44198: Add cd_silent option to suppress all cd output

ChangeLog

@@ -1,3 +1,8 @@
+2019-04-12  dana  <dana@dana.is>
+
+	* 44198: Doc/Zsh/options.yo, Src/builtin.c, Src/options.c,
+	Src/zsh.h: Add cd_silent option to suppress all cd output
+
 2019-04-10  Peter Stephenson  <p.stephenson@samsung.com>
 
 	* Eric Freese: 44214: Src/exec.c: <(...) substitutions shouldn't

Doc/Zsh/options.yo

@@ -88,6 +88,21 @@ tt(AUTO_CD) option set) is not a directory, and does not begin with a
 slash, try to expand the expression as if it were preceded by a `tt(~)' (see
 noderef(Filename Expansion)).
 )
+pindex(CD_SILENT)
+pindex(NO_CD_SILENT)
+pindex(CDSILENT)
+pindex(NOCDSILENT)
+cindex(cd, silencing)
+cindex(autocd, silencing)
+item(tt(CD_SILENT))(
+Never print the working directory after a tt(cd) (whether explicit or
+implied with the tt(AUTO_CD) option set). tt(cd) normally prints the
+working directory when the argument given to it was tt(-), a stack entry, or
+the name of a directory found under tt(CDPATH). Note that this is distinct
+from tt(pushd)'s stack-printing behaviour, which is controlled by
+tt(PUSHD_SILENT). This option overrides the printing-related effects of
+tt(POSIX_CD).
+)
 pindex(CHASE_DOTS)
 pindex(NO_CHASE_DOTS)
 pindex(CHASEDOTS)

Src/builtin.c

@@ -720,7 +720,7 @@ bin_set(char *nam, char **args, UNUSED(Options ops), UNUSED(int func))
 /**** directory-handling builtins ****/
 
 /**/
-int doprintdir = 0;		/* set in exec.c (for autocd) */
+int doprintdir = 0;		/* set in exec.c (for autocd, cdpath, etc.) */
 
 /* pwd: display the name of the current directory */
 
@@ -1251,7 +1251,7 @@ cd_new_pwd(int func, LinkNode dir, int quiet)
 	if (func != BIN_CD && isset(INTERACTIVE)) {
             if (unset(PUSHDSILENT) && !quiet)
 	        printdirstack();
-        } else if (doprintdir) {
+	} else if (unset(CDSILENT) && doprintdir) {
 	    fprintdir(pwd, stdout);
 	    putchar('\n');
 	}

Src/options.c

@@ -108,6 +108,7 @@ static struct optname optns[] = {
 {{NULL, "cbases",	      0},			 CBASES},
 {{NULL, "cprecedences",	      OPT_EMULATE|OPT_NONZSH},	 CPRECEDENCES},
 {{NULL, "cdablevars",	      OPT_EMULATE},		 CDABLEVARS},
+{{NULL, "cdsilent",	      0},			 CDSILENT},
 {{NULL, "chasedots",	      OPT_EMULATE},		 CHASEDOTS},
 {{NULL, "chaselinks",	      OPT_EMULATE},		 CHASELINKS},
 {{NULL, "checkjobs",	      OPT_EMULATE|OPT_ZSH},	 CHECKJOBS},

Src/zsh.h

@@ -2348,6 +2348,7 @@ enum {
     CASEMATCH,
     CBASES,
     CDABLEVARS,
+    CDSILENT,
     CHASEDOTS,
     CHASELINKS,
     CHECKJOBS,