fix a number of syncase porting bugs

* tekuti/git.scm (with-output-to-blob, with-input-from-blob): Use
  hygienic macros.

* tekuti/match-bind.scm (match-bind): Add a check that the pattern is a
  literal string.

* tekuti/util.scm (match-lines): Fix port from defmacro.

tekuti/git.scm

@@ -334,11 +334,15 @@
 (define (with-output-to-blob* thunk)
   (git-hash-object (with-output-to-string thunk)))
 
-(define-macro (with-output-to-blob . forms)
-  `(,with-output-to-blob* (lambda () ,@forms)))
+(define-syntax with-output-to-blob
+  (syntax-rules ()
+    ((_ f f* ...)
+     (with-output-to-blob* (lambda () f f* ...)))))
 
 (define (with-input-from-blob* sha1 thunk)
   (with-input-from-string (git "show" sha1) thunk))
 
-(define-macro (with-input-from-blob sha1 . forms)
-  `(,with-input-from-blob* ,sha1 (lambda () ,@forms)))
+(define-syntax with-input-from-blob
+  (syntax-rules ()
+    ((_ sha1 f f* ...)
+     (with-input-from-blob* sha1 (lambda () f f* ...)))))

tekuti/match-bind.scm

@@ -113,6 +113,7 @@ Here is a short example:
       ((_ regex str vars consequent)
        #'(match-bind regex str vars consequent (if #f #f)))
       ((_ regex str vars consequent alternate)
+       (string? (syntax->datum #'regex))
        (let ((m #'m))
          (with-syntax ((m m)
                        (((var val) ...)

tekuti/util.scm

@@ -97,13 +97,12 @@
 (define-syntax match-lines
   (syntax-rules ()
     ((_ string pattern bindings expr)
-     (let ((rx (irregex pattern)))
      (fold
       (lambda (line seed)
-          (match-bind rx line bindings
+        (match-bind pattern line bindings
                     (cons expr seed)
                     seed))
-        '() (string-split string #\newline))))))
+      '() (string-split string #\newline)))))
 
 (define (dbg fmt . args)
   (apply format (current-error-port) fmt args))