Update the expectations on grammars

Outside the Nix setup, it will be the responsibility of something else
(might be a script) to provide the treesitter grammars.

3 files changed, 24 insertions, 6 deletions

diff --git a/Makefile b/Makefile
index a4cec94..5630d10 100644
--- a/Makefile
+++ b/Makefile
@@ -121,12 +121,11 @@ FILES = $(DEPS) \
 	$(CC) $(CFLAGS) -c $< -o $@
 
 grammars:
-	@if [ -n "$$TREESITTER_GRAMMARS" ]; then \
-		IFS=":"; for p in "$$TREESITTER_GRAMMARS"; do \
+	@if [ "$(SYNTAX_ENABLE)" = "true" ] && [ -n "$$BUNDLE_TREESITTER_GRAMMARS" ]; then \
+		IFS=":"; for p in "$$BUNDLE_TREESITTER_GRAMMARS"; do \
 			cp -rL --no-preserve=mode "$$p"/ grammars; \
 		done \
 	else \
-		echo "TODO: download and build default set of grammars"; \
 		mkdir -p ./grammars; \
 	fi
 
diff --git a/README.md b/README.md
index 5b44750..c32d60f 100644
--- a/README.md
+++ b/README.md
@@ -21,7 +21,7 @@ expected pre-1.0.0.
 - [x] Terminal only
 - [x] Mouse-free editing
 - [x] Naive and incorrect unicode handling
-- [ ] LSP Client implementation
+- [ ] LSP Client implementation (in progress)
 
 ## Contributing
 
@@ -41,7 +41,25 @@ needed dependencies, issue:
 $ nix develop
 ```
 
-Currently, tree-sitter grammars can only be automatically fetched when using the Nix setup.
+Tree-sitter grammars are automatically fetched and bundled when using the Nix setup.
+When not using the Nix setup, download/build needed treesitter grammars and set the env
+var $BUNDLE_TREESITTER_GRAMMARS to a folder containing built treesitter grammars. The
+structure should be like
+
+```
+/
+  <lang-1>/
+            parser # the parser binary as a DSO
+            queries/
+                highlights.scm # treesitter queries for highlights
+  <lang-2>/
+           parser
+           queries/
+                highlights.scm
+  ...
+```
+
+where `<lang-1>` is for example `cpp` which corresponds to the language id, see man page.
 
 To build the editor, first create the build folder
 
diff --git a/dged.nix b/dged.nix
index 6f68df9..6bd4e43 100644
--- a/dged.nix
+++ b/dged.nix
@@ -37,7 +37,8 @@ stdenv.mkDerivation {
   # needed for tests to work in sandboxed builds
   LOCALE_ARCHIVE = "${glibcLocalesUtf8}/lib/locale/locale-archive";
 
-  TREESITTER_GRAMMARS = with tree-sitter-grammars;
+  TREESITTER_GRAMMARS = "./build/grammars";
+  BUNDLE_TREESITTER_GRAMMARS = with tree-sitter-grammars;
     linkFarm "tree-sitter-grammars" rec {
       "bash" = tree-sitter-bash;
       "c" = tree-sitter-c;