Add support for partials and path segments for Handlebars.

This introduces support for some missing features to the Handlebars lexer:
Partials and path segments. Partials mostly appeared to work before, but the
`>` in `{{> ... }}` would appear as a syntax error, as could other
components of the partial. This change introduces support for:

* Standard partials: `{{> partialName}}`
* Partials with parameters: `{{> partialName varname="value"}}`
* Ddynamic partials: `{{> (partialFunc)}}`
* Ddynamic partials with lookups: `{{> (lookup ../path "partialName")}}`
* Partial blocks: `{{> @partial-block}}`
* Inline partials: `{{#*inline}}..{{/inline}}`

It also introduces support for path segments, which can reference content in
the current context or in a parent context. For instance, `this.name`,
`this/name`, `./name`, `../name`, `this/name`, etc. These are all now tracked
as variables.

1 files changed, 84 insertions, 0 deletions

diff --git a/external/autopygmentize b/external/autopygmentize
new file mode 100755
index 00000000..f18cac09
--- /dev/null
+++ b/external/autopygmentize
@@ -0,0 +1,84 @@
+#!/bin/bash
+# Best effort auto-pygmentization with transparent decompression
+# by Reuben Thomas 2008-2015
+# This program is in the public domain.
+
+# Strategy: first see if pygmentize can find a lexer; if not, ask file; if that finds nothing, fail
+# Set the environment variable PYGMENTIZE_OPTS or pass options before the file path to configure pygments.
+
+# This program can be used as a .lessfilter for the less pager to auto-color less's output
+
+file="${!#}"              # last argument
+options=${@:1:$(($#-1))}  # handle others args as options to pass to pygmentize
+
+file_common_opts="--brief --dereference"
+
+lexer=$(pygmentize -N "$file")
+if [[ "$lexer" == text ]]; then
+    unset lexer
+    case $(file --mime-type --uncompress $file_common_opts "$file") in
+        application/xml|image/svg+xml) lexer=xml;;
+        application/javascript) lexer=javascript;;
+        text/html) lexer=html;;
+        text/troff) lexer=nroff;;
+        text/x-asm) lexer=nasm;;
+        text/x-awk) lexer=awk;;
+        text/x-c) lexer=c;;
+        text/x-c++) lexer=cpp;;
+        text/x-diff) lexer=diff;;
+        text/x-fortran) lexer=fortran;;
+        text/x-gawk) lexer=gawk;;
+        text/x-java) lexer=java;;
+        text/x-lisp) lexer=common-lisp;;
+        text/x-lua) lexer=lua;;
+        text/x-makefile) lexer=make;;
+        text/x-msdos-batch) lexer=bat;;
+        text/x-nawk) lexer=nawk;;
+        text/x-pascal) lexer=pascal;;
+        text/x-perl) lexer=perl;;
+        text/x-php) lexer=php;;
+        text/x-po) lexer=po;;
+        text/x-python) lexer=python;;
+        text/x-ruby) lexer=ruby;;
+        text/x-crystal) lexer=crystal;;
+        text/x-shellscript) lexer=sh;;
+        text/x-tcl) lexer=tcl;;
+        text/x-tex|text/x-texinfo) lexer=latex;; # FIXME: texinfo really needs its own lexer
+        
+        # Types that file outputs which pygmentize didn't support as of file 5.20, pygments 2.0
+        # text/calendar
+        # text/inf
+        # text/PGP
+        # text/rtf
+        # text/texmacs
+        # text/vnd.graphviz
+        # text/x-bcpl
+        # text/x-info
+        # text/x-m4
+        # text/x-vcard
+        # text/x-xmcd
+        
+        text/plain)  # special filenames. TODO: insert more
+            case $(basename "$file") in
+                .zshrc) lexer=sh;;
+            esac
+            ;;
+    esac
+fi
+
+encoding=$(file --mime-encoding --uncompress $file_common_opts "$file")
+if [[ $encoding == "binary" ]]; then
+    encoding="latin1"
+fi
+
+if [[ -n "$lexer" ]]; then
+    concat=cat
+    case $(file $file_common_opts --mime-type "$file") in
+        application/x-gzip)  concat=zcat;;
+        application/x-bzip2) concat=bzcat;;
+        application/x-xz)    concat=xzcat;;
+    esac
+    exec $concat "$file" | pygmentize -O inencoding=$encoding $PYGMENTIZE_OPTS $options -l $lexer
+fi
+
+exit 1