Use raw literals for more strings with backslashes

This builds on 025e788 (GitoxideLabs#1528) and 6daaba3 (GitoxideLabs#1844), using `r` and
`br` string literals in more places where it helps use fewer
backslashes, where doing so seems to improve readability.

Author: EliahKagan

build.rs

@@ -2,7 +2,7 @@ use std::process::Command;
 
 fn main() {
     let version = Command::new(if cfg!(windows) { "git.exe" } else { "git" })
-        .args(["describe", "--match=v*\\.*\\.*"])
+        .args(["describe", r"--match=v*\.*\.*"])
         .output()
         .ok()
         .and_then(|out| parse_describe(&out.stdout))

gix-actor/src/signature/mod.rs

@@ -82,7 +82,7 @@ pub(crate) mod write {
     #[derive(Debug, thiserror::Error)]
     #[allow(missing_docs)]
     pub(crate) enum Error {
-        #[error("Signature name or email must not contain '<', '>' or \\n")]
+        #[error(r"Signature name or email must not contain '<', '>' or \n")]
         IllegalCharacter,
     }
 

gix-actor/tests/identity/mod.rs

@@ -34,7 +34,7 @@ fn lenient_parsing() -> gix_testtools::Result {
         let err = signature.write_to(&mut output).unwrap_err();
         assert_eq!(
             err.to_string(),
-            "Signature name or email must not contain '<', '>' or \\n",
+            r"Signature name or email must not contain '<', '>' or \n",
             "this isn't roundtrippable as the name is technically incorrect - must not contain brackets"
         );
     }

gix-attributes/src/parse.rs

@@ -20,7 +20,7 @@ mod error {
     #[derive(thiserror::Error, Debug)]
     #[allow(missing_docs)]
     pub enum Error {
-        #[error("Line {line_number} has a negative pattern, for literal characters use \\!: {line}")]
+        #[error(r"Line {line_number} has a negative pattern, for literal characters use \!: {line}")]
         PatternNegation { line_number: usize, line: BString },
         #[error("Attribute in line {line_number} has non-ascii characters or starts with '-': {attribute}")]
         AttributeName { line_number: usize, attribute: BString },

gix-command/src/lib.rs

@@ -290,10 +290,10 @@ mod prepare {
                                         prep.command = gix_path::from_bstring(gix_quote::single(command)).into();
                                     }
                                 }
-                                prep.command.push(" \"$@\"");
+                                prep.command.push(r#" "$@""#);
                             } else {
                                 gix_trace::debug!(
-                                    "Will not add '\"$@\"' to '{:?}' as it seems to contain '$@' already",
+                                    r#"Will not add '"$@"' to '{:?}' as it seems to contain '$@' already"#,
                                     prep.command
                                 );
                             }
@@ -434,7 +434,7 @@ pub mod shebang {
         let mut line = buf.lines().next()?;
         line = line.strip_prefix(b"#!")?;
 
-        let slash_idx = line.rfind_byteset(b"/\\")?;
+        let slash_idx = line.rfind_byteset(br"/\")?;
         Some(match line[slash_idx..].find_byte(b' ') {
             Some(space_idx) => {
                 let space = slash_idx + space_idx;

gix-command/tests/command.rs

@@ -52,13 +52,13 @@ mod shebang {
                 "trimming works for tabs as well"
             );
             assert_eq!(
-                parse("#!\\bin\\sh"),
-                exe("\\bin\\sh"),
+                parse(r"#!\bin\sh"),
+                exe(r"\bin\sh"),
                 "backslashes are recognized as path separator"
             );
             assert_eq!(
                 parse("#!C:\\Program Files\\shell.exe\r\nsome stuff"),
-                exe("C:\\Program Files\\shell.exe"),
+                exe(r"C:\Program Files\shell.exe"),
                 "absolute windows paths are fine"
             );
             assert_eq!(
@@ -192,8 +192,8 @@ mod context {
     #[test]
     fn glob_pathspecs_sets_env_only() {
         for (value, expected) in [
-            (false, "GIT_NOGLOB_PATHSPECS=\"1\""),
-            (true, "GIT_GLOB_PATHSPECS=\"1\""),
+            (false, r#"GIT_NOGLOB_PATHSPECS="1""#),
+            (true, r#"GIT_GLOB_PATHSPECS="1""#),
         ] {
             let ctx = Context {
                 glob_pathspecs: Some(value),
@@ -305,7 +305,7 @@ mod prepare {
     #[test]
     fn single_and_complex_arguments_as_part_of_command_with_shell() {
         let cmd = std::process::Command::from(
-            gix_command::prepare("ls --foo \"a b\"")
+            gix_command::prepare(r#"ls --foo "a b""#)
                 .arg("additional")
                 .command_may_be_shell_script(),
         );
@@ -324,7 +324,7 @@ mod prepare {
     #[test]
     fn single_and_complex_arguments_with_auto_split() {
         let cmd = std::process::Command::from(
-            gix_command::prepare("ls --foo=\"a b\"").command_may_be_shell_script_allow_manual_argument_splitting(),
+            gix_command::prepare(r#"ls --foo="a b""#).command_may_be_shell_script_allow_manual_argument_splitting(),
         );
         assert_eq!(
             format!("{cmd:?}"),
@@ -336,7 +336,7 @@ mod prepare {
     #[test]
     fn single_and_complex_arguments_without_auto_split() {
         let cmd = std::process::Command::from(
-            gix_command::prepare("ls --foo=\"a b\"").command_may_be_shell_script_disallow_manual_argument_splitting(),
+            gix_command::prepare(r#"ls --foo="a b""#).command_may_be_shell_script_disallow_manual_argument_splitting(),
         );
         assert_eq!(format!("{cmd:?}"), quoted(&[*SH, "-c", r#"ls --foo=\"a b\""#, "--"]));
     }
@@ -351,7 +351,7 @@ mod prepare {
         );
         assert_eq!(
             format!("{cmd:?}"),
-            quoted(&[*SH, "-c", "ls \\\"$@\\\"", "--", "--foo=a b"])
+            quoted(&[*SH, "-c", r#"ls \"$@\""#, "--", "--foo=a b"])
         );
     }
 
@@ -366,15 +366,15 @@ mod prepare {
         );
         assert_eq!(
             format!("{cmd:?}"),
-            quoted(&[*SH, "-c", "\\'ls\\' \\\"$@\\\"", "--", "--foo=a b"]),
+            quoted(&[*SH, "-c", r#"\'ls\' \"$@\""#, "--", "--foo=a b"]),
             "looks strange thanks to debug printing, but is the right amount of quotes actually"
         );
     }
 
     #[test]
     fn quoted_windows_command_without_argument_splitting() {
         let cmd = std::process::Command::from(
-            gix_command::prepare("C:\\Users\\O'Shaughnessy\\with space.exe")
+            gix_command::prepare(r"C:\Users\O'Shaughnessy\with space.exe")
                 .arg("--foo='a b'")
                 .command_may_be_shell_script_disallow_manual_argument_splitting()
                 .with_shell()
@@ -385,9 +385,9 @@ mod prepare {
             quoted(&[
                 *SH,
                 "-c",
-                "\\'C:\\\\Users\\\\O\\'\\\\\\'\\'Shaughnessy\\\\with space.exe\\' \\\"$@\\\"",
+                r#"\'C:\\Users\\O\'\\\'\'Shaughnessy\\with space.exe\' \"$@\""#,
                 "--",
-                "--foo=\\'a b\\'"
+                r"--foo=\'a b\'"
             ]),
             "again, a lot of extra backslashes, but it's correct outside of the debug formatting"
         );
@@ -409,7 +409,7 @@ mod prepare {
     #[test]
     fn tilde_path_and_multiple_arguments_as_part_of_command_with_shell() {
         let cmd =
-            std::process::Command::from(gix_command::prepare("~/bin/exe --foo \"a b\"").command_may_be_shell_script());
+            std::process::Command::from(gix_command::prepare(r#"~/bin/exe --foo "a b""#).command_may_be_shell_script());
         let sh = *SH;
         assert_eq!(
             format!("{cmd:?}"),
@@ -421,7 +421,7 @@ mod prepare {
     #[test]
     fn script_with_dollar_at() {
         let cmd = std::process::Command::from(
-            gix_command::prepare("echo \"$@\" >&2")
+            gix_command::prepare(r#"echo "$@" >&2"#)
                 .command_may_be_shell_script()
                 .arg("store"),
         );
@@ -437,7 +437,7 @@ mod prepare {
     #[test]
     fn script_with_dollar_at_has_no_quoting() {
         let cmd = std::process::Command::from(
-            gix_command::prepare("echo \"$@\" >&2")
+            gix_command::prepare(r#"echo "$@" >&2"#)
                 .command_may_be_shell_script()
                 .with_quoted_command()
                 .arg("store"),
@@ -487,7 +487,7 @@ mod spawn {
     #[test]
     fn script_with_dollar_at() -> crate::Result {
         let out = std::process::Command::from(
-            gix_command::prepare("echo \"$@\"")
+            gix_command::prepare(r#"echo "$@""#)
                 .command_may_be_shell_script()
                 .arg("arg"),
         )

gix-config-value/tests/value/path.rs

@@ -10,7 +10,7 @@ mod interpolate {
 
     #[test]
     fn backslash_is_not_special_and_they_are_not_escaping_anything() -> crate::Result {
-        for path in ["C:\\foo\\bar", "/foo/bar"] {
+        for path in [r"C:\foo\bar", "/foo/bar"] {
             let actual = gix_config_value::Path::from(Cow::Borrowed(b(path))).interpolate(Default::default())?;
             assert_eq!(actual, Path::new(path));
             assert!(
@@ -31,8 +31,8 @@ mod interpolate {
 
     #[test]
     fn prefix_substitutes_git_install_dir() {
-        for git_install_dir in &["/tmp/git", "C:\\git"] {
-            for (val, expected) in &[("%(prefix)/foo/bar", "foo/bar"), ("%(prefix)/foo\\bar", "foo\\bar")] {
+        for git_install_dir in &["/tmp/git", r"C:\git"] {
+            for (val, expected) in &[("%(prefix)/foo/bar", "foo/bar"), (r"%(prefix)/foo\bar", r"foo\bar")] {
                 let expected =
                     std::path::PathBuf::from(format!("{}{}{}", git_install_dir, std::path::MAIN_SEPARATOR, expected));
                 assert_eq!(
@@ -103,7 +103,7 @@ mod interpolate {
     fn tilde_with_given_user() -> crate::Result {
         let home = std::env::current_dir()?;
 
-        for path_suffix in &["foo/bar", "foo\\bar", ""] {
+        for path_suffix in &["foo/bar", r"foo\bar", ""] {
             let path = format!("~user{}{}", std::path::MAIN_SEPARATOR, path_suffix);
             let expected = home.join("user").join(path_suffix);
 

gix-config/src/file/mutable/mod.rs

@@ -23,10 +23,10 @@ fn escape_value(value: &BStr) -> BString {
 
     for b in value.iter().copied() {
         match b {
-            b'\n' => buf.push_str("\\n"),
-            b'\t' => buf.push_str("\\t"),
-            b'"' => buf.push_str("\\\""),
-            b'\\' => buf.push_str("\\\\"),
+            b'\n' => buf.push_str(r"\n"),
+            b'\t' => buf.push_str(r"\t"),
+            b'"' => buf.push_str(r#"\""#),
+            b'\\' => buf.push_str(r"\\"),
             _ => buf.push(b),
         }
     }

gix-config/src/parse/event.rs

@@ -37,7 +37,7 @@ impl Event<'_> {
         match self {
             Self::ValueNotDone(e) => {
                 out.write_all(e.as_ref())?;
-                out.write_all(b"\\")
+                out.write_all(br"\")
             }
             Self::Whitespace(e) | Self::Newline(e) | Self::Value(e) | Self::ValueDone(e) => out.write_all(e.as_ref()),
             Self::KeyValueSeparator => out.write_all(b"="),

gix-config/src/parse/nom/tests.rs

@@ -88,7 +88,7 @@ mod section_headers {
 
     #[test]
     fn eof_after_escape_in_sub_section() {
-        assert!(section_header.parse_peek(b"[hello \"hello\\").is_err());
+        assert!(section_header.parse_peek(br#"[hello "hello\"#).is_err());
     }
 
     #[test]
@@ -124,7 +124,7 @@ mod sub_section {
 
     #[test]
     fn zero_copy_simple() {
-        let actual = sub_section.parse_peek(b"name\"").unwrap().1;
+        let actual = sub_section.parse_peek(br#"name""#).unwrap().1;
         assert_eq!(actual.as_ref(), "name");
         assert!(matches!(actual, Cow::Borrowed(_)));
     }
@@ -301,7 +301,7 @@ mod section {
                     whitespace_event(" "),
                     Event::KeyValueSeparator,
                     whitespace_event(" "),
-                    value_event("\"lol\"")
+                    value_event(r#""lol""#)
                 ]
             })
         );
@@ -370,7 +370,7 @@ mod section {
                     whitespace_event(" "),
                     Event::KeyValueSeparator,
                     whitespace_event(" "),
-                    value_event("\"lol\"")
+                    value_event(r#""lol""#)
                 ]
             })
         );
@@ -567,7 +567,7 @@ mod value_continuation {
         let mut events = Vec::new();
         assert!(
             value_impl(b"hello\\\r\r\n        world", &mut events).is_err(),
-            "\\r must be followed by \\n"
+            r"\r must be followed by \n"
         );
     }
 
@@ -634,9 +634,9 @@ mod value_continuation {
             vec![
                 value_not_done_event("1"),
                 newline_event(),
-                value_not_done_event("\"2\" a"),
+                value_not_done_event(r#""2" a"#),
                 newline_event(),
-                value_not_done_event("\\\"3 b\\\""),
+                value_not_done_event(r#"\"3 b\""#),
                 newline_event(),
                 value_done_event("4")
             ]
@@ -664,9 +664,9 @@ mod value_continuation {
             vec![
                 value_not_done_event("\"1"),
                 newline_event(),
-                value_not_done_event("\"2\" a"),
+                value_not_done_event(r#""2" a"#),
                 newline_event(),
-                value_not_done_event("\\\"3 b\\\""),
+                value_not_done_event(r#"\"3 b\""#),
                 newline_event(),
                 value_done_event("4 \"")
             ]
@@ -761,7 +761,7 @@ mod value_no_continuation {
 
     #[test]
     fn garbage_after_continuation_is_err() {
-        assert!(value_impl(b"hello \\afwjdls", &mut Default::default()).is_err());
+        assert!(value_impl(br"hello \afwjdls", &mut Default::default()).is_err());
     }
 
     #[test]