diff --git a/src/arabic.h b/src/arabic.h
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--- /dev/null
+++ b/src/arabic.h
@@ -0,0 +1,258 @@
+/* vi:set ts=8 sts=4 sw=4:
+ *
+ * VIM - Vi IMproved    by Bram Moolenaar
+ *
+ * Do ":help uganda"  in Vim to read copying and usage conditions.
+ * Do ":help credits" in Vim to see a list of people who contributed.
+ */
+
+/*
+ * Arabic characters are catagorized into following types:
+ *
+ * Isolated	- iso-8859-6 form	  char denoted with	a_*
+ * Initial	- unicode form-B start	  char denoted with	a_i_*
+ * Medial	- unicode form-B middle   char denoted with	a_m_*
+ * Final	- unicode form-B final	  char denoted with	a_f_*
+ * Stand-Alone	- unicode form-B isolated char denoted with	a_s_* (NOT USED)
+ *
+ * --
+ *
+ * Author: Nadim Shaikli & Isam Bayazidi
+ * - (based on Unicode)
+ *
+ */
+
+/*
+ * Arabic ISO-10646-1 character set definition
+ */
+
+/*
+ * Arabic ISO-8859-6 (subset of 10646; 0600 - 06FF)
+ */
+#define a_COMMA				0x060C
+#define a_SEMICOLON			0x061B
+#define a_QUESTION			0x061F
+#define a_HAMZA				0x0621
+#define a_ALEF_MADDA			0x0622
+#define a_ALEF_HAMZA_ABOVE		0x0623
+#define a_WAW_HAMZA			0x0624
+#define a_ALEF_HAMZA_BELOW		0x0625
+#define a_YEH_HAMZA			0x0626
+#define a_ALEF				0x0627
+#define a_BEH				0x0628
+#define a_TEH_MARBUTA			0x0629
+#define a_TEH				0x062a
+#define a_THEH				0x062b
+#define a_JEEM				0x062c
+#define a_HAH				0x062d
+#define a_KHAH				0x062e
+#define a_DAL				0x062f
+#define a_THAL				0x0630
+#define a_REH				0x0631
+#define a_ZAIN				0x0632
+#define a_SEEN				0x0633
+#define a_SHEEN				0x0634
+#define a_SAD				0x0635
+#define a_DAD				0x0636
+#define a_TAH				0x0637
+#define a_ZAH				0x0638
+#define a_AIN				0x0639
+#define a_GHAIN				0x063a
+#define a_TATWEEL			0x0640
+#define a_FEH				0x0641
+#define a_QAF				0x0642
+#define a_KAF				0x0643
+#define a_LAM				0x0644
+#define a_MEEM				0x0645
+#define a_NOON				0x0646
+#define a_HEH				0x0647
+#define a_WAW				0x0648
+#define a_ALEF_MAKSURA			0x0649
+#define a_YEH				0x064a
+
+#define a_FATHATAN			0x064b
+#define a_DAMMATAN			0x064c
+#define a_KASRATAN			0x064d
+#define a_FATHA				0x064e
+#define a_DAMMA				0x064f
+#define a_KASRA				0x0650
+#define a_SHADDA			0x0651
+#define a_SUKUN				0x0652
+
+#define a_MADDA_ABOVE			0x0653
+#define a_HAMZA_ABOVE			0x0654
+#define a_HAMZA_BELOW			0x0655
+
+#define a_ZERO				0x0660
+#define a_ONE				0x0661
+#define a_TWO				0x0662
+#define a_THREE				0x0663
+#define a_FOUR				0x0664
+#define a_FIVE				0x0665
+#define a_SIX				0x0666
+#define a_SEVEN				0x0667
+#define a_EIGHT				0x0668
+#define a_NINE				0x0669
+#define a_PERCENT			0x066a
+#define a_DECIMAL			0x066b
+#define a_THOUSANDS			0x066c
+#define a_STAR				0x066d
+#define a_MINI_ALEF			0x0670
+/* Rest of 8859-6 does not relate to Arabic */
+
+/*
+ * Arabic Presentation Form-B (subset of 10646; FE70 - FEFF)
+ *
+ *  s -> isolated
+ *  i -> initial
+ *  m -> medial
+ *  f -> final
+ *
+ */
+#define a_s_FATHATAN			0xfe70
+#define a_m_TATWEEL_FATHATAN		0xfe71
+#define a_s_DAMMATAN			0xfe72
+
+#define a_s_KASRATAN			0xfe74
+
+#define a_s_FATHA			0xfe76
+#define a_m_FATHA			0xfe77
+#define a_s_DAMMA			0xfe78
+#define a_m_DAMMA			0xfe79
+#define a_s_KASRA			0xfe7a
+#define a_m_KASRA			0xfe7b
+#define a_s_SHADDA			0xfe7c
+#define a_m_SHADDA			0xfe7d
+#define a_s_SUKUN			0xfe7e
+#define a_m_SUKUN			0xfe7f
+
+#define a_s_HAMZA			0xfe80
+#define a_s_ALEF_MADDA			0xfe81
+#define a_f_ALEF_MADDA			0xfe82
+#define a_s_ALEF_HAMZA_ABOVE		0xfe83
+#define a_f_ALEF_HAMZA_ABOVE		0xfe84
+#define a_s_WAW_HAMZA			0xfe85
+#define a_f_WAW_HAMZA			0xfe86
+#define a_s_ALEF_HAMZA_BELOW		0xfe87
+#define a_f_ALEF_HAMZA_BELOW		0xfe88
+#define a_s_YEH_HAMZA			0xfe89
+#define a_f_YEH_HAMZA			0xfe8a
+#define a_i_YEH_HAMZA			0xfe8b
+#define a_m_YEH_HAMZA			0xfe8c
+#define a_s_ALEF			0xfe8d
+#define a_f_ALEF			0xfe8e
+#define a_s_BEH				0xfe8f
+#define a_f_BEH				0xfe90
+#define a_i_BEH				0xfe91
+#define a_m_BEH				0xfe92
+#define a_s_TEH_MARBUTA			0xfe93
+#define a_f_TEH_MARBUTA			0xfe94
+#define a_s_TEH				0xfe95
+#define a_f_TEH				0xfe96
+#define a_i_TEH				0xfe97
+#define a_m_TEH				0xfe98
+#define a_s_THEH			0xfe99
+#define a_f_THEH			0xfe9a
+#define a_i_THEH			0xfe9b
+#define a_m_THEH			0xfe9c
+#define a_s_JEEM			0xfe9d
+#define a_f_JEEM			0xfe9e
+#define a_i_JEEM			0xfe9f
+#define a_m_JEEM			0xfea0
+#define a_s_HAH				0xfea1
+#define a_f_HAH				0xfea2
+#define a_i_HAH				0xfea3
+#define a_m_HAH				0xfea4
+#define a_s_KHAH			0xfea5
+#define a_f_KHAH			0xfea6
+#define a_i_KHAH			0xfea7
+#define a_m_KHAH			0xfea8
+#define a_s_DAL				0xfea9
+#define a_f_DAL				0xfeaa
+#define a_s_THAL			0xfeab
+#define a_f_THAL			0xfeac
+#define a_s_REH				0xfead
+#define a_f_REH				0xfeae
+#define a_s_ZAIN			0xfeaf
+#define a_f_ZAIN			0xfeb0
+#define a_s_SEEN			0xfeb1
+#define a_f_SEEN			0xfeb2
+#define a_i_SEEN			0xfeb3
+#define a_m_SEEN			0xfeb4
+#define a_s_SHEEN			0xfeb5
+#define a_f_SHEEN			0xfeb6
+#define a_i_SHEEN			0xfeb7
+#define a_m_SHEEN			0xfeb8
+#define a_s_SAD				0xfeb9
+#define a_f_SAD				0xfeba
+#define a_i_SAD				0xfebb
+#define a_m_SAD				0xfebc
+#define a_s_DAD				0xfebd
+#define a_f_DAD				0xfebe
+#define a_i_DAD				0xfebf
+#define a_m_DAD				0xfec0
+#define a_s_TAH				0xfec1
+#define a_f_TAH				0xfec2
+#define a_i_TAH				0xfec3
+#define a_m_TAH				0xfec4
+#define a_s_ZAH				0xfec5
+#define a_f_ZAH				0xfec6
+#define a_i_ZAH				0xfec7
+#define a_m_ZAH				0xfec8
+#define a_s_AIN				0xfec9
+#define a_f_AIN				0xfeca
+#define a_i_AIN				0xfecb
+#define a_m_AIN				0xfecc
+#define a_s_GHAIN			0xfecd
+#define a_f_GHAIN			0xfece
+#define a_i_GHAIN			0xfecf
+#define a_m_GHAIN			0xfed0
+#define a_s_FEH				0xfed1
+#define a_f_FEH				0xfed2
+#define a_i_FEH				0xfed3
+#define a_m_FEH				0xfed4
+#define a_s_QAF				0xfed5
+#define a_f_QAF				0xfed6
+#define a_i_QAF				0xfed7
+#define a_m_QAF				0xfed8
+#define a_s_KAF				0xfed9
+#define a_f_KAF				0xfeda
+#define a_i_KAF				0xfedb
+#define a_m_KAF				0xfedc
+#define a_s_LAM				0xfedd
+#define a_f_LAM				0xfede
+#define a_i_LAM				0xfedf
+#define a_m_LAM				0xfee0
+#define a_s_MEEM			0xfee1
+#define a_f_MEEM			0xfee2
+#define a_i_MEEM			0xfee3
+#define a_m_MEEM			0xfee4
+#define a_s_NOON			0xfee5
+#define a_f_NOON			0xfee6
+#define a_i_NOON			0xfee7
+#define a_m_NOON			0xfee8
+#define a_s_HEH				0xfee9
+#define a_f_HEH				0xfeea
+#define a_i_HEH				0xfeeb
+#define a_m_HEH				0xfeec
+#define a_s_WAW				0xfeed
+#define a_f_WAW				0xfeee
+#define a_s_ALEF_MAKSURA		0xfeef
+#define a_f_ALEF_MAKSURA		0xfef0
+#define a_s_YEH				0xfef1
+#define a_f_YEH				0xfef2
+#define a_i_YEH				0xfef3
+#define a_m_YEH				0xfef4
+#define a_s_LAM_ALEF_MADDA_ABOVE	0xfef5
+#define a_f_LAM_ALEF_MADDA_ABOVE	0xfef6
+#define a_s_LAM_ALEF_HAMZA_ABOVE	0xfef7
+#define a_f_LAM_ALEF_HAMZA_ABOVE	0xfef8
+#define a_s_LAM_ALEF_HAMZA_BELOW	0xfef9
+#define a_f_LAM_ALEF_HAMZA_BELOW	0xfefa
+#define a_s_LAM_ALEF			0xfefb
+#define a_f_LAM_ALEF			0xfefc
+
+#define a_BYTE_ORDER_MARK		0xfeff
+
+/* Range of Arabic characters that might be shaped. */
+#define ARABIC_CHAR(c)		((c) >= a_HAMZA && (c) <= a_MINI_ALEF)