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Subject[PATCH 15/16] perf list: Remove blank lines, headers when piping output
Date
From: Arnaldo Carvalho de Melo <acme@redhat.com>

So that one can, for instance, use it with wc -l:

# perf list *:*write* | wc -l
60

Or to look for the "bio" tracepoints, without 'perf list' headers:

# perf list *:*bio* | head
block:block_bio_backmerge [Tracepoint event]
block:block_bio_bounce [Tracepoint event]
block:block_bio_complete [Tracepoint event]
block:block_bio_frontmerge [Tracepoint event]
block:block_bio_queue [Tracepoint event]
block:block_bio_remap [Tracepoint event]
#

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-ts7sc0x8u4io4cifzkup4j44@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/builtin-list.c | 2 +-
tools/perf/util/parse-events.c | 13 +++++++------
tools/perf/util/pmu.c | 2 +-
3 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/tools/perf/builtin-list.c b/tools/perf/builtin-list.c
index af5bd0514108..602414040344 100644
--- a/tools/perf/builtin-list.c
+++ b/tools/perf/builtin-list.c
@@ -36,7 +36,7 @@ int cmd_list(int argc, const char **argv, const char *prefix __maybe_unused)

setup_pager();

- if (!raw_dump)
+ if (!raw_dump && pager_in_use())
printf("\nList of pre-defined events (to be used in -e):\n\n");

if (argc == 0) {
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index c1c64fb647aa..5d0cfce2599b 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -1534,7 +1534,7 @@ restart:
printf(" %-50s [%s]\n", evt_list[evt_i++],
event_type_descriptors[PERF_TYPE_TRACEPOINT]);
}
- if (evt_num)
+ if (evt_num && pager_in_use())
printf("\n");

out_free:
@@ -1690,7 +1690,7 @@ restart:
printf(" %-50s [%s]\n", evt_list[evt_i++],
event_type_descriptors[PERF_TYPE_HW_CACHE]);
}
- if (evt_num)
+ if (evt_num && pager_in_use())
printf("\n");

out_free:
@@ -1763,7 +1763,7 @@ restart:
}
printf(" %-50s [%s]\n", evt_list[evt_i++], event_type_descriptors[type]);
}
- if (evt_num)
+ if (evt_num && pager_in_use())
printf("\n");

out_free:
@@ -1804,13 +1804,14 @@ void print_events(const char *event_glob, bool name_only)
printf(" %-50s [%s]\n",
"cpu/t1=v1[,t2=v2,t3 ...]/modifier",
event_type_descriptors[PERF_TYPE_RAW]);
- printf(" (see 'man perf-list' on how to encode it)\n");
- printf("\n");
+ if (pager_in_use())
+ printf(" (see 'man perf-list' on how to encode it)\n\n");

printf(" %-50s [%s]\n",
"mem:<addr>[/len][:access]",
event_type_descriptors[PERF_TYPE_BREAKPOINT]);
- printf("\n");
+ if (pager_in_use())
+ printf("\n");
}

print_tracepoint_events(NULL, NULL, name_only);
diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index ac42c97be9e4..41a356ba3cfe 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -1026,7 +1026,7 @@ void print_pmu_events(const char *event_glob, bool name_only)
printf(" %-50s [Kernel PMU event]\n", aliases[j]);
printed++;
}
- if (printed)
+ if (printed && pager_in_use())
printf("\n");
out_free:
for (j = 0; j < len; j++)
--
2.1.0


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