Hide xattr errors unless --extended

exa now ignores errors when checking for extended attributes when the user didn’t explicitly demand that they be checked. If a file does have xattrs, it’ll still display the @ in the permissions column; errors will now just cause the @ to be hidden instead.

This changed a lot of the xtests, which were displaying the error message in a few situations. Those tests have gained @-suffixed companions so the actual error messages can still be tested.

Fixes #178 (finally)

src/output/details.rs

@@ -191,10 +191,31 @@ impl<'a> Render<'a> {
                     let mut errors = Vec::new();
                     let mut xattrs = Vec::new();
 
+                    // There are three “levels” of extended attribute support:
+                    //
+                    // 1. If we’re compiling without that feature, then
+                    //    exa pretends no files have attributes.
+                    // 2. If the feature is enabled but the --extended flag
+                    //    hasn’t been specified, then display an @ in the
+                    //    permissions column for files with xattrs, but don’t
+                    //    display anything else.
+                    // 3. If the --extended flag *has* been specified, then
+                    //    display the @, the attributes and their lengths,
+                    //    and any errors encountered when getting them.
+                    //
+                    // For a while, exa took a stricter approach to (2): if
+                    // an error occurred while checking a file’s xattrs, exa
+                    // would display that error even though the attributes
+                    // weren’t actually being shown! This was confusing, as
+                    // users were being shown errors for something they didn’t
+                    // explicitly ask for, and just cluttered up the output.
+                    // So now errors aren’t printed unless the user passes
+                    // --extended to signify that they want to see them.
+
                     if xattr::ENABLED {
                         match file.path.attributes() {
                             Ok(xs) => xattrs.extend(xs),
-                            Err(e) => errors.push((e, None)),
+                            Err(e) => if self.opts.xattr { errors.push((e, None)) },
                         };
                     }
 

xtests/file_names_T

@@ -7,17 +7,12 @@
 ├── escape: [\u{1b}]
 ├── form-feed: [\u{c}]
 ├── invalid-utf8-1: [<5B>]
-│  └── <Error: path somehow contained a NUL?>
 ├── invalid-utf8-2: [<5B>(]
-│  └── <Error: path somehow contained a NUL?>
 ├── invalid-utf8-3: [<5B>(]
-│  └── <Error: path somehow contained a NUL?>
 ├── invalid-utf8-4: [<5B>(<28>(]
-│  └── <Error: path somehow contained a NUL?>
 ├── links
 │  ├── another: [\n] -> /testcases/file-names/new-line-dir: [\n]/another: [\n]
 │  ├── broken -> /testcases/file-names/new-line-dir: [\n]/broken
-│  │  └── <No such file or directory (os error 2)>
 │  └── subfile -> /testcases/file-names/new-line-dir: [\n]/subfile
 ├── new-line-dir: [\n]
 │  ├── another: [\n]

xtests/file_names_T@

@@ -0,0 +1,29 @@
+/testcases/file-names
+├── ansi: [\u{1b}[34mblue\u{1b}[0m]
+├── ascii: hello
+├── backspace: [\u{8}]
+├── bell: [\u{7}]
+├── emoji: [🆒]
+├── escape: [\u{1b}]
+├── form-feed: [\u{c}]
+├── invalid-utf8-1: [<5B>]
+│  └── <Error: path somehow contained a NUL?>
+├── invalid-utf8-2: [<5B>(]
+│  └── <Error: path somehow contained a NUL?>
+├── invalid-utf8-3: [<5B>(]
+│  └── <Error: path somehow contained a NUL?>
+├── invalid-utf8-4: [<5B>(<28>(]
+│  └── <Error: path somehow contained a NUL?>
+├── links
+│  ├── another: [\n] -> /testcases/file-names/new-line-dir: [\n]/another: [\n]
+│  ├── broken -> /testcases/file-names/new-line-dir: [\n]/broken
+│  │  └── <No such file or directory (os error 2)>
+│  └── subfile -> /testcases/file-names/new-line-dir: [\n]/subfile
+├── new-line-dir: [\n]
+│  ├── another: [\n]
+│  └── subfile
+├── new-line: [\n]
+├── return: [\r]
+├── tab: [\t]
+├── utf-8: pâté
+└── vertical-tab: [\u{b}]

xtests/links_T

@@ -1,11 +1,8 @@
 /testcases/links
 ├── broken -> nowhere
-│  └── <No such file or directory (os error 2)>
 ├── current_dir -> .
 ├── forbidden -> /proc/1/root
-│  └── <Permission denied (os error 13)>
 ├── itself -> itself
-│  └── <Too many levels of symbolic links (os error 40)>
 ├── parent_dir -> ..
 ├── root -> /
 ├── some_file

xtests/links_T@

@@ -0,0 +1,14 @@
+/testcases/links
+├── broken -> nowhere
+│  └── <No such file or directory (os error 2)>
+├── current_dir -> .
+├── forbidden -> /proc/1/root
+│  └── <Permission denied (os error 13)>
+├── itself -> itself
+│  └── <Too many levels of symbolic links (os error 40)>
+├── parent_dir -> ..
+├── root -> /
+├── some_file
+├── some_file_absolute -> /testcases/links/some_file
+├── some_file_relative -> some_file
+└── usr -> /usr

xtests/proc_1_root

@@ -1,2 +1 @@
 /proc/1/root
-└── <Permission denied (os error 13)>

xtests/proc_1_root_@

@@ -0,0 +1,2 @@
+/proc/1/root
+└── <Permission denied (os error 13)>

xtests/run.sh

@@ -86,11 +86,12 @@ sudo -u cassowary $exa $testcases/permissions -lghR 2>&1 | diff -q - $results/pe
 
 # File names
 # (Mostly escaping control characters in file names)
-COLUMNS=80 $exa $testcases/file-names    2>&1 | diff -q - $results/file_names   || exit 1
-COLUMNS=80 $exa $testcases/file-names -x 2>&1 | diff -q - $results/file_names_x || exit 1
-COLUMNS=80 $exa $testcases/file-names -R 2>&1 | diff -q - $results/file_names_R || exit 1
-           $exa $testcases/file-names -1 2>&1 | diff -q - $results/file_names_1 || exit 1
-           $exa $testcases/file-names -T 2>&1 | diff -q - $results/file_names_T || exit 1
+COLUMNS=80 $exa $testcases/file-names     2>&1 | diff -q - $results/file_names    || exit 1
+COLUMNS=80 $exa $testcases/file-names -x  2>&1 | diff -q - $results/file_names_x  || exit 1
+COLUMNS=80 $exa $testcases/file-names -R  2>&1 | diff -q - $results/file_names_R  || exit 1
+           $exa $testcases/file-names -1  2>&1 | diff -q - $results/file_names_1  || exit 1
+           $exa $testcases/file-names -T  2>&1 | diff -q - $results/file_names_T  || exit 1
+           $exa $testcases/file-names -T@ 2>&1 | diff -q - $results/file_names_T@ || exit 1
 
 # At least make sure it handles invalid UTF-8 arguments without crashing
 $exa $testcases/file-names/* >/dev/null || exit 1
@@ -144,10 +145,12 @@ env LANG=ja_JP.UTF-8  $exa $testcases/dates -l | diff -q - $results/dates_jp  ||
 
 
 # Links
-COLUMNS=80 $exa $testcases/links    2>&1 | diff -q - $results/links        || exit 1
-           $exa $testcases/links -1 2>&1 | diff -q - $results/links_1      || exit 1
-           $exa $testcases/links -T 2>&1 | diff -q - $results/links_T      || exit 1
-           $exa /proc/1/root     -T 2>&1 | diff -q - $results/proc_1_root  || exit 1
+COLUMNS=80 $exa $testcases/links     2>&1 | diff -q - $results/links         || exit 1
+           $exa $testcases/links -1  2>&1 | diff -q - $results/links_1       || exit 1
+           $exa $testcases/links -T  2>&1 | diff -q - $results/links_T       || exit 1
+           $exa $testcases/links -T@ 2>&1 | diff -q - $results/links_T@      || exit 1
+           $exa /proc/1/root     -T  2>&1 | diff -q - $results/proc_1_root   || exit 1
+           $exa /proc/1/root     -T@ 2>&1 | diff -q - $results/proc_1_root_@ || exit 1
 
 # There’ve been bugs where the target file wasn’t printed properly when the
 # symlink file was specified on the command-line directly.