This is more consistent with the project style. The majority of Git's
source files use dashes in preference to underscores in their file names.

Also adjust contrib/update-unicode as well.

Signed-off-by: Stefan Beller <>
 contrib/update-unicode/README            | 6 +++---
 contrib/update-unicode/ | 2 +-
 unicode_width.h => unicode-width.h       | 0
 utf8.c                                   | 2 +-
 4 files changed, 5 insertions(+), 5 deletions(-)
 rename unicode_width.h => unicode-width.h (100%)

diff --git a/contrib/update-unicode/README b/contrib/update-unicode/README
index b9e2fc8540..151a197041 100644
--- a/contrib/update-unicode/README
+++ b/contrib/update-unicode/README
@@ -1,10 +1,10 @@
 TL;DR: Run after the publication of a new Unicode
-standard and commit the resulting unicode_widths.h file.
+standard and commit the resulting unicode-widths.h file.
 The long version
-The Git source code ships the file unicode_widths.h which contains
+The Git source code ships the file unicode-widths.h which contains
 tables of zero and double width Unicode code points, respectively.
 These tables are generated using in this directory. itself uses a third-party tool, uniset, to query two
@@ -16,5 +16,5 @@ This requires a current-ish version of autoconf (2.69 works 
per December
 On each run, checks whether more recent Unicode data
 files are available from the Unicode consortium, and rebuilds the header
-unicode_widths.h with the new data. The new header can then be
+unicode-widths.h with the new data. The new header can then be
diff --git a/contrib/update-unicode/ 
index e05db92d3f..aa90865bef 100755
--- a/contrib/update-unicode/
+++ b/contrib/update-unicode/
@@ -6,7 +6,7 @@
 #Cf Format          a format control character
 cd "$(dirname "$0")"
-UNICODEWIDTH_H=$(git rev-parse --show-toplevel)/unicode_width.h
+UNICODEWIDTH_H=$(git rev-parse --show-toplevel)/unicode-width.h
 wget -N \ &&
diff --git a/unicode_width.h b/unicode-width.h
similarity index 100%
rename from unicode_width.h
rename to unicode-width.h
diff --git a/utf8.c b/utf8.c
index 2c27ce0137..4419055b48 100644
--- a/utf8.c
+++ b/utf8.c
@@ -81,7 +81,7 @@ static int git_wcwidth(ucs_char_t ch)
         * Sorted list of non-overlapping intervals of non-spacing characters,
-#include "unicode_width.h"
+#include "unicode-width.h"
        /* test for 8-bit control characters */
        if (ch == 0)

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