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authorHarry Jeffery <harry@exec64.co.uk>2019-09-02 15:03:33 +0100
committerHarry Jeffery <harry@exec64.co.uk>2019-09-02 15:54:50 +0100
commit42a15b157827dbd9c981416c8919ce5f5c907331 (patch)
tree31786a1a4bf6e67beced6533b9eb276f8a8ce3d8 /src
parentb8395af887ec1c3a3adfd8d56baa12caed740172 (diff)
downloadimv-42a15b157827dbd9c981416c8919ce5f5c907331.tar.gz
console: Use icu to provide proper UTF-8 editing
Diffstat (limited to 'src')
-rw-r--r--src/canvas.c7
-rw-r--r--src/canvas.h4
-rw-r--r--src/console.c102
-rw-r--r--src/console.h4
-rw-r--r--src/imv.c18
5 files changed, 124 insertions, 11 deletions
diff --git a/src/canvas.c b/src/canvas.c
index 4a00dbc..eaec538 100644
--- a/src/canvas.c
+++ b/src/canvas.c
@@ -127,7 +127,7 @@ void imv_canvas_font(struct imv_canvas *canvas, const char *name, int size)
pango_font_description_set_absolute_size(canvas->font, size * PANGO_SCALE);
}
-void imv_canvas_printf(struct imv_canvas *canvas, int x, int y, const char *fmt, ...)
+int imv_canvas_printf(struct imv_canvas *canvas, int x, int y, const char *fmt, ...)
{
char line[1024];
va_list args;
@@ -140,9 +140,14 @@ void imv_canvas_printf(struct imv_canvas *canvas, int x, int y, const char *fmt,
cairo_move_to(canvas->cairo, x, y);
pango_cairo_show_layout(canvas->cairo, layout);
+
+ PangoRectangle extents;
+ pango_layout_get_pixel_extents(layout, NULL, &extents);
+
g_object_unref(layout);
va_end(args);
+ return extents.width;
}
void imv_canvas_draw(struct imv_canvas *canvas)
diff --git a/src/canvas.h b/src/canvas.h
index 4f520fe..03425d9 100644
--- a/src/canvas.h
+++ b/src/canvas.h
@@ -37,8 +37,8 @@ void imv_canvas_fill_checkers(struct imv_canvas *canvas, int size);
/* Select the font to draw text with */
void imv_canvas_font(struct imv_canvas *canvas, const char *name, int size);
-/* Draw some text on the canvas */
-void imv_canvas_printf(struct imv_canvas *canvas, int x, int y, const char *fmt, ...);
+/* Draw some text on the canvas, returns the width used in pixels */
+int imv_canvas_printf(struct imv_canvas *canvas, int x, int y, const char *fmt, ...);
/* Blit the canvas to the current OpenGL framebuffer */
void imv_canvas_draw(struct imv_canvas *canvas);
diff --git a/src/console.c b/src/console.c
index 92e578d..01b7925 100644
--- a/src/console.c
+++ b/src/console.c
@@ -1,15 +1,65 @@
#include "console.h"
+#include <assert.h>
#include <stdlib.h>
#include <string.h>
+#include <unicode/utext.h>
+#include <unicode/ubrk.h>
struct imv_console {
char *buffer;
size_t buffer_len;
+ size_t cursor;
+
imv_console_callback callback;
void *callback_data;
};
+/* Iterates forwards over characters in a UTF-8 string */
+static size_t next_char(char *buffer, size_t position)
+{
+ size_t result = position;
+ UErrorCode status = U_ZERO_ERROR;
+ UText *ut = utext_openUTF8(NULL, buffer, -1, &status);
+
+ UBreakIterator *it = ubrk_open(UBRK_CHARACTER, NULL, NULL, 0, &status);
+ ubrk_setUText(it, ut, &status);
+
+ int boundary = ubrk_following(it, (int)position);
+ if (boundary != UBRK_DONE) {
+ result = (size_t)boundary;
+ }
+
+ ubrk_close(it);
+
+ utext_close(ut);
+ assert(U_SUCCESS(status));
+ return result;
+}
+
+/* Iterates backwards over characters in a UTF-8 string */
+static size_t prev_char(char *buffer, size_t position)
+{
+ size_t result = position;
+ UErrorCode status = U_ZERO_ERROR;
+ UText *ut = utext_openUTF8(NULL, buffer, -1, &status);
+
+ UBreakIterator *it = ubrk_open(UBRK_CHARACTER, NULL, NULL, 0, &status);
+ ubrk_setUText(it, ut, &status);
+
+ int boundary = ubrk_preceding(it, (int)position);
+ if (boundary != UBRK_DONE) {
+ result = (size_t)boundary;
+ }
+
+ ubrk_close(it);
+
+ utext_close(ut);
+ assert(U_SUCCESS(status));
+ return result;
+}
+
+
struct imv_console *imv_console_create(void)
{
struct imv_console *console = calloc(1, sizeof *console);
@@ -45,6 +95,7 @@ void imv_console_activate(struct imv_console *console)
}
console->buffer = calloc(1, console->buffer_len);
+ console->cursor = 0;
}
void imv_console_input(struct imv_console *console, const char *text)
@@ -53,7 +104,21 @@ void imv_console_input(struct imv_console *console, const char *text)
return;
}
- strncat(console->buffer, text, console->buffer_len - 1);
+ /* Increase buffer size if needed */
+ if (strlen(text) + strlen(console->buffer) + 1 > console->buffer_len) {
+ console->buffer_len *= 2;
+ console->buffer = realloc(console->buffer, console->buffer_len);
+ assert(console->buffer);
+ }
+
+ /* memmove over everything after the cursor right then copy in the new bytes */
+ size_t to_insert = strlen(text);
+ size_t old_cursor = console->cursor;
+ size_t new_cursor = console->cursor + to_insert;
+ size_t to_shift = strlen(console->buffer) - old_cursor;
+ memmove(&console->buffer[new_cursor], &console->buffer[old_cursor], to_shift);
+ memcpy(&console->buffer[old_cursor], text, to_insert);
+ console->cursor = new_cursor;
}
bool imv_console_key(struct imv_console *console, const char *key)
@@ -77,11 +142,33 @@ bool imv_console_key(struct imv_console *console, const char *key)
return true;
}
+ if (!strcmp("Left", key) || !strcmp("Ctrl+b", key)) {
+ console->cursor = prev_char(console->buffer, console->cursor);
+ return true;
+ }
+
+ if (!strcmp("Right", key) || !strcmp("Ctrl+f", key)) {
+ console->cursor = next_char(console->buffer, console->cursor);
+ return true;
+ }
+
+ if (!strcmp("Ctrl+a", key)) {
+ console->cursor = 0;
+ return true;
+ }
+
+ if (!strcmp("Ctrl+e", key)) {
+ console->cursor = strlen(console->buffer);
+ return true;
+ }
+
if (!strcmp("BackSpace", key)) {
- const size_t len = strlen(console->buffer);
- if (len > 0) {
- console->buffer[len - 1] = '\0';
- }
+ /* memmove everything after the cursor left */
+ size_t new_cursor = prev_char(console->buffer, console->cursor);
+ size_t old_cursor = console->cursor;
+ size_t to_shift = strlen(console->buffer) - new_cursor;
+ memmove(&console->buffer[new_cursor], &console->buffer[old_cursor], to_shift);
+ console->cursor = new_cursor;
return true;
}
@@ -93,6 +180,11 @@ const char *imv_console_prompt(struct imv_console *console)
return console->buffer;
}
+size_t imv_console_prompt_cursor(struct imv_console *console)
+{
+ return console->cursor;
+}
+
const char *imv_console_backlog(struct imv_console *console)
{
(void)console;
diff --git a/src/console.h b/src/console.h
index 22cf9b6..d8d270d 100644
--- a/src/console.h
+++ b/src/console.h
@@ -2,6 +2,7 @@
#define IMV_CONSOLE
#include <stdbool.h>
+#include <unistd.h>
struct imv_console;
@@ -33,6 +34,9 @@ bool imv_console_key(struct imv_console *console, const char *key);
/* What is the console prompt's current text? */
const char *imv_console_prompt(struct imv_console *console);
+/* What is the console prompt's current cursor position? (bytes into UTF-8 string) */
+size_t imv_console_prompt_cursor(struct imv_console *console);
+
/* What is the output history of the console? */
const char *imv_console_backlog(struct imv_console *console);
diff --git a/src/imv.c b/src/imv.c
index a612bb2..4231fd4 100644
--- a/src/imv.c
+++ b/src/imv.c
@@ -377,7 +377,7 @@ static void key_handler(struct imv *imv, const struct imv_event *event)
{
if (imv_console_is_active(imv->console)) {
- if (imv_console_key(imv->console, event->data.keyboard.keyname)) {
+ if (imv_console_key(imv->console, event->data.keyboard.description)) {
imv->need_redraw = true;
return;
}
@@ -1209,8 +1209,20 @@ static void render_window(struct imv *imv)
imv_canvas_fill_rectangle(imv->canvas, 0, wh - height - bottom_offset,
ww, height + bottom_offset);
imv_canvas_color(imv->canvas, 1, 1, 1, 1);
- imv_canvas_printf(imv->canvas, 0, wh - height - bottom_offset,
- ":%s\u2588", imv_console_prompt(imv->console));
+
+ int x = 0;
+ /* draw pre-cursor text */
+ x += imv_canvas_printf(imv->canvas, x, wh - height - bottom_offset,
+ ":%.*s",
+ imv_console_prompt_cursor(imv->console),
+ imv_console_prompt(imv->console));
+ /* draw the cursor */
+ imv_canvas_color(imv->canvas, 1, 1, 1, 0.5);
+ imv_canvas_printf(imv->canvas, x, wh - height - bottom_offset, "\u2588");
+ /* any any remaining text on top of the cursor */
+ imv_canvas_color(imv->canvas, 1, 1, 1, 1);
+ imv_canvas_printf(imv->canvas, x, wh - height - bottom_offset, "%s",
+ imv_console_prompt(imv->console) + imv_console_prompt_cursor(imv->console));
}
imv_canvas_draw(imv->canvas);