diff --git a/_atest.md b/_atest.md
new file mode 100644
index 0000000..66ad4a2
--- /dev/null
+++ b/_atest.md
@@ -0,0 +1 @@
+WILL BE SEEN IN FINAL OUTPUT!
diff --git a/_index.md b/_index.md
index a17b154..6c02fce 100644
--- a/_index.md
+++ b/_index.md
@@ -1 +1 @@
-This content will go on the homepage.
+_This content will go on the homepage._
diff --git a/_site.ori b/_site.ori
deleted file mode 100644
index 05f533c..0000000
--- a/_site.ori
+++ /dev/null
@@ -1,49 +0,0 @@
-(all) => {
-  //put the file selection part in a closure, so that the list of all files is kept private.
-  pages: {
-    /*
-    list is all the files in current directory.
-    allfiles is all source files: ending with `.md` and not starting with `_`.
-    pubfiles is the subset containing the string `_pub`.
-    files selects either of these depending on the argument passed to this file.
-    */
-  //  allfiles: allfiles.sh() //reads MD files.
-  //  pubfiles: pubfiles.sh(allfiles)
-    (list): ..
-    allfiles: Tree.filter(list, (val, key) => key.endsWith('.md') && !key.startsWith('_'))
-    pubfiles: Tree.filter(allfiles, (val, key) => key.includes('_pub'))
-    files: Tree.map( all ? allfiles : pubfiles, {value: (val) => Origami.document(val)})
-    asHtml: Tree.map(files, (value) => Origami.mdHtml(value))
-          → (values) => Tree.mapExtension(values, '.md→.html')
-
-  /*
-  after converting to html, we can extract a 'summary' from the file.
-  With markdown, the title is taken from the YAML frontmatter,
-  and ends up in a separate field of the document.
-  So we dont have to worry about the title being part of the summary.
-  */
-  withSummary: Tree.map(asHtml, extractSummary.js)
-
-  /*
-  Removing private content coming below the html comment `<!--private-below-->`
-  Only remove this if in public mode. So if this file is called as `site.ori("all")`,
-  then final output is `withSummary`, otherwise it's `privateRemoved`.
-  */
-  privateRemoved: Tree.map(withSummary, removePrivate.js)
-  final: (all ? withSummary : privateRemoved)
-  
-  }.final
-
-  renderedPages: Tree.map(pages, page.ori)
-
-  /*
-  assets are relative to the pubfiles directory
-  */
-  css
-
-  /*
-  Now, I think I have enough to build both the individual pages and the index page!
-  */
-  index.html: indexPage.ori(pages)
-  ...renderedPages/
-}
diff --git a/addFilenameData.js b/addFilenameData.js
new file mode 100644
index 0000000..624db14
--- /dev/null
+++ b/addFilenameData.js
@@ -0,0 +1,6 @@
+import {parse} from './filenameparser.js';
+
+export default (value, key) => {
+  const fnd = parse(key);
+  return {...value, fnd};
+}
diff --git a/filenameparser.js b/filenameparser.js
new file mode 100644
index 0000000..ab164df
--- /dev/null
+++ b/filenameparser.js
@@ -0,0 +1,728 @@
+// @generated by Peggy 5.1.0.
+//
+// https://peggyjs.org/
+
+
+class peg$SyntaxError extends SyntaxError {
+  constructor(message, expected, found, location) {
+    super(message);
+    this.expected = expected;
+    this.found = found;
+    this.location = location;
+    this.name = "SyntaxError";
+  }
+
+  format(sources) {
+    let str = "Error: " + this.message;
+    if (this.location) {
+      let src = null;
+      const st = sources.find(s => s.source === this.location.source);
+      if (st) {
+        src = st.text.split(/\r\n|\n|\r/g);
+      }
+      const s = this.location.start;
+      const offset_s = (this.location.source && (typeof this.location.source.offset === "function"))
+        ? this.location.source.offset(s)
+        : s;
+      const loc = this.location.source + ":" + offset_s.line + ":" + offset_s.column;
+      if (src) {
+        const e = this.location.end;
+        const filler = "".padEnd(offset_s.line.toString().length, " ");
+        const line = src[s.line - 1];
+        const last = s.line === e.line ? e.column : line.length + 1;
+        const hatLen = (last - s.column) || 1;
+        str += "\n --> " + loc + "\n"
+            + filler + " |\n"
+            + offset_s.line + " | " + line + "\n"
+            + filler + " | " + "".padEnd(s.column - 1, " ")
+            + "".padEnd(hatLen, "^");
+      } else {
+        str += "\n at " + loc;
+      }
+    }
+    return str;
+  }
+
+  static buildMessage(expected, found) {
+    function hex(ch) {
+      return ch.codePointAt(0).toString(16).toUpperCase();
+    }
+
+    const nonPrintable = Object.prototype.hasOwnProperty.call(RegExp.prototype, "unicode")
+      ? new RegExp("[\\p{C}\\p{Mn}\\p{Mc}]", "gu")
+      : null;
+    function unicodeEscape(s) {
+      if (nonPrintable) {
+        return s.replace(nonPrintable,  ch => "\\u{" + hex(ch) + "}");
+      }
+      return s;
+    }
+
+    function literalEscape(s) {
+      return unicodeEscape(s
+        .replace(/\\/g, "\\\\")
+        .replace(/"/g,  "\\\"")
+        .replace(/\0/g, "\\0")
+        .replace(/\t/g, "\\t")
+        .replace(/\n/g, "\\n")
+        .replace(/\r/g, "\\r")
+        .replace(/[\x00-\x0F]/g,          ch => "\\x0" + hex(ch))
+        .replace(/[\x10-\x1F\x7F-\x9F]/g, ch => "\\x"  + hex(ch)));
+    }
+
+    function classEscape(s) {
+      return unicodeEscape(s
+        .replace(/\\/g, "\\\\")
+        .replace(/\]/g, "\\]")
+        .replace(/\^/g, "\\^")
+        .replace(/-/g,  "\\-")
+        .replace(/\0/g, "\\0")
+        .replace(/\t/g, "\\t")
+        .replace(/\n/g, "\\n")
+        .replace(/\r/g, "\\r")
+        .replace(/[\x00-\x0F]/g,          ch => "\\x0" + hex(ch))
+        .replace(/[\x10-\x1F\x7F-\x9F]/g, ch => "\\x"  + hex(ch)));
+    }
+
+    const DESCRIBE_EXPECTATION_FNS = {
+      literal(expectation) {
+        return "\"" + literalEscape(expectation.text) + "\"";
+      },
+
+      class(expectation) {
+        const escapedParts = expectation.parts.map(
+          part => (Array.isArray(part)
+            ? classEscape(part[0]) + "-" + classEscape(part[1])
+            : classEscape(part))
+        );
+
+        return "[" + (expectation.inverted ? "^" : "") + escapedParts.join("") + "]" + (expectation.unicode ? "u" : "");
+      },
+
+      any() {
+        return "any character";
+      },
+
+      end() {
+        return "end of input";
+      },
+
+      other(expectation) {
+        return expectation.description;
+      },
+    };
+
+    function describeExpectation(expectation) {
+      return DESCRIBE_EXPECTATION_FNS[expectation.type](expectation);
+    }
+
+    function describeExpected(expected) {
+      const descriptions = expected.map(describeExpectation);
+      descriptions.sort();
+
+      if (descriptions.length > 0) {
+        let j = 1;
+        for (let i = 1; i < descriptions.length; i++) {
+          if (descriptions[i - 1] !== descriptions[i]) {
+            descriptions[j] = descriptions[i];
+            j++;
+          }
+        }
+        descriptions.length = j;
+      }
+
+      switch (descriptions.length) {
+        case 1:
+          return descriptions[0];
+
+        case 2:
+          return descriptions[0] + " or " + descriptions[1];
+
+        default:
+          return descriptions.slice(0, -1).join(", ")
+            + ", or "
+            + descriptions[descriptions.length - 1];
+      }
+    }
+
+    function describeFound(found) {
+      return found ? "\"" + literalEscape(found) + "\"" : "end of input";
+    }
+
+    return "Expected " + describeExpected(expected) + " but " + describeFound(found) + " found.";
+  }
+}
+
+function peg$parse(input, options) {
+  options = options !== undefined ? options : {};
+
+  const peg$FAILED = {};
+  const peg$source = options.grammarSource;
+
+  const peg$startRuleFunctions = {
+    line: peg$parseline,
+  };
+  let peg$startRuleFunction = peg$parseline;
+
+  const peg$c0 = ".";
+  const peg$c1 = ":";
+  const peg$c2 = "_";
+
+  const peg$r0 = /^[a-z0-9]/;
+  const peg$r1 = /^[^:.]/;
+  const peg$r2 = /^[a-p]/;
+  const peg$r3 = /^[^_.]/i;
+
+  const peg$e0 = peg$literalExpectation(".", false);
+  const peg$e1 = peg$classExpectation([["a", "z"], ["0", "9"]], false, false, false);
+  const peg$e2 = peg$literalExpectation(":", false);
+  const peg$e3 = peg$classExpectation([":", "."], true, false, false);
+  const peg$e4 = peg$classExpectation([["a", "p"]], false, false, false);
+  const peg$e5 = peg$classExpectation(["_", "."], true, true, false);
+  const peg$e6 = peg$literalExpectation("_", false);
+
+  function peg$f0(addr, name, tags, ext) {return {
+	addr: addr.value,
+    name: name.value,
+    tags: tags?.tags,
+    ext: ext.value
+}  }
+  function peg$f1(value) {return {type: "extension", value}  }
+  function peg$f2(tags) {return {type: "tags", tags}  }
+  function peg$f3(value) {return {type: "address", value}  }
+  function peg$f4(value) {return {type: "name", value}  }
+  let peg$currPos = options.peg$currPos | 0;
+  let peg$savedPos = peg$currPos;
+  const peg$posDetailsCache = [{ line: 1, column: 1 }];
+  let peg$maxFailPos = peg$currPos;
+  let peg$maxFailExpected = options.peg$maxFailExpected || [];
+  let peg$silentFails = options.peg$silentFails | 0;
+
+  let peg$result;
+
+  if (options.startRule) {
+    if (!(options.startRule in peg$startRuleFunctions)) {
+      throw new Error("Can't start parsing from rule \"" + options.startRule + "\".");
+    }
+
+    peg$startRuleFunction = peg$startRuleFunctions[options.startRule];
+  }
+
+  function text() {
+    return input.substring(peg$savedPos, peg$currPos);
+  }
+
+  function offset() {
+    return peg$savedPos;
+  }
+
+  function range() {
+    return {
+      source: peg$source,
+      start: peg$savedPos,
+      end: peg$currPos,
+    };
+  }
+
+  function location() {
+    return peg$computeLocation(peg$savedPos, peg$currPos);
+  }
+
+  function expected(description, location) {
+    location = location !== undefined
+      ? location
+      : peg$computeLocation(peg$savedPos, peg$currPos);
+
+    throw peg$buildStructuredError(
+      [peg$otherExpectation(description)],
+      input.substring(peg$savedPos, peg$currPos),
+      location
+    );
+  }
+
+  function error(message, location) {
+    location = location !== undefined
+      ? location
+      : peg$computeLocation(peg$savedPos, peg$currPos);
+
+    throw peg$buildSimpleError(message, location);
+  }
+
+  function peg$getUnicode(pos = peg$currPos) {
+    const cp = input.codePointAt(pos);
+    if (cp === undefined) {
+      return "";
+    }
+    return String.fromCodePoint(cp);
+  }
+
+  function peg$literalExpectation(text, ignoreCase) {
+    return { type: "literal", text, ignoreCase };
+  }
+
+  function peg$classExpectation(parts, inverted, ignoreCase, unicode) {
+    return { type: "class", parts, inverted, ignoreCase, unicode };
+  }
+
+  function peg$anyExpectation() {
+    return { type: "any" };
+  }
+
+  function peg$endExpectation() {
+    return { type: "end" };
+  }
+
+  function peg$otherExpectation(description) {
+    return { type: "other", description };
+  }
+
+  function peg$computePosDetails(pos) {
+    let details = peg$posDetailsCache[pos];
+    let p;
+
+    if (details) {
+      return details;
+    } else {
+      if (pos >= peg$posDetailsCache.length) {
+        p = peg$posDetailsCache.length - 1;
+      } else {
+        p = pos;
+        while (!peg$posDetailsCache[--p]) {}
+      }
+
+      details = peg$posDetailsCache[p];
+      details = {
+        line: details.line,
+        column: details.column,
+      };
+
+      while (p < pos) {
+        if (input.charCodeAt(p) === 10) {
+          details.line++;
+          details.column = 1;
+        } else {
+          details.column++;
+        }
+
+        p++;
+      }
+
+      peg$posDetailsCache[pos] = details;
+
+      return details;
+    }
+  }
+
+  function peg$computeLocation(startPos, endPos, offset) {
+    const startPosDetails = peg$computePosDetails(startPos);
+    const endPosDetails = peg$computePosDetails(endPos);
+
+    const res = {
+      source: peg$source,
+      start: {
+        offset: startPos,
+        line: startPosDetails.line,
+        column: startPosDetails.column,
+      },
+      end: {
+        offset: endPos,
+        line: endPosDetails.line,
+        column: endPosDetails.column,
+      },
+    };
+    if (offset && peg$source && (typeof peg$source.offset === "function")) {
+      res.start = peg$source.offset(res.start);
+      res.end = peg$source.offset(res.end);
+    }
+    return res;
+  }
+
+  function peg$fail(expected) {
+    if (peg$currPos < peg$maxFailPos) { return; }
+
+    if (peg$currPos > peg$maxFailPos) {
+      peg$maxFailPos = peg$currPos;
+      peg$maxFailExpected = [];
+    }
+
+    peg$maxFailExpected.push(expected);
+  }
+
+  function peg$buildSimpleError(message, location) {
+    return new peg$SyntaxError(message, null, null, location);
+  }
+
+  function peg$buildStructuredError(expected, found, location) {
+    return new peg$SyntaxError(
+      peg$SyntaxError.buildMessage(expected, found),
+      expected,
+      found,
+      location
+    );
+  }
+
+  function peg$parseline() {
+    let s0, s1, s2, s3, s4;
+
+    s0 = peg$currPos;
+    s1 = peg$parseaddr();
+    if (s1 !== peg$FAILED) {
+      s2 = peg$parsename();
+      if (s2 !== peg$FAILED) {
+        s3 = peg$parsetags();
+        if (s3 === peg$FAILED) {
+          s3 = null;
+        }
+        s4 = peg$parseext();
+        if (s4 !== peg$FAILED) {
+          peg$savedPos = s0;
+          s0 = peg$f0(s1, s2, s3, s4);
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parseext() {
+    let s0, s1, s2, s3, s4, s5, s6;
+
+    s0 = peg$currPos;
+    s1 = peg$currPos;
+    s2 = [];
+    s3 = peg$currPos;
+    if (input.charCodeAt(peg$currPos) === 46) {
+      s4 = peg$c0;
+      peg$currPos++;
+    } else {
+      s4 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e0); }
+    }
+    if (s4 !== peg$FAILED) {
+      s5 = [];
+      s6 = input.charAt(peg$currPos);
+      if (peg$r0.test(s6)) {
+        peg$currPos++;
+      } else {
+        s6 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$e1); }
+      }
+      if (s6 !== peg$FAILED) {
+        while (s6 !== peg$FAILED) {
+          s5.push(s6);
+          s6 = input.charAt(peg$currPos);
+          if (peg$r0.test(s6)) {
+            peg$currPos++;
+          } else {
+            s6 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$e1); }
+          }
+        }
+      } else {
+        s5 = peg$FAILED;
+      }
+      if (s5 !== peg$FAILED) {
+        s4 = [s4, s5];
+        s3 = s4;
+      } else {
+        peg$currPos = s3;
+        s3 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s3;
+      s3 = peg$FAILED;
+    }
+    if (s3 !== peg$FAILED) {
+      while (s3 !== peg$FAILED) {
+        s2.push(s3);
+        s3 = peg$currPos;
+        if (input.charCodeAt(peg$currPos) === 46) {
+          s4 = peg$c0;
+          peg$currPos++;
+        } else {
+          s4 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$e0); }
+        }
+        if (s4 !== peg$FAILED) {
+          s5 = [];
+          s6 = input.charAt(peg$currPos);
+          if (peg$r0.test(s6)) {
+            peg$currPos++;
+          } else {
+            s6 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$e1); }
+          }
+          if (s6 !== peg$FAILED) {
+            while (s6 !== peg$FAILED) {
+              s5.push(s6);
+              s6 = input.charAt(peg$currPos);
+              if (peg$r0.test(s6)) {
+                peg$currPos++;
+              } else {
+                s6 = peg$FAILED;
+                if (peg$silentFails === 0) { peg$fail(peg$e1); }
+              }
+            }
+          } else {
+            s5 = peg$FAILED;
+          }
+          if (s5 !== peg$FAILED) {
+            s4 = [s4, s5];
+            s3 = s4;
+          } else {
+            peg$currPos = s3;
+            s3 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s3;
+          s3 = peg$FAILED;
+        }
+      }
+    } else {
+      s2 = peg$FAILED;
+    }
+    if (s2 !== peg$FAILED) {
+      s1 = input.substring(s1, peg$currPos);
+    } else {
+      s1 = s2;
+    }
+    if (s1 !== peg$FAILED) {
+      peg$savedPos = s0;
+      s1 = peg$f1(s1);
+    }
+    s0 = s1;
+
+    return s0;
+  }
+
+  function peg$parsetags() {
+    let s0, s1, s2, s3, s4;
+
+    s0 = peg$currPos;
+    s1 = peg$parse_();
+    if (s1 !== peg$FAILED) {
+      s2 = [];
+      s3 = peg$parsetag();
+      while (s3 !== peg$FAILED) {
+        s2.push(s3);
+        s3 = peg$currPos;
+        if (input.charCodeAt(peg$currPos) === 58) {
+          s4 = peg$c1;
+          peg$currPos++;
+        } else {
+          s4 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$e2); }
+        }
+        if (s4 !== peg$FAILED) {
+          s4 = peg$parsetag();
+          if (s4 === peg$FAILED) {
+            peg$currPos = s3;
+            s3 = peg$FAILED;
+          } else {
+            s3 = s4;
+          }
+        } else {
+          s3 = s4;
+        }
+      }
+      peg$savedPos = s0;
+      s0 = peg$f2(s2);
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parsetag() {
+    let s0, s1, s2;
+
+    s0 = peg$currPos;
+    s1 = [];
+    s2 = input.charAt(peg$currPos);
+    if (peg$r1.test(s2)) {
+      peg$currPos++;
+    } else {
+      s2 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e3); }
+    }
+    if (s2 !== peg$FAILED) {
+      while (s2 !== peg$FAILED) {
+        s1.push(s2);
+        s2 = input.charAt(peg$currPos);
+        if (peg$r1.test(s2)) {
+          peg$currPos++;
+        } else {
+          s2 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$e3); }
+        }
+      }
+    } else {
+      s1 = peg$FAILED;
+    }
+    if (s1 !== peg$FAILED) {
+      s0 = input.substring(s0, peg$currPos);
+    } else {
+      s0 = s1;
+    }
+
+    return s0;
+  }
+
+  function peg$parseaddr() {
+    let s0, s1, s2, s3;
+
+    s0 = peg$currPos;
+    s1 = peg$currPos;
+    s2 = [];
+    s3 = input.charAt(peg$currPos);
+    if (peg$r2.test(s3)) {
+      peg$currPos++;
+    } else {
+      s3 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e4); }
+    }
+    if (s3 !== peg$FAILED) {
+      while (s3 !== peg$FAILED) {
+        s2.push(s3);
+        s3 = input.charAt(peg$currPos);
+        if (peg$r2.test(s3)) {
+          peg$currPos++;
+        } else {
+          s3 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$e4); }
+        }
+      }
+    } else {
+      s2 = peg$FAILED;
+    }
+    if (s2 !== peg$FAILED) {
+      s1 = input.substring(s1, peg$currPos);
+    } else {
+      s1 = s2;
+    }
+    if (s1 !== peg$FAILED) {
+      peg$savedPos = s0;
+      s1 = peg$f3(s1);
+    }
+    s0 = s1;
+
+    return s0;
+  }
+
+  function peg$parsename() {
+    let s0, s1, s2, s3, s4;
+
+    s0 = peg$currPos;
+    s1 = peg$parse_();
+    if (s1 !== peg$FAILED) {
+      s2 = peg$currPos;
+      s3 = [];
+      s4 = input.charAt(peg$currPos);
+      if (peg$r3.test(s4)) {
+        peg$currPos++;
+      } else {
+        s4 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$e5); }
+      }
+      if (s4 !== peg$FAILED) {
+        while (s4 !== peg$FAILED) {
+          s3.push(s4);
+          s4 = input.charAt(peg$currPos);
+          if (peg$r3.test(s4)) {
+            peg$currPos++;
+          } else {
+            s4 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$e5); }
+          }
+        }
+      } else {
+        s3 = peg$FAILED;
+      }
+      if (s3 !== peg$FAILED) {
+        s2 = input.substring(s2, peg$currPos);
+      } else {
+        s2 = s3;
+      }
+      if (s2 !== peg$FAILED) {
+        peg$savedPos = s0;
+        s0 = peg$f4(s2);
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parse_() {
+    let s0;
+
+    if (input.charCodeAt(peg$currPos) === 95) {
+      s0 = peg$c2;
+      peg$currPos++;
+    } else {
+      s0 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e6); }
+    }
+
+    return s0;
+  }
+
+  peg$result = peg$startRuleFunction();
+
+  const peg$success = (peg$result !== peg$FAILED && peg$currPos === input.length);
+  function peg$throw() {
+    if (peg$result !== peg$FAILED && peg$currPos < input.length) {
+      peg$fail(peg$endExpectation());
+    }
+
+    throw peg$buildStructuredError(
+      peg$maxFailExpected,
+      peg$maxFailPos < input.length ? peg$getUnicode(peg$maxFailPos) : null,
+      peg$maxFailPos < input.length
+        ? peg$computeLocation(peg$maxFailPos, peg$maxFailPos + 1)
+        : peg$computeLocation(peg$maxFailPos, peg$maxFailPos)
+    );
+  }
+  if (options.peg$library) {
+    return /** @type {any} */ ({
+      peg$result,
+      peg$currPos,
+      peg$FAILED,
+      peg$maxFailExpected,
+      peg$maxFailPos,
+      peg$success,
+      peg$throw: peg$success ? undefined : peg$throw,
+    });
+  }
+  if (peg$success) {
+    return peg$result;
+  } else {
+    peg$throw();
+  }
+}
+
+const peg$allowedStartRules = [
+  "line"
+];
+
+export {
+  peg$allowedStartRules as StartRules,
+  peg$SyntaxError as SyntaxError,
+  peg$parse as parse
+};
diff --git a/filenameparser.pegjs b/filenameparser.pegjs
new file mode 100644
index 0000000..4efe4d8
--- /dev/null
+++ b/filenameparser.pegjs
@@ -0,0 +1,24 @@
+/*
+filename syntax: addr_filename[_colon:separated:tags].ext[.ext]
+addr: sequence of one or more a-p. String.
+filename: anything except underscore or period. String.
+tags: colon-separated list of tags. Array of Strings.
+ext: period, then a-z0-9. Multiple allowed. String, including periods.
+*/
+line = addr:addr name:name tags:tags? ext:ext {return {
+	addr: addr.value,
+    name: name.value,
+    tags: tags?.tags,
+    ext: ext.value
+}}
+ext = value:$(("." [a-z0-9]+))+ {return {type: "extension", value}}
+
+//tags are separated by colon to allow dashes in values for e.g. dates.
+tags = _ tags:tag|..,":"| {return {type: "tags", tags}}
+tag = $[^:.]+
+addr = value:$[a-p]+ {return {type: "address", value}}
+
+//a limitation: filenames may not contain periods.
+//Otherwise it gets more complicated to handle extensions.
+name = _ value:$[^_.]i+ {return {type: "name", value}}
+_ = "_"
diff --git a/site.ori b/site.ori
index a2eff33..6d23e85 100644
--- a/site.ori
+++ b/site.ori
@@ -1,14 +1,65 @@
 (all) => {
-  /*
-  list is all the files in current directory.
-  allfiles: ending with `.md` and not starting with `_`.
-  pubfiles: the subset containing the string `_pub`.
-  files selects either of these depending on the argument passed to this file.
-  */
-  (list): ..
-  allfiles: Tree.filter(list,
-    (val, key) => key.endsWith('.md') && !key.startsWith('_'))
-  pubfiles: Tree.filter(allfiles,
-    (val, key) => key.includes('_pub'))
+  //put the file selection part in a closure, so that the list of all files is kept private.
+  pages: {
+    /*
+      list is all the files in current directory.
+      allfiles is all source files: ending with `.md` and not starting with `_`.
+      pubfiles is the subset containing the string `_pub`.
+      files selects either of these depending on the argument passed to this file.
 
+    NOTES:
+
+    - if markdown files are empty, Origami.document() will error.
+    */
+
+    /*
+      this is the external filename method. 
+    */
+  //  allfiles: allfiles.sh() //reads MD files.
+  //  pubfiles: pubfiles.sh(allfiles)
+    (list): ..
+    allfiles: Tree.filter(list, (val, key) => key.endsWith('.md') && !key.startsWith('_'))
+      → (items) => Tree.map(items, {value: (value) => Origami.document(value)}) //if I don't use the verbose syntax I get the filename characters as part of value!
+      → (items) => Tree.map(items, { value: (value, key) => addFilenameData.js(value, key)})
+
+    pubfiles: Tree.filter(allfiles, (val, key) => val.fnd.tags?.includes('pub'))
+
+    /*
+      Now convert to html.
+    */
+    asHtml: Tree.map(all ? allfiles: pubfiles, {
+      value: (value) => Origami.mdHtml(value)
+      key: (value, key) => `${value.fnd.name}.html`
+    })
+
+    /*
+    after converting to html, we can extract a 'summary' from the file.
+    With markdown, the title is taken from the YAML frontmatter,
+    and ends up in a separate field of the document.
+    So we dont have to worry about the title being part of the summary.
+    */
+    withSummary: Tree.map(asHtml, extractSummary.js)
+
+    /*
+    Removing private content coming below the html comment `<!--private-below-->`
+    Only remove this if in public mode. So if this file is called as `site.ori("all")`,
+    then final output is `withSummary`, otherwise it's `privateRemoved`.
+    */
+    privateRemoved: Tree.map(withSummary, removePrivate.js)
+    final: (all ? withSummary : privateRemoved)
+  
+  }.final
+
+  renderedPages: Tree.map(pages, page.ori)
+
+  /*
+  assets are relative to the pubfiles directory
+  */
+  css
+
+  /*
+  Now, I think I have enough to build both the individual pages and the index page!
+  */
+  index.html: indexPage.ori(pages)
+  ...renderedPages/
 }