Re: [PATCH v4 07/15] perf tools report: Use less for scripts output

[Arnaldo Carvalho de Melo]

Em Tue, Mar 05, 2019 at 06:47:50AM -0800, Andi Kleen escreveu:
> From: Andi Kleen <ak@xxxxxxxxxxxxxxx>
> 
> The UI viewer for scripts output has a lot of limitations: limited size,
> no search or save function, slow, and various other issues.
> 
> Just use 'less' to display directly on the terminal instead.

I'm ok with this, CCing Feng tho since he contributed this browser, to
let him know.

- Arnaldo
 
> This won't work in gtk mode, but gtk doesn't support these
> context menus anyways. If that is ever done could use an terminal
> for the output.
> 
> Signed-off-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
> 
> ---
> 
> v2:
> Remove some unneeded headers
> ---
>  tools/perf/ui/browsers/scripts.c | 130 ++++---------------------------
>  1 file changed, 17 insertions(+), 113 deletions(-)
> 
> diff --git a/tools/perf/ui/browsers/scripts.c b/tools/perf/ui/browsers/scripts.c
> index 90a32ac69e76..7f36630694bf 100644
> --- a/tools/perf/ui/browsers/scripts.c
> +++ b/tools/perf/ui/browsers/scripts.c
> @@ -1,35 +1,12 @@
>  // SPDX-License-Identifier: GPL-2.0
> -#include <elf.h>
> -#include <inttypes.h>
> -#include <sys/ttydefaults.h>
> -#include <string.h>
>  #include "../../util/sort.h"
>  #include "../../util/util.h"
>  #include "../../util/hist.h"
>  #include "../../util/debug.h"
>  #include "../../util/symbol.h"
>  #include "../browser.h"
> -#include "../helpline.h"
>  #include "../libslang.h"
>  
> -/* 2048 lines should be enough for a script output */
> -#define MAX_LINES		2048
> -
> -/* 160 bytes for one output line */
> -#define AVERAGE_LINE_LEN	160
> -
> -struct script_line {
> -	struct list_head node;
> -	char line[AVERAGE_LINE_LEN];
> -};
> -
> -struct perf_script_browser {
> -	struct ui_browser b;
> -	struct list_head entries;
> -	const char *script_name;
> -	int nr_lines;
> -};
> -
>  #define SCRIPT_NAMELEN	128
>  #define SCRIPT_MAX_NO	64
>  /*
> @@ -73,69 +50,29 @@ static int list_scripts(char *script_name)
>  	return ret;
>  }
>  
> -static void script_browser__write(struct ui_browser *browser,
> -				   void *entry, int row)
> +static void run_script(char *cmd)
>  {
> -	struct script_line *sline = list_entry(entry, struct script_line, node);
> -	bool current_entry = ui_browser__is_current_entry(browser, row);
> -
> -	ui_browser__set_color(browser, current_entry ? HE_COLORSET_SELECTED :
> -						       HE_COLORSET_NORMAL);
> -
> -	ui_browser__write_nstring(browser, sline->line, browser->width);
> +	pr_debug("Running %s\n", cmd);
> +	SLang_reset_tty();
> +	if (system(cmd) < 0)
> +		pr_warning("Cannot run %s\n", cmd);
> +	/*
> +	 * SLang doesn't seem to reset the whole terminal, so be more
> +	 * forceful to get back to the original state.
> +	 */
> +	printf("\033[c\033[H\033[J");
> +	fflush(stdout);
> +	SLang_init_tty(0, 0, 0);
> +	SLsmg_refresh();
>  }
>  
> -static int script_browser__run(struct perf_script_browser *browser)
> -{
> -	int key;
> -
> -	if (ui_browser__show(&browser->b, browser->script_name,
> -			     "Press ESC to exit") < 0)
> -		return -1;
> -
> -	while (1) {
> -		key = ui_browser__run(&browser->b, 0);
> -
> -		/* We can add some special key handling here if needed */
> -		break;
> -	}
> -
> -	ui_browser__hide(&browser->b);
> -	return key;
> -}
> -
> -
>  int script_browse(const char *script_opt)
>  {
>  	char cmd[SCRIPT_FULLPATH_LEN*2], script_name[SCRIPT_FULLPATH_LEN];
> -	char *line = NULL;
> -	size_t len = 0;
> -	ssize_t retlen;
> -	int ret = -1, nr_entries = 0;
> -	FILE *fp;
> -	void *buf;
> -	struct script_line *sline;
> -
> -	struct perf_script_browser script = {
> -		.b = {
> -			.refresh    = ui_browser__list_head_refresh,
> -			.seek	    = ui_browser__list_head_seek,
> -			.write	    = script_browser__write,
> -		},
> -		.script_name = script_name,
> -	};
> -
> -	INIT_LIST_HEAD(&script.entries);
> -
> -	/* Save each line of the output in one struct script_line object. */
> -	buf = zalloc((sizeof(*sline)) * MAX_LINES);
> -	if (!buf)
> -		return -1;
> -	sline = buf;
>  
>  	memset(script_name, 0, SCRIPT_FULLPATH_LEN);
>  	if (list_scripts(script_name))
> -		goto exit;
> +		return -1;
>  
>  	sprintf(cmd, "perf script -s %s ", script_name);
>  
> @@ -147,42 +84,9 @@ int script_browse(const char *script_opt)
>  		strcat(cmd, input_name);
>  	}
>  
> -	strcat(cmd, " 2>&1");
> -
> -	fp = popen(cmd, "r");
> -	if (!fp)
> -		goto exit;
> -
> -	while ((retlen = getline(&line, &len, fp)) != -1) {
> -		strncpy(sline->line, line, AVERAGE_LINE_LEN);
> -
> -		/* If one output line is very large, just cut it short */
> -		if (retlen >= AVERAGE_LINE_LEN) {
> -			sline->line[AVERAGE_LINE_LEN - 1] = '\0';
> -			sline->line[AVERAGE_LINE_LEN - 2] = '\n';
> -		}
> -		list_add_tail(&sline->node, &script.entries);
> -
> -		if (script.b.width < retlen)
> -			script.b.width = retlen;
> -
> -		if (nr_entries++ >= MAX_LINES - 1)
> -			break;
> -		sline++;
> -	}
> -
> -	if (script.b.width > AVERAGE_LINE_LEN)
> -		script.b.width = AVERAGE_LINE_LEN;
> -
> -	free(line);
> -	pclose(fp);
> +	strcat(cmd, " 2>&1 | less");
>  
> -	script.nr_lines = nr_entries;
> -	script.b.nr_entries = nr_entries;
> -	script.b.entries = &script.entries;
> +	run_script(cmd);
>  
> -	ret = script_browser__run(&script);
> -exit:
> -	free(buf);
> -	return ret;
> +	return 0;
>  }
> -- 
> 2.20.1

-- 

- Arnaldo