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+#!/bin/sh

+set -euC

+

+# Bail if pandoc is not available.

+if ! command -v pandoc > "/dev/null"

+then

+    exit

+fi

+

+# Find readme.

+file="$(

+    git ls-tree HEAD \

+    | sed 's/^[^\t]\+\t//' \

+    | grep -i '^readme' \

+    | head -n 1

+)"

+if [ -z "$file" ]

+then

+    exit

+fi

+

+# Write the readme to a temporary directory so that pandoc's automatic filetype

+# detection works.

+tmp_dir="$(mktemp -d)"

+trap 'rm -rf "$tmp_dir"' EXIT

+in="$tmp_dir/$(basename "$file")"

+git cat-file blob "HEAD:$file" > "$in"

+

+# `--from` overrides.

+ext="$(printf "%s\n" "${file##*.}" | tr '[:upper:]' '[:lower*]')"

+case "$ext" in

+    *.md|*mkd|*.markdown)

+        from='--from gfm'

+        ;;

+esac

+

+# Run pandoc.

+out="${GIT_DIR:-"$(git rev-parse --git-dir)"}/README.html"

+pandoc ${from:-} --output "$out" "$in"