// Copyright (c) 2006-2008 by Martin Stubenschrott <stubenschrott@vimperator.org>
// Copyright (c) 2007-2009 by Doug Kearns <dougkearns@gmail.com>
// Copyright (c) 2008-2010 by Kris Maglione <maglione.k@gmail.com>
// Some code based on Venkman
//
// This work is licensed for reuse under an MIT license. Details are
// given in the LICENSE.txt file included with this file.
"use strict";

try {

Components.utils.import("resource://dactyl/bootstrap.jsm");
defineModule("io", {
    exports: ["IO", "io"],
    require: ["services"],
    use: ["config", "storage", "styles", "template", "util"]
}, this);

// TODO: why are we passing around strings rather than file objects?
/**
 * Provides a basic interface to common system I/O operations.
 * @instance io
 */
var IO = Module("io", {
    init: function () {
        this._processDir = services.directory.get("CurWorkD", Ci.nsIFile);
        this._cwd = this._processDir.path;
        this._oldcwd = null;
    },

    Local: function (dactyl, modules, window) let ({ Script, io, plugins } = modules) ({

        init: function init() {
            this._processDir = services.directory.get("CurWorkD", Ci.nsIFile);
            this._cwd = this._processDir.path;
            this._oldcwd = null;

            this._lastRunCommand = ""; // updated whenever the users runs a command with :!
            this._scriptNames = [];

            this.downloadListener = {
                onDownloadStateChange: function (state, download) {
                    if (download.state == services.downloadManager.DOWNLOAD_FINISHED) {
                        let url   = download.source.spec;
                        let title = download.displayName;
                        let file  = download.targetFile.path;
                        let size  = download.size;

                        dactyl.echomsg({ domains: [util.getHost(url)], message: "Download of " + title + " to " + file + " finished" },
                                       1, modules.commandline.ACTIVE_WINDOW);
                        modules.autocommands.trigger("DownloadPost", { url: url, title: title, file: file, size: size });
                    }
                },
                onStateChange:    function () {},
                onProgressChange: function () {},
                onSecurityChange: function () {}
            };

            services.downloadManager.addListener(this.downloadListener);
        },

        destroy: function destroy() {
            services.downloadManager.removeListener(this.downloadListener);
            for (let [, plugin] in Iterator(plugins.contexts))
                if (plugin.onUnload)
                    plugin.onUnload();
        },

        /**
         * Returns all directories named *name* in 'runtimepath'.
         *
         * @param {string} name
         * @returns {nsIFile[])
         */
        getRuntimeDirectories: function getRuntimeDirectories(name) {
            let dirs = modules.options["runtimepath"];

            dirs = dirs.map(function (dir) File.joinPaths(dir, name, this.cwd), this)
                       .filter(function (dir) dir.exists() && dir.isDirectory() && dir.isReadable());
            return dirs;
        },

        // FIXME: multiple paths?
        /**
         * Sources files found in 'runtimepath'. For each relative path in *paths*
         * each directory in 'runtimepath' is searched and if a matching file is
         * found it is sourced. Only the first file found (per specified path) is
         * sourced unless *all* is specified, then all found files are sourced.
         *
         * @param {string[]} paths An array of relative paths to source.
         * @param {boolean} all Whether all found files should be sourced.
         */
        sourceFromRuntimePath: function sourceFromRuntimePath(paths, all) {
            let dirs = modules.options["runtimepath"];
            let found = false;

            dactyl.echomsg("Searching for " + paths.join(" ").quote() + " in " + modules.options.get("runtimepath").stringValue, 2);

        outer:
            for (let [, dir] in Iterator(dirs)) {
                for (let [, path] in Iterator(paths)) {
                    let file = File.joinPaths(dir, path, this.cwd);

                    dactyl.echomsg("Searching for " + file.path.quote(), 3);

                    if (file.exists() && file.isFile() && file.isReadable()) {
                        io.source(file.path, false);
                        found = true;

                        if (!all)
                            break outer;
                    }
                }
            }

            if (!found)
                dactyl.echomsg("not found in 'runtimepath': " + paths.join(" ").quote(), 1);

            return found;
        },

        /**
         * Reads Ex commands, JavaScript or CSS from *filename*.
         *
         * @param {string} filename The name of the file to source.
         * @param {boolean} silent Whether errors should be reported.
         */
        source: function source(filename, silent) {
            defineModule.loadLog.push("sourcing " + filename);
            let time = Date.now();
            this.withSavedValues(["sourcing"], function _source() {
                this.sourcing = null;
                try {
                    var file = util.getFile(filename) || io.File(filename);

                    if (!file.exists() || !file.isReadable() || file.isDirectory()) {
                        if (!silent)
                            dactyl.echoerr("E484: Can't open file " + filename.quote());
                        return;
                    }

                    dactyl.echomsg("sourcing " + filename.quote(), 2);

                    let uri = services.io.newFileURI(file);

                    // handle pure JavaScript files specially
                    if (/\.js$/.test(filename)) {
                        try {
                            dactyl.loadScript(uri.spec, Script(file));
                            dactyl.helpInitialized = false;
                        }
                        catch (e) {
                            if (e.fileName)
                                try {
                                    e.fileName = e.fileName.replace(/^(chrome|resource):.*? -> /, "");
                                    if (e.fileName == uri.spec)
                                        e.fileName = filename;
                                    e.echoerr = <>{e.fileName}:{e.lineNumber}: {e}</>;
                                }
                                catch (e) {}
                            throw e;
                        }
                    }
                    else if (/\.css$/.test(filename))
                        styles.registerSheet(uri.spec, false, true);
                    else {
                        modules.commands.execute(file.read(), null, silent || "loud", null,
                            { file: file.path, line: 1 });
                    }

                    if (this._scriptNames.indexOf(file.path) == -1)
                        this._scriptNames.push(file.path);

                    dactyl.echomsg("finished sourcing " + filename.quote(), 2);

                    dactyl.log("Sourced: " + filename, 3);
                }
                catch (e) {
                    if (!(e instanceof FailedAssertion))
                        dactyl.reportError(e);
                    let message = "Sourcing file: " + (e.echoerr || file.path + ": " + e);
                    if (!silent)
                        dactyl.echoerr(message);
                }
                finally {
                    defineModule.loadLog.push("done sourcing " + filename + ": " + (Date.now() - time) + "ms");
                }
            });
        },
    }),

    // TODO: there seems to be no way, short of a new component, to change
    // the process's CWD - see https://bugzilla.mozilla.org/show_bug.cgi?id=280953
    /**
     * Returns the current working directory.
     *
     * It's not possible to change the real CWD of the process so this
     * state is maintained internally. External commands run via
     * {@link #system} are executed in this directory.
     *
     * @returns {nsIFile}
     */
    get cwd() {
        let dir = File(this._cwd);

        // NOTE: the directory could have been deleted underneath us so
        // fallback to the process's CWD
        if (dir.exists() && dir.isDirectory())
            return dir.path;
        else
            return this._processDir.path;
    },

    /**
     * Sets the current working directory.
     *
     * @param {string} newDir The new CWD. This may be a relative or
     *     absolute path and is expanded by {@link #expandPath}.
     */
    set cwd(newDir) {
        newDir = newDir || "~";

        if (newDir == "-") {
            util.assert(this._oldcwd != null, "E186: No previous directory");
            [this._cwd, this._oldcwd] = [this._oldcwd, this.cwd];
        }
        else {
            let dir = io.File(newDir);
            util.assert(dir.exists() && dir.isDirectory(), "E344: Can't find directory " + dir.path.quote());
            dir.normalize();
            [this._cwd, this._oldcwd] = [dir.path, this.cwd];
        }
        return this.cwd;
    },

    /**
     * @property {function} File class.
     * @final
     */
    File: Class.memoize(function () let (io = this)
        Class("File", File, {
            init: function init(path, checkCWD)
                init.supercall(this, path, (arguments.length < 2 || checkCWD) && io.cwd)
        })),

    /**
     * @property {Object} The current file sourcing context. As a file is
     *     being sourced the 'file' and 'line' properties of this context
     *     object are updated appropriately.
     */
    sourcing: null,

    expandPath: deprecated("File.expandPath", function expandPath() File.expandPath.apply(File, arguments)),

    /**
     * Returns the first user RC file found in *dir*.
     *
     * @param {string} dir The directory to search.
     * @param {boolean} always When true, return a path whether
     *     the file exists or not.
     * @default $HOME.
     * @returns {nsIFile} The RC file or null if none is found.
     */
    getRCFile: function (dir, always) {
        dir = dir || "~";

        let rcFile1 = File.joinPaths(dir, "." + config.name + "rc", this.cwd);
        let rcFile2 = File.joinPaths(dir, "_" + config.name + "rc", this.cwd);

        if (util.OS.isWindows)
            [rcFile1, rcFile2] = [rcFile2, rcFile1];

        if (rcFile1.exists() && rcFile1.isFile())
            return rcFile1;
        else if (rcFile2.exists() && rcFile2.isFile())
            return rcFile2;
        else if (always)
            return rcFile1;
        return null;
    },

    // TODO: make secure
    /**
     * Creates a temporary file.
     *
     * @returns {File}
     */
    createTempFile: function () {
        let file = services.directory.get("TmpD", Ci.nsIFile);
        file.append(config.tempFile);
        file.createUnique(Ci.nsIFile.NORMAL_FILE_TYPE, octal(600));

        Cc["@mozilla.org/uriloader/external-helper-app-service;1"]
            .getService(Ci.nsPIExternalAppLauncher).deleteTemporaryFileOnExit(file);

        return File(file);
    },

    isJarURL: function (url) {
        try {
            let uri = util.newURI(url);
            let channel = services.io.newChannelFromURI(uri);
            channel.cancel(Cr.NS_BINDING_ABORTED);
            if (channel instanceof Ci.nsIJARChannel)
                return channel.URI.QueryInterface(Ci.nsIJARURI);
        }
        catch (e) {}
        return false;
    },

    readHeredoc: function (end) {
        return "";
    },

    pathSearch: function (bin) {
        let dirs = services.environment.get("PATH").split(util.OS.isWindows ? ";" : ":");
        // Windows tries the CWD first TODO: desirable?
        if (util.OS.isWindows)
            dirs = [io.cwd].concat(dirs);

        for (let [, dir] in Iterator(dirs))
            try {
                dir = io.File(dir, true);
                let file = dir.child(bin);
                if (file.exists())
                    return file;

                // TODO: couldn't we just palm this off to the start command?
                // automatically try to add the executable path extensions on windows
                if (util.OS.isWindows) {
                    let extensions = services.environment.get("PATHEXT").split(";");
                    for (let [, extension] in Iterator(extensions)) {
                        file = dir.child(bin + extension);
                        if (file.exists())
                            return file;
                    }
                }
            }
            catch (e) {}
        return null;
    },

    /**
     * Runs an external program.
     *
     * @param {string} program The program to run.
     * @param {string[]} args An array of arguments to pass to *program*.
     */
    run: function (program, args, blocking) {
        args = args || [];

        let file;

        if (program instanceof File || File.isAbsolutePath(program))
            file = this.File(program, true);
        else
            file = this.pathSearch(program);

        if (!file || !file.exists()) {
            util.dactyl.echoerr("Command not found: " + program);
            return -1;
        }

        let process = services.Process(file);
        process.run(false, args.map(String), args.length);
        try {
            if (callable(blocking))
                var timer = services.Timer(
                    function () {
                        if (!process.isRunning) {
                            timer.cancel();
                            util.trapErrors(blocking);
                        }
                    },
                    100, services.Timer.TYPE_REPEATING_SLACK);
            else if (blocking)
                while (process.isRunning)
                    util.threadYield(false, true);
        }
        catch (e) {
            process.kill();
            throw e;
        }

        return process.exitValue;
    },

    // TODO: when https://bugzilla.mozilla.org/show_bug.cgi?id=68702 is
    // fixed use that instead of a tmpfile
    /**
     * Runs *command* in a subshell and returns the output in a string. The
     * shell used is that specified by the 'shell' option.
     *
     * @param {string} command The command to run.
     * @param {string} input Any input to be provided to the command on stdin.
     * @returns {string}
     */
    system: function (command, input) {
        util.dactyl.echomsg("Calling shell to execute: " + command, 4);

        function escape(str) '"' + str.replace(/[\\"$]/g, "\\$&") + '"';

        return this.withTempFiles(function (stdin, stdout, cmd) {
            if (input instanceof File)
                stdin = input;
            else if (input)
                stdin.write(input);

            let shell = File(storage["options"].get("shell").value);
            let shcf = storage["options"].get("shellcmdflag").value;

            if (isArray(command))
                command = command.map(escape).join(" ");

            // TODO: implement 'shellredir'
            if (util.OS.isWindows && !/sh/.test(shell.leafName)) {
                command = "cd /D " + this.cwd + " && " + command + " > " + stdout.path + " 2>&1" + " < " + stdin.path;
                var res = this.run(shell, shcf.split(/\s+/).concat(command), true);
            }
            else {
                cmd.write("cd " + escape(this.cwd) + "\n" +
                        ["exec", ">" + escape(stdout.path), "2>&1", "<" + escape(stdin.path),
                         escape(shell.path), shcf, escape(command)].join(" "));
                res = this.run("/bin/sh", ["-e", cmd.path], true);
            }

            let output = stdout.read();
            if (res > 0)
                output += "\nshell returned " + res;
            else if (output)
                output = output.replace(/^(.*)\n$/, "$1");
            return output;
        }) || "";
    },

    /**
     * Creates a temporary file context for executing external commands.
     * *func* is called with a temp file, created with {@link #createTempFile},
     * for each explicit argument. Ensures that all files are removed when
     * *func* returns.
     *
     * @param {function} func The function to execute.
     * @param {Object} self The 'this' object used when executing func.
     * @returns {boolean} false if temp files couldn't be created,
     *     otherwise, the return value of *func*.
     */
    withTempFiles: function (func, self, checked) {
        let args = array(util.range(0, func.length)).map(this.createTempFile).array;
        try {
            if (!args.every(util.identity))
                return false;
            var res = func.apply(self || this, args);
        }
        finally {
            if (!checked || res !== true)
                args.forEach(function (f) f && f.remove(false));
        }
        return res;
    }
}, {
    /**
     * @property {string} The value of the $PENTADACTYL_RUNTIME environment
     *     variable.
     */
    get runtimePath() {
        const rtpvar = config.idName + "_RUNTIME";
        let rtp = services.environment.get(rtpvar);
        if (!rtp) {
            rtp = "~/" + (util.OS.isWindows ? "" : ".") + config.name;
            services.environment.set(rtpvar, rtp);
        }
        return rtp;
    },

    /**
     * @property {string} The current platform's path separator.
     */
    PATH_SEP: deprecated("File.PATH_SEP", { get: function PATH_SEP() File.PATH_SEP })
}, {
    init: function init(dactyl, modules, window) {
        modules.plugins.contexts = {};
        modules.Script = function Script(file) {
            const { io, plugins } = modules;

            let self = set.has(plugins, file.path) && plugins[file.path];
            if (self) {
                if (set.has(self, "onUnload"))
                    self.onUnload();
            }
            else {
                self = update(modules.newContext(plugins, true), {
                    NAME: file.leafName.replace(/\..*/, "").replace(/-([a-z])/g, function (m, n1) n1.toUpperCase()),
                    PATH: file.path,
                    CONTEXT: self
                });
                Class.replaceProperty(plugins, file.path, self);

                // This belongs elsewhere
                if (io.getRuntimeDirectories("plugins").some(
                        function (dir) dir.contains(file, false)))
                    Class.replaceProperty(plugins, self.NAME, self);
            }
            plugins.contexts[file.path] = self;
            return self;
        }

        init.superapply(this, arguments);
    },
    commands: function (dactyl, modules, window) {
        const { commands, completion, io } = modules;

        commands.add(["cd", "chd[ir]"],
            "Change the current directory",
            function (args) {
                let arg = args[0];

                if (!arg)
                    arg = "~";

                arg = File.expandPath(arg);

                // go directly to an absolute path or look for a relative path
                // match in 'cdpath'
                // TODO: handle ../ and ./ paths
                if (File.isAbsolutePath(arg)) {
                    io.cwd = arg;
                    dactyl.echomsg(io.cwd);
                }
                else {
                    let dirs = modules.options["cdpath"];
                    for (let [, dir] in Iterator(dirs)) {
                        dir = File.joinPaths(dir, arg, io.cwd);

                        if (dir.exists() && dir.isDirectory() && dir.isReadable()) {
                            io.cwd = dir.path;
                            dactyl.echomsg(io.cwd);
                            return;
                        }
                    }

                    dactyl.echoerr("E344: Can't find directory " + arg.quote() + " in cdpath");
                    dactyl.echoerr("E472: Command failed");
                }
            }, {
                argCount: "?",
                completer: function (context) completion.directory(context, true),
                literal: 0
            });

        // NOTE: this command is only used in :source
        commands.add(["fini[sh]"],
            "Stop sourcing a script file",
            function () {
                dactyl.assert(io.sourcing, "E168: :finish used outside of a sourced file");
                io.sourcing.finished = true;
            },
            { argCount: "0" });

        commands.add(["pw[d]"],
            "Print the current directory name",
            function () { dactyl.echomsg(io.cwd); },
            { argCount: "0" });

        commands.add([config.name.replace(/(.)(.*)/, "mk$1[$2rc]")],
            "Write current key mappings and changed options to the config file",
            function (args) {
                dactyl.assert(args.length <= 1, "E172: Only one file name allowed");

                let filename = args[0] || io.getRCFile(null, true).path;
                let file = io.File(filename);

                dactyl.assert(!file.exists() || args.bang,
                              "E189: " + filename.quote() + " exists (add ! to override)");

                // TODO: Use a set/specifiable list here:
                let lines = [cmd.serialize().map(commands.commandToString, cmd) for (cmd in commands.iterator()) if (cmd.serialize)];
                lines = array.flatten(lines);

                lines.unshift('"' + config.version + "\n");
                lines.push("\n\" vim: set ft=" + config.name + ":");

                try {
                    file.write(lines.join("\n"));
                }
                catch (e) {
                    dactyl.echoerr("E190: Cannot open " + filename.quote() + " for writing");
                    dactyl.log("Could not write to " + file.path + ": " + e.message); // XXX
                }
            }, {
                argCount: "*", // FIXME: should be "?" but kludged for proper error message
                bang: true,
                completer: function (context) completion.file(context, true)
            });

        commands.add(["mks[yntax]"],
            "Generate a Vim syntax file",
            function (args) {
                let runtime = util.OS.isWindows ? "~/vimfiles/" : "~/.vim/";
                let file = io.File(runtime + "syntax/" + config.name + ".vim");
                if (args.length)
                    file = io.File(args[0]);

                if (file.exists() && file.isDirectory() || args[0] && /\/$/.test(args[0]))
                    file.append(config.name + ".vim");
                dactyl.assert(!file.exists() || args.bang, "File exists");

                let template = util.compileMacro(String(<![CDATA[
" Vim syntax file
" Language:         Pentadactyl configuration file
" Maintainer:       Doug Kearns <dougkearns@gmail.com>

" TODO: make this <name> specific - shared dactyl config?

if exists("b:current_syntax")
  finish
endif

let s:cpo_save = &cpo
set cpo&vim

syn include @javascriptTop syntax/javascript.vim
unlet b:current_syntax

syn include @cssTop syntax/css.vim
unlet b:current_syntax

syn match <name>CommandStart "\%(^\s*:\=\)\@<=" nextgroup=<name>Command,<name>AutoCmd

<commands>
    \ contained

syn match <name>Command "!" contained

syn keyword <name>AutoCmd au[tocmd] contained nextgroup=<name>AutoEventList skipwhite

<autocommands>
    \ contained

syn match <name>AutoEventList "\(\a\+,\)*\a\+" contained contains=<name>AutoEvent

syn region <name>Set matchgroup=<name>Command start="\%(^\s*:\=\)\@<=\<\%(setl\%[ocal]\|setg\%[lobal]\|set\=\)\=\>"
    \ end="$" keepend oneline contains=<name>Option,<name>String

<options>
    \ contained nextgroup=pentadactylSetMod

<toggleoptions>
execute 'syn match <name>Option "\<\%(no\|inv\)\=\%(' .
    \ join(s:toggleOptions, '\|') .
    \ '\)\>!\=" contained nextgroup=<name>SetMod'

syn match <name>SetMod "\%(\<[a-z_]\+\)\@<=&" contained

syn region <name>JavaScript start="\%(^\s*\%(javascript\|js\)\s\+\)\@<=" end="$" contains=@javascriptTop keepend oneline
syn region <name>JavaScript matchgroup=<name>JavaScriptDelimiter
    \ start="\%(^\s*\%(javascript\|js\)\s\+\)\@<=<<\s*\z(\h\w*\)"hs=s+2 end="^\z1$" contains=@javascriptTop fold

let s:cssRegionStart = '\%(^\s*sty\%[le]!\=\s\+\%(-\%(n\|name\)\%(\s\+\|=\)\S\+\s\+\)\=[^-]\S\+\s\+\)\@<='
execute 'syn region <name>Css start="' . s:cssRegionStart . '" end="$" contains=@cssTop keepend oneline'
execute 'syn region <name>Css matchgroup=<name>CssDelimiter'
    \ 'start="' . s:cssRegionStart . '<<\s*\z(\h\w*\)"hs=s+2 end="^\z1$" contains=@cssTop fold'

syn match <name>Notation "<[0-9A-Za-z-]\+>"

syn match   <name>Comment +".*$+ contains=<name>Todo,@Spell
syn keyword <name>Todo FIXME NOTE TODO XXX contained

syn region <name>String start="\z(["']\)" end="\z1" skip="\\\\\|\\\z1" oneline

syn match <name>LineComment +^\s*".*$+ contains=<name>Todo,@Spell

" NOTE: match vim.vim highlighting group names
hi def link <name>AutoCmd               <name>Command
hi def link <name>AutoEvent             Type
hi def link <name>Command               Statement
hi def link <name>Comment               Comment
hi def link <name>JavaScriptDelimiter   Delimiter
hi def link <name>CssDelimiter          Delimiter
hi def link <name>Notation              Special
hi def link <name>LineComment           Comment
hi def link <name>Option                PreProc
hi def link <name>SetMod                <name>Option
hi def link <name>String                String
hi def link <name>Todo                  Todo

let b:current_syntax = "<name>"

let &cpo = s:cpo_save
unlet s:cpo_save

" vim: tw=130 et ts=4 sw=4:
]]>), true);

                const WIDTH = 80;
                function wrap(prefix, items, sep) {
                    sep = sep || " ";
                    let width = 0;
                    let lines = [];
                    lines.__defineGetter__("last", function () this[this.length - 1]);

                    for (let item in values(items.array || items)) {
                        if (item.length > width && (!lines.length || lines.last.length > 1)) {
                            lines.push([prefix]);
                            width = WIDTH - prefix.length;
                            prefix = "    \\ ";
                        }
                        width -= item.length + sep.length;
                        lines.last.push(item, sep);
                    }
                    lines.last.pop();
                    return lines.map(function (l) l.join("")).join("\n").replace(/\s+\n/gm, "\n");
                }

                file.write(template({
                    name: config.name,
                    autocommands: wrap("syn keyword " + config.name + "AutoEvent ",
                                       keys(config.autocommands)),
                    commands: wrap("syn keyword " + config.name + "Command ",
                                  array(c.specs for (c in commands)).flatten()),
                    options: wrap("syn keyword " + config.name + "Option ",
                                  array(o.names for (o in modules.options) if (o.type != "boolean")).flatten()),
                    toggleoptions: wrap("let s:toggleOptions = [",
                                        array(o.realNames for (o in modules.options) if (o.type == "boolean"))
                                            .flatten().map(String.quote),
                                        ", ") + "]"
                }));
            }, {
                argCount: "?",
                bang: true,
                completer: function (context) completion.file(context, true),
                literal: 1
            });

        commands.add(["runt[ime]"],
            "Source the specified file from each directory in 'runtimepath'",
            function (args) { io.sourceFromRuntimePath(args, args.bang); },
            {
                argCount: "+",
                bang: true,
                completer: function (context) completion.runtime(context)
            }
        );

        commands.add(["scrip[tnames]"],
            "List all sourced script names",
            function () {
                modules.commandline.commandOutput(
                    template.tabular(["<SNR>", "Filename"], ["text-align: right; padding-right: 1em;"],
                        ([i + 1, file] for ([i, file] in Iterator(io._scriptNames)))));  // TODO: add colon and remove column titles for pedantic Vim compatibility?
            },
            { argCount: "0" });

        commands.add(["so[urce]"],
            "Read Ex commands from a file",
            function (args) {
                if (args.length > 1)
                    dactyl.echoerr("E172: Only one file name allowed");
                else
                    io.source(args[0], args.bang);
            }, {
                argCount: "+", // FIXME: should be "1" but kludged for proper error message
                bang: true,
                completer: function (context) completion.file(context, true)
            });

        commands.add(["!", "run"],
            "Run a command",
            function (args) {
                let arg = args[0] || "";

                // :!! needs to be treated specially as the command parser sets the
                // bang flag but removes the ! from arg
                if (args.bang)
                    arg = "!" + arg;

                // NOTE: Vim doesn't replace ! preceded by 2 or more backslashes and documents it - desirable?
                // pass through a raw bang when escaped or substitute the last command

                // This is an asinine and irritating feature when we have searchable
                // command-line history. --Kris
                if (modules.options["banghist"]) {
                    // replaceable bang and no previous command?
                    dactyl.assert(!/((^|[^\\])(\\\\)*)!/.test(arg) || io._lastRunCommand,
                        "E34: No previous command");

                    arg = arg.replace(/(\\)*!/g,
                        function (m) /^\\(\\\\)*!$/.test(m) ? m.replace("\\!", "!") : m.replace("!", io._lastRunCommand)
                    );
                }

                io._lastRunCommand = arg;

                let output = io.system(arg);

                modules.commandline.command = "!" + arg;
                modules.commandline.commandOutput(<span highlight="CmdOutput">{output}</span>);

                modules.autocommands.trigger("ShellCmdPost", {});
            }, {
                argCount: "?", // TODO: "1" - probably not worth supporting weird Vim edge cases. The dream is dead. --djk
                bang: true,
                // This is abominably slow.
                // completer: function (context) completion.shellCommand(context),
                literal: 0
            });
    },
    completion: function (dactyl, modules, window) {
        const { completion, io } = modules;

        completion.charset = function (context) {
            context.anchored = false;
            context.keys = {
                text: util.identity,
                description: function (charset) {
                    try {
                        return services.charset.getCharsetTitle(charset);
                    }
                    catch (e) {
                        return charset;
                    }
                }
            };
            context.generate = function () iter(services.charset.getDecoderList());
        };

        completion.directory = function directory(context, full) {
            this.file(context, full);
            context.filters.push(function (item) item.isdir);
        };

        completion.environment = function environment(context) {
            context.title = ["Environment Variable", "Value"];
            context.generate = function ()
                io.system(util.OS.isWindows ? "set" : "env")
                  .split("\n").filter(function (line) line.indexOf("=") > 0)
                  .map(function (line) line.match(/([^=]+)=(.*)/).slice(1));
        };

        completion.file = function file(context, full, dir) {
            // dir == "" is expanded inside readDirectory to the current dir
            function getDir(str) str.match(/^(?:.*[\/\\])?/)[0];
            dir = getDir(dir || context.filter);

            let file = util.getFile(dir);
            if (file && (!file.exists() || !file.isDirectory()))
                file = file.parent;

            if (!full)
                context.advance(dir.length);

            context.title = [full ? "Path" : "Filename", "Type"];
            context.keys = {
                text: !full ? "leafName" : function (f) this.path,
                path: function (f) dir + f.leafName,
                description: function (f) this.isdir ? "Directory" : "File",
                isdir: function (f) f.isDirectory(),
                icon: function (f) this.isdir ? "resource://gre/res/html/folder.png"
                                              : "moz-icon://" + f.leafName
            };
            context.compare = function (a, b) b.isdir - a.isdir || String.localeCompare(a.text, b.text);

            if (modules.options["wildignore"]) {
                let wig = modules.options.get("wildignore");
                context.filters.push(function (item) item.isdir || !wig.getKey(this.name));
            }

            // context.background = true;
            context.key = dir;
            let uri = io.isJarURL(dir);
            if (uri)
                context.generate = function generate_jar() {
                    let file = util.getFile(uri.JARFile);
                    if (file) {
                        // let jar = services.zipReader.getZip(file); Crashes.
                        let jar = services.ZipReader(file);
                        try {
                            let filter = RegExp("^" + util.regexp.escape(decodeURI(getDir(uri.JAREntry)))
                                                + "[^/]*/?$");
                            return [
                                {
                                      isDirectory: function () s.substr(-1) == "/",
                                      leafName: /([^\/]*)\/?$/.exec(s)[1]
                                }
                                for (s in iter(jar.findEntries("*"))) if (filter.test(s))
                            ]
                        }
                        finally {
                            jar.close();
                        }
                    }
                };
            else
                context.generate = function generate_file() {
                    try {
                        return io.File(file || dir).readDirectory();
                    }
                    catch (e) {}
                    return [];
                };
        };

        completion.runtime = function (context) {
            for (let [, dir] in Iterator(modules.options["runtimepath"]))
                context.fork(dir, 0, this, function (context) {
                    dir = dir.replace("/+$", "") + "/";
                    completion.file(context, true, dir + context.filter);
                    context.title[0] = dir;
                    context.keys.text = function (f) this.path.substr(dir.length);
                });
        };

        completion.shellCommand = function shellCommand(context) {
            context.title = ["Shell Command", "Path"];
            context.generate = function () {
                let dirNames = services.environment.get("PATH").split(util.OS.isWindows ? ";" : ":");
                let commands = [];

                for (let [, dirName] in Iterator(dirNames)) {
                    let dir = io.File(dirName);
                    if (dir.exists() && dir.isDirectory())
                        commands.push([[file.leafName, dir.path] for (file in iter(dir.directoryEntries))
                                       if (file.isFile() && file.isExecutable())]);
                }

                return array.flatten(commands);
            };
        };

        completion.addUrlCompleter("f", "Local files", function (context, full) {
            let match = util.regexp(<![CDATA[
                ^
                (?P<prefix>
                    (?P<proto>
                        (?P<scheme> chrome|resource)
                        :\/\/
                    )
                    [^\/]*
                )
                (?P<path> \/[^\/]* )?
                $
            ]]>).exec(context.filter);
            if (match) {
                if (!match.path) {
                    context.key = match.proto;
                    context.advance(match.proto.length);
                    context.generate = function () util.chromePackages.map(function (p) [p, match.proto + p + "/"]);
                }
                else if (match.scheme === "chrome") {
                    context.key = match.prefix;
                    context.advance(match.prefix.length + 1);
                    context.generate = function () iter({
                        content: "Chrome content",
                        locale: "Locale-specific content",
                        skin: "Theme-specific content"
                    });
                }
            }
            if (!match || match.scheme === "resource" && match.path)
                if (/^(\.{0,2}|~)\/|^file:/.test(context.filter) || util.getFile(context.filter) || io.isJarURL(context.filter))
                    completion.file(context, full);
        });
    },
    javascript: function (dactyl, modules, window) {
        modules.JavaScript.setCompleter([File, File.expandPath],
            [function (context, obj, args) {
                context.quote[2] = "";
                completion.file(context, true);
            }]);

    },
    options: function (dactyl, modules, window) {
        const { options } = modules;

        var shell, shellcmdflag;
        if (util.OS.isWindows) {
            shell = "cmd.exe";
            shellcmdflag = "/c";
        }
        else {
            shell = services.environment.get("SHELL") || "sh";
            shellcmdflag = "-c";
        }

        options.add(["banghist", "bh"],
            "Replace occurrences of ! with the previous command when executing external commands",
            "boolean", true);

        options.add(["fileencoding", "fenc"],
            "The character encoding used when reading and writing files",
            "string", "UTF-8", {
                completer: function (context) completion.charset(context),
                getter: function () File.defaultEncoding,
                setter: function (value) (File.defaultEncoding = value)
            });
        options.add(["cdpath", "cd"],
            "List of directories searched when executing :cd",
            "stringlist", ["."].concat(services.environment.get("CDPATH").split(/[:;]/).filter(util.identity)).join(","),
            { setter: function (value) File.expandPathList(value) });

        options.add(["runtimepath", "rtp"],
            "List of directories searched for runtime files",
            "stringlist", IO.runtimePath);

        options.add(["shell", "sh"],
            "Shell to use for executing external commands with :! and :run",
            "string", shell);

        options.add(["shellcmdflag", "shcf"],
            "Flag passed to shell when executing external commands with :! and :run",
            "string", shellcmdflag,
            {
                getter: function (value) {
                    if (this.hasChanged || !util.OS.isWindows)
                        return value;
                    return /sh/.test(options["shell"]) ? "-c" : "/c";
                }
            });
        options["shell"]; // Make sure it's loaded into global storage.
        options["shellcmdflag"];

        options.add(["wildignore", "wig"],
            "List of file patterns to ignore when completing file names",
            "regexplist", "");
    }
});

endModule();

} catch(e){ if (isString(e)) e = Error(e); dump(e.fileName+":"+e.lineNumber+": "+e+"\n" + e.stack); }

// vim: set fdm=marker sw=4 ts=4 et ft=javascript: