bshell: re-organise build into three separate components

bshell: the front-end binary
bshell.runtime: contains the parser, compiler, and classes needed to run bshell scripts
bshell.core: contains the builtin commandlets and aliases

bshell.runtime/compile/block.c

@@ -0,0 +1,65 @@
+#include "compile-node.h"
+
+#include <bshell/compile.h>
+#include <stdio.h>
+
+static enum bshell_status block_load(
+	struct compile_ctx *ctx,
+	struct compile_value *value)
+{
+	bshell_scriptblock_push_instruction(
+		ctx->c_block,
+		BSHELL_OPCODE_LDBLOCK,
+		value->v_pool);
+	return BSHELL_SUCCESS;
+}
+
+static const struct compile_value_type block_type = {
+	.v_load = block_load,
+};
+
+struct compile_result compile_block(
+	struct compile_ctx *ctx,
+	struct bshell_ast_node *src)
+{
+	bshell_scriptblock *sub_block = bshell_scriptblock_create();
+	if (!sub_block) {
+		return COMPILE_ERR(BSHELL_ERR_NO_MEMORY);
+	}
+
+	enum bshell_status status = bshell_compile(src, sub_block);
+	if (status != BSHELL_SUCCESS) {
+		bshell_scriptblock_unref(sub_block);
+		return COMPILE_ERR(status);
+	}
+
+	fx_value sub_block_value = FX_VALUE_OBJECT(sub_block);
+	unsigned long slot = bshell_scriptblock_add_pool_value(
+		ctx->c_block,
+		&sub_block_value);
+	fx_value_unset(&sub_block_value);
+	compile_push_pool_value(ctx, &block_type, slot);
+
+	return COMPILE_OK(0);
+}
+
+enum bshell_status compile_block_immediate(
+	struct compile_ctx *ctx,
+	struct bshell_ast_node *src)
+{
+	enum bshell_status status = BSHELL_SUCCESS;
+	struct bshell_block_ast_node *block = (struct bshell_block_ast_node *)
+		src;
+
+	fx_queue_entry *cur = fx_queue_first(&block->n_statements);
+	while (cur && status == BSHELL_SUCCESS) {
+		struct bshell_ast_node *node = fx_unbox(
+			struct bshell_ast_node,
+			cur,
+			n_entry);
+		status = compile_node(ctx, node);
+		cur = fx_queue_next(cur);
+	}
+
+	return status;
+}