add toc generator

Author: wojtkowiak

.npmignore

@@ -17,3 +17,4 @@ meteor-desktop.png
 coverage
 .nyc_output
 plugins
+gh-md-toc

gh-md-toc

@@ -0,0 +1,183 @@
+#!/usr/bin/env bash
+
+#
+# Steps:
+#
+#  1. Download corresponding html file for some README.md:
+#       curl -s $1
+#
+#  2. Discard rows where no substring 'user-content-' (github's markup):
+#       awk '/user-content-/ { ...
+#
+#  3.1 Get last number in each row like ' ... </span></a>sitemap.js</h1'.
+#      It's a level of the current header:
+#       substr($0, length($0), 1)
+#
+#  3.2 Get level from 3.1 and insert corresponding number of spaces before '*':
+#       sprintf("%*s", substr($0, length($0), 1)*2, " ")
+#
+#  4. Find head's text and insert it inside "* [ ... ]":
+#       substr($0, match($0, /a>.*<\/h/)+2, RLENGTH-5)
+#
+#  5. Find anchor and insert it inside "(...)":
+#       substr($0, match($0, "href=\"[^\"]+?\" ")+6, RLENGTH-8)
+#
+
+gh_toc_version="0.4.7"
+
+gh_user_agent="gh-md-toc v$gh_toc_version"
+
+#
+# Download rendered into html README.md by its url.
+#
+#
+gh_toc_load() {
+    local gh_url=$1
+
+    if type curl &>/dev/null; then
+        curl --user-agent "$gh_user_agent" -s "$gh_url"
+    elif type wget &>/dev/null; then
+        wget --user-agent="$gh_user_agent" -qO- "$gh_url"
+    else
+        echo "Please, install 'curl' or 'wget' and try again."
+        exit 1
+    fi
+}
+
+#
+# Converts local md file into html by GitHub
+#
+# ➥ curl -X POST --data '{"text": "Hello world github/linguist#1 **cool**, and #1!"}' https://api.github.com/markdown
+# <p>Hello world github/linguist#1 <strong>cool</strong>, and #1!</p>'"
+gh_toc_md2html() {
+    local gh_file_md=$1
+    curl -s --user-agent "$gh_user_agent" \
+        --data-binary @"$gh_file_md" -H "Content-Type:text/plain" \
+        https://api.github.com/markdown/raw
+}
+
+#
+# Is passed string url
+#
+gh_is_url() {
+    if [[ $1 == https* || $1 == http* ]]; then
+        echo "yes"
+    else
+        echo "no"
+    fi
+}
+
+#
+# TOC generator
+#
+gh_toc(){
+    local gh_src=$1
+    local gh_src_copy=$1
+    local gh_ttl_docs=$2
+
+    if [ "$gh_src" = "" ]; then
+        echo "Please, enter URL or local path for a README.md"
+        exit 1
+    fi
+
+
+    # Show "TOC" string only if working with one document
+    if [ "$gh_ttl_docs" = "1" ]; then
+
+        echo "Table of Contents"
+        echo "================="
+        echo ""
+        gh_src_copy=""
+
+    fi
+
+    if [ "$(gh_is_url "$gh_src")" == "yes" ]; then
+        gh_toc_load "$gh_src" | gh_toc_grab "$gh_src_copy"
+    else
+        gh_toc_md2html "$gh_src" | gh_toc_grab "$gh_src_copy"
+    fi
+}
+
+#
+# Grabber of the TOC from rendered html
+#
+# $1 — a source url of document.
+# It's need if TOC is generated for multiple documents.
+#
+gh_toc_grab() {
+	# if closed <h[1-6]> is on the new line, then move it on the prev line
+	# for example:
+	# 	was: The command <code>foo1</code>
+	# 		 </h1>
+	# 	became: The command <code>foo1</code></h1>
+    sed -e ':a' -e 'N' -e '$!ba' -e 's/\n<\/h/<\/h/g' |
+    # find strings that corresponds to template
+    grep -E -o '<a\s*id="user-content-[^"]*".*</h[1-6]' |
+    # remove code tags
+    sed 's/<code>//' | sed 's/<\/code>//' |
+    # now all rows are like:
+    #   <a id="user-content-..." href="..."><span ...></span></a> ... </h1
+    # format result line
+    #   * $0 — whole string
+    echo -e "$(awk -v "gh_url=$1" '{
+    print sprintf("%*s", substr($0, length($0), 1)*3, " ") "* [" substr($0, match($0, /a>.*<\/h/)+2, RLENGTH-5)"](" gh_url substr($0, match($0, "href=\"[^\"]+?\" ")+6, RLENGTH-8) ")"}' | sed 'y/+/ /; s/%/\\x/g')"
+}
+
+#
+# Returns filename only from full path or url
+#
+gh_toc_get_filename() {
+    echo "${1##*/}"
+}
+
+#
+# Options hendlers
+#
+gh_toc_app() {
+    local app_name="gh-md-toc"
+
+    if [ "$1" = '--help' ] || [ $# -eq 0 ] ; then
+        echo "GitHub TOC generator ($app_name): $gh_toc_version"
+        echo ""
+        echo "Usage:"
+        echo "  $app_name src [src]     Create TOC for a README file (url or local path)"
+        echo "  $app_name -             Create TOC for markdown from STDIN"
+        echo "  $app_name --help        Show help"
+        echo "  $app_name --version     Show version"
+        return
+    fi
+
+    if [ "$1" = '--version' ]; then
+        echo "$gh_toc_version"
+        return
+    fi
+
+    if [ "$1" = "-" ]; then
+        if [ -z "$TMPDIR" ]; then
+            TMPDIR="/tmp"
+        elif [ -n "$TMPDIR" -a ! -d "$TMPDIR" ]; then
+            mkdir -p "$TMPDIR"
+        fi
+        local gh_tmp_md
+        gh_tmp_md=$(mktemp $TMPDIR/tmp.XXXXXX)
+        while read input; do
+            echo "$input" >> "$gh_tmp_md"
+        done
+        gh_toc_md2html "$gh_tmp_md" | gh_toc_grab ""
+        return
+    fi
+
+    for md in "$@"
+    do
+        echo ""
+        gh_toc "$md" "$#"
+    done
+
+    echo ""
+    echo "Created by [gh-md-toc](https://github.com/ekalinin/github-markdown-toc)"
+}
+
+#
+# Entry point
+#
+gh_toc_app "$@"