From 8c5de8279774f8acac0d0143927d3d8992aecdea Mon Sep 17 00:00:00 2001
From: Adrian Thurston <thurston@complang.org>
Date: Sun, 21 Jun 2015 18:00:42 -0400
Subject: testing some indentation-normalization code

Want to be able to reformat indentation during code generation. This first bit
of code will just flatten. Need to add indentation level tracking.
---
 src/input.h |  2 ++
 src/tree.c  | 37 +++++++++++++++++++++++++++++++++++++
 2 files changed, 39 insertions(+)

diff --git a/src/input.h b/src/input.h
index 25a1825f..9811c21e 100644
--- a/src/input.h
+++ b/src/input.h
@@ -143,6 +143,8 @@ struct stream_impl
 	struct ConsItem *cons_item;
 
 	int consumed;
+
+	int indent;
 };
 
 struct stream_impl *colm_impl_new_pat( const char *name, struct Pattern *pattern );
diff --git a/src/tree.c b/src/tree.c
index 40393599..3155428b 100644
--- a/src/tree.c
+++ b/src/tree.c
@@ -1697,6 +1697,43 @@ void append_file( struct colm_print_args *args, const char *data, int length )
 	fwrite( data, 1, length, impl->file );
 }
 
+void append_file_indent( struct colm_print_args *args, const char *data, int length )
+{
+	struct stream_impl *impl = (struct stream_impl*) args->arg;
+restart:
+	if ( impl->indent ) {
+		/* Consume. */
+		while ( length > 0 && ( *data == ' ' || *data == '\t' ) ) {
+			data += 1;
+			length -= 1;
+		}
+
+		if ( length > 0 ) {
+			impl->indent = 0;
+			goto restart;
+		}
+	}
+	else {
+		char *nl = memchr( data, '\n', length );
+		if ( nl ) {
+			int wl = nl - data + 1;
+			fwrite( data, 1, wl, impl->file );
+			/* print indentation. */
+
+
+			/* go into consume state. */
+			data += wl;
+			length -= wl;
+			impl->indent = 1;
+			goto restart;
+		}
+		else {
+			fwrite( data, 1, length, impl->file );
+		}
+	}
+}
+
+
 tree_t *tree_trim( struct colm_program *prg, tree_t **sp, tree_t *tree )
 {
 	debug( prg, REALM_PARSE, "attaching left ignore\n" );
-- 
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