From 890e5ac7b89f5cccf120d966dc488f9ddd516a3d Mon Sep 17 00:00:00 2001
From: Thomas White <taw@bitwiz.org.uk>
Date: Tue, 19 Apr 2016 22:25:05 +0200
Subject: Clarify that cursor_pos is BYTE offset (not character)

---
 src/frame.c | 91 ++++++++++++++++++++++++++++++++++++++++++++++++++-----------
 1 file changed, 75 insertions(+), 16 deletions(-)

(limited to 'src/frame.c')

diff --git a/src/frame.c b/src/frame.c
index a0124a7..3699b74 100644
--- a/src/frame.c
+++ b/src/frame.c
@@ -542,7 +542,7 @@ size_t end_offset_of_para(struct frame *fr, int pn)
 
 
 /* Local x,y in paragraph -> text offset */
-static int text_para_pos(Paragraph *para, double x, double y, int *ptrail)
+static size_t text_para_pos(Paragraph *para, double x, double y, int *ptrail)
 {
 	int idx;
 	pango_layout_xy_to_index(para->layout, pango_units_from_double(x),
@@ -552,7 +552,7 @@ static int text_para_pos(Paragraph *para, double x, double y, int *ptrail)
 
 
 int find_cursor(struct frame *fr, double x, double y,
-                int *ppara, int *ppos, int *ptrail)
+                int *ppara, size_t *ppos, int *ptrail)
 {
 	double pos = fr->pad_t;
 	int i;
@@ -657,16 +657,19 @@ int get_cursor_pos(struct frame *fr, int cursor_para, int cursor_pos,
 }
 
 
-void cursor_moveh(struct frame *fr, int *cpara, int *cpos, int *ctrail,
+void cursor_moveh(struct frame *fr, int *cpara, size_t *cpos, int *ctrail,
                   signed int dir)
 {
 	Paragraph *para = fr->paras[*cpara];
+	int np = *cpos;
 
-	if ( (*cpos+*ctrail == end_offset_of_para(fr, *cpara)) && (dir > 0) ) {
-		if ( *cpara < fr->n_paras-1 ) {
-			(*cpara)++;
-			*cpos = 0;
-			*ctrail = 0;
+	pango_layout_move_cursor_visually(para->layout, 1, *cpos, *ctrail,
+	                                  dir, &np, ctrail);
+	if ( np == -1 ) {
+		if ( *cpara > 0 ) {
+			(*cpara)--;
+			*cpos = end_offset_of_para(fr, *cpara) - 1;
+			*ctrail = 1;
 			return;
 		} else {
 			/* Can't move any further */
@@ -674,23 +677,23 @@ void cursor_moveh(struct frame *fr, int *cpara, int *cpos, int *ctrail,
 		}
 	}
 
-	if ( (*cpos+*ctrail == 0) && (dir < 0) ) {
-		if ( *cpara > 0 ) {
-			(*cpara)--;
-			*cpos = end_offset_of_para(fr, *cpara) - 1;
-			*ctrail = 1;
+	if ( np == G_MAXINT ) {
+		if ( *cpara < fr->n_paras-1 ) {
+			(*cpara)++;
+			*cpos = 0;
+			*ctrail = 0;
 			return;
 		} else {
 			/* Can't move any further */
 			return;
 		}
 	}
-	pango_layout_move_cursor_visually(para->layout, 1, *cpos, *ctrail,
-	                                  dir, cpos, ctrail);
+
+	*cpos = np;
 }
 
 
-void cursor_movev(struct frame *fr, int *cpara, int *cpos, int *ctrail,
+void cursor_movev(struct frame *fr, int *cpara, size_t *cpos, int *ctrail,
                   signed int dir)
 {
 }
@@ -793,3 +796,59 @@ void delete_text_in_paragraph(Paragraph *para, size_t offs1, size_t offs2)
 		printf("Multi-run delete!\n");
 	}
 }
+
+
+static void split_text_paragraph(struct frame *fr, int pn, int pos,
+                                 PangoContext *pc)
+{
+	Paragraph *pnew;
+	int i, j;
+	int run;
+	Paragraph *para = fr->paras[pn];
+
+	pnew = insert_paragraph(fr, pn);
+	if ( pnew == NULL ) {
+		fprintf(stderr, "Failed to insert paragraph\n");
+		return;
+	}
+
+	/* Determine which run the cursor is in */
+	run = which_run(para, pos);
+
+	pnew->type = PARA_TYPE_TEXT;
+	pnew->open = para->open;
+	pnew->n_runs = para->n_runs - run;
+	pnew->runs = malloc(pnew->n_runs * sizeof(struct text_run));
+	if ( pnew->runs == NULL ) {
+		fprintf(stderr, "Failed to allocate runs.\n");
+		return; /* Badness is coming */
+	}
+
+	/* If the position is right at the start of a run, the whole run
+	 * gets moved to the next paragraph */
+	if ( para->runs[run].para_offs_bytes ) {
+	}
+
+	j = 0;
+	for ( i=run; i<para->n_runs; i++ ) {
+		pnew->runs[j++] = para->runs[i];
+	}
+
+	para->open = 0;
+	para->n_runs = run+1;
+
+	wrap_paragraph(para, pc, fr->w);
+	wrap_paragraph(pnew, pc, fr->w);
+}
+
+
+void split_paragraph(struct frame *fr, int pn, int pos, PangoContext *pc)
+{
+	Paragraph *para = fr->paras[pn];
+
+	if ( para->type == PARA_TYPE_TEXT ) {
+		split_text_paragraph(fr, pn, pos, pc);
+	} else {
+		/* Other types can't be split */
+	}
+}
-- 
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