cgtop: add --version option

[elogind.git] / src / journal / journalctl.c

diff --git a/src/journal/journalctl.c b/src/journal/journalctl.c
index 0d37107874f262f41b128e48a04e689a4fb8d431..abcfabe75d4e56d02b7f2d1b1a72c85081195638 100644 (file)
--- a/src/journal/journalctl.c
+++ b/src/journal/journalctl.c
@@ -198,6 +198,21 @@ static int parse_argv(int argc, char *argv[]) {
         return 1;
 }
 
+static bool on_tty(void) {
+        static int t = -1;
+
+        /* Note that this is invoked relatively early, before we start
+         * the pager. That means the value we return reflects whether
+         * we originally were started on a tty, not if we currently
+         * are. But this is intended, since we want colour and so on
+         * when run in our own pager. */
+
+        if (_unlikely_(t < 0))
+                t = isatty(STDOUT_FILENO) > 0;
+
+        return t;
+}
+
 static int generate_new_id128(void) {
         sd_id128_t id;
         int r;
@@ -256,8 +271,7 @@ static int add_matches(sd_journal *j, char **args) {
                                 t = strappend("_EXE=", path);
                                 if (!t) {
                                         free(p);
-                                        log_error("Out of memory");
-                                        return -ENOMEM;
+                                        return log_oom();
                                 }
 
                                 r = sd_journal_add_match(j, t, 0);
@@ -312,6 +326,7 @@ int main(int argc, char *argv[]) {
         bool need_seek = false;
         sd_id128_t previous_boot_id;
         bool previous_boot_id_valid = false;
+        bool have_pager;
 
         log_parse_environment();
         log_open();
@@ -397,10 +412,8 @@ int main(int argc, char *argv[]) {
                 goto finish;
         }
 
-        if (!arg_no_pager && !arg_follow) {
-                columns();
-                pager_open();
-        }
+        on_tty();
+        have_pager = !arg_no_pager && !arg_follow && pager_open();
 
         if (arg_output == OUTPUT_JSON) {
                 fputc('[', stdout);
@@ -410,6 +423,10 @@ int main(int argc, char *argv[]) {
         for (;;) {
                 for (;;) {
                         sd_id128_t boot_id;
+                        int flags =
+                                arg_show_all * OUTPUT_SHOW_ALL |
+                                have_pager * OUTPUT_FULL_WIDTH |
+                                on_tty() * OUTPUT_COLOR;
 
                         if (need_seek) {
                                 r = sd_journal_next(j);
@@ -434,7 +451,7 @@ int main(int argc, char *argv[]) {
 
                         line ++;
 
-                        r = output_journal(j, arg_output, line, 0, arg_show_all);
+                        r = output_journal(j, arg_output, line, 0, flags);
                         if (r < 0)
                                 goto finish;