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Add documentation to point to File::open or OpenOptions::open instead of is_file to check read/write possibility #73243

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merged 5 commits into from
Jun 28, 2020
Merged

Add documentation to point to File::open or OpenOptions::open instead of is_file to check read/write possibility #73243

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93cbad6
Add documentation to point to `!is_dir` instead of `is_file`
poliorcetics Jun 11, 2020
ec63f9d
Added the note to Metadata too
poliorcetics Jun 11, 2020
c1243db
Make a note about is_dir vs is_file in Path too
poliorcetics Jun 11, 2020
d25d6c5
Update the documentation to point to open instead of is_file and is_dir
poliorcetics Jun 27, 2020
8e8c54a
Added the parapgrah to path::Path::is_file too
poliorcetics Jun 27, 2020
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16 changes: 16 additions & 0 deletions src/libstd/fs.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1033,8 +1033,16 @@ impl Metadata {
/// [`is_dir`], and will be false for symlink metadata
/// obtained from [`symlink_metadata`].
///
/// When the goal is simply to read from (or write to) the source, the most
/// reliable way to test the source can be read (or written to) is to open
/// it. Only using `is_file` can break workflows like `diff <( prog_a )` on
/// a Unix-like system for example. See [`File::open`] or
/// [`OpenOptions::open`] for more information.
///
/// [`is_dir`]: struct.Metadata.html#method.is_dir
/// [`symlink_metadata`]: fn.symlink_metadata.html
/// [`File::open`]: struct.File.html#method.open
/// [`OpenOptions::open`]: struct.OpenOptions.html#method.open
///
/// # Examples
///
Expand Down Expand Up @@ -1307,8 +1315,16 @@ impl FileType {
/// [`is_dir`] and [`is_symlink`]; only zero or one of these
/// tests may pass.
///
/// When the goal is simply to read from (or write to) the source, the most
/// reliable way to test the source can be read (or written to) is to open
/// it. Only using `is_file` can break workflows like `diff <( prog_a )` on
/// a Unix-like system for example. See [`File::open`] or
/// [`OpenOptions::open`] for more information.
///
/// [`is_dir`]: struct.FileType.html#method.is_dir
/// [`is_symlink`]: struct.FileType.html#method.is_symlink
/// [`File::open`]: struct.File.html#method.open
/// [`OpenOptions::open`]: struct.OpenOptions.html#method.open
///
/// # Examples
///
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12 changes: 8 additions & 4 deletions src/libstd/path.rs
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Expand Up @@ -2503,11 +2503,15 @@ impl Path {
/// # See Also
///
/// This is a convenience function that coerces errors to false. If you want to
/// check errors, call [fs::metadata] and handle its Result. Then call
/// [fs::Metadata::is_file] if it was Ok.
/// check errors, call [`fs::metadata`] and handle its Result. Then call
/// [`fs::Metadata::is_file`] if it was Ok.
///
/// [fs::metadata]: ../../std/fs/fn.metadata.html
/// [fs::Metadata::is_file]: ../../std/fs/struct.Metadata.html#method.is_file
/// Note that the explanation about using `open` instead of `is_file`
/// that is present in the [`fs::Metadata`] documentation also applies here.
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///
/// [`fs::metadata`]: ../../std/fs/fn.metadata.html
/// [`fs::Metadata`]: ../../std/fs/struct.Metadata.html
/// [`fs::Metadata::is_file`]: ../../std/fs/struct.Metadata.html#method.is_file
#[stable(feature = "path_ext", since = "1.5.0")]
pub fn is_file(&self) -> bool {
fs::metadata(self).map(|m| m.is_file()).unwrap_or(false)
Expand Down