Add isort for python import sorting

autoload/codefmt/isort.vim

@@ -0,0 +1,51 @@
+" Copyright 2020 Google Inc. All rights reserved.
+"
+" Licensed under the Apache License, Version 2.0 (the "License");
+" you may not use this file except in compliance with the License.
+" You may obtain a copy of the License at
+"
+"     http://www.apache.org/licenses/LICENSE-2.0
+"
+" Unless required by applicable law or agreed to in writing, software
+" distributed under the License is distributed on an "AS IS" BASIS,
+" WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+" See the License for the specific language governing permissions and
+" limitations under the License.
+
+
+let s:plugin = maktaba#plugin#Get('codefmt')
+
+
+""
+" @private
+" Formatter: isort
+function! codefmt#isort#GetFormatter() abort
+  let l:formatter = {
+      \ 'name': 'isort',
+      \ 'setup_instructions': 'Install isort ' .
+          \ '(https://pypi.python.org/pypi/isort/).'}
+
+  function l:formatter.IsAvailable() abort
+    return executable(s:plugin.Flag('isort_executable'))
+  endfunction
+
+  function l:formatter.AppliesToBuffer() abort
+    return &filetype is# 'python'
+  endfunction
+
+  ""
+  " Reformat the current buffer with isort or the binary named in
+  " @flag(isort_executable)
+  "
+  " We implement Format(), and not FormatRange{,s}(), because isort doesn't
+  " provide a hook for formatting a range
+  function l:formatter.Format() abort
+    let l:executable = s:plugin.Flag('isort_executable')
+
+    call codefmt#formatterhelpers#Format([
+        \ l:executable,
+        \ '-'])
+  endfunction
+
+  return l:formatter
+endfunction

doc/codefmt.txt

@@ -93,6 +93,10 @@ Default: 'yapf' `
 The path to the black executable.
 Default: 'black' `
 
+                                                     *codefmt:isort_executable*
+The path to the isort executable.
+Default: 'isort' `
+
                                                        *codefmt:gn_executable*
 The path to the gn executable.
 Default: 'gn' `

instant/flags.vim

@@ -88,6 +88,10 @@ call s:plugin.Flag('yapf_executable', 'yapf')
 " The path to the black executable.
 call s:plugin.Flag('black_executable', 'black')
 
+""
+" The path to the isort executable.
+call s:plugin.Flag('isort_executable', 'isort')
+
 ""
 " The path to the gn executable.
 call s:plugin.Flag('gn_executable', 'gn')

plugin/register.vim

@@ -70,6 +70,7 @@ call s:registry.AddExtension(codefmt#ktfmt#GetFormatter())
 call s:registry.AddExtension(codefmt#luaformatterfiveone#GetFormatter())
 call s:registry.AddExtension(codefmt#nixpkgs_fmt#GetFormatter())
 call s:registry.AddExtension(codefmt#autopep8#GetFormatter())
+call s:registry.AddExtension(codefmt#isort#GetFormatter())
 call s:registry.AddExtension(codefmt#black#GetFormatter())
 call s:registry.AddExtension(codefmt#yapf#GetFormatter())
 call s:registry.AddExtension(codefmt#rustfmt#GetFormatter())