[discount] Add new package Discount (#7400)

* [discount] Add new package Discount

* [discount] Add new package Discount

* New package [Discount](https://github.com/Orc/discount)

* Static build only

* [discount] Fix arm* and *uwp builds

* Discount needs to run `mktags.exe` to generate `blocktags`. This fix copy generated `blocktags` to `SOURCE_PATH` for arm\* builds and \*uwp builds.

* [discount] Fix UWP and ARM check

* [discount] Another fix for blocktags

* [discount] And another one

* [discount] And another one. Please squash these PR commits.

Sorry I don't have UWP or ARM compiler installed on my machine.

* [discount] Use definitions in msvc/Makefile

* [discount] Add homepage

ports/discount/CONTROL

@@ -0,0 +1,4 @@
+Source: discount
+Version: 2.2.6
+Homepage: https://github.com/Orc/discount
+Description: DISCOUNT is a implementation of John Gruber & Aaron Swartz's Markdown markup language.

ports/discount/blocktags

@@ -0,0 +1,34 @@
+static struct kw blocktags[] = {
+   { "P", 1, 0 },
+   { "DL", 2, 0 },
+   { "H1", 2, 0 },
+   { "H2", 2, 0 },
+   { "H3", 2, 0 },
+   { "H4", 2, 0 },
+   { "H5", 2, 0 },
+   { "H6", 2, 0 },
+   { "HR", 2, 1 },
+   { "OL", 2, 0 },
+   { "UL", 2, 0 },
+   { "BDO", 3, 0 },
+   { "DFN", 3, 0 },
+   { "DIV", 3, 0 },
+   { "MAP", 3, 0 },
+   { "PRE", 3, 0 },
+   { "WBR", 3, 0 },
+   { "XMP", 3, 0 },
+   { "FORM", 4, 0 },
+   { "NOBR", 4, 0 },
+   { "STYLE", 5, 0 },
+   { "TABLE", 5, 0 },
+   { "CENTER", 6, 0 },
+   { "IFRAME", 6, 0 },
+   { "OBJECT", 6, 0 },
+   { "SCRIPT", 6, 0 },
+   { "ADDRESS", 7, 0 },
+   { "LISTING", 7, 0 },
+   { "PLAINTEXT", 9, 0 },
+   { "BLOCKQUOTE", 10, 0 },
+};
+
+#define NR_blocktags 30

ports/discount/cmake.patch

@@ -0,0 +1,27 @@
+diff --git a/cmake/CMakeLists.txt b/cmake/CMakeLists.txt
+index 3895fdb..a183836 100644
+--- a/cmake/CMakeLists.txt
++++ b/cmake/CMakeLists.txt
+@@ -182,7 +182,10 @@ if(${PROJECT_NAME}_MAKE_INSTALL)
+     target_include_directories(libmarkdown INTERFACE
+       $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
+     )
+-    set(_TARGETS libmarkdown markdown)
++    set(_TARGETS libmarkdown)
++    if(NOT ${PROJECT_NAME}_ONLY_LIBRARY)
++        set(_TARGETS ${_TARGETS} markdown)
++    endif()
+     if(${PROJECT_NAME}_INSTALL_SAMPLES)
+         list(APPEND _TARGETS mkd2html makepage)
+     endif()
+diff --git a/cmake/config.h.in b/cmake/config.h.in
+index e08220d..e630934 100644
+--- a/cmake/config.h.in
++++ b/cmake/config.h.in
+@@ -74,4 +74,6 @@
+ 
+ #define TABSTOP @TABSTOP@
+ 
++#define DESTRUCTOR
++
+ #endif /* _CONFIG_D */

ports/discount/disable-deprecated-warnings.patch

@@ -0,0 +1,16 @@
+diff --git a/cmake/CMakeLists.txt b/cmake/CMakeLists.txt
+index 11fa675..34cc9ed 100644
+--- a/cmake/CMakeLists.txt
++++ b/cmake/CMakeLists.txt
+@@ -20,6 +20,11 @@ set(${PROJECT_NAME}_INSTALL_SAMPLES OFF CACHE BOOL
+ set(${PROJECT_NAME}_ONLY_LIBRARY OFF CACHE BOOL
+     "Set to ON to only build markdown library (default is OFF)")
+
++# MSVC deprecated warnings (C4996,strdup, ...)
++if(MSVC)
++    add_definitions(-D_CRT_SECURE_NO_DEPRECATE -D_CRT_NONSTDC_NO_DEPRECATE -D_SCL_SECURE_NO_WARNINGS)
++endif()
++
+ # Check headers
+ include(CheckIncludeFile)
+ check_include_file(libgen.h HAVE_LIBGEN_H)

ports/discount/generate-blocktags-command.patch

@@ -0,0 +1,29 @@
+diff --git a/cmake/CMakeLists.txt b/cmake/CMakeLists.txt
+index a183836..e9deef5 100644
+--- a/cmake/CMakeLists.txt
++++ b/cmake/CMakeLists.txt
+@@ -113,12 +115,19 @@ configure_file("${_ROOT}/mkdio.h.in"
+
+ include_directories("${_ROOT}")
+
+-add_executable(mktags
+-    "${_ROOT}/mktags.c")
+
+-add_custom_command(OUTPUT "${_ROOT}/blocktags"
+-    COMMAND mktags > blocktags
+-    WORKING_DIRECTORY "${_ROOT}")
++if(NOT GENERATE_BLOCKTAGS)
++    message(STATUS "Not generating blocktags")
++else()
++    message(STATUS "Using mktags to generate blocktags")
++
++    add_executable(mktags
++        "${_ROOT}/mktags.c")
++
++    add_custom_command(OUTPUT "${_ROOT}/blocktags"
++        COMMAND mktags > blocktags
++        WORKING_DIRECTORY "${_ROOT}")
++endif()
+
+ add_library(libmarkdown
+     "${_ROOT}/mkdio.c"

ports/discount/portfile.cmake

@@ -0,0 +1,45 @@
+include(vcpkg_common_functions)
+
+# No dynamic link for MSVC
+vcpkg_check_linkage(ONLY_STATIC_LIBRARY)
+
+vcpkg_from_github(
+    OUT_SOURCE_PATH SOURCE_PATH
+    REPO Orc/discount
+    REF v2.2.6
+    SHA512 4c5956dea78aacd3a105ddac13f1671d811a5b2b04990cdf8485c36190c8872c4b1b9432a7236f669c34b07564ecd0096632dced54d67de9eaf4f23641417ecc
+    HEAD_REF master
+    PATCHES
+      cmake.patch
+      generate-blocktags-command.patch
+      disable-deprecated-warnings.patch
+)
+
+set(GENERATE_BLOCKTAGS ON)
+if(VCPKG_TARGET_ARCHITECTURE MATCHES "arm" OR VCPKG_TARGET_ARCHITECTURE MATCHES "arm64" OR VCPKG_CMAKE_SYSTEM_NAME MATCHES "WindowsStore")
+    set(GENERATE_BLOCKTAGS OFF)
+endif()
+
+if(NOT GENERATE_BLOCKTAGS)
+    configure_file("${CURRENT_PORT_DIR}/blocktags" "${SOURCE_PATH}/blocktags" COPYONLY)
+    message(STATUS "Copied blocktags")
+endif()
+
+vcpkg_configure_cmake(
+    SOURCE_PATH "${SOURCE_PATH}/cmake"
+    PREFER_NINJA
+    DISABLE_PARALLEL_CONFIGURE
+    OPTIONS
+        -DDISCOUNT_ONLY_LIBRARY=ON
+        -DGENERATE_BLOCKTAGS=${GENERATE_BLOCKTAGS}
+)
+
+vcpkg_install_cmake()
+vcpkg_fixup_cmake_targets(CONFIG_PATH lib/cmake/discount)
+vcpkg_copy_pdbs()
+
+file(REMOVE_RECURSE "${CURRENT_PACKAGES_DIR}/debug/include")
+
+# Handle copyright
+file(INSTALL "${SOURCE_PATH}/COPYRIGHT" DESTINATION "${CURRENT_PACKAGES_DIR}/share/discount" RENAME copyright)
+