Added pandoc installer

diff --git a/pandoc/README.md b/pandoc/README.md
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+++ b/pandoc/README.md
@@ -0,0 +1,30 @@
+---
+title: Pandoc
+homepage: https://github.com/jgm/pandoc
+tagline: |
+  Pandoc is a Haskell library for converting from one markup format to another.
+---
+
+## Updating `pandoc`
+
+```bash
+webi pandoc@stable
+```
+
+Use the `@beta` tag for pre-releases.
+
+## Cheat Sheet
+
+> Pandoc is a Haskell library for converting from one markup format to another, and a command-line tool that uses this library.
+
+```bash
+pandoc -o output.html input.txt
+```
+
+Specifying formats
+
+```bash
+pandoc -f markdown -t latex hello.txt
+```
+
+Documentation: https://pandoc.org/MANUAL.html

diff --git a/pandoc/install.ps1 b/pandoc/install.ps1
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+++ b/pandoc/install.ps1
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+#!/usr/bin/env pwsh
+
+###################
+# Install pandoc #
+###################
+
+# Every package should define these variables
+$pkg_cmd_name = "pandoc"
+
+$pkg_dst_cmd = "$Env:USERPROFILE\.local\bin\pandoc.exe"
+$pkg_dst = "$pkg_dst_cmd"
+
+$pkg_src_cmd = "$Env:USERPROFILE\.local\opt\pandoc-v$Env:WEBI_VERSION\bin\pandoc.exe"
+$pkg_src_bin = "$Env:USERPROFILE\.local\opt\pandoc-v$Env:WEBI_VERSION\bin"
+$pkg_src_dir = "$Env:USERPROFILE\.local\opt\pandoc-v$Env:WEBI_VERSION"
+$pkg_src = "$pkg_src_cmd"
+
+$pkg_download = "$Env:USERPROFILE\Downloads\$Env:WEBI_PKG_FILE"
+
+# Fetch archive
+IF (!(Test-Path -Path "$Env:USERPROFILE\Downloads\$Env:WEBI_PKG_FILE"))
+{
+    # TODO: arch detection
+    echo "Downloading pandoc from $Env:WEBI_PKG_URL to $pkg_download"
+    & curl.exe -A "$Env:WEBI_UA" -fsSL "$Env:WEBI_PKG_URL" -o "$pkg_download.part"
+    & move "$pkg_download.part" "$pkg_download"
+}
+
+IF (!(Test-Path -Path "$pkg_src_cmd"))
+{
+    echo "Installing pandoc"
+
+    # TODO: create package-specific temp directory
+    # Enter tmp
+    pushd .local\tmp
+
+        # Remove any leftover tmp cruft 
+        Remove-Item -Path ".\pandoc-v*" -Recurse -ErrorAction Ignore
+        Remove-Item -Path ".\pandoc.exe" -Recurse -ErrorAction Ignore
+
+        # Unpack archive file into this temporary directory
+        # Windows BSD-tar handles zip. Imagine that.
+        echo "Unpacking $pkg_download"
+        & tar xf "$pkg_download"
+       
+
+        # Settle unpacked archive into place
+        echo "Install Location: $pkg_src_cmd"
+        New-Item "$pkg_src_bin" -ItemType Directory -Force
+        Move-Item -Path ".\pandoc-*\pandoc.exe" -Destination "$pkg_src_bin"
+
+    # Exit tmp
+    popd
+}
+
+echo "Copying into '$pkg_dst_cmd' from '$pkg_src_cmd'"
+Remove-Item -Path "$pkg_dst_cmd" -Recurse -ErrorAction Ignore
+Copy-Item -Path "$pkg_src" -Destination "$pkg_dst" -Recurse

diff --git a/pandoc/install.sh b/pandoc/install.sh
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+++ b/pandoc/install.sh
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+{
+    set -e
+    set -u
+
+    ###################
+    # Install pandoc #
+    ###################
+
+    # Every package should define these 6 variables
+    pkg_cmd_name="pandoc"
+
+    pkg_dst_cmd="$HOME/.local/bin/pandoc"
+    pkg_dst="$pkg_dst_cmd"
+
+    pkg_src_cmd="$HOME/.local/opt/pandoc-v$WEBI_VERSION/bin/pandoc"
+    pkg_src_dir="$HOME/.local/opt/pandoc-v$WEBI_VERSION"
+    pkg_src="$pkg_src_cmd"
+
+    # pkg_install must be defined by every package
+    pkg_install() {
+        # ~/.local/opt/pandoc-v2.10.1/bin
+        mkdir -p "$(dirname $pkg_src_cmd)"
+
+        # mv ./pandoc-*/pandoc ~/.local/opt/pandoc-v2.10.1/bin/pandoc
+        mv ./pandoc-*/bin/pandoc "$pkg_src_cmd"
+    }
+
+    # pkg_get_current_version is recommended, but (soon) not required
+    pkg_get_current_version() {
+        # 'pandoc --version' has output in this format:
+        # pandoc 2.10.1
+        # Compiled with pandoc-types 1.21, texmath 0.12.0.3, skylighting 0.8.5
+        # Default user data directory: /home/sergi/.local/share/pandoc or /home/sergi/.pandoc
+        # Copyright (C) 2006-2020 John MacFarlane
+        # Web:  https://pandoc.org
+        # This is free software; see the source for copying conditions.
+        # There is no warranty, not even for merchantability or fitness
+        # for a particular purpose.
+        # This trims it down to just the version number:
+        #       2.10.1
+      echo $(pandoc --version 2>/dev/null | head -n 1 | cut -d ' ' -f 2)
+    }
+}

diff --git a/pandoc/releases.js b/pandoc/releases.js
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index 0000000..ef1257b
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+++ b/pandoc/releases.js
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+'use strict';
+
+var github = require('../_common/github.js');
+var owner = 'jgm';
+var repo = 'pandoc';
+
+module.exports = function (request) {
+  return github(request, owner, repo).then(function (all) {
+    return all;
+  });
+};
+
+if (module === require.main) {
+  module.exports(require('@root/request')).then(function (all) {
+    all = require('../_webi/normalize.js')(all);
+    // just select the first 5 for demonstration
+    all.releases = all.releases.slice(0, 5);
+    console.info(JSON.stringify(all, null, 2));
+  });
+}