Use LocalAppData for thumbnails on Windows

We're very early adopters of msitools' new UI feature,
so this doesn't work on MSYS2 directly yet due to an old version.

README.adoc

@@ -65,14 +65,15 @@ Windows
 ~~~~~~~
 'fiv' can be cross-compiled for Windows, provided that you install a bunch of
 dependencies listed at the beginning of 'msys2-configure.sh',
-plus rsvg-convert from librsvg2, and icotool from icoutils.
+plus rsvg-convert from librsvg2, icotool from icoutils, and msitools ≥ 0.102.
 Beware that the build will take up about a gigabyte of disk space.
 
  $ sh -e msys2-configure.sh builddir
  $ meson install -C builddir
 
 If everything succeeds, you will find a portable build of the application
-in the 'builddir/package' subdirectory.  No installer is provided yet.
+in the 'builddir/package' subdirectory, and a very basic MSI installation
+package in 'builddir'.
 
 Faster colour management
 ^^^^^^^^^^^^^^^^^^^^^^^^

fiv-thumbnail.c

@@ -100,7 +100,16 @@ mark_thumbnail_lq(cairo_surface_t *surface)
 static gchar *
 fiv_thumbnail_get_root(void)
 {
+#ifdef G_OS_WIN32
+	// We can do better than GLib with FOLDERID_InternetCache,
+	// and we don't want to place .cache directly in the user's home.
+	// TODO(p): Register this thumbnail path using the installer:
+	// https://learn.microsoft.com/en-us/windows/win32/lwef/disk-cleanup
+	gchar *cache_dir =
+		g_build_filename(g_get_user_data_dir(), PROJECT_NAME, NULL);
+#else
 	gchar *cache_dir = get_xdg_home_dir("XDG_CACHE_HOME", ".cache");
+#endif
 	gchar *thumbnails_dir = g_build_filename(cache_dir, "thumbnails", NULL);
 	g_free(cache_dir);
 	return thumbnails_dir;

fiv.wxs.in

@@ -0,0 +1,69 @@
+<?xml version='1.0' encoding='utf-8'?>
+<Wix xmlns='http://schemas.microsoft.com/wix/2006/wi'>
+	<?define FullName = "@ProjectName@ @ProjectVersion@" ?>
+	<?if $(sys.BUILDARCH) = x64 ?>
+		<?define ProgramFilesFolder = "ProgramFiles64Folder" ?>
+	<?else?>
+		<?define ProgramFilesFolder = "ProgramFilesFolder" ?>
+	<?endif?>
+
+	<Product Id='*'
+		Name='$(var.FullName)'
+		UpgradeCode='a3e64e2d-4310-4c5f-8562-bb0e0b3e0a53'
+		Language='1033'
+		Codepage='1252'
+		Version='@ProjectVersion@'
+		Manufacturer='Premysl Eric Janouch'>
+
+		<Package Id='*'
+			Keywords='Installer,Image,Viewer'
+			Description='$(var.FullName) Installer'
+			Manufacturer='Premysl Eric Janouch'
+			InstallerVersion='200'
+			Compressed='yes'
+			Languages='1033'
+			SummaryCodepage='1252' />
+
+		<Media Id='1' Cabinet='data.cab' EmbedCab='yes' />
+		<Icon Id='fiv.ico' SourceFile='fiv.ico' />
+		<Property Id='ARPPRODUCTICON' Value='fiv.ico' />
+		<Property Id='ARPURLINFOABOUT' Value='https://git.janouch.name/p/fiv' />
+
+		<UIRef Id='WixUI_Minimal' />
+		<!-- This isn't supported by msitools, but is necessary for WiX.
+		<WixVariable Id='WixUILicenseRtf' Value='License.rtf' />
+		-->
+
+		<Directory Id='TARGETDIR' Name='SourceDir'>
+			<Directory Id='$(var.ProgramFilesFolder)' Name='Files'>
+				<Directory Id='INSTALLDIR' Name='$(var.FullName)' />
+			</Directory>
+
+			<Directory Id='ProgramMenuFolder' Name='Programs'>
+				<Directory Id='ProgramMenuDir' Name='$(var.FullName)'>
+					<Component Id='ProgramMenuDir' Guid='*'>
+						<Shortcut Id='ProgramsMenuShortcut'
+							Name='@ProjectName@'
+							Target='[INSTALLDIR]\fiv.exe'
+							WorkingDirectory='INSTALLDIR'
+							Arguments='"%USERPROFILE%"'
+							Icon='fiv.ico' />
+						<RemoveFolder Id='ProgramMenuDir' On='uninstall' />
+						<RegistryValue Root='HKCU'
+							Key='Software\[Manufacturer]\[ProductName]'
+							Type='string'
+							Value=''
+							KeyPath='yes' />
+					</Component>
+				</Directory>
+			</Directory>
+
+			<Directory Id='DesktopFolder' Name='Desktop' />
+		</Directory>
+
+		<Feature Id='Complete' Level='1'>
+			<ComponentGroupRef Id='CG.fiv' />
+			<ComponentRef Id='ProgramMenuDir' />
+		</Feature>
+	</Product>
+</Wix>

meson.build

@@ -338,6 +338,19 @@ elif meson.is_cross_build()
 	msys2_root = meson.get_external_property('msys2_root')
 	meson.add_install_script('msys2-install.sh', msys2_root)
 
+	# TODO: If we used DESTDIR instead of the prefix, this could probably
+	# be a custom target that invokes "meson install --destdir $(pwd)/package"
+	# through "meson compile -C builddir msi". Try it out, also in MSYS2.
+	meson.add_install_script('msys2-package.sh', host_machine.cpu())
+	configure_file(
+		input : 'fiv.wxs.in',
+		output : 'fiv.wxs',
+		configuration : configuration_data({
+			'ProjectName' : meson.project_name(),
+			'ProjectVersion' : meson.project_version(),
+		}),
+	)
+
 	# This is the minimum to run targets from msys2-configure.sh builds.
 	meson.add_devenv({
 		'WINEPATH' : msys2_root / 'bin',

msys2-configure.sh

@@ -19,7 +19,7 @@ then
 	wine64() { "$@"; }
 	awk() { command awk -v RS='\r?\n' "$@"; }
 	pacman -S --needed libarchive $pkg-ca-certificates $pkg-gcc $pkg-icoutils \
-		$pkg-librsvg $pkg-meson $pkg-pkgconf
+		$pkg-librsvg $pkg-meson $pkg-msitools $pkg-pkgconf
 fi
 
 status() {

msys2-package.sh

@@ -0,0 +1,30 @@
+#!/bin/sh -e
+export LC_ALL=C.UTF-8
+cd "$MESON_BUILD_ROOT"
+
+txt2rtf() {
+	iconv -f utf-8 -t ascii//translit "$@" | awk 'BEGIN {
+		print "{\\rtf1\\ansi\\ansicpg1252\\deff0{\\fonttbl{\\f0 Tahoma;}}"
+		print "\\f0\\fs24{\\pard\\sa240"
+	} {
+		gsub(/\\/, "\\\\"); gsub(/{/, "\\{"); gsub(/}/, "\\}")
+		if (!$0) { print "\\par}{\\pard\\sa240"; prefix = "" }
+		else { print prefix $0; prefix = " " }
+	} END {
+		print "\\par}}"
+	}'
+}
+
+# We're being passed host_machine.cpu(), which will be either x86 or x86_64.
+[ "$1" = "x86" ] && arch=x86 || arch=x64
+
+wxs=fiv.wxs files=fiv-files.wxs msi=fiv.msi
+
+txt2rtf "$MESON_SOURCE_ROOT/LICENSE" > License.rtf
+find "$MESON_INSTALL_DESTDIR_PREFIX" -type f \
+	| wixl-heat --prefix "$MESON_INSTALL_DESTDIR_PREFIX/" \
+		--directory-ref INSTALLDIR --component-group CG.fiv \
+		--var var.SourceDir > "$files"
+
+wixl --verbose --arch "$arch" -D SourceDir="$MESON_INSTALL_DESTDIR_PREFIX" \
+	--ext ui --output "$msi" "$wxs" "$files"