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	tShow tabs with > symbols - ve - a minimal text editor (work in progress)
	git clone git://src.adamsgaard.dk/ve
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	---
	commit ec3976286cbc8ff16cf02429d735951bb80a29d4
	parent d459a5c2e81581c2019aa6ef69c99bc08d8180f2
	Author: Anders Damsgaard <[email protected]>
	Date: Tue, 6 Aug 2019 13:46:18 +0200

	Show tabs with > symbols

	Diffstat:
	M byote.h \| 8 ++++++--
	M io.c \| 40 +++++++++++++++++++++++++++++…
	M output.c \| 4 ++--

	3 files changed, 47 insertions(+), 5 deletions(-)
	---
	diff --git a/byote.h b/byote.h
	t@@ -6,10 +6,14 @@
	#define PROGNAME "byote"
	#define VERSION "0.0.1"

	+#define TAB_WIDTH 4
	+
	/* editor row: stores a row of text */
	typedef struct eRow {
	- int size;
	- char *chars;
	+ char chars; / text read from file */
	+ char rchars; / text to render */
	+ int size; /* length of chars */
	+ int rsize; /* length of rchars */
	} eRow;

	struct editor_config {
	diff --git a/io.c b/io.c
	t@@ -10,7 +10,40 @@
	#include "byote.h"
	#include "terminal.h"

	-void editor_append_row(char *s, size_t len)
	+/* translate tabs before display */
	+void
	+editor_update_row(eRow* row)
	+{
	+ int j, idx, tabs;
	+
	+ free(row->rchars);
	+ row->rchars = malloc(row->size + 1);
	+
	+ tabs = 0;
	+ for (j=0; j<row->size; ++j)
	+ if (row->chars[j] == '\t')
	+ tabs++;
	+
	+ free(row->rchars);
	+ row->rchars = malloc(row->size + tabs*(TAB_WIDTH - 1) + 1);
	+
	+ idx = 0;
	+ for (j=0; j<row->size; ++j) {
	+ if (row->chars[j] == '\t') {
	+ row->rchars[idx++] = '>';
	+ while (idx % TAB_WIDTH != 0)
	+ row->rchars[idx++] = ' ';
	+ } else {
	+ row->rchars[idx++] = row->chars[j];
	+ }
	+ }
	+ row->rchars[idx] = '\0';
	+ row->rsize = idx;
	+}
	+
	+/* add row to buffer */
	+void
	+editor_append_row(char *s, size_t len)
	{
	int i;

	t@@ -20,6 +53,11 @@ void editor_append_row(char *s, size_t len)
	E.row[i].chars = malloc(len + 1);
	memcpy(E.row[i].chars, s, len);
	E.row[i].chars[len] = '\0';
	+
	+ E.row[i].rsize = 0;
	+ E.row[i].rchars = NULL;
	+ editor_update_row(&E.row[i]);
	+
	++E.num_rows;
	}

	diff --git a/output.c b/output.c
	t@@ -94,12 +94,12 @@ editor_draw_rows(struct abuf *ab)
	if (y == E.screen_rows-1) {
	draw_status(ab);
	} else if (file_row < E.num_rows) {
	- len = E.row[file_row].size - E.column_offset;
	+ len = E.row[file_row].rsize - E.column_offset;
	if (len < 0)
	len = 0;
	if (len > E.screen_columns)
	len = E.screen_columns;
	- ab_append(ab, &E.row[file_row].chars[E.column_offset],…
	+ ab_append(ab, &E.row[file_row].rchars[E.column_offset]…
	} else {
	ab_append(ab, "~", 1);
	}