Génère un index si nécessaire.

gulpfile.js

@@ -4,6 +4,7 @@ const del = require("del");
 
 const pandoc = require("./lib/pandoc");
 const drawio = require("./lib/drawio");
+const index = require("./lib/index");
 
 const SRC_DIR = process.env.SRC || "src";
 const DEST_DIR = process.env.OUTPUT || "public/";
@@ -17,7 +18,8 @@ exports.clean = clean;
 
 const assets = () => src(ASSET_GLOB).pipe(dest(DEST_DIR));
 const graphs = () => src(GRAPH_GLOB).pipe(drawio()).pipe(dest(DEST_DIR));
-const prez = () => src(PREZ_GLOB).pipe(pandoc()).pipe(dest(DEST_DIR));
+const prez = () =>
+  src(PREZ_GLOB).pipe(index()).pipe(pandoc()).pipe(dest(DEST_DIR));
 
 exports.graphs = graphs;
 exports.assets = assets;

lib/index.js

+const { obj } = require("through2");
+const { callbackify } = require("util");
+const File = require("vinyl");
+const PluginError = require("plugin-error");
+
+/**
+ * @param {ReadableStream} stream
+ * @return {Promise<Buffer>}
+ */
+function streamToBuffer(stream) {
+  const chunks = [];
+  return new Promise((resolve, reject) => {
+    stream.on("data", (chunk) => chunks.push(chunk));
+    stream.once("end", () => resolve(Buffer.concat(chunks)));
+    stream.once("error", reject);
+  });
+}
+
+/**
+ * @param {File} file
+ * @return {Promise<string>}
+ */
+async function vinylToString(file) {
+  if (file.isStream()) {
+    const buffer = await streamToBuffer(file.contents);
+    return buffer.toString();
+  }
+  if (file.isBuffer()) {
+    return file.contents.toString();
+  }
+  return "";
+}
+
+const pandocTitleBlockRegExp = /^%( .+(?:\n  .+)*)?\n%( .+(?:\n  .+)*)?\n%( .+)?\n/u;
+
+/**
+ * @param {string} text
+ * @return {object|null}
+ */
+function parsePandocTitleBlock(text) {
+  const match = pandocTitleBlockRegExp.exec(text);
+  if (!match) {
+    return null;
+  }
+  return { title: match[1].trim() };
+}
+
+/**
+ * @param {string} text
+ * @return {object|null}
+ */
+function parseYamlTitleBlock(text) {
+  if (!text.startsWith("---\n")) {
+    return null;
+  }
+  throw new PluginError(
+    "index",
+    new Error("yaml title block is not supported"),
+    {
+      lineNumber: 1,
+    }
+  );
+}
+
+const renderIndex = (inputs) =>
+  `% Présentations
+% Dev@Science
+% ${new Date().toLocaleDateString("fr-FR", {
+    year: "numeric",
+    month: "2-digit",
+    day: "2-digit",
+  })}
+
+# Présentations
+
+<style>
+.reveal section img.icon {vertical-align:top;margin:0;height:1em}
+.reveal ul {display:flex;width:100%;max-height:50vh;flex-flow:column wrap;list-style-type:none;justify-content:center}
+.reveal ul li {display:inline;width:auto}
+</style>
+
+${inputs
+  .map(
+    (input) =>
+      `- [${input.titleBlock.title}](${input.relative.replace(
+        ".md",
+        ".html"
+      )})` +
+      `[<img class="plain icon" src="file_pdf.png"/>](${
+        input.dirname.substr(input.base.length + 1) + ".pdf"
+      })`
+  )
+  .join("\n")}`;
+
+module.exports = () => {
+  const inputs = [];
+  return obj(
+    callbackify(async function (input, _enc) {
+      const text = await vinylToString(input);
+      input.titleBlock = parsePandocTitleBlock(text) ||
+        parseYamlTitleBlock(text) || { title: input.basename };
+      inputs.push(input);
+      this.push(input);
+    }),
+    callbackify(async function () {
+      if (inputs.find((file) => file.relative === "index.md")) {
+        console.log("found index.md, bailing out");
+        return;
+      }
+      inputs.sort((a, b) =>
+        a.titleBlock.title.localeCompare(b.titleBlock.title)
+      );
+      const contents = renderIndex(inputs);
+      this.push(
+        new File({
+          base: "/",
+          path: "/index.md",
+          contents: Buffer.from(contents),
+        })
+      );
+    })
+  );
+};

package-lock.json

@@ -1387,6 +1387,17 @@
       "requires": {
         "graceful-fs": "^4.1.11",
         "through2": "^2.0.3"
+      },
+      "dependencies": {
+        "through2": {
+          "version": "2.0.5",
+          "resolved": "https://registry.npmjs.org/through2/-/through2-2.0.5.tgz",
+          "integrity": "sha512-/mrRod8xqpA+IHSLyGCQ2s8SPHiCDEeQJSep1jqLYeEUClOFG2Qsh+4FU6G9VeqpZnGW/Su8LQGc4YKni5rYSQ==",
+          "requires": {
+            "readable-stream": "~2.3.6",
+            "xtend": "~4.0.1"
+          }
+        }
       }
     },
     "fs.realpath": {
@@ -2110,48 +2121,6 @@
         }
       }
     },
-    "gulp-exec": {
-      "version": "4.0.0",
-      "resolved": "https://registry.npmjs.org/gulp-exec/-/gulp-exec-4.0.0.tgz",
-      "integrity": "sha512-A9JvTyB3P4huusd/43bTr6SDg3MqBxL9AQbLnsKSO6/91wVkHfxgeJZlgDMkqK8sMel4so8wcko4SZOeB1UCgA==",
-      "requires": {
-        "lodash.template": "^4.4.0",
-        "plugin-error": "^1.0.1",
-        "through2": "^3.0.1"
-      },
-      "dependencies": {
-        "lodash._reinterpolate": {
-          "version": "3.0.0",
-          "resolved": "https://registry.npmjs.org/lodash._reinterpolate/-/lodash._reinterpolate-3.0.0.tgz",
-          "integrity": "sha1-DM8tiRZq8Ds2Y8eWU4t1rG4RTZ0="
-        },
-        "lodash.template": {
-          "version": "4.5.0",
-          "resolved": "https://registry.npmjs.org/lodash.template/-/lodash.template-4.5.0.tgz",
-          "integrity": "sha512-84vYFxIkmidUiFxidA/KjjH9pAycqW+h980j7Fuz5qxRtO9pgB7MDFTdys1N7A5mcucRiDyEq4fusljItR1T/A==",
-          "requires": {
-            "lodash._reinterpolate": "^3.0.0",
-            "lodash.templatesettings": "^4.0.0"
-          }
-        },
-        "lodash.templatesettings": {
-          "version": "4.2.0",
-          "resolved": "https://registry.npmjs.org/lodash.templatesettings/-/lodash.templatesettings-4.2.0.tgz",
-          "integrity": "sha512-stgLz+i3Aa9mZgnjr/O+v9ruKZsPsndy7qPZOchbqk2cnTU1ZaldKK+v7m54WoKIyxiuMZTKT2H81F8BeAc3ZQ==",
-          "requires": {
-            "lodash._reinterpolate": "^3.0.0"
-          }
-        },
-        "through2": {
-          "version": "3.0.1",
-          "resolved": "https://registry.npmjs.org/through2/-/through2-3.0.1.tgz",
-          "integrity": "sha512-M96dvTalPT3YbYLaKaCuwu+j06D/8Jfib0o/PxbVt6Amhv3dUAtW6rTV1jPgJSBG83I/e04Y6xkVdVhSRhi0ww==",
-          "requires": {
-            "readable-stream": "2 || 3"
-          }
-        }
-      }
-    },
     "gulp-pandoc": {
       "version": "0.2.2",
       "resolved": "https://registry.npmjs.org/gulp-pandoc/-/gulp-pandoc-0.2.2.tgz",
@@ -4075,6 +4044,17 @@
         "remove-bom-buffer": "^3.0.0",
         "safe-buffer": "^5.1.0",
         "through2": "^2.0.3"
+      },
+      "dependencies": {
+        "through2": {
+          "version": "2.0.5",
+          "resolved": "https://registry.npmjs.org/through2/-/through2-2.0.5.tgz",
+          "integrity": "sha512-/mrRod8xqpA+IHSLyGCQ2s8SPHiCDEeQJSep1jqLYeEUClOFG2Qsh+4FU6G9VeqpZnGW/Su8LQGc4YKni5rYSQ==",
+          "requires": {
+            "readable-stream": "~2.3.6",
+            "xtend": "~4.0.1"
+          }
+        }
       }
     },
     "remove-trailing-separator": {
@@ -4638,12 +4618,11 @@
       }
     },
     "through2": {
-      "version": "2.0.5",
-      "resolved": "https://registry.npmjs.org/through2/-/through2-2.0.5.tgz",
-      "integrity": "sha512-/mrRod8xqpA+IHSLyGCQ2s8SPHiCDEeQJSep1jqLYeEUClOFG2Qsh+4FU6G9VeqpZnGW/Su8LQGc4YKni5rYSQ==",
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/through2/-/through2-3.0.1.tgz",
+      "integrity": "sha512-M96dvTalPT3YbYLaKaCuwu+j06D/8Jfib0o/PxbVt6Amhv3dUAtW6rTV1jPgJSBG83I/e04Y6xkVdVhSRhi0ww==",
       "requires": {
-        "readable-stream": "~2.3.6",
-        "xtend": "~4.0.1"
+        "readable-stream": "2 || 3"
       }
     },
     "through2-filter": {
@@ -4653,6 +4632,17 @@
       "requires": {
         "through2": "~2.0.0",
         "xtend": "~4.0.0"
+      },
+      "dependencies": {
+        "through2": {
+          "version": "2.0.5",
+          "resolved": "https://registry.npmjs.org/through2/-/through2-2.0.5.tgz",
+          "integrity": "sha512-/mrRod8xqpA+IHSLyGCQ2s8SPHiCDEeQJSep1jqLYeEUClOFG2Qsh+4FU6G9VeqpZnGW/Su8LQGc4YKni5rYSQ==",
+          "requires": {
+            "readable-stream": "~2.3.6",
+            "xtend": "~4.0.1"
+          }
+        }
       }
     },
     "time-stamp": {
@@ -4718,6 +4708,17 @@
       "integrity": "sha1-/JKtq6ByZHvAtn1rA2ZKoZUJOvY=",
       "requires": {
         "through2": "^2.0.3"
+      },
+      "dependencies": {
+        "through2": {
+          "version": "2.0.5",
+          "resolved": "https://registry.npmjs.org/through2/-/through2-2.0.5.tgz",
+          "integrity": "sha512-/mrRod8xqpA+IHSLyGCQ2s8SPHiCDEeQJSep1jqLYeEUClOFG2Qsh+4FU6G9VeqpZnGW/Su8LQGc4YKni5rYSQ==",
+          "requires": {
+            "readable-stream": "~2.3.6",
+            "xtend": "~4.0.1"
+          }
+        }
       }
     },
     "trim-newlines": {
@@ -4899,6 +4900,17 @@
         "value-or-function": "^3.0.0",
         "vinyl": "^2.0.0",
         "vinyl-sourcemap": "^1.1.0"
+      },
+      "dependencies": {
+        "through2": {
+          "version": "2.0.5",
+          "resolved": "https://registry.npmjs.org/through2/-/through2-2.0.5.tgz",
+          "integrity": "sha512-/mrRod8xqpA+IHSLyGCQ2s8SPHiCDEeQJSep1jqLYeEUClOFG2Qsh+4FU6G9VeqpZnGW/Su8LQGc4YKni5rYSQ==",
+          "requires": {
+            "readable-stream": "~2.3.6",
+            "xtend": "~4.0.1"
+          }
+        }
       }
     },
     "vinyl-sourcemap": {

package.json

@@ -15,9 +15,11 @@
   "dependencies": {
     "del": "^5.1.0",
     "gulp": "^4.0.2",
-    "gulp-exec": "^4.0.0",
     "gulp-pandoc": "^0.2.2",
-    "gulp-server-livereload": "^1.9.2"
+    "gulp-server-livereload": "^1.9.2",
+    "plugin-error": "^1.0.1",
+    "through2": "^3.0.1",
+    "vinyl": "^2.2.0"
   },
   "devDependencies": {
     "prettier": "^2.0.5"