From 309ca67853b35f3f652686dbb52ca5182b81d0a7 Mon Sep 17 00:00:00 2001
From: Thomas White <taw@physics.org>
Date: Fri, 4 Oct 2019 21:34:41 +0200
Subject: Implement which_run()

---
 libstorycode/gtk/gtknarrativeview.c | 16 +++++-----------
 libstorycode/narrative.c            | 17 +++++++++++++++++
 libstorycode/narrative_priv.h       |  4 +---
 3 files changed, 23 insertions(+), 14 deletions(-)

diff --git a/libstorycode/gtk/gtknarrativeview.c b/libstorycode/gtk/gtknarrativeview.c
index b7571f1..e44d25b 100644
--- a/libstorycode/gtk/gtknarrativeview.c
+++ b/libstorycode/gtk/gtknarrativeview.c
@@ -800,22 +800,16 @@ static void insert_text_in_paragraph(struct narrative_item *item, size_t offs,
 {
 	char *n;
 	int run;
-	size_t pos;
+	size_t run_offs;
 
-	pos = 0;
-	for ( run=0; run<item->n_runs; run++ ) {
-		size_t npos = pos + strlen(item->runs[run].text);
-		if ( npos >= offs ) break;
-		pos = npos;
-	}
-	offs -= pos;
+	run = which_run(item, offs, &run_offs);
 
 	n = malloc(strlen(t) + strlen(item->runs[run].text) + 1);
 	if ( n == NULL ) return;
-	strncpy(n, item->runs[run].text, offs);
-	n[offs] = '\0';
+	strncpy(n, item->runs[run].text, run_offs);
+	n[run_offs] = '\0';
 	strcat(n, t);
-	strcat(n, item->runs[run].text+offs);
+	strcat(n, item->runs[run].text+run_offs);
 	free(item->runs[run].text);
 	item->runs[run].text = n;
 }
diff --git a/libstorycode/narrative.c b/libstorycode/narrative.c
index 3bf85f5..08c19d3 100644
--- a/libstorycode/narrative.c
+++ b/libstorycode/narrative.c
@@ -406,6 +406,23 @@ void narrative_delete_block(Narrative *n, int i1, size_t o1, int i2, size_t o2)
 }
 
 
+int which_run(struct narrative_item *item, size_t item_offs, size_t *run_offs)
+{
+	int run;
+	size_t pos = 0;
+
+	for ( run=0; run<item->n_runs; run++ ) {
+		size_t npos = pos + strlen(item->runs[run].text);
+		if ( npos >= item_offs ) break;
+		pos = npos;
+	}
+	if ( run_offs != NULL ) {
+		*run_offs = item_offs - pos;
+	}
+	return run;
+}
+
+
 void narrative_split_item(Narrative *n, int i1, size_t o1)
 {
 	/* FIXME! */
diff --git a/libstorycode/narrative_priv.h b/libstorycode/narrative_priv.h
index 4862455..dcf8831 100644
--- a/libstorycode/narrative_priv.h
+++ b/libstorycode/narrative_priv.h
@@ -97,9 +97,7 @@ struct _narrative
 	double space_b;
 };
 
-extern int text_index_to_layout(struct narrative_item *item, int idx);
-
-extern int layout_index_to_text(struct narrative_item *item, int idx);
+extern int which_run(struct narrative_item *item, size_t item_offs, size_t *run_offs);
 
 
 #endif /* NARRATIVE_PRIV_H */
-- 
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