With this option all writes to stderr are redirected to the spesified
FILE (or to stdout on case FILE is '-'). This is immediately useful
in emacs interface as some of its exec intefaces do not provide
separation of stdout and stderr.
---
 notmuch-client.h |  1 +
 notmuch.c        | 31 +++++++++++++++++++++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/notmuch-client.h b/notmuch-client.h
index 45749a6..4a3c7ac 100644
--- a/notmuch-client.h
+++ b/notmuch-client.h
@@ -54,6 +54,7 @@ typedef GMimeCipherContext notmuch_crypto_context_t;
 #include <sys/stat.h>
 #include <sys/time.h>
 #include <unistd.h>
+#include <fcntl.h>
 #include <dirent.h>
 #include <errno.h>
 #include <signal.h>
diff --git a/notmuch.c b/notmuch.c
index f51a84f..77b5282 100644
--- a/notmuch.c
+++ b/notmuch.c
@@ -251,6 +251,31 @@ notmuch_command (notmuch_config_t *config,
     return 0;
 }
 
+static int redirect_stderr (const char * stderr_file)
+{
+    if (strcmp (stderr_file, "-") == 0) {
+	if (dup2 (STDOUT_FILENO, STDERR_FILENO) < 0) {
+	    perror ("dup2");
+	    return 1;
+	}
+    } else {
+	int fd = open (stderr_file, O_WRONLY|O_CREAT|O_APPEND, 0644);
+	if (fd < 0) {
+	    fprintf (stderr, "Error: Cannot redirect stderr to '%s': %s\n",
+		     stderr_file, strerror (errno));
+	    return 1;
+	}
+	if (fd != STDERR_FILENO) {
+	    if (dup2 (fd, STDERR_FILENO) < 0) {
+		perror ("dup2");
+		return 1;
+	    }
+	    close (fd);
+	}
+    }
+    return 0;
+}
+
 int
 main (int argc, char *argv[])
 {
@@ -259,6 +284,7 @@ main (int argc, char *argv[])
     const char *command_name = NULL;
     command_t *command;
     char *config_file_name = NULL;
+    char *stderr_file = NULL;
     notmuch_config_t *config;
     notmuch_bool_t print_help=FALSE, print_version=FALSE;
     int opt_index;
@@ -268,6 +294,7 @@ main (int argc, char *argv[])
 	{ NOTMUCH_OPT_BOOLEAN, &print_help, "help", 'h', 0 },
 	{ NOTMUCH_OPT_BOOLEAN, &print_version, "version", 'v', 0 },
 	{ NOTMUCH_OPT_STRING, &config_file_name, "config", 'c', 0 },
+	{ NOTMUCH_OPT_STRING, &stderr_file, "stderr", '\0', 0 },
 	{ 0, 0, 0, 0, 0 }
     };
 
@@ -287,6 +314,10 @@ main (int argc, char *argv[])
 	return 1;
     }
 
+    if (stderr_file && redirect_stderr (stderr_file) != 0) {
+	/* error already printed */
+	return 1;
+    }
     if (print_help)
 	return notmuch_help_command (NULL, argc - 1, &argv[1]);
 
-- 
1.8.1.4