把Markdown文本发布到微信公众号文章
开源工具转换Markdown到HTML
估计很多人都是这样，平常工作在github，等到有成果要发布，又要写微信公众号。
github用Markdown,微信公众号，至少截止今天，还是沿用富文本的方式。不是说富文本不好，但每次精心撰写的内容，重新排一遍版，还真是怪烦的。
如果在github是使用jekyll相对会容易一点，在页面上拷贝、到微信粘贴一下，大多内容都会差不多。否则就只好转换成html显示在浏览器，然后再拷贝粘贴。
Markdown转换成html大多人都会，有很多所见即所得的工具软件，比如Marked2，不过多数都是收费的。其实用免费的工具包就不错，比如pandoc。在Mac安装pandoc很容易：
brew install pandoc
重点是，pandoc直接转换出来的文本，因为只有正文部分，所以格式失真比较多，中文部分因为没有matedata说明，干脆就是乱码，所以要有比较好的html头和尾的配合会比较好。这里整理了一个我正在使用的：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" />
<title>test</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<style id="mkstylesheet">
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#mkreplaced-toc{list-style-position:inside;padding:0;margin:0 0 0 1rem;list-style-type:none}#mkreplaced-toc li::before{content:''}#mkreplaced-toc li{font-size:1rem;line-height:1.25;font-weight:normal}#mkreplaced-toc li ul{font-size:1.3rem;font-weight:300;padding:.5rem 0;margin:0 0 0 1rem}#mkreplaced-toc li.missing{list-style-type:none !important}#mkreplaced-toc.max-1 ul,#mkreplaced-toc.max1 ul{display:none}#mkreplaced-toc.max-2 ul ul,#mkreplaced-toc.max2 ul ul{display:none}#mkreplaced-toc.max-3 ul ul ul,#mkreplaced-toc.max3 ul ul ul{display:none}#mkreplaced-toc.max-4 ul ul ul ul,#mkreplaced-toc.max4 ul ul ul ul{display:none}#mkreplaced-toc.max-5 ul ul ul ul ul,#mkreplaced-toc.max5 ul ul ul ul ul{display:none}.rtl{direction:rtl;text-align:right}@media print{body{background:white;line-height:1.4}html,body,#wrapper{max-width:100%;width:100%;-webkit-text-size-adjust:none;-webkit-perspective:none !important;box-sizing:border-box;width:auto;border:0;margin:0;padding:0;float:none;-moz-box-shadow:none !important;-webkit-box-shadow:none !important;box-shadow:none !important}mark{background:transparent !important}h1,h2,h3,h4,h5,h6{page-break-after:avoid}p,h2,h3{orphans:3;widows:3}section{page-break-before:avoid}pre>code{white-space:pre;word-break:break-word}#generated-toc,#firstdiff,#toc-title,#mkdocumentprogress,#mkincludechart,#mkprogressbar1,#mkprogressbar2,.mkscrollmeter,#alllinks,.popup{display:none !important}.suppressprintlinks a{color:inherit !important;text-decoration:none !important;border-bottom:none !important;cursor:default !important}.hrefafterlinktext #wrapper a:link:after,.hrefafterlinktext #wrapper a:visited:after{content:" (" attr(href) ") ";font-size:90%;opacity:0.9}.nocodebreak pre{page-break-inside:avoid}img,table,figure{page-break-inside:avoid}.breakfootnotes .footnotes{page-break-before:always}.breakfootnotes .footnotes hr{display:none}#mktoctitle{display:block}#print-title{display:block;border-bottom:solid 1px #666}#wrapper pre{white-space:pre;white-space:pre-wrap;word-wrap:break-word}#wrapper #generated-toc-clone,#wrapper #mkreplaced-toc{display:block}.task-list .task-list-item{list-style-type:none !important}.task-list .gh-complete.task-list-item .task-list-item-checkbox:before{content:'\2713';background:#838387}.task-list .task-list-item-checkbox{-webkit-appearance:none;position:relative}.task-list .task-list-item-checkbox:before{content:' ';border:solid 1px #aaa;width:1em;height:1em;display:block;border-radius:2px;left:-20px;top:-.75em;color:white;font-weight:bold;line-height:1;text-align:center;position:absolute}}
#wrapper #generated-toc-clone,#wrapper #mkreplaced-toc,#wrapper #generated-toc-clone ul,#wrapper #mkreplaced-toc ul{list-style-position:inside}#wrapper #generated-toc-clone li.missing,#wrapper #mkreplaced-toc li.missing{list-style-type: none!important}#wrapper #generated-toc-clone,#wrapper #mkreplaced-toc{list-style-type: upper-roman}#wrapper #generated-toc-clone>li>ul,#wrapper #mkreplaced-toc>li>ul {list-style-type: decimal}#wrapper #generated-toc-clone>li>ul>li>ul,#wrapper #mkreplaced-toc>li>ul>li>ul{list-style-type: decimal-leading-zero}#wrapper #generated-toc-clone>li>ul>li>ul>li>ul,#wrapper #mkreplaced-toc>li>ul>li>ul>li>ul{list-style-type: lower-greek}#wrapper #generated-toc-clone>li>ul>li>ul>li>ul>li>ul,#wrapper #mkreplaced-toc>li>ul>li>ul>li>ul>li>ul{list-style-type: disc}#wrapper #generated-toc-clone>li>ul>li>ul>li>ul>li>ul>li>ul,#wrapper #mkreplaced-toc>li>ul>li>ul>li>ul>li>ul>li>ul{list-style-type: square}#wrapper #generated-toc-clone,#wrapper #mkreplaced-toc{list-style-position:outside!important;margin-left:2rem;}
</style>
<style id="mkprintstyles">@media print{#wrapper #generated-toc-clone,#generated-toc{display:none!important}
html,body,#wrapper{font-size:10pt!important}
}
</style>
</head>
<body class="normal firstload">
<div id="wrapper">
</div>
<script>(function(factory){if(typeof define==="function"&&define.amd){define("bidi_helpers",[],factory)}else{window.bidi_helpers=factory()}})(function(){var module={};module.Dir={RTL:-1,UNKNOWN:0,LTR:1};module.Format={LRE:"\u202A",RLE:"\u202B",PDF:"\u202C",LRM:"\u200E",RLM:"\u200F"};module.ltrChars_="A-Za-z\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u02B8\u0300-\u0590\u0800-\u1FFF\u2C00-\uFB1C\uFE00-\uFE6F\uFEFD-\uFFFF";module.rtlChars_="\u0591-\u07FF\uFB1D-\uFDFF\uFE70-\uFEFC";module.ltrDirCheckRe_=new RegExp("^[^"+module.rtlChars_+"]*["+module.ltrChars_+"]");module.ltrCharReg_=new RegExp("["+module.ltrChars_+"]");module.hasAnyLtr=function(text){return module.ltrCharReg_.test(text)};module.rtlDirCheckRe_=new RegExp("^[^"+module.ltrChars_+"]*["+module.rtlChars_+"]");module.rtlRe=module.rtlDirCheckRe_;module.isRtlText=function(text){return module.rtlDirCheckRe_.test(text)};module.isLtrText=function(text){return module.ltrDirCheckRe_.test(text)};module.isRequiredLtrRe_=/^http:\/\/.*/;module.hasNumeralsRe_=/\d/;module.estimateDirection=function(text,detectionThreshold){var rtlCount=0;var totalCount=0;var hasWeaklyLtr=false;var tokens=text.split(/\s+/);for(var i=0;i<tokens.length;i++){var token=tokens[i];if(module.isRtlText(token)){rtlCount++;totalCount++}else{if(module.isRequiredLtrRe_.test(token)){hasWeaklyLtr=true}else{if(module.hasAnyLtr(token)){totalCount++}else{if(module.hasNumeralsRe_.test(token)){hasWeaklyLtr=true}}}}}return totalCount==0?(hasWeaklyLtr?module.Dir.LTR:module.Dir.UNKNOWN):(rtlCount/totalCount>detectionThreshold?module.Dir.RTL:module.Dir.LTR)};return module});(function(factory){if(typeof define==="function"&&define.amd){define("bidiweb",["bidi_helpers"],factory)}else{window.bidiweb=factory(bidi_helpers)}})(function(bidi_helpers){var module={};var IProcessor={makeRtl:function(element){},makeLtr:function(element){}};var css_processor=function(classes){return{makeRtl:function(element){element.classList.add(classes.rtl)},makeLtr:function(element){element.classList.add(classes.ltr)}}};var style_processor=function(falign){return{makeRtl:function(element){element.style.direction="rtl";if(falign){element.style.textAlign="right"}},makeLtr:function(element){element.style.direction="ltr";if(falign){element.style.textAlign="left"}}}};module.processors={css:css_processor,style:style_processor};var nodeListMock=function(node){var list=[node];list.item=function(i){return list[i]};return list};module.process=function(query,processor){var elements;if(query instanceof NodeList){elements=query}else{if(query instanceof Node){elements=nodeListMock(query)}else{elements=document.querySelectorAll(query)}}module.process_elements(elements,processor);return elements};module.process_elements=function(elements,processor){for(var index=0;index<elements.length;index++){var element=elements.item(index);var text=element.textContent||element.value||element.placeholder||"";var dir=bidi_helpers.estimateDirection(text,0.4);if(dir==bidi_helpers.Dir.RTL){processor.makeRtl(element)}else{if(dir==bidi_helpers.Dir.LTR){processor.makeLtr(element)}}}};module.process_css=function(query,classes){var proc=module.processors.css(classes);return module.process(query,proc)};module.process_style=function(query,falign){var proc=module.processors.style(falign);return module.process(query,proc)};module.style=function(query){return module.process_style(query,true)};module.css=function(query){return module.process_css(query,{rtl:"rtl",ltr:"ltr"})};module.htmlToElement=function(html){var container=document.createElement("div");container.innerHTML=html;return container};module.html_css=function(html){var container=module.htmlToElement(html);var nodes=container.querySelectorAll("*");module.css(nodes);return container.innerHTML};module.html_style=function(html){var container=module.htmlToElement(html);var nodes=container.querySelectorAll("*");module.style(nodes);return container.innerHTML};return module});</script>
</body>
</html>
把上面两段html的内容分别保存为_markdown_head.html和_markdown_foot.html。然后转换的时候使用下面命令行（建议你直接保存成bash脚本比如说叫md2html.sh）：
#!/bin/sh
pandoc -B ~/html_t/_markdown_head.html -A ~/html_t/_markdown_foot.html $1 -o $2
以后转换的时候直接运行./md2html.sh abc.md abc.html就可以了。这样方式转换的html文件，可以直接在浏览器中打开，然后全选、拷贝，到微信公众号的后台粘贴，预览一下看看，失真很小，感觉比jekyll转换成的页面失真都会小很多。
