Use filename as fallback for date

Why:

 * when migrating from systems like jekylla and awestruct to hugo
   you might have hundreds if not thousands of blog entries using the
   filename as a way to set the date and slug part of page.
   i.e. 2017-08-01-my-life-as-a-dog.md would have a date of 2017-08-01 and
   a url called my-life-as-a-dog.md.

This change addreses the need by:

 * introduce a setting called `useFilenameDateAsFallback` that defaults to true,
   which will derive date and slug from the filename.
 * fix bug where adjusting metadata defaults were ignored when page has no frontmatter

docs/content/getting-started/configuration.md

@@ -245,10 +245,6 @@ disablePathToLower =          false
 enableEmoji =                 false
 # Show a placeholder instead of the default value or an empty string if a translation is missing
 enableMissingTranslationPlaceholders = false
-# Regex to use for dates in filenames.
-filenameDateFallbackPattern = "(?P<year>\\d{4})\\-(?P<month>\\d{2})\\-(?P<day>\\d{2})"
-# Time format for custom dates in filenames. Only used with `useFilenameDateAsFallback` and must match `filenameDateFallbackPattern`
-filenameDateFallbackFormat = "2006-01-02"
 footnoteAnchorPrefix =        ""
 footnoteReturnLinkContents =  ""
 # google analytics tracking id
@@ -302,8 +298,8 @@ theme =                       ""
 title =                       ""
 # if true, use /filename.html instead of /filename/
 uglyURLs =                    false
-#if true, use dates in filenames e.g. 2017-01-31-mypostname.md
-useFilenameDateAsFallback =  false
+# use dates in filenames e.g. 2017-01-31-mypostname.md
+useFilenameDateAsFallback =  true
 # verbose output
 verbose =                     false
 # verbose logging

docs/content/variables/page.md

@@ -37,7 +37,11 @@ See [`.Scratch`](/functions/scratch/) for page-scoped, writable variables.
 
 `.Date`
 : the date associated with the page; `.Date` pulls from the `date` field in a content's front matter.
-If you're migrating content to Hugo, you may have content with dates in the filename. For example `2017-01-31-myblog.md`.  You can optionally enable the `useFilenameDateAsFallback` configuration option. This will attempt to parse the datestamp in the filename and use it as a fallback to providing a date variable in the front matter.
+If no `date` field present Hugo will try and extract the date from the filename. For example `2017-01-31-myblog.md`. It will also set `.Slug` to contain the path without the
+date prefix.'
+
+You can disable the automatic date detection and slug modification by setting `useFilenameDateAsFallback` configuration option to false. 
+
 See also `.ExpiryDate`, `.PublishDate`, and `.Lastmod`.
 
 `.Description`

docs/themes/gohugoioTheme/.gitignore

@@ -0,0 +1,4 @@
+src/node_modules
+node_modules
+.DS_Store
+*.log

docs/themes/gohugoioTheme/README.md

@@ -0,0 +1 @@
+Theme for gohugo.io sites. More info to come.

docs/themes/gohugoioTheme/archetypes/default.md

@@ -0,0 +1,13 @@
+---
+linktitle: ""
+description: ""
+godocref: ""
+publishdate: ""
+lastmod: ""
+categories: []
+tags: []
+weight: 00
+slug: ""
+aliases: []
+toc: false
+---

docs/themes/gohugoioTheme/archetypes/functions.md

@@ -0,0 +1,17 @@
+---
+linktitle: ""
+description: ""
+godocref: ""
+publishdate: ""
+lastmod: ""
+categories: [functions]
+tags: []
+ns: ""
+signature: []
+workson: []
+hugoversion: ""
+aliases: []
+relatedfuncs: []
+toc: false
+deprecated: false
+---

docs/themes/gohugoioTheme/archetypes/showcase.md

@@ -0,0 +1,13 @@
+---
+description: ""
+lastmod: ""
+license: ""
+licenseLink: ""
+sitelink: ""
+sourcelink: ""
+categories: [showcase]
+tags: []
+image: ""
+toc: false
+notesforauthors: "Go to gohugo.io/contribute/documentation for more info"
+---

docs/themes/gohugoioTheme/archetypes/tutorials.md

@@ -0,0 +1,16 @@
+---
+linktitle: ""
+description: ""
+godocref: ""
+publishdate: ""
+lastmod: ""
+categories: [tutorials]
+tags: []
+author: ""
+authorurl: ""
+originalurl: ""
+draft: false
+aliases: []
+notesforauthors: "Go to gohugo.io/contribute/documentation for more info."
+---
+

docs/themes/gohugoioTheme/layouts/404.html

@@ -0,0 +1,10 @@
+{{ define "main" }}
+<main class="cf pa5 pa4-l f4 tc center measure-wide lh-copy gray">
+  <h1 class="f3 f2-ns">The page you're looking for doesn't exist. Perhaps you'd like to gopher something else? Sorry.</h1>
+  <div class="h6">
+    {{ partial "svg/gopher-hero.svg" . }}
+  </div>
+
+  {{ .Content }}
+</main>
+{{ end }}

docs/themes/gohugoioTheme/layouts/_default/baseof.html

@@ -0,0 +1,51 @@
+<!DOCTYPE html>
+<html class="no-js" lang="{{ with $.Site.LanguageCode }}{{ . }}{{ else }}en-us{{ end }}">
+  <head>
+    <meta charset="utf-8">
+    {{/* https://www.zachleat.com/web/preload/ */}}
+    <link rel="preload" href="{{ "files/muli-latin-200.woff2" | absURL }}" as="font" type="font/woff2" crossorigin>
+    <link rel="preload" href="{{ "files/muli-latin-400.woff2" | absURL }}" as="font" type="font/woff2" crossorigin>
+    <link rel="preload" href="{{ "files/muli-latin-800.woff2" | absURL }}" as="font" type="font/woff2" crossorigin>
+
+    <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
+     {{/* NOTE: the Site's title, and if there is a page title, that is set too */}}
+    <title>{{ block "title" . }}{{ .Site.Title }} {{ with .Title }} | {{ . }}{{ end }}{{ end }}</title>
+    <meta name="HandheldFriendly" content="True">
+    <meta name="MobileOptimized" content="320">
+
+    <meta name="viewport" content="width=device-width,minimum-scale=1">
+     {{ .Hugo.Generator }}
+
+      {{ if eq (getenv "HUGO_ENV") "production" | or (eq .Site.Params.env "production")  }}
+        <META NAME="ROBOTS" CONTENT="INDEX, FOLLOW">
+      {{ else }}
+        <META NAME="ROBOTS" CONTENT="NOINDEX, NOFOLLOW">
+      {{ end }}
+
+     <link href='{{ "dist/main.css" | relURL }}' rel='stylesheet' type="text/css" />
+      {{- partial "head-additions.html" . -}}
+      {{- template "_internal/opengraph.html" . -}}
+      {{- template "_internal/google_news.html" . -}}
+      {{- template "_internal/schema.html" . -}}
+      {{- partial "twitter_cards.html" . -}}
+
+      {{ if eq (getenv "HUGO_ENV") "production" | or (eq .Site.Params.env "production")  }}
+        {{ template "_internal/google_analytics_async.html" . }}
+      {{ end }}
+
+
+
+
+  </head>
+  <body class="ma0 sans-serif bg-primary-color-light{{ with getenv "HUGO_ENV" }} {{ . }}{{ end }}">
+    {{ block "nav" . }}{{ partial "site-nav.html" . }}{{ end }}
+    {{ block "header" . }}{{ end }}
+    <main role="main" class="content-with-sidebar min-vh-100 pb7 pb0-ns">
+      {{ block "main" . }}{{ end }}
+    </main>
+
+    {{ block "footer" . }}{{ partial "site-footer.html" . }}{{ end }}
+    {{ block "scripts" . }}{{- partial "site-scripts.html" . -}}{{ end }}
+
+  </body>
+</html>

docs/themes/gohugoioTheme/layouts/_default/list.html

@@ -0,0 +1,4 @@
+{{ define "main" }}
+  {{ $section_to_display :=  .Sections | default .Paginator.Pages }}
+  {{ partial "pagelayout.html" (dict "context" . "section_to_display" $section_to_display ) }}
+{{ end }}

docs/themes/gohugoioTheme/layouts/_default/page.html

@@ -0,0 +1,37 @@
+<header class="flex-none w-100">
+  {{ if .Params.categories }}
+    {{ range .Params.categories }}
+      <a href="{{ "/categories/" | relLangURL }}{{ . | urlize }}" class="f6 fw8 mb0 link mid-gray dim mr3">
+        {{ humanize  . | upper }}
+      </a>
+    {{ end }}
+  {{end}}
+  <h1 class="lh-title mb3 mv0 pt3 primary-color-dark">
+    {{- if eq .Section "functions" -}}
+      {{ .LinkTitle }}
+    {{- else -}}
+      {{ .Title }}
+    {{- end -}}
+  </h1>
+</header>
+
+<aside class="bt bw1 pt3 mt2 mid-gray b--mid-gray fn w-100">
+  {{ with .Params.description }}
+    <div class="f4 fw4 lh-copy">
+      {{ . | markdownify }}
+    </div>
+  {{ end }}
+
+  <!--
+  NOTE: Removed to test builds without it.
+  partial "components/author-github-data" (dict "context" . "size" "110") -->
+</aside>
+
+{{ with .Params.featured_image_path }}
+  <img src="{{ . }}" alt="Featured Image for {{ $.Title }}" class="mw-100">
+{{ end }}
+
+<div class="prose" id="prose">
+  {{- partial "docs/functions-signature.html" . -}}
+  {{ .Content }}
+</div>

docs/themes/gohugoioTheme/layouts/_default/single.html

@@ -0,0 +1,30 @@
+{{ define "main" }}
+  <article class="w-100 ph4 pb5 pb6-ns pt1 pt5-ns">
+    <div class="flex-l">
+
+      <div class="order-2 w-100 w-20-l ph5-m ph0-l mb4 sticky">
+      {{- partial "toc.html" . -}}
+      </div>
+
+      <div class="order-1 w-60-l mw7 ph0 ph5-ns mid-gray nested-copy-line-height no-underline nested-links nested-img nested-copy-seperator nested-blockquote mt0-ns" style="flex-grow:1;">
+        <div class="documentation-copy center measure-wide-l">
+          <div id="readout" class="fixed right-0 bottom-0">
+          </div>
+          {{ .Render "page" }}
+        </div>
+      </div>
+      <div class="order-0 w-20 dn db-l">
+        {{ partial "nav-links-docs.html" . }}
+      </div>
+
+    </div>
+  </article>
+
+  <div class="w-100 bg-light-gray">
+    <div class="mw7 pa4 center nested-lh-copy lh-copy">
+      {{ partial "docs/page-meta-data.html" . }}
+      {{ partial "page-edit.html" . }}
+      {{ partial "tags.html" . }}
+    </div>
+  </div>
+{{ end }}

docs/themes/gohugoioTheme/layouts/_default/taxonomy.html

@@ -0,0 +1,4 @@
+{{ define "main" }}
+  {{ $section_to_display :=  .Data.Pages }}
+  {{ partial "pagelayout.html" (dict "context" . "section_to_display" $section_to_display ) }}
+{{ end }}

docs/themes/gohugoioTheme/layouts/_default/terms.html

@@ -0,0 +1,49 @@
+{{/* {{ define "header" }}{{ partial "page-header" . }}{{ end }} */}}
+{{ define "main" }}
+{{ $section_to_display :=  .Data.Pages }}
+<div class="w-100 ph4 pb5 pb6-ns pt1 pt3-ns">
+
+  <div class="flex">
+    <div class="dn db-l w-20">
+        {{ partial "nav-links-docs.html" . }}
+    </div>
+
+    <div class="w-100 w-80-l ph0 ph4-l">
+      <article class="w-100 nested-copy-line-height nested-links nested-img">
+        <h1 class="primary-color-dark f2">
+          {{ .Title }}
+        </h1>
+      </article>
+      <div class="pa3 pa4-ns w-100 v-top column-count-3-l column-gap-1-l">
+          {{ range $key, $value := .Data.Terms }}
+            <div class="break-inside-avoid-l nested-copy-line-height mb5">
+              <h2 class="f3">
+                <a href="{{ "/" | relLangURL }}{{ $.Data.Plural | urlize }}/{{ $key | urlize }}" class="link black hover-blue">
+                  {{ $key }} <span class="f6 gray"> &#8599;</span>
+                </a>
+              </h2>
+              {{ range $value.Pages }}
+                <h3>
+                  <a href="{{ .Permalink }}" class="link blue">
+                    {{ .Title }}
+                  </a>
+                </h3>
+              {{ end }}
+            </div>
+
+          {{ end }}
+
+      </div>
+
+
+
+
+    </div>
+
+  </div>
+
+
+
+
+</div>
+{{ end }}

docs/themes/gohugoioTheme/layouts/index.headers

@@ -0,0 +1,8 @@
+/*
+  X-Frame-Options: DENY
+  X-XSS-Protection: 1; mode=block
+  X-Content-Type-Options: nosniff
+  Referrer-Policy: origin-when-cross-origin
+*/
+  Link: <{{ "dist/app.bundle.js" | relURL }}>; rel=preload; as=script
+  Link: <{{ "dist/main.css" | relURL }}>; rel=preload; as=style

docs/themes/gohugoioTheme/layouts/index.html

@@ -0,0 +1,23 @@
+{{ define "header" }}
+  {{ partial "hero" . }}
+  {{ partial "boxes-small-news" . }}
+{{ end }}
+
+{{ define "main" }}
+
+  <section class="w-100 ph4 ph5-ns pv4">
+    {{- partial "home-page-sections/features-icons" . -}}
+  </section>
+
+  {{- partial "home-page-sections/features-single" . -}}
+
+  <section class="w-100 ph4 ph5-ns pv4 pv6-ns mid-gray bg-white bb bt b--light-gray">
+    {{- partial "home-page-sections/installation" . -}}
+  </section>
+  <section class="w-100 ph4 ph5-ns pv4 pv6-ns mid-gray bg-accent-color-dark">
+    {{- partial "home-page-sections/tweets" . -}}
+  </section>
+  <section class="w-100 ph4 ph5-ns pt4 pb5 mid-gray bg-primary-color-light bb bt b--light-gray ">
+    {{- partial "home-page-sections/open-source-involvement" . -}}
+  </section>
+{{ end }}

docs/themes/gohugoioTheme/layouts/index.redir

@@ -0,0 +1,6 @@
+# Netlify redirects. See https://www.netlify.com/docs/redirects/
+{{  range $p := .Site.Pages -}}
+{{ range .Aliases }}
+{{  . | printf "%-35s" }}	{{ $p.RelPermalink -}}
+{{ end -}}
+{{- end -}}

docs/themes/gohugoioTheme/layouts/news/list.html

@@ -0,0 +1,42 @@
+{{/* TODO: think about adding these tags back in, but they need to be limited to news
+{{ define "header" }}{{ partial "page-header" . }}{{ end }} */}}
+{{ define "main" }}
+<div class="w-100 ph4 ph5-ns pb5 pb6-ns pt1 pt3-ns ">
+
+  <article class="cf pa3 pa4-m pa4-l nested-copy-line-height nested-img">
+    <h1 class="primary-color-dark">
+      {{ .Title }}
+    </h1>
+    <div class="nested-copy-line-height">
+      {{ .Content }}
+    </div>
+  </article>
+
+  <!-- TODO: May be a good idea in this case to add monthly archives -->
+
+  <div class="flex flex-wrap">
+      {{/* [wip] add archive lists
+      <div class="w-100 w-20-ns dn">
+        <ul>
+          <li>
+            <a href="#">
+              archive section
+            </a>
+          </li>
+        </ul>
+      </div> */}}
+
+    {{ $interior_classes := $.Site.Params.flex_box_interior_classes }}
+    <section class="flex-ns flex-wrap justify-between w-100 w-80-nsTK v-top">
+      {{ range .Paginator.Pages }}
+        {{ partial "boxes-section-summaries" (dict "context" . "classes" $interior_classes "fullcontent" false) }}
+      {{ end }}
+    </section>
+  </div>
+  <div class="nested-list-reset nested-links">
+    {{/* pagination.html: https://github.com/gohugoio/hugo/blob/master/tpl/tplimpl/template_embedded.go#L117 */}}
+    {{ template "_internal/pagination.html" . }}
+  </div>
+
+</div>
+{{ end }}