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From: Nguyen Thai Ngoc Duy <pclouds@gmail.com>
To: "Zbigniew Jędrzejewski-Szmek" <zbyszek@in.waw.pl>
Cc: git@vger.kernel.org, gitster@pobox.com,
	Michael J Gruber <git@drmicha.warpmail.net>
Subject: Re: [PATCH 2/3] help.c: make term_columns() cached and export it
Date: Sat, 11 Feb 2012 11:36:23 +0700	[thread overview]
Message-ID: <CACsJy8AjqqEpJr64DJUqVumw1sB2g3pvuz-g4DxhmS-ZbGhY3w@mail.gmail.com> (raw)
In-Reply-To: <1328891972-23695-3-git-send-email-zbyszek@in.waw.pl>

2012/2/10 Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>:
> Since term_columns() will usually fail, when a pager is installed,
> the cache is primed before the pager is installed. If a pager is not
> installed, then the cache will be set on first use.

Conflict alert. term_columns() is also moved out of help.c in
nd/columns series on pu, commit cb0850f (Save terminal width before
setting up pager - 2012-02-04)

>
> Conforms to The Single UNIX Specification, Version 2
> (http://pubs.opengroup.org/onlinepubs/7908799/xbd/envvar.html#tag_002_003).
>
> Signed-off-by: Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>
> ---
>  help.c  |   37 +++++++++++++++++++++++++++++--------
>  help.h  |    2 ++
>  pager.c |    5 +++++
>  3 files changed, 36 insertions(+), 8 deletions(-)
>
> diff --git a/help.c b/help.c
> index bc15066..5d1cb1d 100644
> --- a/help.c
> +++ b/help.c
> @@ -5,26 +5,47 @@
>  #include "help.h"
>  #include "common-cmds.h"
>
> -/* most GUI terminals set COLUMNS (although some don't export it) */
> -static int term_columns(void)
> +/*
> + * Cache for term_columns() value. Set on first use or when
> + * installing a pager and replacing stdout.
> + */
> +static int term_columns_cache;
> +
> +/*
> + * Return cached value (if set) or $COLUMNS (if set and positive) or
> + * ioctl(1, TIOCGWINSZ).ws_col (if positive) or 80.
> + *
> + * $COLUMNS even if set, is usually not exported, so
> + * the variable can be used to override autodection.
> + */
> +int term_columns(void)
>  {
> -       char *col_string = getenv("COLUMNS");
> +       char *col_string;
>        int n_cols;
>
> -       if (col_string && (n_cols = atoi(col_string)) > 0)
> -               return n_cols;
> +       if (term_columns_cache)
> +               return term_columns_cache;
> +
> +       col_string = getenv("COLUMNS");
> +       if (col_string && (n_cols = atoi(col_string)) > 0) {
> +               term_columns_cache = n_cols;
> +               return term_columns_cache;
> +       }
>
>  #ifdef TIOCGWINSZ
>        {
>                struct winsize ws;
>                if (!ioctl(1, TIOCGWINSZ, &ws)) {
> -                       if (ws.ws_col)
> -                               return ws.ws_col;
> +                       if (ws.ws_col) {
> +                               term_columns_cache = ws.ws_col;
> +                               return term_columns_cache;
> +                       }
>                }
>        }
>  #endif
>
> -       return 80;
> +       term_columns_cache = 80;
> +       return term_columns_cache;
>  }
>
>  void add_cmdname(struct cmdnames *cmds, const char *name, int len)
> diff --git a/help.h b/help.h
> index b6b12d5..880a4b4 100644
> --- a/help.h
> +++ b/help.h
> @@ -29,4 +29,6 @@ extern void list_commands(const char *title,
>                          struct cmdnames *main_cmds,
>                          struct cmdnames *other_cmds);
>
> +extern int term_columns(void);
> +
>  #endif /* HELP_H */
> diff --git a/pager.c b/pager.c
> index 975955b..e7032de 100644
> --- a/pager.c
> +++ b/pager.c
> @@ -1,6 +1,7 @@
>  #include "cache.h"
>  #include "run-command.h"
>  #include "sigchain.h"
> +#include "help.h"
>
>  #ifndef DEFAULT_PAGER
>  #define DEFAULT_PAGER "less"
> @@ -76,6 +77,10 @@ void setup_pager(void)
>        if (!pager)
>                return;
>
> +       /* prime the term_columns() cache before it is too
> +        * late and stdout is replaced */
> +       (void) term_columns();
> +
>        setenv("GIT_PAGER_IN_USE", "true", 1);
>
>        /* spawn the pager */
> --
> 1.7.9.263.g4be11.dirty
>



-- 
Duy

  reply	other threads:[~2012-02-11  4:37 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-02-09 23:58 (unknown), Zbigniew Jędrzejewski-Szmek
2012-02-09 23:58 ` [PATCH 1/4] Move git_version_string to help.c in preparation for diff changes Zbigniew Jędrzejewski-Szmek
2012-02-10  0:46   ` Junio C Hamano
2012-02-09 23:58 ` [PATCH 2/4] help.c: make term_columns() cached and export it Zbigniew Jędrzejewski-Szmek
2012-02-10  0:50   ` Junio C Hamano
2012-02-09 23:58 ` [PATCH 3/4] diff --stat: use the real terminal width Zbigniew Jędrzejewski-Szmek
2012-02-10  0:54   ` Junio C Hamano
2012-02-10  6:15   ` Nguyen Thai Ngoc Duy
2012-02-10 11:25     ` Zbigniew Jędrzejewski-Szmek
2012-02-10 13:00       ` Nguyen Thai Ngoc Duy
2012-02-10 16:39       ` [PATCH 0/3 v2] " Zbigniew Jędrzejewski-Szmek
2012-02-10 16:39         ` [PATCH 1/3] Move git_version_string to help.c before diff changes Zbigniew Jędrzejewski-Szmek
2012-02-10 17:58           ` Junio C Hamano
2012-02-10 16:39         ` [PATCH 2/3] help.c: make term_columns() cached and export it Zbigniew Jędrzejewski-Szmek
2012-02-11  4:36           ` Nguyen Thai Ngoc Duy [this message]
2012-02-11 10:49             ` Zbigniew Jędrzejewski-Szmek
2012-02-12  9:40               ` Junio C Hamano
2012-02-12 14:12                 ` [PATCH 1/2] Save terminal width before setting up pager and export term_columns() Zbigniew Jędrzejewski-Szmek
2012-02-13 23:00                   ` Junio C Hamano
2012-02-14 11:44                   ` Nguyen Thai Ngoc Duy
2012-02-14 11:53                     ` Zbigniew Jędrzejewski-Szmek
2012-02-12 14:16                 ` [PATCH 2/2] Rename lineno_width to decimal_width and export it Zbigniew Jędrzejewski-Szmek
2012-02-13 23:29                   ` Junio C Hamano
2012-02-14 12:24                     ` [PATCH v2] make lineno_width() from blame reusable for others Zbigniew Jędrzejewski-Szmek
2012-02-10 16:39         ` [PATCH 3/3] diff --stat: use the real terminal width Zbigniew Jędrzejewski-Szmek
2012-02-10 18:24         ` [PATCH 0/3 v2] " Junio C Hamano
2012-02-12 14:30           ` [PATCH v3] diff --stat: use the full " Zbigniew Jędrzejewski-Szmek
2012-02-14  1:08             ` Junio C Hamano
2012-02-14 23:45               ` [PATCH 1/3 v4] " Zbigniew Jędrzejewski-Szmek
2012-02-14 23:45                 ` [PATCH 2/3 v4] diff --stat: better alignment for binary files Zbigniew Jędrzejewski-Szmek
2012-02-14 23:45                 ` [PATCH 3/3 v4] Update diff --stat output in tests and tutorial Zbigniew Jędrzejewski-Szmek
2012-02-15  1:21                   ` Junio C Hamano
2012-02-15 11:03                     ` [PATCH 1/3 v5] diff --stat: tests for long filenames and big change counts Zbigniew Jędrzejewski-Szmek
2012-02-15 11:03                       ` [PATCH 2/3 v5] diff --stat: use the full terminal width Zbigniew Jędrzejewski-Szmek
2012-02-15 18:07                         ` Junio C Hamano
2012-02-15 11:03                       ` [PATCH 3/3 v5] diff --stat: use less columns for change counts Zbigniew Jędrzejewski-Szmek
2012-02-15 12:12                         ` Nguyen Thai Ngoc Duy
2012-02-15 17:12                       ` [PATCH 1/3 v5] diff --stat: tests for long filenames and big " Junio C Hamano
2012-02-15 17:33                         ` Junio C Hamano
2012-02-16  9:57                         ` Zbigniew Jędrzejewski-Szmek
2012-02-16 20:01                           ` Junio C Hamano
2012-02-15  0:07                 ` [PATCH 1/3 v4] diff --stat: use the full terminal width Junio C Hamano
2012-02-15  1:18                 ` Junio C Hamano
2012-02-15  7:39                 ` Johannes Sixt
2012-02-09 23:58 ` [PATCH 4/4] diff --stat: use most of the space for file names Zbigniew Jędrzejewski-Szmek
2012-02-10  0:55   ` Junio C Hamano

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