Add build time math rendering

While very useful on its own (and combined with the passthrough render hooks), this also serves as a proof of concept of using WASI (WebAssembly System Interface) modules in Hugo.

This will be marked _experimental_ in the documentation. Not because it will be removed or changed in a dramatic way, but we need to think a little more how to best set up/configure similar services, define where these WASM files gets stored, maybe we can allow user provided WASM files plugins via Hugo Modules mounts etc.

See these issues for more context:

* https://github.com/gohugoio/hugo/issues/12736
* https://github.com/gohugoio/hugo/issues/12737

See #11927

2 files changed, 14 insertions, 4 deletions

diff --git a/cache/filecache/filecache_config.go b/cache/filecache/filecache_config.go
index 6a2b5f3e3..a71ddb474 100644
--- a/cache/filecache/filecache_config.go
+++ b/cache/filecache/filecache_config.go
@@ -46,6 +46,7 @@ const (
 	CacheKeyAssets      = "assets"
 	CacheKeyModules     = "modules"
 	CacheKeyGetResource = "getresource"
+	CacheKeyMisc        = "misc"
 )
 
 type Configs map[string]FileCacheConfig
@@ -70,10 +71,14 @@ var defaultCacheConfigs = Configs{
 		MaxAge: -1,
 		Dir:    resourcesGenDir,
 	},
-	CacheKeyGetResource: FileCacheConfig{
+	CacheKeyGetResource: {
 		MaxAge: -1, // Never expire
 		Dir:    cacheDirProject,
 	},
+	CacheKeyMisc: {
+		MaxAge: -1,
+		Dir:    cacheDirProject,
+	},
 }
 
 type FileCacheConfig struct {
@@ -120,6 +125,11 @@ func (f Caches) AssetsCache() *Cache {
 	return f[CacheKeyAssets]
 }
 
+// MiscCache gets the file cache for miscellaneous stuff.
+func (f Caches) MiscCache() *Cache {
+	return f[CacheKeyMisc]
+}
+
 // GetResourceCache gets the file cache for remote resources.
 func (f Caches) GetResourceCache() *Cache {
 	return f[CacheKeyGetResource]
diff --git a/cache/filecache/filecache_config_test.go b/cache/filecache/filecache_config_test.go
index f93c7060e..c6d346dfc 100644
--- a/cache/filecache/filecache_config_test.go
+++ b/cache/filecache/filecache_config_test.go
@@ -59,7 +59,7 @@ dir = "/path/to/c4"
 	c.Assert(err, qt.IsNil)
 	fs := afero.NewMemMapFs()
 	decoded := testconfig.GetTestConfigs(fs, cfg).Base.Caches
-	c.Assert(len(decoded), qt.Equals, 6)
+	c.Assert(len(decoded), qt.Equals, 7)
 
 	c2 := decoded["getcsv"]
 	c.Assert(c2.MaxAge.String(), qt.Equals, "11h0m0s")
@@ -106,7 +106,7 @@ dir = "/path/to/c4"
 	c.Assert(err, qt.IsNil)
 	fs := afero.NewMemMapFs()
 	decoded := testconfig.GetTestConfigs(fs, cfg).Base.Caches
-	c.Assert(len(decoded), qt.Equals, 6)
+	c.Assert(len(decoded), qt.Equals, 7)
 
 	for _, v := range decoded {
 		c.Assert(v.MaxAge, qt.Equals, time.Duration(0))
@@ -129,7 +129,7 @@ func TestDecodeConfigDefault(t *testing.T) {
 
 	fs := afero.NewMemMapFs()
 	decoded := testconfig.GetTestConfigs(fs, cfg).Base.Caches
-	c.Assert(len(decoded), qt.Equals, 6)
+	c.Assert(len(decoded), qt.Equals, 7)
 
 	imgConfig := decoded[filecache.CacheKeyImages]
 	jsonConfig := decoded[filecache.CacheKeyGetJSON]