Add write I/O to file

This is a theorical feature listed in http://st.suckless.org/goals. All the
input/output of the terminal will be written to a file, which can be very
useful for debugging, and also allow interconnect st to other process
through named pipes.
---
 st.1 |    6 ++++++
 st.c |   14 +++++++++++++-
 2 files changed, 19 insertions(+), 1 deletion(-)

1 files changed, 13 insertions, 1 deletions

diff --git a/st.c b/st.c
index bd230a3..fde0493 100644
--- a/st.c
+++ b/st.c
@@ -36,7 +36,7 @@
 
 #define USAGE \
         "st " VERSION " (c) 2010-2012 st engineers\n" \
-        "usage: st [-t title] [-c class] [-w windowid] [-v] [-e command...]\n"
+        "usage: st [-t title] [-c class] [-w windowid] [-v] [-f file] [-e command...]\n"
 
 /* XEMBED messages */
 #define XEMBED_FOCUS_IN  4
@@ -342,7 +342,9 @@ static STREscape strescseq;
 static int cmdfd;
 static pid_t pid;
 static Selection sel;
+static FILE *fileio;
 static char **opt_cmd  = NULL;
+static char *opt_io    = NULL;
 static char *opt_title = NULL;
 static char *opt_embed = NULL;
 static char *opt_class = NULL;
@@ -776,6 +778,10 @@ ttynew(void) {
                 close(s);
                 cmdfd = m;
                 signal(SIGCHLD, sigchld);
+                if (opt_io && !(fileio = fopen(opt_io, "w"))) {
+                        fprintf(stderr, "Error opening %s:%s",
+                                opt_io, strerror(errno));
+                }
         }
 }
 
@@ -1534,6 +1540,9 @@ tputtab(bool forward) {
 void
 tputc(char *c) {
         char ascii = *c;
+
+        if (fileio)
+                putc(ascii, fileio);
         if(term.esc & ESC_START) {
                 if(term.esc & ESC_CSI) {
                         csiescseq.buf[csiescseq.len++] = ascii;
@@ -2269,6 +2278,9 @@ main(int argc, char *argv[]) {
                 case 'w':
                         if(++i < argc) opt_embed = argv[i];
                         break;
+                case 'f':
+                        if (++i < argc) opt_io = argv[i];
+                        break;
                 case 'e':
                         /* eat every remaining arguments */
                         if(++i < argc) opt_cmd = &argv[i];