Include executable checks in ALEInfo

autoload/ale/debugging.vim

@@ -70,6 +70,45 @@ function! s:EchoGlobalVariables() abort
     endfor
 endfunction
 
+" Echo a command that was run.
+function! s:EchoCommand(item) abort
+    let l:status_message = a:item.status
+
+    " Include the exit code in output if we have it.
+    if a:item.status is# 'finished'
+        let l:status_message .= ' - exit code ' . a:item.exit_code
+    endif
+
+    echom '(' . l:status_message . ') ' . string(a:item.command)
+
+    if g:ale_history_log_output && has_key(a:item, 'output')
+        if empty(a:item.output)
+            echom ''
+            echom '<<<NO OUTPUT RETURNED>>>'
+            echom ''
+        else
+            echom ''
+            echom '<<<OUTPUT STARTS>>>'
+
+            for l:line in a:item.output
+                echom l:line
+            endfor
+
+            echom '<<<OUTPUT ENDS>>>'
+            echom ''
+        endif
+    endif
+endfunction
+
+" Echo the results of an executable check.
+function! s:EchoExecutable(item) abort
+    echom printf(
+    \   '(executable check - %s) %s',
+    \   a:item.status ? 'success' : 'failure',
+    \   a:item.command,
+    \)
+endfunction
+
 function! s:EchoCommandHistory() abort
     let l:buffer = bufnr('%')
 
@@ -78,31 +117,10 @@ function! s:EchoCommandHistory() abort
     endif
 
     for l:item in g:ale_buffer_info[l:buffer].history
-        let l:status_message = l:item.status
-
-        " Include the exit code in output if we have it.
-        if l:item.status is# 'finished'
-            let l:status_message .= ' - exit code ' . l:item.exit_code
-        endif
-
-        echom '(' . l:status_message . ') ' . string(l:item.command)
-
-        if g:ale_history_log_output && has_key(l:item, 'output')
-            if empty(l:item.output)
-                echom ''
-                echom '<<<NO OUTPUT RETURNED>>>'
-                echom ''
+        if l:item.job_id is# 'executable'
+            call s:EchoExecutable(l:item)
         else
-                echom ''
-                echom '<<<OUTPUT STARTS>>>'
-
-                for l:line in l:item.output
-                    echom l:line
-                endfor
-
-                echom '<<<OUTPUT ENDS>>>'
-                echom ''
-            endif
+            call s:EchoCommand(l:item)
         endif
     endfor
 endfunction

autoload/ale/engine.vim

@@ -16,22 +16,34 @@ if !has_key(s:, 'lsp_linter_map')
     let s:lsp_linter_map = {}
 endif
 
-let s:executable_cache_map = {}
+if !has_key(s:, 'executable_cache_map')
+    let s:executable_cache_map = {}
+endif
+
+function! ale#engine#ResetExecutableCache() abort
+    let s:executable_cache_map = {}
+endfunction
 
 " Check if files are executable, and if they are, remember that they are
 " for subsequent calls. We'll keep checking until programs can be executed.
-function! s:IsExecutable(executable) abort
+function! ale#engine#IsExecutable(buffer, executable) abort
     if has_key(s:executable_cache_map, a:executable)
         return 1
     endif
 
+    let l:result = 0
+
     if executable(a:executable)
         let s:executable_cache_map[a:executable] = 1
 
-        return 1
+        let l:result = 1
     endif
 
-    return  0
+    if g:ale_history_enabled
+        call ale#history#Add(a:buffer, l:result, 'executable', a:executable)
+    endif
+
+    return l:result
 endfunction
 
 function! ale#engine#InitBufferInfo(buffer) abort
@@ -755,7 +767,7 @@ function! s:RunLinter(buffer, linter) abort
     else
         let l:executable = ale#linter#GetExecutable(a:buffer, a:linter)
 
-        if s:IsExecutable(l:executable)
+        if ale#engine#IsExecutable(a:buffer, l:executable)
             return s:InvokeChain(a:buffer, a:linter, 0, [])
         endif
     endif

test/test_ale_info.vader

@@ -7,6 +7,7 @@ Before:
   let g:testlinter1 = {'name': 'testlinter1', 'executable': 'testlinter1', 'command': 'testlinter1', 'callback': 'testCB1', 'output_stream': 'stdout'}
   let g:testlinter2 = {'name': 'testlinter2', 'executable': 'testlinter2', 'command': 'testlinter2', 'callback': 'testCB2', 'output_stream': 'stdout'}
 
+  call ale#engine#ResetExecutableCache()
   call ale#linter#Reset()
   let g:ale_linters = {}
   let g:ale_linter_aliases = {}
@@ -351,3 +352,22 @@ Execute (ALEInfo command history should print command output if logging is on):
   \ '',
   \ '<<<NO OUTPUT RETURNED>>>',
   \])
+
+Execute (ALEInfo should include executable checks in the history):
+  let g:ale_buffer_info[bufnr('')] = {'history': []}
+
+  call ale#linter#Define('testft', g:testlinter1)
+  call ale#engine#IsExecutable(bufnr(''), 'echo')
+  call ale#engine#IsExecutable(bufnr(''), 'TheresNoWayThisIsExecutable')
+
+  call CheckInfo([
+  \   ' Current Filetype: testft.testft2',
+  \   'Available Linters: [''testlinter1'']',
+  \   '  Enabled Linters: [''testlinter1'']',
+  \ ' Linter Variables:',
+  \ '',
+  \] + g:globals_lines + g:command_header + [
+  \ '',
+  \ '(executable check - success) echo',
+  \ '(executable check - failure) TheresNoWayThisIsExecutable',
+  \])