Improve configure with docs and help flag

Also make targets dependent on config.mk so that the program
is rebuilt when config.mk changes.

3 files changed, 69 insertions, 5 deletions

diff --git a/Makefile b/Makefile
index 7d84085..942cbad 100644
--- a/Makefile
+++ b/Makefile
@@ -4,7 +4,6 @@ default: dged
 
 .PHONY: default clean check run debug debug-tests install format
 .OBJDIR: ./build
-SYNTAX_ENABLE ?= true
 
 build:
 	mkdir -p build
@@ -14,6 +13,7 @@ build:
 .endif
 
 .include "config.mk"
+SYNTAX_ENABLE ?= true
 
 HEADERS = src/dged/settings.h src/dged/minibuffer.h src/dged/keyboard.h src/dged/binding.h \
 	src/dged/buffers.h src/dged/text.h src/dged/display.h src/dged/hashmap.h src/dged/path.h \
@@ -97,12 +97,12 @@ FILES = $(DEPS) \
 		libdged.a
 
 # dependency generation
-.c.d:
+.c.d: config.mk
 	@mkdir -p $(@D)
 	$(CC) -MM $(CFLAGS) -MT $*.o $< > $@
 	@sed -i 's,\($*\)\.o[ :]*,\1.o $@ : ,g' $@
 
-.c.o:
+.c.o: config.mk
 	@mkdir -p $(@D)
 	$(CC) $(CFLAGS) -c $< -o $@
 
diff --git a/README.md b/README.md
index 0f5a48e..5b44750 100644
--- a/README.md
+++ b/README.md
@@ -29,7 +29,7 @@ Contributions are of course welcome. Please open a PR on the Github repository.
 
 ## Development Setup
 
-The editor is built using BSD make (specifically bmake) so that needs to be installed.
+The editor is built using BSD make so that needs to be installed (preinstalled on BSD and bmake on Linux).
 
 To enable syntax highlighting (default) you will also need the tree-sitter library
 installed.
@@ -55,7 +55,13 @@ or
 $ mkdir -p obj
 ```
 
-Then call make
+Then call configure (see available options by passing `--help` to `./configure`)
+
+```
+$ ./configure
+```
+
+followed by (you guessed it!) make
 
 ```
 $ bmake
diff --git a/configure b/configure
index 8cce0d0..63aa2f8 100755
--- a/configure
+++ b/configure
@@ -1,5 +1,49 @@
 #!/bin/sh
 
+_usage="./configure -- configure the DGED build.
+
+Options:
+  --[enable|disable]-syntax    Enable or disable syntax highlighting support.
+  --enable-asan                Build DGED with address sanitizer enabled.
+  -h/--help                    Show this help text.
+"
+
+enable_syntax=1
+enable_asan=0
+while [ "$#" -gt 0 ]; do
+    case $1 in
+         --disable-syntax)
+            enable_syntax=0
+            shift 1
+            ;;
+
+        --enable-syntax)
+            enable_syntax=1
+            shift 1
+            ;;
+
+        --enable-asan)
+            enable_asan=1
+            shift 1
+            ;;
+
+        -h|--help)
+            echo "$_usage"
+            exit
+            ;;
+
+        -*)
+            echo "Unknown flag \"$1\". Usage:"
+            echo "$_usage"
+            exit 1
+            ;;
+        *)
+            shift 1
+            ;;
+    esac
+done
+
+
 echo "/* Generated by configure */" > src/config.h
 echo "#ifndef _CONFIG_H" >> src/config.h
 echo "#define _CONFIG_H" >> src/config.h
@@ -19,6 +63,20 @@ else
     echo "none."
 fi
 
+if [ "$enable_syntax" -ne 0 ]; then
+    echo "enabling syntax highlighting"
+    echo "SYNTAX_ENABLE = true" >> config.mk
+else
+    echo "disabling syntax highlighting"
+    echo "SYNTAX_ENABLE = false" >> config.mk
+fi
+
+if [ "$enable_asan" -ne 0 ]; then
+    echo "enabling address sanitizer"
+    echo "ASAN = true" >> config.mk
+fi
+
+
 echo "#endif" >> src/config.h
 echo "wrote src/config.h"
 echo "wrote config.mk"