patch 8.1.0772: the sign_define_by_name() function is too long

Problem:    The sign_define_by_name() function is too long.
Solution:   Split it into smaller functions. (Yegappan Lakshmanan,
            closes #3819)

src/sign.c

@@ -727,22 +727,12 @@ sign_find(char_u *name, sign_T **sp_prev)
 }
 
 /*
- * Define a new sign or update an existing sign
+ * Allocate a new sign
  */
-    int
-sign_define_by_name(
-	char_u	*name,
-	char_u	*icon,
-	char_u	*linehl,
-	char_u	*text,
-	char_u	*texthl)
+    static sign_T *
+alloc_new_sign(char_u *name)
 {
-    sign_T	*sp_prev;
     sign_T	*sp;
-
-    sp = sign_find(name, &sp_prev);
-    if (sp == NULL)
-    {
     sign_T	*lp;
     int	start = next_sign_typenr;
 
@@ -750,7 +740,7 @@ sign_define_by_name(
     sp = (sign_T *)alloc_clear_id((unsigned)sizeof(sign_T),
 	    aid_sign_define_by_name);
     if (sp == NULL)
-	    return FAIL;
+	return NULL;
 
     // Check that next_sign_typenr is not already being used.
     // This only happens after wrapping around.  Hopefully
@@ -766,7 +756,7 @@ sign_define_by_name(
 	    {
 		vim_free(sp);
 		emsg(_("E612: Too many signs defined"));
-		    return FAIL;
+		return NULL;
 	    }
 	    lp = first_sign;  // start all over
 	    continue;
@@ -782,18 +772,17 @@ sign_define_by_name(
     if (sp->sn_name == NULL)  // out of memory
     {
 	vim_free(sp);
-	    return FAIL;
+	return NULL;
     }
 
-	// add the new sign to the list of signs
-	if (sp_prev == NULL)
-	    first_sign = sp;
-	else
-	    sp_prev->sn_next = sp;
+    return sp;
 }
 
-    // set values for a defined sign.
-    if (icon != NULL)
+/*
+ * Initialize the icon information for a new sign
+ */
+    static void
+sign_define_init_icon(sign_T *sp, char_u *icon)
 {
     vim_free(sp->sn_icon);
     sp->sn_icon = vim_strsave(icon);
@@ -809,7 +798,11 @@ sign_define_by_name(
 # endif
 }
 
-    if (text != NULL)
+/*
+ * Initialize the text for a new sign
+ */
+    static int
+sign_define_init_text(sign_T *sp, char_u *text)
 {
     char_u	*s;
     char_u	*endp;
@@ -817,16 +810,17 @@ sign_define_by_name(
     int		len;
 
     endp = text + (int)STRLEN(text);
+
+    // Remove backslashes so that it is possible to use a space.
     for (s = text; s + 1 < endp; ++s)
 	if (*s == '\\')
 	{
-		// Remove a backslash, so that it is possible
-		// to use a space.
 	    STRMOVE(s, s + 1);
 	    --endp;
 	}
-# ifdef FEAT_MBYTE
+
     // Count cells and check for non-printable chars
+# ifdef FEAT_MBYTE
     if (has_mbyte)
     {
 	cells = 0;
@@ -845,7 +839,8 @@ sign_define_by_name(
 		break;
 	cells = (int)(s - text);
     }
-	// Currently must be one or two display cells
+
+    // Currently sign text must be one or two display cells
     if (s != endp || cells < 1 || cells > 2)
     {
 	semsg(_("E239: Invalid sign text: %s"), text);
@@ -858,10 +853,48 @@ sign_define_by_name(
     len = (int)(endp - text + ((cells == 1) ? 1 : 0));
     sp->sn_text = vim_strnsave(text, len);
 
+    // For single character sign text, pad with a space.
     if (sp->sn_text != NULL && cells == 1)
 	STRCPY(sp->sn_text + len - 1, " ");
+
+    return OK;
 }
 
+/*
+ * Define a new sign or update an existing sign
+ */
+    int
+sign_define_by_name(
+	char_u	*name,
+	char_u	*icon,
+	char_u	*linehl,
+	char_u	*text,
+	char_u	*texthl)
+{
+    sign_T	*sp_prev;
+    sign_T	*sp;
+
+    sp = sign_find(name, &sp_prev);
+    if (sp == NULL)
+    {
+	sp = alloc_new_sign(name);
+	if (sp == NULL)
+	    return FAIL;
+
+	// add the new sign to the list of signs
+	if (sp_prev == NULL)
+	    first_sign = sp;
+	else
+	    sp_prev->sn_next = sp;
+    }
+
+    // set values for a defined sign.
+    if (icon != NULL)
+	sign_define_init_icon(sp, icon);
+
+    if (text != NULL && (sign_define_init_text(sp, text) == FAIL))
+	return FAIL;
+
     if (linehl != NULL)
 	sp->sn_line_hl = syn_check_group(linehl, (int)STRLEN(linehl));
 

src/version.c

@@ -791,6 +791,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    772,
 /**/
     771,
 /**/