First init.

.obsidian/plugins/email-block-plugin/main.js

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+/*
+THIS IS A GENERATED/BUNDLED FILE BY ESBUILD
+if you want to view the source, please visit the github repository of this plugin
+*/
+
+var __defProp = Object.defineProperty;
+var __getOwnPropDesc = Object.getOwnPropertyDescriptor;
+var __getOwnPropNames = Object.getOwnPropertyNames;
+var __hasOwnProp = Object.prototype.hasOwnProperty;
+var __export = (target, all) => {
+  for (var name in all)
+    __defProp(target, name, { get: all[name], enumerable: true });
+};
+var __copyProps = (to, from, except, desc) => {
+  if (from && typeof from === "object" || typeof from === "function") {
+    for (let key of __getOwnPropNames(from))
+      if (!__hasOwnProp.call(to, key) && key !== except)
+        __defProp(to, key, { get: () => from[key], enumerable: !(desc = __getOwnPropDesc(from, key)) || desc.enumerable });
+  }
+  return to;
+};
+var __toCommonJS = (mod) => __copyProps(__defProp({}, "__esModule", { value: true }), mod);
+
+// main.ts
+var main_exports = {};
+__export(main_exports, {
+  default: () => MailBlockPlugin
+});
+module.exports = __toCommonJS(main_exports);
+var import_obsidian = require("obsidian");
+var MailBlockPlugin = class extends import_obsidian.Plugin {
+  async onload() {
+    console.log("email block loading...");
+    this.registerMarkdownCodeBlockProcessor("email", async (src, el, ctx) => {
+      let parameters = null;
+      try {
+        parameters = this.readParameters(src, ctx);
+      } catch (e) {
+        el.createEl("h3", { text: "Email parameters invalid: \n" + e.message });
+        return;
+      }
+      try {
+        const rootEl = el.createEl("div", { cls: "email-block email-block-border" });
+        let fromContent = void 0;
+        if (parameters.from !== void 0) {
+          rootEl.createEl("div", { cls: "email-block-info", text: "From:" });
+          fromContent = this.replaceVariables(this.renderAddress(parameters.from), parameters.variables);
+          rootEl.createEl("div", { cls: "email-block-info-value", text: fromContent });
+        }
+        let toContent = void 0;
+        if (parameters.to !== void 0) {
+          rootEl.createEl("div", { cls: "email-block-info", text: "To:" });
+          toContent = this.replaceVariables(this.renderAddress(parameters.to), parameters.variables);
+          rootEl.createEl("div", { cls: "email-block-info-value", text: toContent });
+        }
+        let ccContent = void 0;
+        if (parameters.cc !== void 0) {
+          rootEl.createEl("div", { cls: "email-block-info", text: "Cc:" });
+          ccContent = this.replaceVariables(this.renderAddress(parameters.cc), parameters.variables);
+          rootEl.createEl("div", { cls: "email-block-info-value", text: ccContent });
+        }
+        let bccContent = void 0;
+        if (parameters.bcc !== void 0) {
+          rootEl.createEl("div", { cls: "email-block-info", text: "Bcc:" });
+          bccContent = this.replaceVariables(this.renderAddress(parameters.bcc), parameters.variables);
+          rootEl.createEl("div", { cls: "email-block-info-value", text: bccContent });
+        }
+        rootEl.createEl("div", { cls: "email-block-info", text: "Subject:" });
+        const subjectContent = this.replaceVariables(parameters.subject, parameters.variables);
+        rootEl.createEl("div", { cls: "email-block-info-value", text: subjectContent });
+        const bodyContent = rootEl.createEl("div", { cls: "email-block-body" });
+        await this.renderBody(bodyContent, parameters.body, parameters.variables, ctx);
+        if (parameters.showmailto) {
+          const data = "mailto:" + this.encodeToHtml(toContent) + "?subject=" + this.encodeToHtml(subjectContent) + (ccContent !== void 0 ? "&cc=" + this.encodeToHtml(ccContent) : "") + (bccContent !== void 0 ? "&bcc=" + this.encodeToHtml(bccContent) : "") + (bodyContent.innerText.length !== 0 ? "&body=" + this.encodeToHtml(bodyContent.innerText) : "");
+          const mailToButton = rootEl.createEl("div", { cls: "email-block-mailto" }).createEl("a", { href: data, text: "Mailto" });
+          (0, import_obsidian.setIcon)(mailToButton, "mail");
+        }
+      } catch (error) {
+        el.createEl("h3", { text: error });
+      }
+    });
+  }
+  readParameters(yamlString, ctx) {
+    if (yamlString.contains("[[") && !yamlString.contains('"[[')) {
+      yamlString = yamlString.replace("[[", '"[[');
+      yamlString = yamlString.replace("]]", ']]"');
+    }
+    let extraBody = "";
+    if (yamlString.contains("---")) {
+      let data = yamlString.split("---");
+      yamlString = data[0];
+      extraBody = data[1];
+    }
+    if (yamlString.contains("{{") && !yamlString.contains('"{{')) {
+      yamlString = yamlString.replace("{{", '"{{');
+      yamlString = yamlString.replace("}}", '}}"');
+    }
+    const parameters = (0, import_obsidian.parseYaml)(yamlString);
+    parameters.to = this.fixAddress(parameters.to);
+    parameters.cc = this.fixAddress(parameters.cc);
+    parameters.bcc = this.fixAddress(parameters.bcc);
+    if (parameters.subject == void 0) {
+      parameters.subject = "";
+    } else {
+      parameters.subject = parameters.subject.replace('"{{', "{{");
+      parameters.subject = parameters.subject.replace('}}"', "}}");
+    }
+    if (parameters.showmailto == void 0) {
+      parameters.showmailto = true;
+    }
+    if (parameters.body === void 0) {
+      parameters.body = extraBody;
+    }
+    if (parameters.variables === void 0) {
+      parameters.variables = {};
+    }
+    const sourceFile = this.app.metadataCache.getFirstLinkpathDest(ctx.sourcePath, "");
+    if (sourceFile != null) {
+      const sourceCache = this.app.metadataCache.getFileCache(sourceFile);
+      if (sourceCache != null) {
+        if (sourceCache.frontmatter != void 0) {
+          for (const [key, value] of Object.entries(sourceCache.frontmatter)) {
+            if (value && typeof value.toString === "function") {
+              parameters.variables[key] = value.toString();
+            }
+          }
+        }
+      }
+    }
+    return parameters;
+  }
+  fixAddress(address) {
+    if (address === void 0) {
+      return void 0;
+    }
+    let fixedAddress = "";
+    if (Array.isArray(address)) {
+      fixedAddress = address.join(",");
+    } else {
+      fixedAddress = address;
+    }
+    fixedAddress = fixedAddress.replace(/\s/g, "").replace(";", ",");
+    return fixedAddress;
+  }
+  renderAddress(address) {
+    if (Array.isArray(address)) {
+      return address.join(", ");
+    }
+    return address.split(",").join(", ");
+  }
+  async renderBody(bodyContentEl, bodyContent, variables, ctx) {
+    if (bodyContent === void 0) {
+      return;
+    }
+    if (bodyContent.startsWith("[[")) {
+      bodyContent = bodyContent.substring(2, bodyContent.length - 2);
+      const mdFile = this.app.metadataCache.getFirstLinkpathDest(bodyContent, ctx.sourcePath);
+      if (mdFile != null) {
+        let mdContent = await this.app.vault.read(mdFile);
+        mdContent = this.replaceVariables(mdContent, variables);
+        await import_obsidian.MarkdownRenderer.renderMarkdown(mdContent, bodyContentEl, mdFile.path, new import_obsidian.Component());
+      }
+    } else {
+      bodyContent = this.replaceVariables(bodyContent, variables);
+      let lines = bodyContent.split("\n");
+      lines.forEach((line) => {
+        bodyContentEl.createEl("div", { cls: "email-block-body-line", text: line });
+      });
+    }
+  }
+  replaceVariables(content, variables) {
+    if (content === void 0) {
+      return "";
+    }
+    let resultingContent = content;
+    for (const [variable, value] of Object.entries(variables)) {
+      if (value != void 0) {
+        resultingContent = resultingContent == null ? void 0 : resultingContent.replace("{{" + variable + "}}", value);
+      }
+    }
+    return resultingContent;
+  }
+  encodeToHtml(rawStr) {
+    if (rawStr === void 0) {
+      return "";
+    }
+    return encodeURIComponent(rawStr);
+  }
+  onunload() {
+    console.log("Unloading email plugin...");
+  }
+};
+
+/* nosourcemap */

.obsidian/plugins/email-block-plugin/manifest.json

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+{
+	"id": "email-block-plugin",
+	"name": "Email code block",
+	"version": "1.0.1",
+	"minAppVersion": "0.15.0",
+	"description": "This plugin renders an email code block.",
+	"author": "JoLeaf",
+	"authorUrl": "https://github.com/JoLeaf",
+	"fundingUrl": "https://ko-fi.com/joleaf",
+	"isDesktopOnly": false
+}

.obsidian/plugins/email-block-plugin/styles.css

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+/* Styles */
+
+.email-block {
+    display: grid;
+    grid-template-columns: 1fr 6fr;
+    row-gap: 4px;
+    padding: 4px;
+}
+
+.email-block-border {
+    border: 1px solid gray;
+    border-radius: 5px;
+}
+
+.email-block-info {
+    font-style: italic;
+    font-size: 80%;
+    align-self: center;
+}
+
+.email-block-info-value {
+    font-size: 90%;
+    align-self: center;
+}
+
+.email-block-body {
+    grid-column-start: 1;
+    grid-column-end: span 2;
+    border-left: 2px gray solid;
+    padding-left: 5px;
+}
+
+.email-block-body-line {
+
+}
+
+.email-block-mailto {
+    grid-column-start: 1;
+    grid-row-start: 1;
+    grid-column-end: span 2;
+    --icon-size: 2rem;
+}
+
+.email-block-error {
+    color: red !important;
+}