From 015464b1e021cc6c0f3669f31f6b60306d7d3bbe Mon Sep 17 00:00:00 2001
From: Izuru Yakumo <yakumo.izuru@chaotic.ninja>
Date: Wed, 3 Apr 2024 20:17:16 -0300
Subject: [PATCH] Add support for disabling features at build time

Signed-off-by: Izuru Yakumo <yakumo.izuru@chaotic.ninja>
---
 Makefile              |  1 -
 README.md             |  8 ++++++--
 cmd/aya/amber.go      |  1 +
 cmd/aya/amber_stub.go | 11 +++++++++++
 cmd/aya/gcss.go       |  1 +
 cmd/aya/gcss_stub.go  | 11 +++++++++++
 6 files changed, 30 insertions(+), 3 deletions(-)
 create mode 100644 cmd/aya/amber_stub.go
 create mode 100644 cmd/aya/gcss_stub.go

diff --git a/Makefile b/Makefile
index 9fdf9a7..aa7572c 100644
--- a/Makefile
+++ b/Makefile
@@ -4,7 +4,6 @@ PREFIX ?= /usr/local
 DATE ?= `date -u +%F`
 GOOS ?= `go env GOOS`
 VERSION ?= `git describe --tags`
-
 build:
 	go build ${GOFLAGS} ./cmd/aya
 clean:
diff --git a/README.md b/README.md
index a126c81..c260806 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,7 @@ Named after [Aya Shameimaru](https://en.touhouwiki.net/wiki/Aya_Shameimaru) from
 
 ## Installation
 
-Build it manually assuming you have Go (>=1.17) installed:
+Build it manually provided you have Go (>=1.17) installed:
 
 	$ go install marisa.chaotic.ninja/aya/cmd/aya@latest (1)
 	--- or ---
@@ -27,6 +27,10 @@ Build it manually assuming you have Go (>=1.17) installed:
 (1) If you use this method, the `aya version` subcommand may print the wrong string,
 but it should not be a problem unless you use it on a page.
 
+You can also disable certain features at build time, with the `-tags` switch.
+Currently, these tags are available: `noamber`, `nogcss`.
+See `go help buildconstraint` for more details.
+
 ## Ideology
 
 Keep your texts in markdown, [amber](https://github.com/eknkc/amber), or html format right in the main directory
@@ -35,7 +39,7 @@ of your blog/site.
 Keep all service files (extensions, layout pages, deployment scripts etc)
 in the `.aya` subdirectory.
 
-Define variables in the header of the content files using [YAML](https://www.yaml.io) :
+Define variables in the header of the content files using [YAML](https://noyaml.com) :
 
 ```markdown
 title: My web site
diff --git a/cmd/aya/amber.go b/cmd/aya/amber.go
index 05f9fe1..3645282 100644
--- a/cmd/aya/amber.go
+++ b/cmd/aya/amber.go
@@ -1,3 +1,4 @@
+//go:build !noamber
 // Render .amber files into .html
 package main
 
diff --git a/cmd/aya/amber_stub.go b/cmd/aya/amber_stub.go
new file mode 100644
index 0000000..3ed3a9c
--- /dev/null
+++ b/cmd/aya/amber_stub.go
@@ -0,0 +1,11 @@
+//go:build noamber
+package main
+
+import (
+	"errors"
+	"io"
+)
+
+func buildAmber(path string, w io.Writer, vars Vars) error {
+	return errors.New("Amber support was disabled on build-time")
+}
diff --git a/cmd/aya/gcss.go b/cmd/aya/gcss.go
index 2cb449b..c463f57 100644
--- a/cmd/aya/gcss.go
+++ b/cmd/aya/gcss.go
@@ -1,3 +1,4 @@
+//go:build !nogcss
 // Render .gcss files into .css
 package main
 
diff --git a/cmd/aya/gcss_stub.go b/cmd/aya/gcss_stub.go
new file mode 100644
index 0000000..cb1f8c0
--- /dev/null
+++ b/cmd/aya/gcss_stub.go
@@ -0,0 +1,11 @@
+//go:build nogcss
+package main
+
+import (
+	"errors"
+	"io"
+)
+
+func buildGCSS(path string, w io.Writer) error {
+	return errors.New("GCSS support was disabled at build time")
+}
-- 
2.43.0