#5057: Avoid mixing slashes for Windows temporary files

autoload/ale/command.vim

@@ -142,7 +142,7 @@ function! s:TemporaryFilename(buffer) abort
 
     " Create a temporary filename, <temp_dir>/<original_basename>
     " The file itself will not be created by this function.
-    return ale#util#Tempname() . (s:is_windows ? '\' : '/') . l:filename
+    return ale#path#GetAbsPath(ale#util#Tempname(), l:filename)
 endfunction
 
 " Given part of a command, replace any % with %%, so that no characters in

autoload/ale/powershell.vim

@@ -8,8 +8,8 @@ function! s:TemporaryPSScript(buffer, input) abort
     " Create a temp dir to house our temp .ps1 script
     " a temp dir is needed as powershell needs the .ps1
     " extension
-    let l:tempdir = ale#util#Tempname() . (has('win32') ? '\' : '/')
-    let l:tempscript = l:tempdir . l:filename
+    let l:tempscript = ale#path#GetAbsPath(ale#util#Tempname(), l:filename)
+    let l:tempdir = fnamemodify(l:tempscript, ':h')
     " Create the temporary directory for the file, unreadable by 'other'
     " users.
     call mkdir(l:tempdir, '', 0750)

test/handler/test_elmmake_handler.vader

@@ -21,7 +21,7 @@ Execute(The elm-make handler should parse Elm 0.19 general problems correctly):
   \ ale_linters#elm#make#Handle(347, [
   \   json_encode({
   \     'type': 'error',
-  \     'path': ale#util#Tempname() . '/Module.elm',
+  \     'path': ale#path#GetAbsPath(ale#util#Tempname(), 'Module.elm'),
   \     'title': 'UNKNOWN IMPORT',
   \     'message': ["error details\n\n", { 'string': 'styled details' }]
   \   }),
@@ -60,7 +60,7 @@ Execute(The elm-make handler should parse Elm 0.19 compilation errors correctly)
   \      'type': 'compile-errors',
   \      'errors': [
   \        {
-  \          'path': ale#util#Tempname() . '/Module.elm',
+  \          'path': ale#path#GetAbsPath(ale#util#Tempname(), 'Module.elm'),
   \          'problems': [
   \            {
   \              'title': 'TYPE MISMATCH',
@@ -186,7 +186,7 @@ Execute(The elm-make handler should parse Elm 0.18 compilation errors correctly)
   \         'details': 'warning details',
   \         'region': {'start': { 'line': 33, 'column': 1 }, 'end': { 'line': 33, 'column': 19 } },
   \         'type': 'warning',
-  \         'file': ale#util#Tempname() . '/Module.elm',
+  \         'file': ale#path#GetAbsPath(ale#util#Tempname(), 'Module.elm'),
   \      }
   \    ]),
   \   json_encode([
@@ -197,7 +197,7 @@ Execute(The elm-make handler should parse Elm 0.18 compilation errors correctly)
   \        'details': 'error details 1',
   \        'region': { 'start': { 'line': 404, 'column': 1 }, 'end': { 'line': 408, 'column': 18 } },
   \        'type': 'error',
-  \        'file': ale#util#Tempname() . '/Module.elm',
+  \        'file': ale#path#GetAbsPath(ale#util#Tempname(), 'Module.elm'),
   \      },
   \      {
   \        'tag': 'TYPE MISMATCH',
@@ -206,7 +206,7 @@ Execute(The elm-make handler should parse Elm 0.18 compilation errors correctly)
   \        'details': 'error details 2',
   \        'region': { 'start': { 'line': 406, 'column': 5}, 'end': { 'line': 407, 'column': 17 } },
   \        'type':'error',
-  \        'file': ale#util#Tempname() . '/Module.elm',
+  \        'file': ale#path#GetAbsPath(ale#util#Tempname(), 'Module.elm'),
   \      },
   \      {
   \        'tag': 'TYPE MISMATCH',
@@ -215,7 +215,7 @@ Execute(The elm-make handler should parse Elm 0.18 compilation errors correctly)
   \        'details': 'error details 3',
   \        'region': { 'start': { 'line': 406, 'column': 5 }, 'end': { 'line': 406, 'column': 93 } },
   \        'type':'error',
-  \        'file': ale#util#Tempname() . '/Module.elm',
+  \        'file': ale#path#GetAbsPath(ale#util#Tempname(), 'Module.elm'),
   \      }
   \    ]),
   \ ])
@@ -276,7 +276,7 @@ Execute(The elm-make handler should put an error on the first line if a line can
   \      'type': 'compile-errors',
   \      'errors': [
   \        {
-  \          'path': ale#util#Tempname() . '/Module.elm',
+  \          'path': ale#path#GetAbsPath(ale#util#Tempname(), 'Module.elm'),
   \          'problems': [
   \            {
   \              'title': 'TYPE MISMATCH',

test/test_format_command.vader

@@ -34,6 +34,7 @@ After:
   delfunction CheckTempFile
   delfunction GetTempBase
 
+  runtime autoload/ale/util.vim
   runtime autoload/ale/command.vim
 
 Execute(FormatCommand should do nothing to basic command strings):
@@ -69,6 +70,18 @@ Execute(FormatCommand should convert %t to a new temporary filename):
   " The two temporary filenames formatted in should be the same.
   AssertEqual g:match[1], g:match[2]
 
+Execute(FormatCommand should normalize mixed Windows temporary paths):
+  if has('win32')
+    function! ale#util#Tempname() abort
+      return 'D:/Personal/Temp/V6UA83E.tmp'
+    endfunction
+
+    let g:result = ale#command#FormatCommand(bufnr('%'), '', '%t', 0, v:null, v:null, [])
+
+    AssertEqual 'D:\Personal\Temp\V6UA83E.tmp\dummy.txt', g:result[0]
+    AssertEqual ale#Escape(g:result[0]), g:result[1]
+  endif
+
 Execute(FormatCommand should not convert %t to a new temporary filename when the input is given as v:false):
   let g:result = ale#command#FormatCommand(bufnr('%'), '', 'foo %t bar %t', 0, v:false, v:null, [])
 

test/test_powershell.vader

@@ -0,0 +1,39 @@
+Before:
+  runtime autoload/ale/powershell.vim
+
+  let g:ale_powershell_powershell_executable = 'pwsh'
+
+After:
+  if exists('g:tempname')
+    call delete(g:tempname, 'rf')
+  endif
+
+  unlet! g:command
+  unlet! g:tempname
+  unlet! g:tempscript
+  unlet! g:ale_powershell_powershell_executable
+
+  runtime autoload/ale/util.vim
+
+Execute(RunPowerShell should normalize mixed Windows temporary paths):
+  if has('win32')
+    let g:tempname = substitute(ale#util#Tempname(), '\\', '/', 'g')
+
+    function! ale#util#Tempname() abort
+      return g:tempname
+    endfunction
+
+    let g:tempscript = ale#path#GetAbsPath(g:tempname, 'script.ps1')
+    let g:command = ale#powershell#RunPowerShell(
+    \   bufnr(''),
+    \   'powershell_powershell',
+    \   ['Write-Output ''ok'''],
+    \)
+
+    AssertEqual
+    \ ale#Escape('pwsh')
+    \   . ' -Exe Bypass -NoProfile -File '
+    \   . ale#Escape(g:tempscript)
+    \   . ' %t',
+    \ g:command
+  endif