A quasi real time vim markdown preview plugin

.gitignore

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+autoload/java/
+.idea/
+target/
+*.class
+
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+# Package Files #
+*.war
+*.ear
+*.jar
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*

README.md

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+[TOC]
+
+作为Vim粉丝一枚，一直在寻找一款好用的Markdown预览插件，功能要简单，能在书写之余偶尔撇一下效果即可，毕竟Markdown语法都烂熟于心了。先是偶然看到了Chrome一款插件[Markdown Viewer](https://chrome.google.com/webstore/detail/markdown-viewer/ckkdlimhmcjmikdlpkmbgfkaikojcbjk)，风格非常喜欢，遗憾的是不能与Vim同步，后来又发现一款Vim插件[markdown-preview.vim](https://github.com/iamcco/markdown-preview.vim)，但是我装了好几次，在我的机器上老是报错。故事本来到此就结束了，但是程序猿乞肯如此轻易屈服，程序猿要让这天，再遮不住眼，要这地，再埋不了心，程序猿要用自己的双手开天辟地！经过程序猿在键盘上一顿猛干，[markdown-preview-sync](https://github.com/pingao777/markdown-preview-sync)横空出世了！好了，就吹到这吧。
+
+运行效果如下：
+
+![snapshot-en](http://ozgrgjwvp.bkt.clouddn.com/markdown-preview-sync/en.png)
+
+![snapshot-ch](http://ozgrgjwvp.bkt.clouddn.com/markdown-preview-sync/ch.png)
+
+下面简单介绍下这款插件：
+
+### 特性
+
+- 代码高亮
+- MathJax
+- 自定义CSS
+- GFM-Table
+- 目录TOC
+
+### 安装准备
+
+- Jre8及以上
+- Vim支持python2或python3
+
+### 安装方式
+
+如果你使用[pathogen](https://github.com/tpope/vim-pathogen)，可以运行如下命令：
+
+```git
+cd your-path-to-bundle
+git clone git@github.com:pingao777/markdown-preview-sync.git
+```
+
+如果你没有使用任何插件管理工具，直接将/autoload和/plugin目录中的文件分别放在Vim的/autoload和/plugin目录即可。
+
+注：/src目录是项目源代码，如果不关注直接删掉就可以了。
+
+### 设置
+
+```vim
+" Chrome和Firefox都可以，推荐使用Chrome
+" 可以这样设置Chrome路径
+let g:markdown_preview_sync_chrome_path = ""
+
+" 设置Firefox浏览器路径
+let g:markdown_preview_sync_firefox_path = ""
+
+" (Optional)设置自定义CSS主题，将你的CSS文件放在autoload/java/webapp/css文件夹下，
+" 以“主题名-theme.css”方式命名，然后设置如下变量
+let g:markdown_preview_sync_theme = "主题名"
+
+" 配置快捷键
+autocmd filetype markdown nnoremap <F9> :MarkSyncPreview<cr>
+autocmd filetype markdown nnoremap <S-F9> :MarkSyncClose<cr>
+```
+
+最后，欢迎大家多多提意见和建议。
+
+---
+
+### Feature
+
+- Code Highlight
+- MathJax
+- Custom CSS
+- GFM-Table
+- TOC
+
+### Prerequisite
+
+- Jre8 or above
+- Vim with python2 or python3 support
+
+### Installation
+
+If you use [pathogen](https://github.com/tpope/vim-pathogen), do this:
+
+```git
+cd your-path-to-bundle
+git clone git@github.com:pingao777/markdown-preview-sync.git
+```
+
+If you don't use any plugin manager, just copy files in /autoload and /plugin to Vim's /autoload and /plugin directory.
+
+Note: /src directory is source code, you can simply delete it if you don't need it.
+
+### Setting
+
+```vim
+" Both Chrome and Firefox are good, but Chrome is prefer
+" Set Chrome path
+let g:markdown_preview_sync_chrome_path = ""
+
+" Set Firefox path
+let g:markdown_preview_sync_firefox_path = ""
+
+" (Optional)Set your own css theme, put your css file in
+" autoload/java/webapp/css directory with a name: name-theme.css,
+" then set
+let g:markdown_preview_sync_theme = "name"
+
+" Set key
+autocmd filetype markdown nnoremap <F9> :MarkSyncPreview<cr>
+autocmd filetype markdown nnoremap <S-F9> :MarkSyncClose<cr>
+```
+
+Last but not least, comments and issues are welcome.

autoload/mpsync.vim

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+if !has("python") && !has("python3")
+    echo "vim has to be compiled with +python or +python3 to run this"
+    finish
+endif
+
+if exists("g:markdown_preview_sync_loaded")
+    finish
+endif
+
+let g:markdown_preview_sync_loaded = 1
+
+if !exists("g:markdown_preview_sync_port")
+    let g:markdown_preview_sync_port = 7788
+endif
+
+if !exists("g:markdown_preview_sync_theme")
+    let g:markdown_preview_sync_theme = "github"
+endif
+
+let s:plugin_root_dir = fnamemodify(resolve(expand("<sfile>:p")), ":h")
+
+python << EOF
+import sys
+from os.path import normpath, join
+import vim
+plugin_root_dir = vim.eval('s:plugin_root_dir')
+python_root_dir = normpath(join(plugin_root_dir, 'python'))
+sys.path.insert(0, python_root_dir)
+import java_vim_bridge
+java_vim_bridge.set_port(vim.eval('g:markdown_preview_sync_port'))
+EOF
+
+function! s:start()
+    execute "silent !start /b java -jar \"" . s:plugin_root_dir . "\"/java/markdown-preview-sync.jar " . g:markdown_preview_sync_port . " " . g:markdown_preview_sync_theme
+endfunction
+
+function! s:is_start()
+    return exists("g:markdown_preview_sync_start")
+endfunction
+
+function! s:open()
+    if exists("g:markdown_preview_sync_chrome_path")
+        execute "silent !start " . g:markdown_preview_sync_chrome_path . " --app=http://127.0.0.1:" . g:markdown_preview_sync_port . "/index"
+    elseif exists("g:markdown_preview_sync_firefox_path")
+        execute "silent !start " . g:markdown_preview_sync_firefox_path . " http://127.0.0.1:" . g:markdown_preview_sync_port . "/index"
+    else
+        echoerr "Not set browser path"
+    endif
+endfunction
+
+function! s:sync()
+python <<EOF
+path = vim.eval('expand("%:p")')
+content = vim.eval('join(getline(1, line("$")), "\n")')
+current = int(vim.eval('line(".")'))
+if current == 1:
+    java_vim_bridge.sync(path, content, 1)
+else:
+    bottom = int(vim.eval('line("w$")'))
+    java_vim_bridge.sync(path, content, bottom)
+EOF
+endfunction
+
+function! s:close()
+python <<EOF
+path = vim.eval('expand("%:p")')
+java_vim_bridge.close(path)
+EOF
+endfunction
+
+function! s:stop()
+python <<EOF
+path = vim.eval('expand("%:p")')
+java_vim_bridge.stop()
+EOF
+endfunction
+
+function! s:autocmd()
+    augroup markdown_preview_sync
+        autocmd!
+        autocmd cursormoved,cursormovedi <buffer> call s:trigger_sync()
+        autocmd bufwrite <buffer> call s:sync()
+        autocmd vimleave * call s:stop()
+    augroup end
+endfunction
+
+function! s:trigger_sync()
+    if !exists("b:old_current")
+        let b:old_current = 0
+    endif
+    if !exists("b:old_bottom ")
+        let b:old_bottom = 0
+    endif
+    if !exists("b:old_last ")
+        let b:old_last = 0
+    endif
+
+    let l:new_current = line(".")
+    let l:new_bottom = line("w$")
+    let l:new_last = line("$")
+    if b:old_last ==# l:new_last
+        if b:old_bottom > l:new_bottom
+            if b:old_bottom - l:new_bottom >= 5
+                call s:sync()
+                let b:old_current = l:new_current
+                let b:old_bottom = l:new_bottom
+                let b:old_last = l:new_last
+            endif
+        elseif b:old_bottom < l:new_bottom
+            call s:sync()
+            let b:old_current = l:new_current
+            let b:old_bottom = l:new_bottom
+            let b:old_last = l:new_last
+        elseif b:old_current != l:new_current
+            call s:sync()
+            let b:old_current = l:new_current
+            let b:old_bottom = l:new_bottom
+            let b:old_last = l:new_last
+        endif
+    else
+        call s:sync()
+        let b:old_current = l:new_current
+        let b:old_bottom = l:new_bottom
+        let b:old_last = l:new_last
+    endif
+
+
+endfunction
+
+function! mpsync#preview()
+    if !s:is_start()
+        call s:start()
+        let g:markdown_preview_sync_start = 1
+    endif
+    call s:open()
+    call s:autocmd()
+endfunction
+
+function! mpsync#close()
+    if s:is_start()
+        call s:close()
+    endif
+endfunction

autoload/python/java_vim_bridge.py

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+# -*- coding: utf-8 -*-
+"""Bridge connect vim to java
+
+@author wocanmei
+@date 2018-07-15 17:56:25
+"""
+
+import base64
+
+try:
+    from urllib.parse import urlencode
+    from urllib.request import urlopen, Request
+except ImportError:
+    from urllib import urlencode
+    from urllib2 import urlopen, Request
+
+
+url_pre = 'http://127.0.0.1:port'
+
+
+def set_port(port):
+    global url_pre
+    url_pre = url_pre.replace('port', port)
+
+
+def sync(path, content, bottom):
+    params = {'path': path, 'content': base64.b64encode(content), 'bottom': bottom}
+    request = Request(url_pre + '/sync', data = urlencode(params))
+    urlopen(request)
+
+
+def close(path):
+    params = {'path': path}
+    request = Request(url_pre + '/close?' + urlencode(params))
+    urlopen(request)
+
+
+def stop():
+    request = Request(url_pre + '/stop')
+    urlopen(request)

plugin/mpsync.vim

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+command! -nargs=0 MarkSyncPreview call mpsync#preview()
+command! -nargs=0 MarkSyncClose call mpsync#close()