zsh-workers/9625

Doc/Zsh/options.yo

@@ -305,6 +305,16 @@ In double-quoted strings, it is made impossible to escape `tt($)', `tt(`)'
 or `tt(")' (and `tt(\)' itself no longer needs escaping).
 Command substitutions are only expanded once, and cannot be nested.
 )
+pindex(CSH_NULLCMD)
+vindex(NULLCMD, ignoring)
+vindex(READNULLCMD, ignoring)
+cindex(redirections with no command, csh)
+cindex(csh, redirections with no command)
+item(tt(IGNORE_NULLCMD) <C>)(
+Do not use the values of tt(NULLCMD) and tt(READNULLCMD) 
+when running redirections with no command.  This make 
+such redirections fail (see noderef(Redirection)).
+)
 pindex(CSH_NULL_GLOB)
 cindex(csh, null globbing style)
 cindex(null globbing style, csh)
@@ -533,13 +543,6 @@ of tt(exit) or tt(logout) instead.
 However, ten consecutive EOFs will cause the shell to exit anyway,
 to avoid the shell hanging if its tty goes away.
 )
-pindex(IGNORE_NULLCMD)
-vindex(NULLCMD, ignoring)
-vindex(READNULLCMD, ignoring)
-item(tt(IGNORE_NULLCMD) <C> <K> <S>)(
-The values of tt(NULLCMD) and tt(READNULLCMD) are not used when running
-redirections with no commands (see noderef(Redirection)).
-)
 pindex(INC_APPEND_HISTORY)
 cindex(history, incremental appending to a file)
 item(tt(INC_APPEND_HISTORY))(
@@ -983,15 +986,19 @@ Note that setting or unsetting this option on the command line does not
 necessarily affect the state the option will have while the shell is
 running - that is purely an indicator of whether on not commands are
 em(actually) being read from standard input.
-The value of this option cannot be changed anywhere other than the command line.
+The value of this option cannot be changed anywhere other 
+than the command line.
 )
 pindex(SH_NULLCMD)
+vindex(NULLCMD, ignoring)
+vindex(READNULLCMD, ignoring)
 cindex(sh, redirections with no command)
 cindex(ksh, redirections with no command)
+cindex(redirections with no command, sh)
+cindex(redirections with no command, ksh)
 item(tt(SH_NULLCMD) <K> <S>)(
-If the variable tt(NULLCMD) is unset or if the option tt(IGNORE_NULLCMD) 
+Do not use the values of tt(NULLCMD) and tt(READNULLCMD) 
-is set, this option make redirections with no command have the
+when doing redirections, use `tt(:)' instead (see noderef(Redirection)).
-standard Bourn shell behaviour (see noderef(Redirection)).
 )
 pindex(SH_OPTION_LETTERS)
 cindex(sh, single letter options style)

Doc/Zsh/redirect.yo

@@ -200,29 +200,26 @@ vindex(NULLCMD, use of)
 vindex(READNULLCMD, use of)
 pindex(IGNORE_NULLCMD, use of)
 pindex(SH_NULLCMD, use of)
-If a simple command consists of one or more redirection operators
+When a simple command consists of one or more redirection operators
-and zero or more parameter assignments, but no command name, and the
+and zero or more parameter assignments, but no command name, zsh can
-parameter tt(NULLCMD) is not set, an error is caused.  If the parameter
+behave in several ways.
-tt(NULLCMD) is set, its value will be inserted as a command with the
+
-given redirections.  If both tt(NULLCMD) and tt(READNULLCMD) are set, then
+If the parameter tt(NULLCMD) is not set or the option tt(CSH_NULLCMD) is
-the value of the latter will be used instead of that of the former when the
+set, an error is caused.  This is the bf(csh) behavior and tt(CSH_NULLCMD)
-redirection is an input.  The default for tt(NULLCMD) is `tt(cat)' and for
+is set by default when emulating bf(csh).
-tt(READNULLCMD) is `tt(more)'. Thus
+
+If the option (SH_NULLCMD) is set, the builtin tt(`:') is inserted as a
+command with the given redirections.  This is the default when emulating
+bf(sh) or bf(ksh).
+
+Otherwise, if the parameter tt(NULLCMD) is set, its value will be used as a
+command with the given redirections.  If both tt(NULLCMD) and
+tt(READNULLCMD) are set, then the value of the latter will be used instead
+of that of the former when the redirection is an input.  The default for
+tt(NULLCMD) is `tt(cat)' and for tt(READNULLCMD) is `tt(more)'. Thus
 
 example(< file)
 
 shows the contents of tt(file) on standard output, with paging if that is a
 terminal.  tt(NULLCMD) and tt(READNULLCMD) may refer to shell functions.
 
-The above default behaviour can be affected by the options
-tt(IGNORE_NULLCMD) and tt(SH_NULLCMD).  tt(SH_NULLCMD) forces the Bourne
-shell behaviour when the parameter tt(NULLCMD) is not set (i.e. the
-implicit command used with the redirections is `tt(:)'), while
-tt(IGNORE_NULLCMD) is used to obtain the same behaviour as if tt(NULLCMD)
-was unset.
-
-The standard Bourne shell behaviour is obtained by setting the options
-tt(IGNORE_NULLCMD) and tt(SH_NULLCMD).  This is the default when zsh is
-emulating bf(sh) or bf(ksh).  The tt(csh) behaviour can be obtained by
-setting only tt(IGNORE_NULLCMD), which is the default when emulating
-bf(csh).

Src/exec.c

@@ -1661,13 +1661,12 @@ execcmd(Estate state, int input, int output, int how, int last1)
 		    } else if (varspc) {
 			nullexec = 2;
 			break;
-		    } else if (((!nullcmd || !*nullcmd || opts[IGNORENULLCMD])
+		    } else if (!nullcmd || !*nullcmd || opts[CSHNULLCMD] ||
-				&& !opts[SHNULLCMD]) 
+			       (cflags & BINF_PREFIX)) {
-			       ||(cflags & BINF_PREFIX)) {
 			zerr("redirection with no command", NULL, 0);
 			errflag = lastval = 1;
 			return;
-		    } else if (!nullcmd || !*nullcmd || opts[IGNORENULLCMD]) {
+		    } else if (!nullcmd || !*nullcmd || opts[SHNULLCMD]) {
 			if (!args)
 			    args = newlinklist();
 			addlinknode(args, dupstring(":"));

Src/options.c

@@ -102,6 +102,7 @@ static struct optname optns[] = {
 {NULL, "cshjunkiehistory",    OPT_EMULATE|OPT_CSH,	 CSHJUNKIEHISTORY},
 {NULL, "cshjunkieloops",      OPT_EMULATE|OPT_CSH,	 CSHJUNKIELOOPS},
 {NULL, "cshjunkiequotes",     OPT_EMULATE|OPT_CSH,	 CSHJUNKIEQUOTES},
+{NULL, "cshnullcmd",	      OPT_EMULATE|OPT_CSH,	 CSHNULLCMD},
 {NULL, "cshnullglob",	      OPT_EMULATE|OPT_CSH,	 CSHNULLGLOB},
 {NULL, "equals",	      OPT_EMULATE|OPT_ZSH,	 EQUALS},
 {NULL, "errexit",	      OPT_EMULATE,		 ERREXIT},
@@ -134,7 +135,6 @@ static struct optname optns[] = {
 {NULL, "hup",		      OPT_EMULATE|OPT_ZSH,	 HUP},
 {NULL, "ignorebraces",	      OPT_EMULATE|OPT_SH,	 IGNOREBRACES},
 {NULL, "ignoreeof",	      0,			 IGNOREEOF},
-{NULL, "ignorenullcmd",	      OPT_EMULATE|OPT_NONZSH,	 IGNORENULLCMD},
 {NULL, "incappendhistory",    0,			 INCAPPENDHISTORY},
 {NULL, "interactive",	      OPT_SPECIAL,		 INTERACTIVE},
 {NULL, "interactivecomments", OPT_BOURNE,		 INTERACTIVECOMMENTS},

Src/zsh.h

@@ -1269,6 +1269,7 @@ enum {
     CSHJUNKIEHISTORY,
     CSHJUNKIELOOPS,
     CSHJUNKIEQUOTES,
+    CSHNULLCMD,
     CSHNULLGLOB,
     EQUALS,
     ERREXIT,
@@ -1301,7 +1302,6 @@ enum {
     HUP,
     IGNOREBRACES,
     IGNOREEOF,
-    IGNORENULLCMD,
     INCAPPENDHISTORY,
     INTERACTIVE,
     INTERACTIVECOMMENTS,