使用Python编写vim插件的简单示例

if !has('python')
 echo "Error: Required vim compiled with +python"
 finish
endif

" Vim comments start with a double quote.
" Function definition is VimL. We can mix VimL and Python in
" function definition.
function! Reddit()
 
" We start the python code like the next line.
 
python << EOF
# the vim module contains everything we need to interface with vim from
# python. We need urllib2 for the web service consumer.
import vim, urllib2
# we need json for parsing the response
import json
 
# we define a timeout that we'll use in the API call. We don't want
# users to wait much.
TIMEOUT = 20
URL = "http://reddit.com/.json"
 
try:
 # Get the posts and parse the json response
 response = urllib2.urlopen(URL, None, TIMEOUT).read()
 json_response = json.loads(response)
 
 posts = json_response.get("data", "").get("children", "")
 
 # vim.current.buffer is the current buffer. It's list-like object.
 # each line is an item in the list. We can loop through them delete
 # them, alter them etc.
 # Here we delete all lines in the current buffer
 del vim.current.buffer[:]
 
 # Here we append some lines above. Aesthetics.
 vim.current.buffer[0] = 80*"-"
 
 for post in posts:
 # In the next few lines, we get the post details
 post_data = post.get("data", {})
 up = post_data.get("ups", 0)
 down = post_data.get("downs", 0)
 title = post_data.get("title", "NO TITLE").encode("utf-8")
 score = post_data.get("score", 0)
 permalink = post_data.get("permalink").encode("utf-8")
 url = post_data.get("url").encode("utf-8")
 comments = post_data.get("num_comments")
 
 # And here we append line by line to the buffer.
 # First the upvotes
 vim.current.buffer.append("↑ %s"%up)
 # Then the title and the url
 vim.current.buffer.append(" %s [%s]"%(title, url,))
 # Then the downvotes and number of comments
 vim.current.buffer.append("↓ %s | comments: %s [%s]"%(down, comments, permalink,))
 # And last we append some "-" for visual appeal.
 vim.current.buffer.append(80*"-")
 
except Exception, e:
 print e
 
EOF
" Here the python code is closed. We can continue writing VimL or python again.
endfunction

function! SomeName(arg1, arg2, arg3)
 " Get the first argument by name in VimL
 let firstarg=a:arg1
 
 " Get the second argument by position in Viml
 let secondarg=a:1
 
 " Get the arguments in python
 
 python << EOF
 import vim
 
 first_argument = vim.eval("a:arg1") #or vim.eval("a:0")
 second_argument = vim.eval("a:arg2") #or vim.eval("a:1")

if !exists("g:reddit_apicall_timeout")
 let g:reddit_apicall_timeout=40
endif

TIMEOUT = vim.eval("g:reddit_apicall_timeout")

let g:reddit_apicall_timeout=60