Add support for AWS dynamodb

README.markdown

@@ -10,6 +10,7 @@ take on [dbext.vim][], improving on it on the following ways:
 * Supports a modern array of backends, including NoSQL databases:
   - Big Query
   - ClickHouse
+  - DynamoDB
   - Impala
   - jq
   - MongoDB
@@ -47,6 +48,13 @@ to pass to the database.  Results are displayed in a preview window.
     :DB sqlite:myfile.sqlite3 select count(*) from widgets
     :DB redis:/// CLIENT LIST
 
+DynamoDB uses profiles [Configuration and credential file settings][] as
+authentication
+
+* :DB dynamodb:// # use default profile
+* :DB dynamodb://profile_name
+* :DB dynamodb://profile_name@localhost:8888 # To connect on a local dynamodb instance
+
 Give a range to run part or all of the current buffer as a query.
 
     :%DB mysql://root@localhost/bazquux
@@ -79,6 +87,7 @@ try [dadbod-ui][].
 [heroku.vim]: https://tpope.io/vim/heroku.git
 [rails.vim]:  https://tpope.io/vim/rails.git
 [dadbod-ui]:  https://github.com/kristijanhusak/vim-dadbod-ui
+[Configuration and credential file settings]: https://docs.aws.amazon.com/cli/latest/userguide/cli-configure-files.html
 
 ## Installation
 

autoload/db/adapter/dynamodb.vim

@@ -0,0 +1,43 @@
+function! s:command(url, output) abort
+  let url = db#url#parse(a:url)
+  let endpoint_url = []
+  if has_key(url, 'user')
+    let profile = url.user
+    let http_url = 'http://' .. url.host .. ':' .. url.port
+    let endpoint_url = ['--endpoint-url', http_url]
+  else
+    if has_key(url, 'host')
+      let profile = url.host
+    else
+      let profile = 'default'
+    endif
+  endif
+  return ['aws', 'dynamodb', '--profile', profile, '--output', a:output] + endpoint_url
+endfunction
+
+function! db#adapter#dynamodb#input_extension() abort
+  return 'js'
+endfunction
+
+function! db#adapter#dynamodb#output_extension() abort
+  return 'json'
+endfunction
+
+function! db#adapter#dynamodb#input(url, in) abort
+  if filereadable(a:in)
+    let lines = readfile(a:in)
+    return s:command(a:url, 'json') + split(lines[0])
+  endif
+  return ['echo', 'no', 'command']
+endfunction
+
+function! db#adapter#dynamodb#auth_input() abort
+  return v:false
+endfunction
+
+function! db#adapter#dynamodb#tables(url) abort
+  let cmd = s:command(a:url, 'text') + ['list-tables']
+  let out = db#systemlist(cmd)
+  return map(out, 'matchstr(v:val, "\\w*$")')
+endfunction
+