Fix windows path check on rust linter (#736)

* Fix rust linter on windows

* Add windows path test

* Use ale#path#IsBufferPath to compare paths

* Fix errors

2 files changed, 35 insertions, 10 deletions

diff --git a/autoload/ale/handlers/rust.vim b/autoload/ale/handlers/rust.vim
index 47b3c7f2..3f9083a5 100644
--- a/autoload/ale/handlers/rust.vim
+++ b/autoload/ale/handlers/rust.vim
@@ -8,13 +8,13 @@ if !exists('g:ale_rust_ignore_error_codes')
 endif
 
 " returns: a list [lnum, col] with the location of the error or []
-function! s:FindErrorInExpansion(span, file_name) abort
-    if a:span.file_name ==# a:file_name
+function! s:FindErrorInExpansion(span, buffer) abort
+    if ale#path#IsBufferPath(a:buffer, a:span.file_name)
         return [a:span.line_start, a:span.line_end, a:span.byte_start, a:span.byte_end]
     endif
 
     if !empty(a:span.expansion)
-        return s:FindErrorInExpansion(a:span.expansion.span, a:file_name)
+        return s:FindErrorInExpansion(a:span.expansion.span, a:buffer)
     endif
 
     return []
@@ -22,7 +22,6 @@ endfunction
 
 " A handler function which accepts a file name, to make unit testing easier.
 function! ale#handlers#rust#HandleRustErrorsForFile(buffer, full_filename, lines) abort
-    let l:filename = fnamemodify(a:full_filename, ':t')
     let l:output = []
 
     for l:errorline in a:lines
@@ -48,7 +47,7 @@ function! ale#handlers#rust#HandleRustErrorsForFile(buffer, full_filename, lines
         for l:span in l:error.spans
             if (
             \   l:span.is_primary
-            \   && (a:full_filename =~ (l:span.file_name . '$') || l:span.file_name ==# '<anon>')
+            \   && (ale#path#IsBufferPath(a:buffer, l:span.file_name) || l:span.file_name ==# '<anon>')
             \)
                 call add(l:output, {
                 \   'lnum': l:span.line_start,
@@ -61,7 +60,7 @@ function! ale#handlers#rust#HandleRustErrorsForFile(buffer, full_filename, lines
             else
                 " when the error is caused in the expansion of a macro, we have
                 " to bury deeper
-                let l:root_cause = s:FindErrorInExpansion(l:span, l:filename)
+                let l:root_cause = s:FindErrorInExpansion(l:span, a:buffer)
 
                 if !empty(l:root_cause)
                     call add(l:output, {
diff --git a/test/handler/test_rust_handler.vader b/test/handler/test_rust_handler.vader
index 11dcf17f..510ae699 100644
--- a/test/handler/test_rust_handler.vader
+++ b/test/handler/test_rust_handler.vader
@@ -1,4 +1,6 @@
 Execute(The Rust handler should handle rustc output):
+  call ale#test#SetFilename('src/playpen.rs')
+
   AssertEqual
   \ [
   \   {
@@ -18,7 +20,7 @@ Execute(The Rust handler should handle rustc output):
   \      'text': 'no method named `wat` found for type `std::string::String` in the current scope',
   \   },
   \ ],
-  \ ale#handlers#rust#HandleRustErrorsForFile(347, 'src/playpen.rs', [
+  \ ale#handlers#rust#HandleRustErrorsForFile(bufnr(''), 'src/playpen.rs', [
   \   '',
   \   'ignore this',
   \   '{"message":"expected one of `.`, `;`, `?`, `}`, or an operator, found `for`","code":null,"level":"error","spans":[{"file_name":"<anon>","byte_start":418,"byte_end":421,"line_start":15,"line_end":15,"column_start":5,"column_end":8,"is_primary":true,"text":[{"text":"    for chr in source.trim().chars() {","highlight_start":5,"highlight_end":8}],"label":null,"suggested_replacement":null,"expansion":null}],"children":[],"rendered":null}',
@@ -28,6 +30,8 @@ Execute(The Rust handler should handle rustc output):
   \ ])
 
 Execute(The Rust handler should handle cargo output):
+  call ale#test#SetFilename('src/playpen.rs')
+
   AssertEqual
   \ [
   \   {
@@ -47,7 +51,7 @@ Execute(The Rust handler should handle cargo output):
   \     'text': 'no method named `wat` found for type `std::string::String` in the current scope',
   \   },
   \ ],
-  \ ale#handlers#rust#HandleRustErrorsForFile(347, 'src/playpen.rs', [
+  \ ale#handlers#rust#HandleRustErrorsForFile(bufnr(''), 'src/playpen.rs', [
   \   '',
   \   'ignore this',
   \   '{"message":{"children":[],"code":null,"level":"error","message":"expected one of `.`, `;`, `?`, `}`, or an operator, found `for`","rendered":null,"spans":[{"byte_end":11508,"byte_start":11505,"column_end":8,"column_start":5,"expansion":null,"file_name":"src/playpen.rs","is_primary":true,"label":null,"line_end":15,"line_start":15,"suggested_replacement":null,"text":[{"highlight_end":8,"highlight_start":5,"text":"    for chr in source.trim().chars() {"}]}]},"package_id":"update 0.0.1 (path+file:///home/w0rp/Downloads/rust-by-example)","reason":"compiler-message","target":{"kind":["bin"],"name":"update","src_path":"/home/w0rp/Downloads/rust-by-example/src/main.rs"}}',
@@ -55,7 +59,27 @@ Execute(The Rust handler should handle cargo output):
   \   '{"message":{"children":[],"code":null,"level":"error","message":"aborting due to previous error","rendered":null,"spans":[]},"package_id":"update 0.0.1 (path+file:///home/w0rp/Downloads/rust-by-example)","reason":"compiler-message","target":{"kind":["bin"],"name":"update","src_path":"/home/w0rp/Downloads/rust-by-example/src/main.rs"}}',
   \ ])
 
+" Execute(The Rust handler should handle cargo output on Windows):
+"   call ale#test#SetFilename('src\nvim.rs')
+" 
+"   AssertEqual
+"   \ [
+"   \   {
+"   \     'lnum': 467,
+"   \     'end_lnum': 467,
+"   \     'type': 'E',
+"   \     'col': 43198,
+"   \     'end_col': 43199,
+"   \     'text': 'expected one of `!` or `::`, found `#`: unexpected token',
+"   \   },
+"   \ ],
+"   \ ale#handlers#rust#HandleRustErrorsForFile(bufnr(''), 'src\nvim.rs', [
+"   \   '{"message":{"children":[],"code":null,"level":"error","message":"expected one of `!` or `::`, found `#`","rendered":null,"spans":[{"byte_end":43199,"byte_start":43198,"column_end":2,"column_start":1,"expansion":null,"file_name":"src\\nvim.rs","is_primary":true,"label":"unexpected token","line_end":467,"line_start":467,"suggested_replacement":null,"text":[{"highlight_end":2,"highlight_start":1,"text":"#[cfg(test)]\r"}]}]},"package_id":"nvim-gtk 0.1.2 (path+file:///E:/daa/local/neovim-gtk)","reason":"compiler-message","target":{"crate_types":["bin"],"kind":["bin"],"name":"nvim-gtk","src_path":"E:\\daa\\local\\neovim-gtk\\src\\main.rs"}}',
+"   \ ])
+
 Execute(The Rust handler should show detailed errors):
+  call ale#test#SetFilename('src/playpen.rs')
+
   AssertEqual
   \ [
   \   {
@@ -67,7 +91,7 @@ Execute(The Rust handler should show detailed errors):
   \     'text': 'mismatched types: expected bool, found integral variable',
   \   },
   \ ],
-  \ ale#handlers#rust#HandleRustErrorsForFile(347, 'src/playpen.rs', [
+  \ ale#handlers#rust#HandleRustErrorsForFile(bufnr(''), 'src/playpen.rs', [
   \   '',
   \   'ignore this',
   \   '{"message":{"children":[],"code":null,"level":"error","message":"mismatched types","rendered":null,"spans":[{"byte_end":54,"byte_start":52,"column_end":23,"column_start":21,"expansion":null,"file_name":"src/playpen.rs","is_primary":true,"label":"expected bool, found integral variable","line_end":4,"line_start":4,"suggested_replacement":null,"text":[{"highlight_end":23,"highlight_start":21,"text":"    let foo: bool = 42;"}]}]},"package_id":"ale-rust-details 0.1.1 (path+file:///home/jon/tmp/ale-rust-details)","reason":"compiler-message","target":{"crate_types":["bin"],"kind":["bin"],"name":"ale-rust-details","src_path":"/home/jon/tmp/ale-rust-details/src/main.rs"}}',
@@ -75,9 +99,11 @@ Execute(The Rust handler should show detailed errors):
   \ ])
 
 Execute(The Rust handler should find correct files):
+  call ale#test#SetFilename('src/noerrors/mod.rs')
+
   AssertEqual
   \ [],
-  \ ale#handlers#rust#HandleRustErrorsForFile(347, 'src/noerrors/mod.rs', [
+  \ ale#handlers#rust#HandleRustErrorsForFile(bufnr(''), 'src/noerrors/mod.rs', [
   \   '',
   \   'ignore this',
   \   '{"message":{"children":[],"code":null,"level":"error","message":"unresolved import `Undefined`","rendered":null,"spans":[{"byte_end":103,"byte_start":94,"column_end":14,"column_start":5,"expansion":null,"file_name":"src/haserrors/mod.rs","is_primary":true,"label":"no `Undefined` in the root","line_end":1,"line_start":1,"suggested_replacement":null,"text":[{"highlight_end":14,"highlight_start":5,"text":"use Undefined;"}]}]},"package_id":"sample 0.1.0 (path+file:///private/tmp/sample)","reason":"compiler-message","target":{"crate_types":["lib"],"kind":["lib"],"name":"sample","src_path":"/private/tmp/sample/src/lib.rs"}}',