Make docoptcpp use boost.regex on Windows

std::regex is kind of broken on Windows[1].

[1] https://github.com/docopt/docopt.cpp/issues/49

kiwixbuild/dependencies/__init__.py

@@ -1,6 +1,7 @@
 from .base import *
 from . import (
     all_dependencies,
+    boostregex,
     tc_android_ndk,
     aria2,
     tc_armhf,

kiwixbuild/dependencies/all_dependencies.py

@@ -23,6 +23,8 @@ class AllBaseDependencies(Dependency):
                     "xapian-core",
                     "zim-testing-suite",
                     "icu4c",
+                    "boostregex",
+                    "docoptcpp"
                 ]
 
                 if not configInfo.name.endswith("_dyn"):

kiwixbuild/dependencies/boostregex.py

@@ -0,0 +1,27 @@
+from .base import Dependency, ReleaseDownload, Builder as BaseBuilder
+
+from kiwixbuild.utils import Remotefile, pj
+from shutil import copytree
+
+
+class BoostRegex(Dependency):
+    name = "boostregex"
+
+    class Source(ReleaseDownload):
+        archive = Remotefile(
+            "regex-boost-1.86.0.zip",
+            "",
+            "https://codeload.github.com/boostorg/regex/zip/refs/tags/boost-1.86.0",
+        )
+
+    class Builder(BaseBuilder):
+        def build(self):
+            self.command("copy_headers", self._copy_headers)
+
+        def _copy_headers(self, context):
+            context.try_skip(self.build_path)
+            copytree(
+                pj(self.source_path, "include", "boost"),
+                pj(self.buildEnv.install_dir, "include", "boost"),
+                dirs_exist_ok=True,
+            )

kiwixbuild/dependencies/docoptcpp.py

@@ -1,7 +1,7 @@
 from .base import Dependency, ReleaseDownload, MesonBuilder
 
 from kiwixbuild.utils import Remotefile
-
+from kiwixbuild._global import neutralEnv
 
 class docoptcpp(Dependency):
     name = "docoptcpp"
@@ -21,6 +21,14 @@ class docoptcpp(Dependency):
         )
 
         archives = [src_archive, meson_archive]
-        patches = ["docopt_meson_install_pkgconfig.patch"]
+        patches = [
+            "docopt_meson_install_pkgconfig.patch",
+            "docopt_meson_use_boostregex.patch",
+        ]
 
-    Builder = MesonBuilder
+    class Builder(MesonBuilder):
+        @classmethod
+        def get_dependencies(cls, configInfo, allDeps):
+            if neutralEnv("distname") == "Windows":
+                return ["boostregex"]
+            return []

kiwixbuild/patches/docopt_meson_use_boostregex.patch

@@ -0,0 +1,14 @@
+diff -ur docoptcpp-0.6.2/meson.build docoptcpp-0.6.2_boostregex/meson.build
+--- docoptcpp-0.6.2/meson.build	2024-08-28 17:22:46.256716100 +0200
++++ docoptcpp-0.6.2_boostregex/meson.build	2024-08-28 17:02:47.932681000 +0200
+@@ -8,6 +8,10 @@
+   add_project_arguments('-DDOCOPT_DLL', '-DDOCOPT_EXPORTS', language: 'cpp')
+ endif
+ 
++if cpp.get_id() =='msvc'
++  add_project_arguments('-DDOCTOPT_USE_BOOST_REGEX', '-DBOOST_REGEX_STANDALONE', language: 'cpp')
++endif
++
+ # bug with missing dllexport. fixed in next version.
+ if cpp.get_argument_syntax() == 'msvc'
+   doclib = static_library('docopt', 'docopt.cpp', install: true)