make lineno_width() from blame reusable for others

builtin/blame.c has a helper function to compute how many columns
we need to show a line-number, whose implementation is reusable as
a more generic helper function to count the number of columns
necessary to show any cardinal number.

Rename it to decimal_width(), move it to pager.c and export it for
use by future callers.

Signed-off-by: Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/blame.c b/builtin/blame.c
index 5a67c202f06abeaa90a7547d78b536f7f2b9db24..f028e8aec82d0936951418f936123041c3b516ad 100644 (file)
--- a/builtin/blame.c
+++ b/builtin/blame.c
@@ -1828,18 +1828,6 @@ static int read_ancestry(const char *graft_file)
        return 0;
 }
 
-/*
- * How many columns do we need to show line numbers in decimal?
- */
-static int lineno_width(int lines)
-{
-       int i, width;
-
-       for (width = 1, i = 10; i <= lines; width++)
-               i *= 10;
-       return width;
-}
-
 /*
  * How many columns do we need to show line numbers, authors,
  * and filenames?
@@ -1880,9 +1868,9 @@ static void find_alignment(struct scoreboard *sb, int *option)
                if (largest_score < ent_score(sb, e))
                        largest_score = ent_score(sb, e);
        }
-       max_orig_digits = lineno_width(longest_src_lines);
-       max_digits = lineno_width(longest_dst_lines);
-       max_score_digits = lineno_width(largest_score);
+       max_orig_digits = decimal_width(longest_src_lines);
+       max_digits = decimal_width(longest_dst_lines);
+       max_score_digits = decimal_width(largest_score);
 }
 
 /*

diff --git a/cache.h b/cache.h
index 9bd8c2d06c80c958b5f654fe16e7294883e49a30..24732e6caf8ba30b44a5aa5f40eb5756d164daf4 100644 (file)
--- a/cache.h
+++ b/cache.h
@@ -1176,6 +1176,7 @@ extern void setup_pager(void);
 extern const char *pager_program;
 extern int pager_in_use(void);
 extern int pager_use_color;
+extern int decimal_width(int);
 
 extern const char *editor_program;
 extern const char *askpass_program;

diff --git a/pager.c b/pager.c
index 975955ba82a0dbb128d6733090cd74c2b509ea81..96c07babbd7756a59fb5e891bf78f9c4396fed13 100644 (file)
--- a/pager.c
+++ b/pager.c
@@ -110,3 +110,15 @@ int pager_in_use(void)
        env = getenv("GIT_PAGER_IN_USE");
        return env ? git_config_bool("GIT_PAGER_IN_USE", env) : 0;
 }
+
+/*
+ * How many columns do we need to show this number in decimal?
+ */
+int decimal_width(int number)
+{
+       int i, width;
+
+       for (width = 1, i = 10; i <= number; width++)
+               i *= 10;
+       return width;
+}