Add [-w write-file] optionHEADmaster

ksh will write lines to write-file containing information about
the status of the shell:

 after prompt:          empty line
 after command entry:   "cmd" followed by command
 after cwd change:      "cwd" followed by new cwd

fg is handled specially, printing a new "cmd" line with the original
command associated with the job.

1 files changed, 12 insertions, 0 deletions

diff --git a/main.c b/main.c
index 41d4d80..dad50d3 100644
--- a/main.c
+++ b/main.c
@@ -278,6 +278,9 @@ main(int argc, char *argv[])
 	/* Set this before parsing arguments */
 	Flag(FPRIVILEGED) = getuid() != ksheuid || getgid() != getegid();
 
+	/* set before parse_args */
+	writefd = 0;
+
 	/* this to note if monitor is set on command line (see below) */
 	Flag(FMONITOR) = 127;
 	argi = parse_args(argv, OF_CMDLINE, (int *) 0);
@@ -286,6 +289,10 @@ main(int argc, char *argv[])
 		/* NOTREACHED */
 	}
 
+	/* print initial cwd */
+	if (writefd)
+		dprintf(writefd, "cwd%s\n", current_wd);
+
 	if (Flag(FCOMMAND)) {
 		s = pushs(SSTRING, ATEMP);
 		if (!(s->start = s->str = argv[argi++]))
@@ -578,7 +585,12 @@ shell(s, toplevel)
 			set_prompt(PS1, s);
 		}
 
+		if (interactive && writefd)
+			dprintf(writefd, "\n");
 		t = compile(s);
+		if (interactive && writefd && s->start[0] != '\n')
+			dprintf(writefd, "cmd%s", s->start);
+
 		if (t != NULL && t->type == TEOF) {
 			if (wastty && Flag(FIGNOREEOF) && --attempts > 0) {
 				shellf("Use `exit' to leave ksh\n");