From 274c358df557f399e4a4394c6cc8c14da6c33762 Mon Sep 17 00:00:00 2001
From: Cem Keylan <cem@ckyln.com>
Date: Mon, 4 Oct 2021 17:30:33 +0300
Subject: imv: use libgrapheme instead of icu

---
 meson.build   |  4 ++-
 src/console.c | 78 ++++++++++++++++++++++++++++++++++++++---------------------
 2 files changed, 53 insertions(+), 29 deletions(-)

diff --git a/meson.build b/meson.build
index 7cf64b5..dd1944b 100644
--- a/meson.build
+++ b/meson.build
@@ -44,12 +44,14 @@ if not gl_dep.found()
   gl_dep = dependency('opengl')
 endif
 
+libgrapheme = cc.find_library('grapheme')
+
 deps_for_imv = [
   dependency('pangocairo'),
   gl_dep,
   dependency('threads'),
   dependency('xkbcommon'),
-  dependency('icu-io'),
+  libgrapheme,
   dependency('inih', fallback : ['inih', 'inih_dep']),
   m_dep,
 ]
diff --git a/src/console.c b/src/console.c
index 073274f..7286288 100644
--- a/src/console.c
+++ b/src/console.c
@@ -6,8 +6,7 @@
 #include <ctype.h>
 #include <stdlib.h>
 #include <string.h>
-#include <unicode/utext.h>
-#include <unicode/ubrk.h>
+#include <grapheme.h>
 
 struct imv_console {
   char *buffer;
@@ -22,25 +21,57 @@ struct imv_console {
   char *history_before; /* contents of line before history was opened */
 };
 
-/* Iterates forwards over characters in a UTF-8 string */
-static size_t next_char(char *buffer, size_t position)
+static size_t grapheme_strlen(char *str)
 {
-  size_t result = position;
-  UErrorCode status = U_ZERO_ERROR;
-  UText *ut = utext_openUTF8(NULL, buffer, -1, &status);
+  size_t len = 0, ret = 0;
+  char *s = strdup(str);
+  while (*s != '\0') {
+    len = grapheme_bytelen(s);
+    ret += len;
+    s   += len;
+  }
+  return ret;
+}
 
-  UBreakIterator *it = ubrk_open(UBRK_CHARACTER, NULL, NULL, 0, &status);
-  ubrk_setUText(it, ut, &status);
+static int32_t grapheme_following(char* str, size_t strlength, int32_t offset)
+{
+  int32_t result;
+  char *s = strdup(str);
+  s += offset;
+  if (!((int)offset<(int)strlength)||*s=='\0')
+    return -1;
+  result = (int32_t) grapheme_bytelen(s);
+  return ((result + offset) > strlength) ? -2 : result + offset;
+}
 
-  int boundary = ubrk_following(it, (int)position);
-  if (boundary != UBRK_DONE) {
-    result = (size_t)boundary;
+static int32_t grapheme_preceding(char *str, size_t strlength, int32_t offset)
+{
+  size_t len;
+  int32_t result = 0;
+  if (offset<=0)
+    return -1;
+  char *s = strdup(str);
+  while (*s != '\0' && result < strlength) {
+    len = grapheme_bytelen(s);
+    s += len;
+    if ((result + (int32_t)len) < offset)
+      result += (int32_t)len;
+    else
+      return result;
   }
+  return -2;
+}
 
-  ubrk_close(it);
+/* Iterates forwards over characters in a UTF-8 string */
+static size_t next_char(char *buffer, size_t position)
+{
+  size_t result = position;
+  size_t length = grapheme_strlen(buffer);
+  int boundary = grapheme_following(buffer, length, position);
+  if (!(boundary < 0))
+    result = (size_t)boundary;
 
-  utext_close(ut);
-  assert(U_SUCCESS(status));
+  assert(boundary != -2);
   return result;
 }
 
@@ -48,21 +79,12 @@ static size_t next_char(char *buffer, size_t position)
 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) {
+  size_t length = grapheme_strlen(buffer);
+  int boundary = grapheme_preceding(buffer, length, position);
+  if (!(boundary < 0))
     result = (size_t)boundary;
-  }
-
-  ubrk_close(it);
 
-  utext_close(ut);
-  assert(U_SUCCESS(status));
+  assert(boundary != -2);
   return result;
 }
 
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