From bf89dce60e148cd7eb12c17984417a18496661da Mon Sep 17 00:00:00 2001
From: Thomas White <taw@bitwiz.me.uk>
Date: Fri, 22 Mar 2019 00:42:04 +0100
Subject: Implement slide text paragraph splitting

---
 libstorycode/gtk/gtkslideview.c | 15 ++++++++-------
 libstorycode/slide.c            | 34 ++++++++++++++++++++++++++++++++++
 libstorycode/slide.h            |  2 ++
 3 files changed, 44 insertions(+), 7 deletions(-)

diff --git a/libstorycode/gtk/gtkslideview.c b/libstorycode/gtk/gtkslideview.c
index f3d7d59..913fd56 100644
--- a/libstorycode/gtk/gtkslideview.c
+++ b/libstorycode/gtk/gtkslideview.c
@@ -970,13 +970,14 @@ static void insert_text(char *t, GtkSlideView *e)
 	}
 
 	if ( strcmp(t, "\n") == 0 ) {
-		//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);
-		//emit_change_sig(e);
-		//redraw(e);
+		off = pos_trail_to_offset(e->cursor_frame, e->cpos.para,
+		                          e->cpos.pos, e->cpos.trail);
+		slide_item_split_text_paragraph(e->cursor_frame, e->cpos.para, off);
+		e->cpos.para++;
+		e->cpos.pos = 0;
+		e->cpos.trail = 0;
+		emit_change_sig(e);
+		redraw(e);
 		return;
 	}
 
diff --git a/libstorycode/slide.c b/libstorycode/slide.c
index 959693d..0702f52 100644
--- a/libstorycode/slide.c
+++ b/libstorycode/slide.c
@@ -307,3 +307,37 @@ void slide_item_get_padding(SlideItem *item, Stylesheet *ss,
 	*t = lcalc(padding[2], frw);
 	*b = lcalc(padding[3], frh);
 }
+
+
+void slide_item_split_text_paragraph(SlideItem *item, int para, size_t off)
+{
+	char **np;
+
+	np = realloc(item->paragraphs, (item->n_paras+1)*sizeof(char *));
+	if ( np == NULL ) return;
+
+#ifdef HAVE_PANGO
+	PangoLayout **nl;
+	nl = realloc(item->layouts, (item->n_paras+1)*sizeof(PangoLayout *));
+	if ( nl == NULL ) {
+		free(np);
+		return;
+	}
+	item->layouts = nl;
+#endif
+
+	item->paragraphs = np;
+	item->n_paras++;
+
+	memmove(&item->paragraphs[para+1], &item->paragraphs[para],
+	        (item->n_paras - para - 1)*sizeof(char *));
+
+#ifdef HAVE_PANGO
+	memmove(&item->layouts[para+1], &item->layouts[para],
+	        (item->n_paras - para - 1)*sizeof(PangoLayout *));
+	item->layouts[para+1] = NULL;
+#endif
+
+	item->paragraphs[para+1] = strdup(&item->paragraphs[para][off]);
+	item->paragraphs[para][off] = '\0';
+}
diff --git a/libstorycode/slide.h b/libstorycode/slide.h
index 6242d08..ab014d5 100644
--- a/libstorycode/slide.h
+++ b/libstorycode/slide.h
@@ -54,6 +54,8 @@ extern void slide_item_get_padding(SlideItem *item, Stylesheet *ss,
                                    double *l, double *r, double *t, double *b,
                                    double slide_w, double slide_h);
 
+extern void slide_item_split_text_paragraph(SlideItem *item, int para, size_t off);
+
 /* For debugging, not really part of API */
 extern void describe_slide(Slide *s);
 
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