From f3f1f5e7a7cb23230d623b02773b75ea997ea241 Mon Sep 17 00:00:00 2001
From: Viktor Kleen <viktor@kleen.org>
Date: Fri, 2 Jan 2015 14:50:48 +0000
Subject: Implement previews of lists in the index

---
 .gitignore          |  1 +
 index.md.do         |  7 +++++--
 lists/default.md.do | 20 ++++++++++++++++++--
 3 files changed, 24 insertions(+), 4 deletions(-)

diff --git a/.gitignore b/.gitignore
index 210a8d7..22ca4e4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,4 +9,5 @@ nginx
 *.html
 index.md
 lists/*.md
+lists/*/preview
 tex/
\ No newline at end of file
diff --git a/index.md.do b/index.md.do
index 3b6eddd..d7c76d2 100644
--- a/index.md.do
+++ b/index.md.do
@@ -23,8 +23,8 @@ This site is supposed to serve as a research notebook to get me to write up
 ideas and results. As such, it is woefully unpolished, unreliably and generally
 to be used at your own risk.
 
-Still, have fun! And please send me [email](mailto:vkleen+math@17220103.de) with
-suggestions, corrections, criticism or general rants if you like.
+Still, have fun! And please send email with suggestions, corrections,
+criticism or general rants to <vkleen+math@17220103.de> if you like.
 
 I have the following categories of posts:
 
@@ -32,4 +32,7 @@ EOF
 
 for x in "${LISTS[@]}"; do
     printf "* [%s](%s)\n" "$(<$x/title)" "$x.html"
+    while read -r -d $'\n'; do
+        printf "    %s" "$REPLY"
+    done < "$x/preview"
 done
diff --git a/lists/default.md.do b/lists/default.md.do
index 94636df..daf7453 100644
--- a/lists/default.md.do
+++ b/lists/default.md.do
@@ -5,7 +5,7 @@ POSTS=()
 while read -r -d $'\0'; do
     post=$(realpath --relative-to=. "$REPLY")
     POSTS+=("$post")
-done < <(find "$2" -maxdepth 1 -mindepth 1 -not -name 'title' -print0 | sort -z)
+done < <(find "$2" -maxdepth 1 -mindepth 1 -not -name 'title' -not -name 'preview' -print0 | sort -z)
 
 for x in "${POSTS[@]}"; do
     printf "%s\0%s\0" "$x" "${x%.md}.html"
@@ -18,7 +18,23 @@ cat <<EOF
 
 EOF
 
+POST_TITLES=()
 for x in "${POSTS[@]}"; do
     title=$(pandoc -t json "$x" | ../build/extract-title.hs 2>&1 >/dev/null)
-    printf "* [%s](%s)\n" "$title" "${x%.md}.html"
+    POST_TITLES+=("$title")
+done
+
+for n in $(seq 0 $((${#POSTS[@]}-1))); do
+    printf "* [%s](%s)\n" "${POST_TITLES[$n]}" "${POSTS[$n]%.md}.html"
+done
+
+prev_no=3
+if [[ ${#POSTS[@]} -gt $prev_no ]]; then
+    printf "* …\n" > "$2/preview"
+else
+    prev_no=${#POSTS[@]}
+fi
+
+for n in $(seq $prev_no -1 1); do
+    printf "* [%s](%s)\n" "${POST_TITLES[-$n]}" "${POSTS[-$n]%.md}.html" >"$2/preview"
 done
-- 
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