+        PROTOC_EXE
+    )
+    set(multiValueArgs
+        PROTOS
+        IMPORT_DIRS
+        GENERATE_EXTENSIONS
+        PROTOC_OPTIONS
+        DEPENDENCIES
+    )
+    cmake_parse_arguments(
+        THIS_FUNCTION_PREFIX
+        "${options}"
+        "${oneValueArgs}"
+        "${multiValueArgs}"
+        ${ARGN}
+    )
+endfunction()
+
+function(add_module parent name)
+endfunction()
+
+function(target_link_modules parent scope)
+endfunction()
+
+function(setup_target_for_coverage_gcovr)
+    set(options NONE)
+    set(oneValueArgs BASE_DIRECTORY NAME FORMAT)
+    set(multiValueArgs EXCLUDE EXECUTABLE EXECUTABLE_ARGS DEPENDENCIES)
+    cmake_parse_arguments(
+        THIS_FUNCTION_PREFIX
+        "${options}"
+        "${oneValueArgs}"
+        "${multiValueArgs}"
+        ${ARGN}
+    )
+endfunction()
+
+function(add_code_coverage_to_target name scope)
+endfunction()
+
+function(verbose_find_path variable name)
+    set(options
+        NO_CACHE
+        REQUIRED
+        OPTIONAL
+        NO_DEFAULT_PATH
+        NO_PACKAGE_ROOT_PATH
+        NO_CMAKE_PATH
+        NO_CMAKE_ENVIRONMENT_PATH
+        NO_SYSTEM_ENVIRONMENT_PATH
+        NO_CMAKE_SYSTEM_PATH
+        NO_CMAKE_INSTALL_PREFIX
+        CMAKE_FIND_ROOT_PATH_BOTH
+        ONLY_CMAKE_FIND_ROOT_PATH
+        NO_CMAKE_FIND_ROOT_PATH
+    )
+    set(oneValueArgs REGISTRY_VIEW VALIDATOR DOC)
+    set(multiValueArgs NAMES HINTS PATHS PATH_SUFFIXES)
+    cmake_parse_arguments(
+        THIS_FUNCTION_PREFIX
+        "${options}"
+        "${oneValueArgs}"
+        "${multiValueArgs}"
+        ${ARGN}
+    )
+endfunction()
diff --git a/.gersemirc b/.gersemirc
new file mode 100644
index 0000000000..5abd52ffd5
--- /dev/null
+++ b/.gersemirc
@@ -0,0 +1 @@
+definitions: [.gersemi]
diff --git a/cmake/XrplAddTest.cmake b/cmake/XrplAddTest.cmake
index 0f8f9e2c01..2f1209e03c 100644
--- a/cmake/XrplAddTest.cmake
+++ b/cmake/XrplAddTest.cmake
@@ -11,7 +11,12 @@ function(xrpl_add_test name)
     )
     add_executable(${target} ${ARGN} ${sources})
 
-    isolate_headers(${target} "${CMAKE_SOURCE_DIR}" "${CMAKE_SOURCE_DIR}/tests/${name}" PRIVATE)
+    isolate_headers(
+        ${target}
+        "${CMAKE_SOURCE_DIR}"
+        "${CMAKE_SOURCE_DIR}/tests/${name}"
+        PRIVATE
+    )
 
     add_test(NAME ${target} COMMAND ${target})
 endfunction()
diff --git a/cmake/XrplCore.cmake b/cmake/XrplCore.cmake
index 1c8f5e33d6..580c4155eb 100644
--- a/cmake/XrplCore.cmake
+++ b/cmake/XrplCore.cmake
@@ -10,16 +10,25 @@ include(target_protobuf_sources)
 # so we just build them as a separate library.
 add_library(xrpl.libpb)
 set_target_properties(xrpl.libpb PROPERTIES UNITY_BUILD OFF)
-target_protobuf_sources(xrpl.libpb xrpl/proto LANGUAGE cpp IMPORT_DIRS include/xrpl/proto
-                        PROTOS include/xrpl/proto/xrpl.proto
+target_protobuf_sources(
+    xrpl.libpb
+    xrpl/proto
+    LANGUAGE cpp
+    IMPORT_DIRS include/xrpl/proto
+    PROTOS include/xrpl/proto/xrpl.proto
 )
 
 file(GLOB_RECURSE protos "include/xrpl/proto/org/*.proto")
-target_protobuf_sources(xrpl.libpb xrpl/proto LANGUAGE cpp IMPORT_DIRS include/xrpl/proto
-                        PROTOS "${protos}"
+target_protobuf_sources(
+    xrpl.libpb
+    xrpl/proto
+    LANGUAGE cpp
+    IMPORT_DIRS include/xrpl/proto
+    PROTOS "${protos}"
 )
 target_protobuf_sources(
-    xrpl.libpb xrpl/proto
+    xrpl.libpb
+    xrpl/proto
     LANGUAGE grpc
     IMPORT_DIRS include/xrpl/proto
     PROTOS "${protos}"
diff --git a/cmake/XrplCov.cmake b/cmake/XrplCov.cmake
index 109f5049fd..d81d7e689f 100644
--- a/cmake/XrplCov.cmake
+++ b/cmake/XrplCov.cmake
@@ -39,19 +39,15 @@ list(
 )
 
 setup_target_for_coverage_gcovr(
-    NAME
-    coverage
-    FORMAT
-    ${coverage_format}
+    NAME coverage
+    FORMAT ${coverage_format}
     EXCLUDE
-    "src/test"
-    "src/tests"
-    "include/xrpl/beast/test"
-    "include/xrpl/beast/unit_test"
-    "${CMAKE_BINARY_DIR}/pb-xrpl.libpb"
-    DEPENDENCIES
-    xrpld
-    xrpl.tests
+        "src/test"
+        "src/tests"
+        "include/xrpl/beast/test"
+        "include/xrpl/beast/unit_test"
+        "${CMAKE_BINARY_DIR}/pb-xrpl.libpb"
+    DEPENDENCIES xrpld xrpl.tests
 )
 
 add_code_coverage_to_target(opts INTERFACE)
diff --git a/cmake/XrplDocs.cmake b/cmake/XrplDocs.cmake
index aefffba81b..7b3e9b3b30 100644
--- a/cmake/XrplDocs.cmake
+++ b/cmake/XrplDocs.cmake
@@ -42,7 +42,11 @@ function(verbose_find_path variable name)
     endif()
 endfunction()
 
-verbose_find_path(doxygen_plantuml_jar_path plantuml.jar PATH_SUFFIXES share/plantuml)
+verbose_find_path(
+    doxygen_plantuml_jar_path
+    plantuml.jar
+    PATH_SUFFIXES share/plantuml
+)
 verbose_find_path(doxygen_dot_path dot)
 
 # https://en.cppreference.com/w/Cppreference:Archives
diff --git a/cmake/add_module.cmake b/cmake/add_module.cmake
index 5b1864a0bb..316d6c627b 100644
--- a/cmake/add_module.cmake
+++ b/cmake/add_module.cmake
@@ -25,10 +25,16 @@ function(add_module parent name)
         ${target}
         PUBLIC "$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>"
     )
-    isolate_headers(${target} "${CMAKE_CURRENT_SOURCE_DIR}/include"
-                    "${CMAKE_CURRENT_SOURCE_DIR}/include/${parent}/${name}" PUBLIC
+    isolate_headers(
+        ${target}
+        "${CMAKE_CURRENT_SOURCE_DIR}/include"
+        "${CMAKE_CURRENT_SOURCE_DIR}/include/${parent}/${name}"
+        PUBLIC
     )
-    isolate_headers(${target} "${CMAKE_CURRENT_SOURCE_DIR}/src"
-                    "${CMAKE_CURRENT_SOURCE_DIR}/src/lib${parent}/${name}" PRIVATE
+    isolate_headers(
+        ${target}
+        "${CMAKE_CURRENT_SOURCE_DIR}/src"
+        "${CMAKE_CURRENT_SOURCE_DIR}/src/lib${parent}/${name}"
+        PRIVATE
     )
 endfunction()