wordsplit: implement separate single- and double-quote parsing.

* include/mailutils/wordsplit.h (MU_WRDSF_SQUOTE,MU_WRDSF_DQUOTE): New flags.
(MU_WRDSF_QUOTE): Redefine as an OR of the above two.
* libmailutils/string/wordsplit.c (scan_word): Treat '\'' and '"'
separately, depending on the flags.
* libmailutils/tests/wsp.c: Add squote and dquote options.
* libmailutils/tests/wordsplit.at: Test separate quoting support.

@@ -46,73 +46,79 @@ struct mu_wordsplit
   struct mu_wordsplit_node *ws_head, *ws_tail;
 };
 
+/* Wordsplit flags.  Only 3 bits of a 32-bit word remain unused.
+   It is getting crowded... */
 /* Append the words found to the array resulting from a previous
    call. */
-#define MU_WRDSF_APPEND            0x0000001
+#define MU_WRDSF_APPEND            0x00000001
 /* Insert we_offs initial NULLs in the array ws_wordv.
    (These are not counted in the returned ws_wordc.) */
-#define MU_WRDSF_DOOFFS            0x0000002
+#define MU_WRDSF_DOOFFS            0x00000002
 /* Don't do command substitution. Reserved for future use. */
-#define MU_WRDSF_NOCMD             0x0000004
+#define MU_WRDSF_NOCMD             0x00000004
 /* The parameter p resulted from a previous call to
    mu_wordsplit(), and mu_wordsplit_free() was not called. Reuse the
    allocated storage. */
-#define MU_WRDSF_REUSE             0x0000008
+#define MU_WRDSF_REUSE             0x00000008
 /* Print errors */
-#define MU_WRDSF_SHOWERR           0x0000010
+#define MU_WRDSF_SHOWERR           0x00000010
 /* Consider it an error if an undefined shell variable
    is expanded. */
-#define MU_WRDSF_UNDEF             0x0000020
+#define MU_WRDSF_UNDEF             0x00000020
 
 /* Don't do variable expansion. */
-#define MU_WRDSF_NOVAR             0x0000040
+#define MU_WRDSF_NOVAR             0x00000040
 /* Abort on ENOMEM error */
-#define MU_WRDSF_ENOMEMABRT        0x0000080
+#define MU_WRDSF_ENOMEMABRT        0x00000080
 /* Trim off any leading and trailind whitespace */
-#define MU_WRDSF_WS                0x0000100
+#define MU_WRDSF_WS                0x00000100
+/* Handle single quotes */
+#define MU_WRDSF_SQUOTE            0x00000200
+/* Handle double quotes */
+#define MU_WRDSF_DQUOTE            0x00000400
 /* Handle quotes and escape directives */
-#define MU_WRDSF_QUOTE             0x0000200
+#define MU_WRDSF_QUOTE             (MU_WRDSF_SQUOTE|MU_WRDSF_DQUOTE)
 /* Replace each input sequence of repeated delimiters with a single
    delimiter */
-#define MU_WRDSF_SQUEEZE_DELIMS    0x0000400
+#define MU_WRDSF_SQUEEZE_DELIMS    0x00000800
 /* Return delimiters */
-#define MU_WRDSF_RETURN_DELIMS     0x0000800
+#define MU_WRDSF_RETURN_DELIMS     0x00001000
 /* Treat sed expressions as words */
-#define MU_WRDSF_SED_EXPR          0x0001000
+#define MU_WRDSF_SED_EXPR          0x00002000
 /* ws_delim field is initialized */
-#define MU_WRDSF_DELIM             0x0002000
+#define MU_WRDSF_DELIM             0x00004000
 /* ws_comment field is initialized */
-#define MU_WRDSF_COMMENT           0x0004000
+#define MU_WRDSF_COMMENT           0x00008000
 /* ws_alloc_die field is initialized */
-#define MU_WRDSF_ALLOC_DIE         0x0008000
+#define MU_WRDSF_ALLOC_DIE         0x00010000
 /* ws_error field is initialized */
-#define MU_WRDSF_ERROR             0x0010000
+#define MU_WRDSF_ERROR             0x00020000
 /* ws_debug field is initialized */
-#define MU_WRDSF_DEBUG             0x0020000
+#define MU_WRDSF_DEBUG             0x00040000
 /* ws_env field is initialized */
-#define MU_WRDSF_ENV               0x0040000
+#define MU_WRDSF_ENV               0x00080000
 /* ws_getvar field is initialized */
-#define MU_WRDSF_GETVAR            0x0080000
+#define MU_WRDSF_GETVAR            0x00100000
 /* enable debugging */
-#define MU_WRDSF_SHOWDBG           0x0100000
+#define MU_WRDSF_SHOWDBG           0x00200000
 /* Don't split input into words.  Useful for side effects. */
-#define MU_WRDSF_NOSPLIT           0x0200000
+#define MU_WRDSF_NOSPLIT           0x00400000
 /* Keep undefined variables in place, instead of expanding them to
    empty string */
-#define MU_WRDSF_KEEPUNDEF         0x0400000
+#define MU_WRDSF_KEEPUNDEF         0x00800000
 /* Warn about undefined variables */
-#define MU_WRDSF_WARNUNDEF         0x0800000
+#define MU_WRDSF_WARNUNDEF         0x01000000
 /* Handle C escapes */
-#define MU_WRDSF_CESCAPES          0x1000000
+#define MU_WRDSF_CESCAPES          0x02000000
 
 /* ws_closure is set */
-#define MU_WRDSF_CLOSURE           0x2000000
+#define MU_WRDSF_CLOSURE           0x04000000
 /* ws_env is a Key/Value environment, i.e. the value of a variable is
    stored in the element that follows its name. */
-#define MU_WRDSF_ENV_KV            0x4000000
+#define MU_WRDSF_ENV_KV            0x08000000
 
 /* ws_escape is set */
-#define MU_WRDSF_ESCAPE            0x8000000
+#define MU_WRDSF_ESCAPE            0x10000000
 
 #define MU_WRDSF_DEFFLAGS	       \
   (MU_WRDSF_NOVAR | MU_WRDSF_NOCMD | \

@@ -1115,7 +1115,8 @@ scan_word (struct mu_wordsplit *wsp, size_t start)
 		  continue;
 		}
 
-	      if (command[i] == '\'' || command[i] == '"')
+	      if (((wsp->ws_flags & MU_WRDSF_SQUOTE) && command[i] == '\'') ||
+		  ((wsp->ws_flags & MU_WRDSF_DQUOTE) && command[i] == '"'))
 		{
 		  if (join && wsp->ws_tail)
 		    wsp->ws_tail->flags |= _WSNF_JOIN;

@@ -355,4 +355,22 @@ TESTWSP([unescape],[],[-default novar nocmd quote escape '\"'],
 2: "bs \\"
 ])
 
+TESTWSP([dquote],[],[-default novar nocmd dquote],
+[a "quoted example" isn't it],
+[NF: 4
+0: a
+1: "quoted example"
+2: isn't
+3: it
+])
+
+TESTWSP([squote],[],[-default novar nocmd squote],
+[a 'quoted example' isn"t it],
+[NF: 4
+0: a
+1: "quoted example"
+2: "isn\"t"
+3: it
+])
+
 m4_popdef([TESTWSP])

@@ -37,6 +37,8 @@ struct mu_kwd bool_keytab[] = {
   { "nocmd",  MU_WRDSF_NOCMD },
   { "ws",     MU_WRDSF_WS },
   { "quote",  MU_WRDSF_QUOTE },
+  { "squote", MU_WRDSF_SQUOTE },
+  { "dquote", MU_WRDSF_DQUOTE },
   { "squeeze_delims", MU_WRDSF_SQUEEZE_DELIMS },
   { "return_delims",  MU_WRDSF_RETURN_DELIMS },
   { "sed",     MU_WRDSF_SED_EXPR },