From 795e406e3bbd99024652f44fc121f36cd291c269 Mon Sep 17 00:00:00 2001
From: Johnny Jazeix <jazeix@gmail.com>
Date: Sun, 1 Aug 2021 18:27:49 +0200
Subject: CPack/NSIS: Add option to not display license page

Fixes: #22215
---
 Help/cpack_gen/nsis.rst                             | 6 ++++++
 Help/release/dev/nsis_ignore_install_page.rst       | 6 ++++++
 Modules/Internal/CPack/NSIS.template.in             | 2 +-
 Source/CPack/cmCPackNSISGenerator.cxx               | 7 +++++++
 Tests/CPackNSISGenerator/CMakeLists.txt             | 1 +
 Tests/CPackNSISGenerator/RunCPackVerifyResult.cmake | 9 +++++++++
 6 files changed, 30 insertions(+), 1 deletion(-)
 create mode 100644 Help/release/dev/nsis_ignore_install_page.rst

diff --git a/Help/cpack_gen/nsis.rst b/Help/cpack_gen/nsis.rst
index 02e33ba..05c57c2 100644
--- a/Help/cpack_gen/nsis.rst
+++ b/Help/cpack_gen/nsis.rst
@@ -201,3 +201,9 @@ on Windows Nullsoft Scriptable Install System.
  .. versionadded:: 3.21
 
  If set, specify the name of the NSIS executable. Default is ``makensis``.
+
+.. variable:: CPACK_NSIS_IGNORE_LICENSE_PAGE
+
+ .. versionadded:: 3.22
+
+ If set, do not display the page containing the license during installation.
diff --git a/Help/release/dev/nsis_ignore_install_page.rst b/Help/release/dev/nsis_ignore_install_page.rst
new file mode 100644
index 0000000..2d8a8d0
--- /dev/null
+++ b/Help/release/dev/nsis_ignore_install_page.rst
@@ -0,0 +1,6 @@
+nsis_ignore_install_page
+------------------------
+
+* The :cpack_gen:`CPack NSIS Generator` gained a new variable
+  :variable:`CPACK_NSIS_IGNORE_LICENSE_PAGE` to ignore the
+  license page in the installer.
diff --git a/Modules/Internal/CPack/NSIS.template.in b/Modules/Internal/CPack/NSIS.template.in
index 848691f..1df8a58 100644
--- a/Modules/Internal/CPack/NSIS.template.in
+++ b/Modules/Internal/CPack/NSIS.template.in
@@ -540,7 +540,7 @@ FunctionEnd
   @CPACK_NSIS_INSTALLER_WELCOME_TITLE_3LINES_CODE@
   !insertmacro MUI_PAGE_WELCOME
 
-  !insertmacro MUI_PAGE_LICENSE "@CPACK_RESOURCE_FILE_LICENSE@"
+  @CPACK_NSIS_LICENSE_PAGE@
   Page custom InstallOptionsPage
   !insertmacro MUI_PAGE_DIRECTORY
 
diff --git a/Source/CPack/cmCPackNSISGenerator.cxx b/Source/CPack/cmCPackNSISGenerator.cxx
index 6bd0d1b..4a494e1 100644
--- a/Source/CPack/cmCPackNSISGenerator.cxx
+++ b/Source/CPack/cmCPackNSISGenerator.cxx
@@ -235,6 +235,13 @@ int cmCPackNSISGenerator::PackageFiles()
                             brandingTextCode.c_str());
   }
 
+  if (!this->IsSet("CPACK_NSIS_IGNORE_LICENSE_PAGE")) {
+    std::string licenceCode =
+      cmStrCat("!insertmacro MUI_PAGE_LICENSE \"",
+               this->GetOption("CPACK_RESOURCE_FILE_LICENSE"), "\"\n");
+    this->SetOptionIfNotSet("CPACK_NSIS_LICENSE_PAGE", licenceCode.c_str());
+  }
+
   // Setup all of the component sections
   if (this->Components.empty()) {
     this->SetOptionIfNotSet("CPACK_NSIS_INSTALLATION_TYPES", "");
diff --git a/Tests/CPackNSISGenerator/CMakeLists.txt b/Tests/CPackNSISGenerator/CMakeLists.txt
index 64a8ef6..5d6320b 100644
--- a/Tests/CPackNSISGenerator/CMakeLists.txt
+++ b/Tests/CPackNSISGenerator/CMakeLists.txt
@@ -19,5 +19,6 @@ set(CPACK_NSIS_ENABLE_UNINSTALL_BEFORE_INSTALL ON)
 set(CPACK_NSIS_MANIFEST_DPI_AWARE ON)
 set(CPACK_NSIS_BRANDING_TEXT "CMake branding text")
 set(CPACK_NSIS_BRANDING_TEXT_TRIM_POSITION "RIGHT")
+set(CPACK_NSIS_IGNORE_LICENSE_PAGE ON)
 
 include(CPack)
diff --git a/Tests/CPackNSISGenerator/RunCPackVerifyResult.cmake b/Tests/CPackNSISGenerator/RunCPackVerifyResult.cmake
index 8bfcf26..31a2560 100644
--- a/Tests/CPackNSISGenerator/RunCPackVerifyResult.cmake
+++ b/Tests/CPackNSISGenerator/RunCPackVerifyResult.cmake
@@ -60,3 +60,12 @@ if("${output_index}" EQUAL "-1")
 else()
   message(STATUS "Found BrandingText")
 endif()
+
+# license page should not be present
+file(STRINGS "${project_file}" line REGEX "!insertmacro MUI_PAGE_LICENSE")
+string(FIND "${line}" "MUI_PAGE_LICENSE" output_index)
+if("${output_index}" EQUAL "-1")
+  message(STATUS "License not found in the project")
+else()
+  message(FATAL_ERROR "License found in the project")
+endif()
-- 
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