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" Author: Daniel Schemala <istjanichtzufassen@gmail.com>,
" w0rp <devw0rp@gmail.com>
"
" Description: This file implements handlers specific to Rust.
if !exists('g:ale_rust_ignore_error_codes')
let g:ale_rust_ignore_error_codes = []
endif
if !exists('g:ale_rust_ignore_secondary_spans')
let g:ale_rust_ignore_secondary_spans = 0
endif
function! s:ProcessSpan(buffer, error, span) abort
if ale#Var(a:buffer, 'rust_ignore_secondary_spans') && !get(a:span, 'is_primary', 1)
return {}
endif
if !empty(a:span)
" :help ale-loclist-format
let l:output_line = {
\ 'lnum': a:span.line_start,
\ 'end_lnum': a:span.line_end,
\ 'col': a:span.column_start,
\ 'end_col': a:span.column_end-1,
\ 'text': empty(a:span.label) ? a:error.message : printf('%s: %s', a:error.message, a:span.label),
\ 'type': toupper(a:error.level[0]),
\}
" When operating on stdin rustc (and possibly others) gives '<anon>'
" as the file_name. Leaving the filename property of the loclist
" unpopulated makes ale connect such errors with the linted buffer.
if a:span.file_name !=# '<anon>'
let l:output_line['filename'] = a:span.file_name
endif
if has_key(a:error, 'rendered') && !empty(a:error.rendered)
let l:output_line.detail = a:error.rendered
endif
return l:output_line
endif
return {}
endfunction
function! ale#handlers#rust#HandleRustErrors(buffer, lines) abort
let l:output = []
" Format of JSON is documented at
" rustc: https://doc.rust-lang.org/rustc/json.html
" cargo: https://doc.rust-lang.org/cargo/reference/external-tools.html#json-messages
for l:diagnosticsline in a:lines
" ignore everything that is not JSON
if l:diagnosticsline !~# '^{'
continue
endif
let l:diagnostics = json_decode(l:diagnosticsline)
if has_key(l:diagnostics, 'message') && type(l:diagnostics.message) is v:t_dict
let l:diagnostics = l:diagnostics.message
endif
if !has_key(l:diagnostics, 'code')
continue
endif
if !empty(l:diagnostics.code) && index(g:ale_rust_ignore_error_codes, l:diagnostics.code.code) > -1
continue
endif
let l:spans = []
" FIXME One might also wish to loop over l:diagnostics.children and
" their spans.
for l:span in l:diagnostics.spans
call add(l:spans, l:span)
let l:expansion = l:span.expansion
if !empty(l:expansion)
let l:expansion_span = l:expansion.span
call add(l:spans, l:expansion_span)
endif
endfor
for l:span in l:spans
let l:output_line = s:ProcessSpan(a:buffer, l:diagnostics, l:span)
if !empty(l:output_line)
call add(l:output, l:output_line)
endif
endfor
endfor
return l:output
endfunction
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