diff --git a/src/ex_cmdidxs.h b/src/ex_cmdidxs.h
new file mode 100644
index 0000000..3b6120e
--- /dev/null
+++ b/src/ex_cmdidxs.h
@@ -0,0 +1,72 @@
+/* Automatically generated code by create_cmdidxs.vim
+ *
+ * Table giving the index of the first command in cmdnames[] to lookup
+ * based on the first letter of a command.
+ */
+static const unsigned short cmdidxs1[26] =
+{
+  /* a */ 0,
+  /* b */ 19,
+  /* c */ 42,
+  /* d */ 103,
+  /* e */ 125,
+  /* f */ 145,
+  /* g */ 161,
+  /* h */ 167,
+  /* i */ 176,
+  /* j */ 194,
+  /* k */ 196,
+  /* l */ 201,
+  /* m */ 259,
+  /* n */ 277,
+  /* o */ 297,
+  /* p */ 309,
+  /* q */ 348,
+  /* r */ 351,
+  /* s */ 370,
+  /* t */ 437,
+  /* u */ 472,
+  /* v */ 483,
+  /* w */ 501,
+  /* x */ 516,
+  /* y */ 525,
+  /* z */ 526
+};
+
+/*
+ * Table giving the index of the first command in cmdnames[] to lookup
+ * based on the first 2 letters of a command.
+ * Values in cmdidxs2[c1][c2] are relative to cmdidxs1[c1] so that they
+ * fit in a byte.
+ */
+static const unsigned char cmdidxs2[26][26] =
+{ /*         a   b   c   d   e   f   g   h   i   j   k   l   m   n   o   p   q   r   s   t   u   v   w   x   y   z */
+  /* a */ {  0,  1,  0,  0,  0,  0,  0,  0,  0,  0,  0,  4,  5,  6,  0,  0,  0,  7, 15,  0, 16,  0,  0,  0,  0,  0 },
+  /* b */ {  2,  0,  0,  4,  5,  7,  0,  0,  0,  0,  0,  8,  9, 10, 11, 12,  0, 13,  0,  0,  0,  0, 22,  0,  0,  0 },
+  /* c */ {  3, 10, 12, 14, 16, 18, 21,  0,  0,  0,  0, 29, 33, 36, 42, 51, 53, 54, 55,  0, 57,  0, 60,  0,  0,  0 },
+  /* d */ {  0,  0,  0,  0,  0,  0,  0,  0,  6, 15,  0, 16,  0,  0, 17,  0,  0, 19, 20,  0,  0,  0,  0,  0,  0,  0 },
+  /* e */ {  1,  0,  2,  0,  0,  0,  0,  0,  0,  0,  0,  7,  9, 10,  0,  0,  0,  0,  0,  0,  0,  0,  0, 16,  0,  0 },
+  /* f */ {  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  9,  0,  0,  0,  0,  0, 15,  0,  0,  0,  0,  0 },
+  /* g */ {  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  1,  0,  0,  2,  0,  0,  4,  5,  0,  0,  0,  0 },
+  /* h */ {  5,  0,  0,  0,  0,  0,  0,  0,  6,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0 },
+  /* i */ {  1,  0,  0,  0,  0,  3,  0,  0,  0,  4,  0,  5,  6,  0,  0,  0,  0,  0, 13,  0, 15,  0,  0,  0,  0,  0 },
+  /* j */ {  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  1,  0,  0,  0,  0,  0 },
+  /* k */ {  0,  0,  0,  0,  1,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0 },
+  /* l */ {  3,  9, 11, 15, 16, 20, 23, 28,  0,  0,  0, 30, 33, 36, 40, 46,  0, 48, 57, 49, 50, 54, 56,  0,  0,  0 },
+  /* m */ {  1,  0,  0,  0,  7,  0,  0,  0,  0,  0, 10,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0, 16 },
+  /* n */ {  0,  1,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  5,  8, 10,  0,  0,  0,  0,  0, 17,  0,  0,  0,  0,  0 },
+  /* o */ {  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  1,  2,  5,  0,  0,  0,  0,  0,  0,  9,  0, 11,  0,  0,  0 },
+  /* p */ {  1,  0,  3,  0,  4,  0,  0,  0,  0,  0,  0,  0,  0,  0,  7,  9,  0,  0, 16, 17, 26,  0, 27,  0, 28,  0 },
+  /* q */ {  2,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0 },
+  /* r */ {  0,  0,  0,  0,  0,  0,  0,  0, 11,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0, 13, 18,  0,  0,  0,  0 },
+  /* s */ {  2,  6, 15,  0, 18, 22,  0, 24, 25,  0,  0, 28, 30, 34, 38, 40,  0, 48,  0, 49,  0, 61, 62,  0, 63,  0 },
+  /* t */ {  2,  0, 19,  0, 22, 23,  0, 24,  0, 25,  0, 26, 27, 28, 29, 30,  0, 31, 33,  0, 34,  0,  0,  0,  0,  0 },
+  /* u */ {  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0, 10,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0 },
+  /* v */ {  0,  0,  0,  0,  1,  0,  0,  0,  4,  0,  0,  0,  9, 12,  0,  0,  0,  0, 15,  0, 16,  0,  0,  0,  0,  0 },
+  /* w */ {  2,  0,  0,  0,  0,  0,  0,  3,  4,  0,  0,  0,  0,  8,  0,  9, 10,  0, 12,  0, 13, 14,  0,  0,  0,  0 },
+  /* x */ {  1,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  2,  5,  0,  0,  0,  0,  0,  0,  7,  0,  0,  0,  0,  0 },
+  /* y */ {  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0 },
+  /* z */ {  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0 }
+};
+
+static const int command_count = 539;