From ad6c3739a33586ba15a8c5c245dcd59e8a31cef1 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= Date: Sun, 12 Feb 2012 15:12:32 +0100 Subject: [PATCH 1/2] pager: find out the terminal width before spawning the pager MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit term_columns() checks for terminal width via ioctl(2) on the standard output, but we spawn the pager too early for this check to be useful. The effect of this buglet can be observed by opening a wide terminal and running "git -p help --all", which still shows 80-column output, while "git help --all" uses the full terminal width. Run the check before we spawn the pager to fix this. While at it, move term_columns() to pager.c and export it from cache.h so that callers other than the help subsystem can use it. Signed-off-by: Zbigniew Jędrzejewski-Szmek Signed-off-by: Junio C Hamano --- cache.h | 1 + help.c | 22 ---------------------- pager.c | 37 +++++++++++++++++++++++++++++++++++++ 3 files changed, 38 insertions(+), 22 deletions(-) diff --git a/cache.h b/cache.h index 79c612fc2..c7e3b4d49 100644 --- a/cache.h +++ b/cache.h @@ -1172,6 +1172,7 @@ extern void setup_pager(void); extern const char *pager_program; extern int pager_in_use(void); extern int pager_use_color; +extern int term_columns(void); extern const char *editor_program; extern const char *askpass_program; diff --git a/help.c b/help.c index cbbe966f6..14eefc91c 100644 --- a/help.c +++ b/help.c @@ -5,28 +5,6 @@ #include "help.h" #include "common-cmds.h" -/* most GUI terminals set COLUMNS (although some don't export it) */ -static int term_columns(void) -{ - char *col_string = getenv("COLUMNS"); - int n_cols; - - if (col_string && (n_cols = atoi(col_string)) > 0) - return n_cols; - -#ifdef TIOCGWINSZ - { - struct winsize ws; - if (!ioctl(1, TIOCGWINSZ, &ws)) { - if (ws.ws_col) - return ws.ws_col; - } - } -#endif - - return 80; -} - void add_cmdname(struct cmdnames *cmds, const char *name, int len) { struct cmdname *ent = xmalloc(sizeof(*ent) + len + 1); diff --git a/pager.c b/pager.c index 975955ba8..b7909678f 100644 --- a/pager.c +++ b/pager.c @@ -76,6 +76,12 @@ void setup_pager(void) if (!pager) return; + /* + * force computing the width of the terminal before we redirect + * the standard output to the pager. + */ + (void) term_columns(); + setenv("GIT_PAGER_IN_USE", "true", 1); /* spawn the pager */ @@ -110,3 +116,34 @@ int pager_in_use(void) env = getenv("GIT_PAGER_IN_USE"); return env ? git_config_bool("GIT_PAGER_IN_USE", env) : 0; } + +/* + * Return cached value (if set) or $COLUMNS environment variable (if + * set and positive) or ioctl(1, TIOCGWINSZ).ws_col (if positive), + * and default to 80 if all else fails. + */ +int term_columns(void) +{ + static int term_columns_at_startup; + + char *col_string; + int n_cols; + + if (term_columns_at_startup) + return term_columns_at_startup; + + term_columns_at_startup = 80; + + col_string = getenv("COLUMNS"); + if (col_string && (n_cols = atoi(col_string)) > 0) + term_columns_at_startup = n_cols; +#ifdef TIOCGWINSZ + else { + struct winsize ws; + if (!ioctl(1, TIOCGWINSZ, &ws) && ws.ws_col) + term_columns_at_startup = ws.ws_col; + } +#endif + + return term_columns_at_startup; +} From 2eeeef24ff5a6538f41f5fe44f3a4e7f6e36e7e5 Mon Sep 17 00:00:00 2001 From: Junio C Hamano Date: Tue, 14 Feb 2012 13:49:11 -0800 Subject: [PATCH 2/2] diff --stat: show bars of same length for paths with same amount of changes When commit 3ed74e6 (diff --stat: ensure at least one '-' for deletions, and one '+' for additions, 2006-09-28) improved the output for files with tiny modifications, we accidentally broke the logic to ensure that two equal sized changes are shown with the bars of the same length, even when rounding errors exist. Compute the length of the graph bars, using the same "non-zero changes is shown with at least one column" scaling logic, but by scaling the sum of additions and deletions to come up with the total length of the bar (this ensures that two equal sized changes result in bars of the same length), and then scaling the smaller of the additions or deletions. The other side is computed as the difference between the two. This makes the apportioning between additions and deletions less accurate due to rounding errors, but it is much less noticeable than two files with the same amount of change showing bars of different length. Signed-off-by: Junio C Hamano --- diff.c | 27 ++++++++++++++++++++------- 1 file changed, 20 insertions(+), 7 deletions(-) diff --git a/diff.c b/diff.c index 374ecf3b4..74db18846 100644 --- a/diff.c +++ b/diff.c @@ -1267,13 +1267,15 @@ const char mime_boundary_leader[] = "------------"; static int scale_linear(int it, int width, int max_change) { + if (!it) + return 0; /* - * make sure that at least one '-' is printed if there were deletions, - * and likewise for '+'. + * make sure that at least one '-' or '+' is printed if + * there is any change to this path. The easiest way is to + * scale linearly as if the alloted width is one column shorter + * than it is, and then add 1 to the result. */ - if (max_change < 2) - return it; - return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1); + return 1 + (it * (width - 1) / max_change); } static void show_name(FILE *file, @@ -1440,8 +1442,19 @@ static void show_stats(struct diffstat_t *data, struct diff_options *options) dels += del; if (width <= max_change) { - add = scale_linear(add, width, max_change); - del = scale_linear(del, width, max_change); + int total = add + del; + + total = scale_linear(add + del, width, max_change); + if (total < 2 && add && del) + /* width >= 2 due to the sanity check */ + total = 2; + if (add < del) { + add = scale_linear(add, width, max_change); + del = total - add; + } else { + del = scale_linear(del, width, max_change); + add = total - del; + } } fprintf(options->file, "%s", line_prefix); show_name(options->file, prefix, name, len);