emacs-使用advice自动更新ox-publish的待发布org-roam文件目录

[2024-04-04 周四 20:12]

最近在研究用Emacs写博客。由于并不在意博客样式，因此选择用ox-publish直接将指定的org-roam文件导出为html再上传GitHub通过GitHub Pages托管。

参考文献：
Emacs: 使用 org publish 生成个人博客
 26.ox-html 浅析与 ox-publish 使用介绍

由于org-roam的所有文件均在一个文件夹内，又不需要将所有的文件作为博客内容发表，因此接下来会利用org-roam的功能，动态发布打上了 blog 标签的文件。

1. 获取带blog标签的文件

(defun my/ox-files ()
  "Return a list of note files containing 'blog' tag." ;
  (seq-uniq
   (seq-map
    #'car
    (org-roam-db-query
     [:select [nodes:file]
              :from tags
              :left-join nodes
              :on (= tags:node-id nodes:id)
              :where (like tag (quote "%\"blog\"%"))]))))

上述函数可以返回org-roam-db中标有 blog 的文件路径列表。

2. 配置ox-publish

根据参考文献，需要指定 org-publish-project-alist 如下：

(setq org-publish-project-alist
        `(("posts"
           :base-directory ,website-directory
           :base-extension "org"
           :publishing-directory ,my/publish-directory
           :publishing-function org-html-publish-to-html
           :with-author t
           :auto-sitemap t
           :recursive nil
           :exclude ".*"
           :include ,(my/ox-files)
           :html-link-home "index.html"
           :sitemap-filename "index.org"
           :sitemap-title "目录"
           :sitemap-sort-files anti-chronologically
           :html-head:css "<link rel='stylesheet' type='text/css' href='/org.css'/>")
          ("personal-website" :components ("posts"))))

上图代码通过 :exclude ".*" 排除所有文件，然后通过 :include ,(my/ox-files) 将带有 blog 标签的org-roam文件路径纳入 ox-publish 的处理范畴中

3. 动态更新待发布文件列表

由于上述 org-publish-project-alist 仅会执行单次，因此需要通过 advice-add 的方式让其在每次发布时均执行一次，达成动态更新的效果。

(defun my/org-project-update (&optional ARG PRED) ;;使用before会接收到原函数参数，因此需要添加optional
  (setq org-publish-project-alist
        `(("posts"
           :base-directory ,website-directory
           :base-extension "org"
           :publishing-directory ,my/publish-directory
           :publishing-function org-html-publish-to-html
           :with-author t
           :auto-sitemap t
           :recursive nil
           :exclude ".*"
           :include ,(my/ox-files)
           :html-link-home "index.html"
           :sitemap-filename "index.org"
           :sitemap-title "目录"
           :sitemap-sort-files anti-chronologically
           :html-head:css "<link rel='stylesheet' type='text/css' href='/org.css'/>")
          ("personal-website" :components ("posts")))))
(advice-add 'org-export-dispatch :before 'my/org-project-update)

这样，每次 org-export-dispatch 函数（按键为 C-c C-e ）运行前，均会更新待发布文件路径。

4. 为每个html文件插入CSS

利用 org-export 的hook自动设置，读取 ~/.emacs.d/org.css 文件内容并插入发布的html文件中

(defun my/org-inline-css-hook (exporter)
  "Insert custom inline css"
  (when (eq exporter 'html)
    (setq org-html-head-include-default-style nil)
    (setq org-html-head (concat "<style type=\"text/css\">\n <!--/*--><![CDATA[/*><!--*/\n" (with-temp-buffer (insert-file-contents "~/.emacs.d/org.css") (buffer-string)) "/*] ]>*/-->\n </style>\n"))))

(add-hook 'org-export-before-processing-hook 'my/org-inline-css-hook)

5. 一些其他的小设置

5.1. 导出时单换行也视为换行

(setq org-export-preserve-breaks t)

5.2. emacs-使用ox-rss导出rss.xml文件

5.3. org.css文件内容

/* (progn (forward-line 2)
   (delete-region (point) (point-max))
   (insert-file-contents "~/.emacs.d/org.css")
   (goto-char (point-max))
   (insert "#+end_src"))*/

/*@import url("https://fonts.googleapis.com/css2?family=Lora:wght@500&display=fallback");
@import url("https://fonts.googleapis.com/css2?family=Inconsolata&display=fallback");
*/

body {
    margin: 2% auto;
    width: 90%;
    max-width: 100%;
    background-color: rgba(242,229,188,0.5);
    /* background-color: rgba(255,255,255,0.5); */
    font-size: 18px;
    line-height: 1.4em;
}
@media screen and (min-width: 600px) {
    body {
        font-size: 18px;
    }
}

@media screen and (min-width: 910px) {
    body {
        width: 900px;
    }
}
#preamble {
    width: 80%;
    max-width: 980px;
    text-align: right;
    margin: auto;
}

hr {
    border: none;
    border-top: 5px double #333;
    margin: 0px 0;
}

.button {
    border: none;
    color: black;
    padding: 6px 14px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    margin: 4px 2px;
    transition-duration: 0.4s;
    cursor: pointer;
}

.button:hover {
    background-color: #3a1616;
    color: white;
}

.todo {
    background-color: #9d0006;
    color: #fbf1c7;
    padding: .1em 0.3em;
    border-radius: 3px;
    background-clip: padding-box;
    font-size: $code-size;
    font-family: ui-monospace, SFMono-Regular, SF Mono, Menlo, Consolas, Liberation Mono, monospace;
    line-height: 1;
}

.done {
    background-color: #427b58;
    color: #fbf1c7;
    padding: .1em 0.3em;
    border-radius: 3px;
    background-clip: padding-box;
    font-size: $code-size;
    font-family: ui-monospace, SFMono-Regular, SF Mono, Menlo, Consolas, Liberation Mono, monospace;
    line-height: 1;
}

#postamble p {
    font-size: 80%;
    margin: .2em;
}

#content, .content {
    width: 80%;
    max-width: 980px;
    margin: auto;
}

#org-div-home-and-up{
    position: fixed;
    right: 0.5em;
    margin-top: 70px;
    font-family:sans-serif;
}

#table-of-contents {
    margin-top: 105px;
    font-size: 12pt;
    position: fixed;
    left: 0em;
    top: 0em;
    background: white;
    max-height: 80%;
    overflow: auto;
}

#table-of-contents h2 {
    display: none;
}
#table-of-contents li {
    clear: both;
}
.timestamp {
    color: #928374;
    font-size: $smaller;
}

.timestamp-kwd {
    color: #5f9ea0;
}

@media screen and (max-width: 1200px) {
    #table-of-contents {
        position: relative;
        margin-top: 0px;
    }
}

/* p:not(blockquote > p) :not(ol > p) { */
/*     text-indent: 2em; */
/* } */
p {
    margin: 1em auto;
}

.title {
    font-size: 30px;
    line-height: 1.3;
    font-weight: bold;
    color: #0c2340;
}

h2:not(#table-of-contents > h2) {
    font-size: 30px;
    line-height: 1.2;
    position: relative;
    color: #204060;
}

h2::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: 0;
    width: 100%;
    height: 2px;
    background-color: black;
}

h3:not(#table-of-contents > h3) {
    font-size: 20px;
    line-height: 1.1;
    position: relative;
    color: #4b748d;
}

h3::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: 0;
    width: 100%;
    height: 2px;
    /* border-bottom: 1px dashed black; */
}

h4 {
    font-size: 14px;
    line-height: 1.1;
    font-weight: bold;
}


a {
    cursor: pointer;
    text-decoration: none;
}

a:link {
    color: #458588;
    /* text-decoration: underline; */
}

a:hover {
    /* font-weight: bold; */
    text-decoration: underline;
    /* color: #076678; */
}

.figure {
    text-align: center;
}

a:visited{
    color: #8f3f71;
    /* text-decoration: underline; */
}

img {
    max-width: 100%;
    vertical-align: middle;
}
.MathJax_Display {
    margin: 0!important;
    width: $smaller!important;
}
@media screen and (max-width: 1200px) {
    img {
        width: 400px;
    }
    .MathJax_Display {
        margin: 0!important;
        width: $smaller!important;
    }
}

.org-src-container {
    font-size: 14px;
    outline: 2px dashed #ccc;
    outline-offset: 10px;
    position: relative;

}
.org-src-container>pre {
    overflow: auto;
    font-family: ui-monospace, SFMono-Regular, SF Mono, Menlo, Cascadia Code,Consolas, Liberation Mono, monospace;
}

.org-src-container>pre:before {
    display: block;
    position: absolute;
    background-color: #b3b3b3;
    top: 0;
    right: 0;
    padding: 0 0.5em;
    border-bottom-left-radius: 8px;
    border: 0;
    color: white;
    font-size: $code-size;

}
pre {
    overflow: auto;

}
.example{
    font-size: 14px;
    outline: 2px dashed #ccc;
    outline-offset: 10px;
    position: relative;
    
}
.example::before {
    content: "Results";
}
pre:before {
    display: block;
    position: absolute;
    background-color: #b3b3b3;
    top: 0;
    right: 0;
    padding: 0 0.5em;
    border-bottom-left-radius: 8px;
    border: 0;
    color: white;
    font-size: $code-size;
}
/* .org-src-container::before { */
/*     content: "Copy"; */
/*     position: absolute; */
/*     top: 5px; */
/*     right: 5px; */
/*     padding: 5px; */
/*     background-color: #ccc; */
/*     color: #fff; */
/*     border-radius: 3px; */
/*     cursor: pointer; */
/* } */

code {
    font-size: 16px;
    color: #427b58;
}

.subtitle {
    text-align: right;
}

blockquote {
    border-left: 3px solid #ccc;
    padding-left: 10px; /* Optional: add some left padding for the content */
    margin-inline-start: 0px;
    margin-inline-end: 0px;
}

.info {
    overflow: hidden;
}

.created {
    float: right;
}

.updated {
    float: left;
}

.org-ol {
    list-style-type: decimal; /* Set the list style type to decimal numbers */
    /* margin-left: 0.5em; /\* Add left margin to the list *\/ */
}

b {
    color: #9d0006;
}

#footnotes {
    position: fixed;
    left: auto;
    right: 0;
    top: 105px;
    bottom: 0;
    width: 20%;
    padding: 10px;
    overflow: auto;
    font-size: 14px;
    z-index: 9999;
}

#footnotes h2 {
    display: none;
}

@media screen and (max-width: 1200px) {
    #footnotes {
        position: static;
        left: 0;
        right: 0;
        bottom: 0;
        width: 100%;
        max-height: 30%;
        overflow: auto;
        padding: 10px;
        font-size: 14px;
        z-index: 9999;
    }
}