diff --git a/src/if_cscope.c b/src/if_cscope.c
index 3252ff4..ffb1784 100644
--- a/src/if_cscope.c
+++ b/src/if_cscope.c
@@ -221,25 +221,26 @@
     expand_what = (cmdidx == CMD_scscope)
 			? EXP_SCSCOPE_SUBCMD : EXP_CSCOPE_SUBCMD;
 
+    if (*arg == NUL)
+	return;
+
     // (part of) subcommand already typed
-    if (*arg != NUL)
-    {
-	p = skiptowhite(arg);
-	if (*p != NUL)		    // past first word
-	{
-	    xp->xp_pattern = skipwhite(p);
-	    if (*skiptowhite(xp->xp_pattern) != NUL)
-		xp->xp_context = EXPAND_NOTHING;
-	    else if (STRNICMP(arg, "add", p - arg) == 0)
-		xp->xp_context = EXPAND_FILES;
-	    else if (STRNICMP(arg, "kill", p - arg) == 0)
-		expand_what = EXP_CSCOPE_KILL;
-	    else if (STRNICMP(arg, "find", p - arg) == 0)
-		expand_what = EXP_CSCOPE_FIND;
-	    else
-		xp->xp_context = EXPAND_NOTHING;
-	}
-    }
+    p = skiptowhite(arg);
+    if (*p == NUL)
+	return;
+
+    // past first word
+    xp->xp_pattern = skipwhite(p);
+    if (*skiptowhite(xp->xp_pattern) != NUL)
+	xp->xp_context = EXPAND_NOTHING;
+    else if (STRNICMP(arg, "add", p - arg) == 0)
+	xp->xp_context = EXPAND_FILES;
+    else if (STRNICMP(arg, "kill", p - arg) == 0)
+	expand_what = EXP_CSCOPE_KILL;
+    else if (STRNICMP(arg, "find", p - arg) == 0)
+	expand_what = EXP_CSCOPE_FIND;
+    else
+	xp->xp_context = EXPAND_NOTHING;
 }
 
 /*
diff --git a/src/if_lua.c b/src/if_lua.c
index 78bc190..6941789 100644
--- a/src/if_lua.c
+++ b/src/if_lua.c
@@ -505,18 +505,20 @@
 {
     void *p = lua_touserdata(L, ud);
 
-    if (p != NULL) // value is userdata?
+    if (p == NULL)
+	return NULL;
+
+    // value is userdata
+    if (lua_getmetatable(L, ud)) // does it have a metatable?
     {
-	if (lua_getmetatable(L, ud)) // does it have a metatable?
+	luaV_getfield(L, tname); // get metatable
+	if (lua_rawequal(L, -1, -2)) // MTs match?
 	{
-	    luaV_getfield(L, tname); // get metatable
-	    if (lua_rawequal(L, -1, -2)) // MTs match?
-	    {
-		lua_pop(L, 2); // MTs
-		return p;
-	    }
+	    lua_pop(L, 2); // MTs
+	    return p;
 	}
     }
+
     return NULL;
 }
 
@@ -1090,17 +1092,19 @@
     dictitem_T *di = dict_find(d, key, -1);
 
     if (di == NULL)
-	lua_pushnil(L);
-    else
     {
-	luaV_pushtypval(L, &di->di_tv);
-	if (di->di_tv.v_type == VAR_FUNC) // funcref?
-	{
-	    luaV_Funcref *f = (luaV_Funcref *) lua_touserdata(L, -1);
-	    f->self = d; // keep "self" reference
-	    d->dv_refcount++;
-	}
+	lua_pushnil(L);
+	return 1;
     }
+
+    luaV_pushtypval(L, &di->di_tv);
+    if (di->di_tv.v_type == VAR_FUNC) // funcref?
+    {
+	luaV_Funcref *f = (luaV_Funcref *) lua_touserdata(L, -1);
+	f->self = d; // keep "self" reference
+	d->dv_refcount++;
+    }
+
     return 1;
 }
 
@@ -1235,20 +1239,22 @@
     blob_T *b = luaV_unbox(L, luaV_Blob, 1);
     if (b->bv_lock)
 	luaL_error(L, "blob is locked");
-    if (lua_isnumber(L, 2))
+
+    if (!lua_isnumber(L, 2))
+	return 0;
+
+    long len = blob_len(b);
+    int idx = luaL_checkinteger(L, 2);
+    int val = luaL_checkinteger(L, 3);
+    if (idx < len || (idx == len && ga_grow(&b->bv_ga, 1) == OK))
     {
-	long len = blob_len(b);
-	int idx = luaL_checkinteger(L, 2);
-	int val = luaL_checkinteger(L, 3);
-	if (idx < len || (idx == len && ga_grow(&b->bv_ga, 1) == OK))
-	{
-	    blob_set(b, idx, (char_u) val);
-	    if (idx == len)
-		++b->bv_ga.ga_len;
-	}
-	else
-	    luaL_error(L, "index out of range");
+	blob_set(b, idx, (char_u) val);
+	if (idx == len)
+	    ++b->bv_ga.ga_len;
     }
+    else
+	luaL_error(L, "index out of range");
+
     return 0;
 }
 
@@ -1943,30 +1949,34 @@
 
     if (initarg && lua_type(L, 1) != LUA_TTABLE)
 	luaL_error(L, "table expected, got %s", luaL_typename(L, 1));
+
     l = list_alloc();
     if (l == NULL)
-	lua_pushnil(L);
-    else
     {
-	luaV_newlist(L, l);
-	if (initarg) // traverse table to init list
-	{
-	    int notnil, i = 0;
-	    typval_T v;
-	    do
-	    {
-		lua_rawgeti(L, 1, ++i);
-		notnil = !lua_isnil(L, -1);
-		if (notnil)
-		{
-		    luaV_checktypval(L, -1, &v, "vim.list");
-		    list_append_tv(l, &v);
-		    clear_tv(&v);
-		}
-		lua_pop(L, 1); // value
-	    } while (notnil);
-	}
+	lua_pushnil(L);
+	return 1;
     }
+
+    luaV_newlist(L, l);
+    if (!initarg)
+	return 1;
+
+    // traverse table to init list
+    int notnil, i = 0;
+    typval_T v;
+    do
+    {
+	lua_rawgeti(L, 1, ++i);
+	notnil = !lua_isnil(L, -1);
+	if (notnil)
+	{
+	    luaV_checktypval(L, -1, &v, "vim.list");
+	    list_append_tv(l, &v);
+	    clear_tv(&v);
+	}
+	lua_pop(L, 1); // value
+    } while (notnil);
+
     return 1;
 }
 
@@ -1978,43 +1988,47 @@
 
     if (initarg && lua_type(L, 1) != LUA_TTABLE)
 	luaL_error(L, "table expected, got %s", luaL_typename(L, 1));
+
     d = dict_alloc();
     if (d == NULL)
-	lua_pushnil(L);
-    else
     {
-	luaV_newdict(L, d);
-	if (initarg) // traverse table to init dict
+	lua_pushnil(L);
+	return 1;
+    }
+
+    luaV_newdict(L, d);
+    if (!initarg)
+	return 1;
+
+    // traverse table to init dict
+    lua_pushnil(L);
+    while (lua_next(L, 1))
+    {
+	char_u *key;
+	dictitem_T *di;
+	typval_T v;
+
+	lua_pushvalue(L, -2); // dup key in case it's a number
+	key = (char_u *) lua_tostring(L, -1);
+	if (key == NULL)
 	{
 	    lua_pushnil(L);
-	    while (lua_next(L, 1))
-	    {
-		char_u *key;
-		dictitem_T *di;
-		typval_T v;
-
-		lua_pushvalue(L, -2); // dup key in case it's a number
-		key = (char_u *) lua_tostring(L, -1);
-		if (key == NULL)
-		{
-		    lua_pushnil(L);
-		    return 1;
-		}
-		if (*key == NUL)
-		    luaL_error(L, "table has empty key");
-		luaV_checktypval(L, -2, &v, "vim.dict"); // value
-		di = dictitem_alloc(key);
-		if (di == NULL || dict_add(d, di) == FAIL)
-		{
-		    vim_free(di);
-		    lua_pushnil(L);
-		    return 1;
-		}
-		di->di_tv = v;
-		lua_pop(L, 2); // key copy and value
-	    }
+	    return 1;
 	}
+	if (*key == NUL)
+	    luaL_error(L, "table has empty key");
+	luaV_checktypval(L, -2, &v, "vim.dict"); // value
+	di = dictitem_alloc(key);
+	if (di == NULL || dict_add(d, di) == FAIL)
+	{
+	    vim_free(di);
+	    lua_pushnil(L);
+	    return 1;
+	}
+	di->di_tv = v;
+	lua_pop(L, 2); // key copy and value
     }
+
     return 1;
 }
 
@@ -2026,22 +2040,26 @@
 
     if (initarg && !lua_isstring(L, 1))
 	luaL_error(L, "string expected, got %s", luaL_typename(L, 1));
+
     b = blob_alloc();
     if (b == NULL)
-	lua_pushnil(L);
-    else
     {
-	luaV_newblob(L, b);
-	if (initarg)
-	{
-	    size_t i, l = 0;
-	    const char *s = lua_tolstring(L, 1, &l);
-
-	    if (ga_grow(&b->bv_ga, (int)l) == OK)
-		for (i = 0; i < l; ++i)
-		    ga_append(&b->bv_ga, s[i]);
-	}
+	lua_pushnil(L);
+	return 1;
     }
+
+    luaV_newblob(L, b);
+    if (!initarg)
+	return 1;
+
+    // traverse table to init blob
+    size_t i, l = 0;
+    const char *s = lua_tolstring(L, 1, &l);
+
+    if (ga_grow(&b->bv_ga, (int)l) == OK)
+	for (i = 0; i < l; ++i)
+	    ga_append(&b->bv_ga, s[i]);
+
     return 1;
 }
 
@@ -2548,28 +2566,29 @@
     static int
 lua_init(void)
 {
-    if (!lua_isopen())
-    {
+    if (lua_isopen())
+	return OK;
+
 #ifdef DYNAMIC_LUA
-	if (!lua_enabled(TRUE))
-	{
-	    emsg(_("Lua library cannot be loaded."));
-	    return FAIL;
-	}
-#endif
-	L = luaV_newstate();
+    if (!lua_enabled(TRUE))
+    {
+	emsg(_("Lua library cannot be loaded."));
+	return FAIL;
     }
+#endif
+    L = luaV_newstate();
+
     return OK;
 }
 
     void
 lua_end(void)
 {
-    if (lua_isopen())
-    {
-	lua_close(L);
-	L = NULL;
-    }
+    if (!lua_isopen())
+	return;
+
+    lua_close(L);
+    L = NULL;
 }
 
 /*
@@ -2698,31 +2717,32 @@
 {
     int aborted = 0;
 
-    if (lua_isopen())
-    {
-	luaV_getfield(L, LUAVIM_SETREF);
-	// call the function with 1 arg, getting 1 result back
-	lua_pushinteger(L, copyID);
-	lua_call(L, 1, 1);
-	// get the result
-	aborted = lua_tointeger(L, -1);
-	// pop result off the stack
-	lua_pop(L, 1);
-    }
+    if (!lua_isopen())
+	return 0;
+
+    luaV_getfield(L, LUAVIM_SETREF);
+    // call the function with 1 arg, getting 1 result back
+    lua_pushinteger(L, copyID);
+    lua_call(L, 1, 1);
+    // get the result
+    aborted = lua_tointeger(L, -1);
+    // pop result off the stack
+    lua_pop(L, 1);
+
     return aborted;
 }
 
     void
 update_package_paths_in_lua()
 {
-    if (lua_isopen())
-    {
-	lua_getglobal(L, "vim");
-	lua_getfield(L, -1, "_update_package_paths");
+    if (!lua_isopen())
+	return;
 
-	if (lua_pcall(L, 0, 0, 0))
-	    luaV_emsg(L);
-    }
+    lua_getglobal(L, "vim");
+    lua_getfield(L, -1, "_update_package_paths");
+
+    if (lua_pcall(L, 0, 0, 0))
+	luaV_emsg(L);
 }
 
 /*
diff --git a/src/if_mzsch.c b/src/if_mzsch.c
index 0363b8f..7492237 100644
--- a/src/if_mzsch.c
+++ b/src/if_mzsch.c
@@ -1352,24 +1352,24 @@
     void
 mzscheme_buffer_free(buf_T *buf)
 {
-    if (buf->b_mzscheme_ref)
-    {
-	vim_mz_buffer *bp = NULL;
-	MZ_GC_DECL_REG(1);
-	MZ_GC_VAR_IN_REG(0, bp);
-	MZ_GC_REG();
+    if (buf->b_mzscheme_ref == NULL)
+	return;
 
-	bp = BUFFER_REF(buf);
-	bp->buf = INVALID_BUFFER_VALUE;
+    vim_mz_buffer *bp = NULL;
+    MZ_GC_DECL_REG(1);
+    MZ_GC_VAR_IN_REG(0, bp);
+    MZ_GC_REG();
+
+    bp = BUFFER_REF(buf);
+    bp->buf = INVALID_BUFFER_VALUE;
 #ifndef MZ_PRECISE_GC
-	scheme_gc_ptr_ok(bp);
+    scheme_gc_ptr_ok(bp);
 #else
-	scheme_free_immobile_box(buf->b_mzscheme_ref);
+    scheme_free_immobile_box(buf->b_mzscheme_ref);
 #endif
-	buf->b_mzscheme_ref = NULL;
-	MZ_GC_CHECK();
-	MZ_GC_UNREG();
-    }
+    buf->b_mzscheme_ref = NULL;
+    MZ_GC_CHECK();
+    MZ_GC_UNREG();
 }
 
 /*
@@ -1378,23 +1378,23 @@
     void
 mzscheme_window_free(win_T *win)
 {
-    if (win->w_mzscheme_ref)
-    {
-	vim_mz_window *wp = NULL;
-	MZ_GC_DECL_REG(1);
-	MZ_GC_VAR_IN_REG(0, wp);
-	MZ_GC_REG();
-	wp = WINDOW_REF(win);
-	wp->win = INVALID_WINDOW_VALUE;
+    if (win->w_mzscheme_ref == NULL)
+	return;
+
+    vim_mz_window *wp = NULL;
+    MZ_GC_DECL_REG(1);
+    MZ_GC_VAR_IN_REG(0, wp);
+    MZ_GC_REG();
+    wp = WINDOW_REF(win);
+    wp->win = INVALID_WINDOW_VALUE;
 #ifndef MZ_PRECISE_GC
-	scheme_gc_ptr_ok(wp);
+    scheme_gc_ptr_ok(wp);
 #else
-	scheme_free_immobile_box(win->w_mzscheme_ref);
+    scheme_free_immobile_box(win->w_mzscheme_ref);
 #endif
-	win->w_mzscheme_ref = NULL;
-	MZ_GC_CHECK();
-	MZ_GC_UNREG();
-    }
+    win->w_mzscheme_ref = NULL;
+    MZ_GC_CHECK();
+    MZ_GC_UNREG();
 }
 
 /*
@@ -1406,15 +1406,15 @@
     char_u	*script;
 
     script = script_get(eap, eap->arg);
-    if (!eap->skip)
+    if (eap->skip)
+	return;
+
+    if (script == NULL)
+	do_mzscheme_command(eap, eap->arg, do_eval);
+    else
     {
-	if (script == NULL)
-	    do_mzscheme_command(eap, eap->arg, do_eval);
-	else
-	{
-	    do_mzscheme_command(eap, script, do_eval);
-	    vim_free(script);
-	}
+	do_mzscheme_command(eap, script, do_eval);
+	vim_free(script);
     }
 }
 
@@ -1489,20 +1489,20 @@
     static void
 init_exn_catching_apply(void)
 {
-    if (!exn_catching_apply)
-    {
-	char *e =
-	    "(lambda (thunk) "
-		"(with-handlers ([void (lambda (exn) (cons #f exn))]) "
-		"(cons #t (thunk))))";
+    if (exn_catching_apply)
+	return;
 
-	exn_catching_apply = scheme_eval_string(e, environment);
-	MZ_GC_CHECK();
-	exn_p = scheme_builtin_value("exn?");
-	MZ_GC_CHECK();
-	exn_message = scheme_builtin_value("exn-message");
-	MZ_GC_CHECK();
-    }
+    char *e =
+	"(lambda (thunk) "
+	"(with-handlers ([void (lambda (exn) (cons #f exn))]) "
+	"(cons #t (thunk))))";
+
+    exn_catching_apply = scheme_eval_string(e, environment);
+    MZ_GC_CHECK();
+    exn_p = scheme_builtin_value("exn?");
+    MZ_GC_CHECK();
+    exn_message = scheme_builtin_value("exn-message");
+    MZ_GC_CHECK();
 }
 
 /*
@@ -3827,44 +3827,45 @@
     static Scheme_Object *
 sandbox_file_guard(int argc UNUSED, Scheme_Object **argv)
 {
-    if (sandbox)
+    if (!sandbox)
+	return scheme_void;
+
+    Scheme_Object *requested_access = argv[2];
+
+    if (M_write == NULL)
     {
-	Scheme_Object *requested_access = argv[2];
-
-	if (M_write == NULL)
-	{
-	    MZ_REGISTER_STATIC(M_write);
-	    M_write = scheme_intern_symbol("write");
-	    MZ_GC_CHECK();
-	}
-	if (M_read == NULL)
-	{
-	    MZ_REGISTER_STATIC(M_read);
-	    M_read = scheme_intern_symbol("read");
-	    MZ_GC_CHECK();
-	}
-	if (M_execute == NULL)
-	{
-	    MZ_REGISTER_STATIC(M_execute);
-	    M_execute = scheme_intern_symbol("execute");
-	    MZ_GC_CHECK();
-	}
-	if (M_delete == NULL)
-	{
-	    MZ_REGISTER_STATIC(M_delete);
-	    M_delete = scheme_intern_symbol("delete");
-	    MZ_GC_CHECK();
-	}
-
-	while (!SCHEME_NULLP(requested_access))
-	{
-	    Scheme_Object *item = SCHEME_CAR(requested_access);
-	    if (scheme_eq(item, M_write) || scheme_eq(item, M_read)
-		    || scheme_eq(item, M_execute) || scheme_eq(item, M_delete))
-		raise_vim_exn(_("not allowed in the Vim sandbox"));
-	    requested_access = SCHEME_CDR(requested_access);
-	}
+	MZ_REGISTER_STATIC(M_write);
+	M_write = scheme_intern_symbol("write");
+	MZ_GC_CHECK();
     }
+    if (M_read == NULL)
+    {
+	MZ_REGISTER_STATIC(M_read);
+	M_read = scheme_intern_symbol("read");
+	MZ_GC_CHECK();
+    }
+    if (M_execute == NULL)
+    {
+	MZ_REGISTER_STATIC(M_execute);
+	M_execute = scheme_intern_symbol("execute");
+	MZ_GC_CHECK();
+    }
+    if (M_delete == NULL)
+    {
+	MZ_REGISTER_STATIC(M_delete);
+	M_delete = scheme_intern_symbol("delete");
+	MZ_GC_CHECK();
+    }
+
+    while (!SCHEME_NULLP(requested_access))
+    {
+	Scheme_Object *item = SCHEME_CAR(requested_access);
+	if (scheme_eq(item, M_write) || scheme_eq(item, M_read)
+		|| scheme_eq(item, M_execute) || scheme_eq(item, M_delete))
+	    raise_vim_exn(_("not allowed in the Vim sandbox"));
+	requested_access = SCHEME_CDR(requested_access);
+    }
+
     return scheme_void;
 }
 
diff --git a/src/if_python.c b/src/if_python.c
index 90f75ec..863e931 100644
--- a/src/if_python.c
+++ b/src/if_python.c
@@ -1393,34 +1393,31 @@
     void
 python_buffer_free(buf_T *buf)
 {
-    if (BUF_PYTHON_REF(buf) != NULL)
-    {
-	BufferObject *bp = BUF_PYTHON_REF(buf);
-	bp->buf = INVALID_BUFFER_VALUE;
-	BUF_PYTHON_REF(buf) = NULL;
-    }
+    BufferObject *bp = BUF_PYTHON_REF(buf);
+    if (bp == NULL)
+	return;
+    bp->buf = INVALID_BUFFER_VALUE;
+    BUF_PYTHON_REF(buf) = NULL;
 }
 
     void
 python_window_free(win_T *win)
 {
-    if (WIN_PYTHON_REF(win) != NULL)
-    {
-	WindowObject *wp = WIN_PYTHON_REF(win);
-	wp->win = INVALID_WINDOW_VALUE;
-	WIN_PYTHON_REF(win) = NULL;
-    }
+    WindowObject *wp = WIN_PYTHON_REF(win);
+    if (wp == NULL)
+	return;
+    wp->win = INVALID_WINDOW_VALUE;
+    WIN_PYTHON_REF(win) = NULL;
 }
 
     void
 python_tabpage_free(tabpage_T *tab)
 {
-    if (TAB_PYTHON_REF(tab) != NULL)
-    {
-	TabPageObject *tp = TAB_PYTHON_REF(tab);
-	tp->tab = INVALID_TABPAGE_VALUE;
-	TAB_PYTHON_REF(tab) = NULL;
-    }
+    TabPageObject *tp = TAB_PYTHON_REF(tab);
+    if (tp == NULL)
+	return;
+    tp->tab = INVALID_TABPAGE_VALUE;
+    TAB_PYTHON_REF(tab) = NULL;
 }
 
     static int
diff --git a/src/if_python3.c b/src/if_python3.c
index 30332e1..270e1a9 100644
--- a/src/if_python3.c
+++ b/src/if_python3.c
@@ -1835,34 +1835,31 @@
     void
 python3_buffer_free(buf_T *buf)
 {
-    if (BUF_PYTHON_REF(buf) != NULL)
-    {
-	BufferObject *bp = BUF_PYTHON_REF(buf);
-	bp->buf = INVALID_BUFFER_VALUE;
-	BUF_PYTHON_REF(buf) = NULL;
-    }
+    BufferObject *bp = BUF_PYTHON_REF(buf);
+    if (bp == NULL)
+	return;
+    bp->buf = INVALID_BUFFER_VALUE;
+    BUF_PYTHON_REF(buf) = NULL;
 }
 
     void
 python3_window_free(win_T *win)
 {
-    if (WIN_PYTHON_REF(win) != NULL)
-    {
-	WindowObject *wp = WIN_PYTHON_REF(win);
-	wp->win = INVALID_WINDOW_VALUE;
-	WIN_PYTHON_REF(win) = NULL;
-    }
+    WindowObject *wp = WIN_PYTHON_REF(win);
+    if (wp == NULL)
+	return;
+    wp->win = INVALID_WINDOW_VALUE;
+    WIN_PYTHON_REF(win) = NULL;
 }
 
     void
 python3_tabpage_free(tabpage_T *tab)
 {
-    if (TAB_PYTHON_REF(tab) != NULL)
-    {
-	TabPageObject *tp = TAB_PYTHON_REF(tab);
-	tp->tab = INVALID_TABPAGE_VALUE;
-	TAB_PYTHON_REF(tab) = NULL;
-    }
+    TabPageObject *tp = TAB_PYTHON_REF(tab);
+    if (tp == NULL)
+	return;
+    tp->tab = INVALID_TABPAGE_VALUE;
+    TAB_PYTHON_REF(tab) = NULL;
 }
 
     static PyObject *
diff --git a/src/if_ruby.c b/src/if_ruby.c
index b157bb8..8f9b356 100644
--- a/src/if_ruby.c
+++ b/src/if_ruby.c
@@ -866,44 +866,44 @@
     linenr_T i;
     buf_T   *was_curbuf = curbuf;
 
-    if (ensure_ruby_initialized())
-    {
-	if (u_save(eap->line1 - 1, eap->line2 + 1) != OK)
-	    return;
-	for (i = eap->line1; i <= eap->line2; i++)
-	{
-	    VALUE line;
+    if (!ensure_ruby_initialized())
+	return;
 
-	    if (i > curbuf->b_ml.ml_line_count)
-		break;
-	    line = vim_str2rb_enc_str((char *)ml_get(i));
-	    rb_lastline_set(line);
-	    eval_enc_string_protect((char *) eap->arg, &state);
-	    if (state)
-	    {
-		error_print(state);
-		break;
-	    }
-	    if (was_curbuf != curbuf)
-		break;
-	    line = rb_lastline_get();
-	    if (!NIL_P(line))
-	    {
-		if (TYPE(line) != T_STRING)
-		{
-		    emsg(_(e_dollar_must_be_an_instance_of_string));
-		    return;
-		}
-		ml_replace(i, (char_u *) StringValuePtr(line), 1);
-		changed();
-#ifdef SYNTAX_HL
-		syn_changed(i); // recompute syntax hl. for this line
-#endif
-	    }
+    if (u_save(eap->line1 - 1, eap->line2 + 1) != OK)
+	return;
+    for (i = eap->line1; i <= eap->line2; i++)
+    {
+	VALUE line;
+
+	if (i > curbuf->b_ml.ml_line_count)
+	    break;
+	line = vim_str2rb_enc_str((char *)ml_get(i));
+	rb_lastline_set(line);
+	eval_enc_string_protect((char *) eap->arg, &state);
+	if (state)
+	{
+	    error_print(state);
+	    break;
 	}
-	check_cursor();
-	update_curbuf(UPD_NOT_VALID);
+	if (was_curbuf != curbuf)
+	    break;
+	line = rb_lastline_get();
+	if (!NIL_P(line))
+	{
+	    if (TYPE(line) != T_STRING)
+	    {
+		emsg(_(e_dollar_must_be_an_instance_of_string));
+		return;
+	    }
+	    ml_replace(i, (char_u *) StringValuePtr(line), 1);
+	    changed();
+#ifdef SYNTAX_HL
+	    syn_changed(i); // recompute syntax hl. for this line
+#endif
+	}
     }
+    check_cursor();
+    update_curbuf(UPD_NOT_VALID);
 }
 
     static VALUE
@@ -918,73 +918,74 @@
 {
     int state;
 
-    if (ensure_ruby_initialized())
-    {
-	VALUE file_to_load = rb_str_new2((const char *)eap->arg);
-	rb_protect(rb_load_wrap, file_to_load, &state);
-	if (state)
-	    error_print(state);
-    }
+    if (!ensure_ruby_initialized())
+	return;
+
+    VALUE file_to_load = rb_str_new2((const char *)eap->arg);
+    rb_protect(rb_load_wrap, file_to_load, &state);
+    if (state)
+	error_print(state);
 }
 
     void
 ruby_buffer_free(buf_T *buf)
 {
-    if (buf->b_ruby_ref)
-    {
-	rb_hash_aset(objtbl, rb_obj_id((VALUE) buf->b_ruby_ref), Qnil);
-	RDATA(buf->b_ruby_ref)->data = NULL;
-    }
+    if (buf->b_ruby_ref == NULL)
+	return;
+
+    rb_hash_aset(objtbl, rb_obj_id((VALUE) buf->b_ruby_ref), Qnil);
+    RDATA(buf->b_ruby_ref)->data = NULL;
 }
 
     void
 ruby_window_free(win_T *win)
 {
-    if (win->w_ruby_ref)
-    {
-	rb_hash_aset(objtbl, rb_obj_id((VALUE) win->w_ruby_ref), Qnil);
-	RDATA(win->w_ruby_ref)->data = NULL;
-    }
+    if (win->w_ruby_ref == NULL)
+	return;
+
+    rb_hash_aset(objtbl, rb_obj_id((VALUE) win->w_ruby_ref), Qnil);
+    RDATA(win->w_ruby_ref)->data = NULL;
 }
 
     static int
 ensure_ruby_initialized(void)
 {
-    if (!ruby_initialized)
+    if (ruby_initialized)
+	return ruby_initialized;
+
+#ifdef DYNAMIC_RUBY
+    if (ruby_enabled(TRUE))
+#endif
     {
-#ifdef DYNAMIC_RUBY
-	if (ruby_enabled(TRUE))
-#endif
-	{
 #ifdef MSWIN
-	    // suggested by Ariya Mizutani
-	    int argc = 1;
-	    char *argv[] = {"gvim.exe"};
-	    char **argvp = argv;
-	    ruby_sysinit(&argc, &argvp);
+	// suggested by Ariya Mizutani
+	int argc = 1;
+	char *argv[] = {"gvim.exe"};
+	char **argvp = argv;
+	ruby_sysinit(&argc, &argvp);
 #endif
-	    {
-		ruby_init_stack(ruby_stack_start);
-		ruby_init();
-	    }
-	    {
-		int dummy_argc = 2;
-		char *dummy_argv[] = {"vim-ruby", "-e_=0"};
-		ruby_options(dummy_argc, dummy_argv);
-	    }
-	    ruby_script("vim-ruby");
-	    ruby_io_init();
-	    ruby_vim_init();
-	    ruby_initialized = 1;
-	}
-#ifdef DYNAMIC_RUBY
-	else
 	{
-	    emsg(_(e_sorry_this_command_is_disabled_the_ruby_library_could_not_be_loaded));
-	    return 0;
+	    ruby_init_stack(ruby_stack_start);
+	    ruby_init();
 	}
-#endif
+	{
+	    int dummy_argc = 2;
+	    char *dummy_argv[] = {"vim-ruby", "-e_=0"};
+	    ruby_options(dummy_argc, dummy_argv);
+	}
+	ruby_script("vim-ruby");
+	ruby_io_init();
+	ruby_vim_init();
+	ruby_initialized = 1;
     }
+#ifdef DYNAMIC_RUBY
+    else
+    {
+	emsg(_(e_sorry_this_command_is_disabled_the_ruby_library_could_not_be_loaded));
+	return 0;
+    }
+#endif
+
     return ruby_initialized;
 }
 
diff --git a/src/if_xcmdsrv.c b/src/if_xcmdsrv.c
index 1aa09fd..d940839 100644
--- a/src/if_xcmdsrv.c
+++ b/src/if_xcmdsrv.c
@@ -221,31 +221,32 @@
     char_u	*p = NULL;
 
     res = DoRegisterName(dpy, name);
-    if (res < 0)
+    if (res >= 0)
+	return OK;
+
+    i = 1;
+    do
     {
-	i = 1;
-	do
+	if (res < -1 || i >= 1000)
 	{
-	    if (res < -1 || i >= 1000)
-	    {
-		msg_attr(_("Unable to register a command server name"),
-							      HL_ATTR(HLF_W));
-		return FAIL;
-	    }
-	    if (p == NULL)
-		p = alloc(STRLEN(name) + 10);
-	    if (p == NULL)
-	    {
-		res = -10;
-		continue;
-	    }
-	    sprintf((char *)p, "%s%d", name, i++);
-	    res = DoRegisterName(dpy, p);
+	    msg_attr(_("Unable to register a command server name"),
+		    HL_ATTR(HLF_W));
+	    return FAIL;
 	}
-	while (res < 0)
-	    ;
-	vim_free(p);
+	if (p == NULL)
+	    p = alloc(STRLEN(name) + 10);
+	if (p == NULL)
+	{
+	    res = -10;
+	    continue;
+	}
+	sprintf((char *)p, "%s%d", name, i++);
+	res = DoRegisterName(dpy, p);
     }
+    while (res < 0)
+	;
+    vim_free(p);
+
     return OK;
 }
 
@@ -756,17 +757,17 @@
 	return -1;
 
     length = STRLEN(p_enc) + STRLEN(str) + 14;
-    if ((property = alloc(length + 30)) != NULL)
-    {
-	sprintf((char *)property, "%cn%c-E %s%c-n %s%c-w %x",
-			    0, 0, p_enc, 0, str, 0, (unsigned int)commWindow);
-	// Add length of what "%x" resulted in.
-	length += STRLEN(property + length);
-	res = AppendPropCarefully(dpy, win, commProperty, property, length + 1);
-	vim_free(property);
-	return res;
-    }
-    return -1;
+    if ((property = alloc(length + 30)) == NULL)
+	return -1;
+
+    sprintf((char *)property, "%cn%c-E %s%c-n %s%c-w %x",
+	    0, 0, p_enc, 0, str, 0, (unsigned int)commWindow);
+    // Add length of what "%x" resulted in.
+    length += STRLEN(property + length);
+    res = AppendPropCarefully(dpy, win, commProperty, property, length + 1);
+    vim_free(property);
+
+    return res;
 }
 
     static int
diff --git a/src/indent.c b/src/indent.c
index cbb3f94..477a44d 100644
--- a/src/indent.c
+++ b/src/indent.c
@@ -2188,12 +2188,12 @@
 {
     int amount = get_the_indent();
 
-    if (amount >= 0)
-    {
-	change_indent(INDENT_SET, amount, FALSE, 0, TRUE);
-	if (linewhite(curwin->w_cursor.lnum))
-	    did_ai = TRUE;	// delete the indent if the line stays empty
-    }
+    if (amount < 0)
+	return;
+
+    change_indent(INDENT_SET, amount, FALSE, 0, TRUE);
+    if (linewhite(curwin->w_cursor.lnum))
+	did_ai = TRUE;	// delete the indent if the line stays empty
 }
 
 /*
diff --git a/src/version.c b/src/version.c
index b532948..be6600a 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1183,
+/**/
     1182,
 /**/
     1181,