From 44f874ed89b364bc0b60b35572f64fae44154733 Mon Sep 17 00:00:00 2001
From: Thomas White <taw@bitwiz.me.uk>
Date: Sun, 10 Mar 2019 22:23:21 +0100
Subject: Implement enter press / paragraph split

---
 libstorycode/gtk/gtknarrativeview.c   | 30 +++++++++++++++++++-----
 libstorycode/narrative.c              | 43 +++++++++++++++++++++++++++++++----
 libstorycode/narrative.h              |  1 +
 libstorycode/narrative_render_cairo.c |  2 ++
 4 files changed, 66 insertions(+), 10 deletions(-)

diff --git a/libstorycode/gtk/gtknarrativeview.c b/libstorycode/gtk/gtknarrativeview.c
index da3d049..ec34778 100644
--- a/libstorycode/gtk/gtknarrativeview.c
+++ b/libstorycode/gtk/gtknarrativeview.c
@@ -528,6 +528,11 @@ static void get_cursor_pos(Narrative *n, struct edit_pos cpos,
 		return;
 	}
 
+	if ( item->layout == NULL ) {
+		fprintf(stderr, "get_cursor_pos: No layout\n");
+		return;
+	}
+
 	offs = pos_trail_to_offset(item, cpos.pos, cpos.trail);
 	pango_layout_get_cursor_pos(item->layout, offs, &rect, NULL);
 	*x = pango_units_to_double(rect.x) + n->space_l + item->space_l;
@@ -680,6 +685,7 @@ static void cursor_moveh(Narrative *n, struct edit_pos *cp, signed int dir)
 			cp->trail = 0;
 		}
 	} else {
+		if ( item->layout == NULL ) return;
 		pango_layout_move_cursor_visually(item->layout, 1, cp->pos,
 		                                  cp->trail, dir,
 		                                  &np, &cp->trail);
@@ -804,6 +810,21 @@ static void insert_text_in_paragraph(struct narrative_item *item, size_t offs,
 }
 
 
+static void split_paragraph_at_cursor(Narrative *n, struct edit_pos pos)
+{
+	size_t off;
+
+	if ( n->items[pos.para].type != NARRATIVE_ITEM_SLIDE ) {
+		off = pos_trail_to_offset(&n->items[pos.para],
+		                          pos.pos, pos.trail);
+	} else {
+		off = 0;
+	}
+
+	narrative_split_item(n, pos.para, off);
+}
+
+
 static void insert_text(char *t, GtkNarrativeView *e)
 {
 	Narrative *n;
@@ -816,7 +837,8 @@ static void insert_text(char *t, GtkNarrativeView *e)
 	item = get_current_item(e, &n);
 
 	if ( strcmp(t, "\n") == 0 ) {
-		//split_paragraph_at_cursor(e); FIXME
+		split_paragraph_at_cursor(n, e->cpos);
+		rewrap_range(e, e->cpos.para, e->cpos.para+1);
 		update_size(e);
 		cursor_moveh(n, &e->cpos, +1);
 		check_cursor_visible(e);
@@ -835,11 +857,7 @@ static void insert_text(char *t, GtkNarrativeView *e)
 		update_size(e);
 		cursor_moveh(n, &e->cpos, +1);
 
-	} else {
-
-		/* FIXME: Add text after slide */
-
-	}
+	} /* else do nothing: pressing enter is OK, though */
 
 	emit_change_sig(e);
 	check_cursor_visible(e);
diff --git a/libstorycode/narrative.c b/libstorycode/narrative.c
index caf9bc9..81b55f0 100644
--- a/libstorycode/narrative.c
+++ b/libstorycode/narrative.c
@@ -70,6 +70,15 @@ void narrative_free(Narrative *n)
 }
 
 
+static void init_item(struct narrative_item *item)
+{
+	item->layout = NULL;
+	item->text = NULL;
+	item->slide = NULL;
+	item->slide_thumbnail = NULL;
+}
+
+
 static struct narrative_item *add_item(Narrative *n)
 {
 	struct narrative_item *new_items;
@@ -78,14 +87,21 @@ static struct narrative_item *add_item(Narrative *n)
 	if ( new_items == NULL ) return NULL;
 	n->items = new_items;
 	item = &n->items[n->n_items++];
-	item->layout = NULL;
-	item->text = NULL;
-	item->slide = NULL;
-	item->slide_thumbnail = NULL;
+	init_item(item);
 	return item;
 }
 
 
+static struct narrative_item *insert_item(Narrative *n, int pos)
+{
+	add_item(n);
+	memmove(&n->items[pos+1], &n->items[pos],
+	        (n->n_items-pos-1)*sizeof(struct narrative_item));
+	init_item(&n->items[pos+1]);
+	return &n->items[pos+1];
+}
+
+
 void narrative_add_prestitle(Narrative *n, char *text)
 {
 	struct narrative_item *item;
@@ -213,3 +229,22 @@ void narrative_delete_block(Narrative *n, int i1, size_t o1, int i2, size_t o2)
 		delete_item(n, i2);
 	}
 }
+
+
+void narrative_split_item(Narrative *n, int i1, size_t o1)
+{
+	struct narrative_item *item1;
+	struct narrative_item *item2;
+
+	item1 = &n->items[i1];
+	item2 = insert_item(n, i1);
+
+	if ( item1->type != NARRATIVE_ITEM_SLIDE ) {
+		item2->text = strdup(&item1->text[o1]);
+		item1->text[o1] = '\0';
+	} else {
+		item2->text = strdup("");
+	}
+
+	item2->type = NARRATIVE_ITEM_TEXT;
+}
diff --git a/libstorycode/narrative.h b/libstorycode/narrative.h
index 412bc6b..5b8af4a 100644
--- a/libstorycode/narrative.h
+++ b/libstorycode/narrative.h
@@ -40,6 +40,7 @@ extern void narrative_add_text(Narrative *n, char *text);
 extern void narrative_add_slide(Narrative *n, Slide *slide);
 extern void narrative_delete_block(Narrative *n, int i1, size_t o1,
                                                  int i2, size_t o2);
+extern void narrative_split_item(Narrative *n, int i1, size_t o1);
 
 
 #endif /* NARRATIVE_H */
diff --git a/libstorycode/narrative_render_cairo.c b/libstorycode/narrative_render_cairo.c
index 9852db8..b4f29cb 100644
--- a/libstorycode/narrative_render_cairo.c
+++ b/libstorycode/narrative_render_cairo.c
@@ -369,6 +369,8 @@ static void draw_slide(struct narrative_item *item, cairo_t *cr)
 
 static void draw_text(struct narrative_item *item, cairo_t *cr)
 {
+	if ( item->layout == NULL ) return;
+
 	cairo_save(cr);
 	cairo_translate(cr, item->space_l, item->space_t);
 
-- 
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