[PATCH v3 6/8] fast-import: document C-style escapes for paths

[Thalia Archibald <thalia@archibald.dev>]

Simply saying “C-style” string quoting is imprecise, as only a subset of
C escapes are supported. Document the exact escapes.

Signed-off-by: Thalia Archibald <thalia@archibald.dev>
---
 Documentation/git-fast-import.txt | 12 ++++++++----
 t/t9300-fast-import.sh            | 10 ++++++----
 2 files changed, 14 insertions(+), 8 deletions(-)

diff --git a/Documentation/git-fast-import.txt b/Documentation/git-fast-import.txt
index f26d7a8571..db53b50268 100644
--- a/Documentation/git-fast-import.txt
+++ b/Documentation/git-fast-import.txt
@@ -640,10 +640,14 @@ quote, it must be written as a quoted string. Additionally, the source
 
 A `<path>` can use C-style string quoting; this is accepted in all cases
 and mandatory in the cases where the filename cannot be represented as
-an unquoted string. In C-style quoting, the complete name should be surrounded with
-double quotes, and any `LF`, backslash, or double quote characters
-must be escaped by preceding them with a backslash (e.g.,
-`"path/with\n, \\ and \" in it"`).
+an unquoted string. In C-style quoting, the complete filename is
+surrounded with double quote (`"`) and certain characters must be
+escaped by preceding them with a backslash: `LF` is written as `\n`,
+backslash as `\\`, and double quote as `\"`. Some characters may may
+optionally be written with escape sequences: `\a` for bell, `\b` for
+backspace, `\f` for form feed, `\n` for line feed, `\r` for carriage
+return, `\t` for horizontal tab, and `\v` for vertical tab. Any byte can
+be written with 3-digit octal codes (e.g., `\033`).
 
 A `<path>` must use UNIX-style directory separators (forward slash `/`)
 and must be in canonical form. That is it must not:
diff --git a/t/t9300-fast-import.sh b/t/t9300-fast-import.sh
index 13f98e6688..5cde8f8d01 100755
--- a/t/t9300-fast-import.sh
+++ b/t/t9300-fast-import.sh
@@ -3189,8 +3189,9 @@ test_path_eol_success () {
 	'
 }
 
-test_path_eol_success 'quoted spaces'   '" hello world.c "' ' hello world.c '
-test_path_eol_success 'unquoted spaces' ' hello world.c '   ' hello world.c '
+test_path_eol_success 'quoted spaces'   '" hello world.c "'  ' hello world.c '
+test_path_eol_success 'unquoted spaces' ' hello world.c '    ' hello world.c '
+test_path_eol_success 'octal escapes'   '"\150\151\056\143"' 'hi.c'
 
 #
 # Valid paths before a space: filecopy (source) and filerename (source).
@@ -3256,8 +3257,9 @@ test_path_space_success () {
 	'
 }
 
-test_path_space_success 'quoted spaces'      '" hello world.c "' ' hello world.c '
-test_path_space_success 'no unquoted spaces' 'hello_world.c'     'hello_world.c'
+test_path_space_success 'quoted spaces'      '" hello world.c "'  ' hello world.c '
+test_path_space_success 'no unquoted spaces' 'hello_world.c'      'hello_world.c'
+test_path_space_success 'octal escapes'      '"\150\151\056\143"' 'hi.c'
 
 #
 # Test a single commit change with an invalid path. Run it with all occurrences
-- 
2.44.0