Update Gauche keywords

Author: mnacamura

README.md

@@ -92,6 +92,7 @@ in Gauche are not strict (e.g., `1/pi` in `math.const` module).
 
 ### Unreleased
 
+* Add missing keywords for Gauche 0.9.10
 * Support the following SRFIs:
   - SRFI 17
   - SRFI 18

doc/r7rs-syntax.txt

@@ -1,4 +1,4 @@
-*r7rs-syntax.txt*          *vim-r7rs-syntax*           Last Change: 2021-06-30
+*r7rs-syntax.txt*          *vim-r7rs-syntax*           Last Change: 2021-07-04
 
                                                 *r7rs-syntax* *ft-r7rs-syntax*
 
@@ -70,7 +70,8 @@ local one takes precedence.
 ==============================================================================
 CHANGELOG                                              *r7rs-syntax-changelog*
 
-Unreleased             * Support the following SRFIs:
+Unreleased             * Add missing keywords for Gauche 0.9.10
+                       * Support the following SRFIs:
                          - `SRFI 17`
                          - `SRFI 18`
                          - `SRFI 21`

ftplugin/gauche.vim

@@ -1,6 +1,6 @@
 " Vim filetype plugin file
 " Language: Scheme (Gauche)
-" Last Change: 2021-06-27
+" Last Change: 2021-07-04
 " Author: Mitsuhiro Nakamura <m.nacamura@gmail.com>
 " URL: https://github.com/mnacamura/vim-r7rs-syntax
 " License: MIT
@@ -11,6 +11,9 @@ endif
 
 " lispwords {{{
 
+setl lispwords+=$let
+setl lispwords+=$let*
+setl lispwords+=$parameterize
 setl lispwords+=^
 setl lispwords+=add-load-path
 setl lispwords+=and-let1
@@ -31,6 +34,9 @@ setl lispwords+=dolist
 setl lispwords+=dotimes
 setl lispwords+=dynamic-lambda
 setl lispwords+=ecase
+setl lispwords+=either-guard
+setl lispwords+=either-let*
+setl lispwords+=either-let*-values
 setl lispwords+=fluid-let
 setl lispwords+=glet*
 setl lispwords+=glet1
@@ -46,12 +52,15 @@ setl lispwords+=match-let
 setl lispwords+=match-let*
 setl lispwords+=match-let1
 setl lispwords+=match-letrec
+setl lispwords+=maybe-let*
+setl lispwords+=maybe-let*-values
 setl lispwords+=rec
 setl lispwords+=rlet1
 setl lispwords+=rxmatch-case
 setl lispwords+=rxmatch-let
 setl lispwords+=shift
 setl lispwords+=ssax:make-parser
+setl lispwords+=string-append!
 setl lispwords+=syntax-errorf
 setl lispwords+=until
 setl lispwords+=unwind-protect