trace2: cleanup column alignment in perf target format

Truncate/elide very long "filename:linenumber" field.
Truncate region and data "category" field if necessary.
Adjust overall column widths.

Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/trace2/tr2_tgt_perf.c b/trace2/tr2_tgt_perf.c
index ea0cbbe13ee06629b2619704a4f9ae6714dc1b7d..4a9d99218bf1be3f87fed728bd2301a7c2002575 100644 (file)
--- a/trace2/tr2_tgt_perf.c
+++ b/trace2/tr2_tgt_perf.c
@@ -21,10 +21,10 @@ static struct tr2_dst tr2dst_perf = { TR2_SYSENV_PERF, 0, 0, 0 };
  */
 static int tr2env_perf_be_brief;
 
-#define TR2FMT_PERF_FL_WIDTH (50)
+#define TR2FMT_PERF_FL_WIDTH (28)
 #define TR2FMT_PERF_MAX_EVENT_NAME (12)
-#define TR2FMT_PERF_REPO_WIDTH (4)
-#define TR2FMT_PERF_CATEGORY_WIDTH (10)
+#define TR2FMT_PERF_REPO_WIDTH (3)
+#define TR2FMT_PERF_CATEGORY_WIDTH (12)
 
 #define TR2_DOTS_BUFFER_SIZE (100)
 #define TR2_INDENT (2)
@@ -79,17 +79,36 @@ static void perf_fmt_prepare(const char *event_name,
 
        if (!tr2env_perf_be_brief) {
                struct tr2_tbuf tb_now;
+               size_t fl_end_col;
 
                tr2_tbuf_local_time(&tb_now);
                strbuf_addstr(buf, tb_now.buf);
                strbuf_addch(buf, ' ');
 
-               if (file && *file)
-                       strbuf_addf(buf, "%s:%d ", file, line);
-               while (buf->len < TR2FMT_PERF_FL_WIDTH)
+               fl_end_col = buf->len + TR2FMT_PERF_FL_WIDTH;
+
+               if (file && *file) {
+                       struct strbuf buf_fl = STRBUF_INIT;
+
+                       strbuf_addf(&buf_fl, "%s:%d", file, line);
+
+                       if (buf_fl.len <= TR2FMT_PERF_FL_WIDTH)
+                               strbuf_addbuf(buf, &buf_fl);
+                       else {
+                               size_t avail = TR2FMT_PERF_FL_WIDTH - 3;
+                               strbuf_addstr(buf, "...");
+                               strbuf_add(buf,
+                                          &buf_fl.buf[buf_fl.len - avail],
+                                          avail);
+                       }
+
+                       strbuf_release(&buf_fl);
+               }
+
+               while (buf->len < fl_end_col)
                        strbuf_addch(buf, ' ');
 
-               strbuf_addstr(buf, "| ");
+               strbuf_addstr(buf, " | ");
        }
 
        strbuf_addf(buf, "d%d | ", tr2_sid_depth());
@@ -102,7 +121,7 @@ static void perf_fmt_prepare(const char *event_name,
                strbuf_addf(buf, "r%d ", repo->trace2_repo_id);
        while (buf->len < len)
                strbuf_addch(buf, ' ');
-       strbuf_addstr(buf, "| ");
+       strbuf_addstr(buf, " | ");
 
        if (p_us_elapsed_absolute)
                strbuf_addf(buf, "%9.6f | ",
@@ -116,8 +135,8 @@ static void perf_fmt_prepare(const char *event_name,
        else
                strbuf_addf(buf, "%9s | ", " ");
 
-       strbuf_addf(buf, "%-*s | ", TR2FMT_PERF_CATEGORY_WIDTH,
-                   (category ? category : ""));
+       strbuf_addf(buf, "%-*.*s | ", TR2FMT_PERF_CATEGORY_WIDTH,
+                   TR2FMT_PERF_CATEGORY_WIDTH, (category ? category : ""));
 
        if (ctx->nr_open_regions > 0) {
                int len_indent = TR2_INDENT_LENGTH(ctx);