;; ============================================
;; Script: file-requester.r
;; downloaded from: www.REBOL.org
;; on: 13-Mar-2018
;; at: 4:07:18.895006 UTC
;; owner: luce80 [script library member who can
;; update this script]
;; ============================================
Rebol [
    Title: "Open a file or directory requester"
    Date: 16-09-2017
    Version: 1.4.11
    File: %file-requester.r
    Author: "Marco Antoniazzi"
    Rights: "Copyright (C) 2012-2017 Marco Antoniazzi"
    Purpose: "Requests a file or directory"
    eMail: [luce80 AT libero DOT it]
    History: [
        0.0.1 [02-09-2012 "First version"]
        1.0.0 [08-09-2012 "Finished"]
        1.0.1 [09-09-2012 "Minor fixes"]
        1.0.2 [21-09-2012 "Sort drop down path tree, update scroller on resize"]
        1.0.3 [27-10-2012 "Fixed what-dir for keep, returned full path"]
        1.0.4 [03-11-2012 "Minor fixes, return rebol file!"]
        1.0.5 [09-06-2013 "Fixed external loading of tooltip style"]
        1.0.6 [12-06-2013 "Fixed All filter on Linux, hide hidden files on Linux,made styles local"]
        1.0.7 [15-06-2013 "Added some key shortcuts, wheel-scroll on drop-list"]
        1.2.1 [16-06-2013 "Added multi-selection and sorting (now has same functionality as original)"]
        1.2.2 [17-06-2013 "Fixed silly bug of convert string to block of files, default All filter on Linux"]
        1.3.1 [18-06-2013 "Added file renaming (press F2)"]
        1.3.2 [21-06-2013 "Fixed list size on Linux"]
        1.3.3 [23-06-2013 "Fixed keep"]
        1.3.4 [25-06-2013 "Added selection on key, fixed multi selection"]
        1.4.1 [30-06-2013 "Added showing of sizes and dates, various fixes"]
        1.4.2 [03-07-2013 "Various fixes for key shortcuts and multi selection"]
        1.4.3 [23-11-2013 "Adapted to Rebol 3 (with vid1r3.r3)"]
        1.4.4 [08-12-2013 "Changed gather-each"]
        1.4.5 [26-02-2014 "Fixed dialogs offsets"]
        1.4.6 [23-03-2014 "Changed behavior of left-right keys, improved load-script-thru"]
        1.4.7 [12-04-2015 "Fixed find-any, fixed enquoting single file, fixed global cancelled"]
        1.4.8 [28-03-2016 "Fixed single file selection when saving, improved enter handling"]
        1.4.9 [17-04-2016 "Fixed update_list, fixed auto executing examples"]
        1.4.10 [10-06-2016 "Added if not value?"]
        1.4.11 [16-09-2017 "Fixed updating after changing sorting type"]
    Note: { Filters can be in the form: "*.a" or "*.a;*.b" or "Short description (*.a)" or "Short description (*.a;*.b)" or
        a block of such strings.
        Use arrows to move in list of files.
        Use also <Ctrl> to multi-select
        Use F2 to rename currently selected file
    Category: [util vid files]
    library: [
        level: 'intermediate
        platform: 'all
        type: 'function
        domain: [gui files]
        tested-under: [View Atronix-View]
        support: none
        license: 'LGPL2
        see-also: none
    thumbnail: http://i40.tinypic.com/nvse8h.png
    comment: "2-Sep-2012 GUI automatically generated by VID_build. Author: Marco Antoniazzi"
    todo: {
        - add possibility to not show hidden files (done for Linux)
        - allow searching
        - display preview
        - add status bar that shows number of selected files and the total size
        - check if new folder already exists
        - add /safe option when saveing to check if file already exists
;**** please set correct path to vid1r3.r3 and sdk sources (or use empty string to use default path to sdk) ****
if all [system/version > 2.9.0 not value? 'mimic-do-event] [do/args %../../r3/local/vid1r3.r3 %../../sdk-2706031/rebol-sdk-276/source]

if not value? 'file-req-ctx [

file-req-ctx: context [
    ; files, filter, new folder, rename, drop-list
        suffix?: func [
            {Return the suffix (ext) of a filename or url, else tail of it.} 
            path [any-string!]
            either all [
                suff: find/last path #"." 
                not find suff #"/"
            ] [suff] [tail path]

        dir?: func [file [file!]] [#"/" = last file]

        is-link?: func [file [file!] /local str] [ ; WARNING: THIS IS A DIRTY HACK!
            if all [
                equal? suffix? file %.lnk
                System/version/4 = 3 ;Win
                ;System/version <= 2.7.8 ; temporarily disable for R3 since find/any does not work
                attempt [str: read file]
                equal? head str find str #{4C000000} 
            ] [str]
        undirize: func ["Returns a copy of the path turned into a file."
            path [file! string! url!]
            path: copy path
            while [find "/\" pick path: back tail path 1] [remove path]
            head path

        parent-dir: func ["Returns the parent directory of given path"
            file [file!]
            if equal? length? file 1 [return %/]
            head clear find/tail/last undirize file %/

        get-win-vols: func [/local vols drive char] [
            vols: copy []
            repeat char 26 [
                if attempt [read join %/ drive: to-file rejoin [to-char char + #"a" - 1 "/"]]  [
                    append vols drive

        online?: does [not error? try [close open tcp://www.google.com:80]]
        on-win?: system/version/4 = 3

        to-itime: func [time [time!]] [ ; same as to-itime but MUCH faster
            time: form to time! to integer! time ; strip micros
            if 2 = index? find time ":" [insert time "0"]
            if 5 = length? time [insert tail time ":00"]
            head time

        find-any: func [
            "Finds a value in a string using wildcards and returns the string at the start of it."
            series [series!] value [string!] /match /last
            /local last* str give_head emit pos pos2 non-wild-chars plain-chars tmp rule
            last*: get load "last"
            give_head: none
            str: copy series
            value: copy value
            if empty? value [return none]
            ; normalize pattern
            while [find value "**"] [replace/all value "**" "*"]
            while [find value "*?"] [replace/all value "*?" "*"]
            if value = "*" [return series]
            if last [
                reverse value
                reverse str
            if #"*" = first value [
                remove value
                if not any [last match] [give_head: series]
                match: none

            emit: func [arg][append rule arg]

            non-wild-chars: complement charset "*?"
            plain-chars: [copy tmp some non-wild-chars (emit copy tmp)]

            rule: copy []
            parse/all value [
                some [plain-chars | "*" (emit 'thru) | "?" (emit 'skip)]
            ; If the last thing in our pattern is thru, it won't work so we
            ; remove the trailing thru.
            if 'thru = last* rule [remove back tail rule]
            value: compose/deep [any [(all [none? match 'to]) (first rule) pos: (rule) pos2: to end | thru (first rule)] ]
            if none? parse/all str value [return none]
            if last [pos: skip series (length? series) - (index? pos2) + 1]
            any [give_head pos]

        gather-each: func ['word [word!] data [series!] body [block!] /into result [block!] /local n] [;collect
            result: any [result copy []]
            foreach n data [set word n if do body [insert tail result n]]
            head result

        sort_files: func [files [block!]] [
            sort/compare files func [a b] select [
                "Name" [a < b]
                "Size" [(any [size? a 0]) < any [size? b 0]] 
                "Date" [(any [modified? a 1-1-0]) < any [modified? b 1-1-0]]
            ] get-face choice-sort
            if "decreasing" = get-face choice-order [reverse files]

        filter_and_sort: func [list [block!] /local temp-list filters par temp-dir-list temp-files-list] [
            temp-dir-list: copy list
            if not get-face check-hidden [remove-each item temp-dir-list [find-any/match to-string item ".*"]]
            remove-each item temp-dir-list [not dir? item]
            sort_files temp-dir-list
            dirs-count: length? temp-dir-list
            if only-dirs [return temp-dir-list]

            ; apply filters
            filters: copy get-face choice-filter
            if par: find filters "(" [filters: next par]
            if par: find filters ")" [clear par]
            filters: parse filters ";"
            temp-list: copy []
            forall filters [
                gather-each/into item list [find-any/match item first filters] temp-list

            temp-files-list: copy temp-list
            if not get-face check-hidden [remove-each item temp-files-list [find-any/match to-string item ".*"]]
            remove-each item temp-files-list [dir? item]
            sort_files temp-files-list

            clear temp-list
            insert temp-files-list temp-dir-list
        add_folder: func [/local name][
            name: request-text/title/default/offset "Enter the new folder name below" "New folder" (screen-offset? btn-+) - 290x26
            unless none? name [attempt [make-dir path-name/:name replace_file-list path-name]]
        rename_file: func [/local scroller-pos old-name name] [
            if (length? list-of-files/picked) = 1 [
                scroller-pos: get-face list-of-files/sld
                old-name: first list-of-files/picked
                name: request-text/title/default/offset "Enter the new file name below" form old-name (screen-offset? btn-rename) - 220x26
                unless none? name [
                    attempt [
                        rename old-name to-rebol-file name
                        replace_file-list path-name
                        set-face/no-show list-of-files/sld scroller-pos
                        do-face list-of-files/sld none
                focus list-of-files ; to unfocus fields

        build_path-tree: func [/local path-tree paths n] [
            path-tree: copy []
            insert path-tree either on-win? [get-win-vols][read %/]
            remove-each item path-tree [error? try [read/part join %/ item 1]]
            forall path-tree [
                change path-tree to-local-file first path-tree
                if find "\/" last first path-tree [change path-tree head remove back tail first path-tree]
            sort path-tree

            paths: parse/all path-name "/"
            paths: next next paths
            n: 0
            forall paths [insert/dup first paths " " n: n + 2]
            if (length? head paths) >= 2 [
                insert next find path-tree second head paths paths

            head path-tree
        show_drop-list: func [face [object!]] [
            paths-list/data: build_path-tree
            show paths-list/update
            show-popup/window/away paths-lay face/parent-face
        select_folder: func [dir [string!] /local path] [
            path: find/tail copy path-name dirize trim dir
            dir: either path [dirize head clear path][to-file rejoin ["/" dir "/"]]
            if replace_file-list dir [add_to_undo-list]
    ; update, replace_file-list, enquote, select_line, undo

        update_list: func [/local file file-info] [
            file-list: filter_and_sort orig-file-list
            forall file-list [
                file: first file-list
                file: path-name/:file
                either file-info: info? file [
                    change/only file-list reduce [file-list/1 set-size file-info/size file-info/date]
                    change/only file-list reduce [file-list/1 "" ""]
            file-list: head file-list

            clear list-of-files/data
            ; update and redraw file names text-list
            append list-of-files/data file-list
            set-face list-of-files/sld 0 ; FIXME: remember and restore last scroller pos (in undo-list)
            show list-of-files/update

        replace_file-list: func [dir-name [file! none!] /init /local temp-dir-list current] [
            if error? try [temp-dir-list: read dir-name] [request/ok/type/offset "Can not read directory, please verify that the name is correct" 'alert req-win/offset + 100x100 return false]
            current: what-dir
            change-dir dir-name
            focus list-of-files ; to unfocus fields
            old-path-name: path-name
            unless any [init saving path-name = dir-name] [clear-face field-selected]
            path-name: dir-name
            clear orig-file-list
            orig-file-list: copy temp-dir-list
            set-face info-path to-local-file dir-name
            fn1/state: none ; reset this to avoid re-selecting when changing dir
            fn1/user-data: none ; reset
            clear list-of-files/picked
            if init [
                temp-dir-list: unique compose [(names)]
                forall temp-dir-list [alter list-of-files/picked to-file first temp-dir-list]
            show list-of-files/update
            change-dir current
        enclose: func [s [series!] vals][head insert tail insert copy s first vals last vals]
        enquote: func [s [series!]][enclose s {"}]    ;-- "

        set-size: func [value [integer!] /local num um bbb div index] [
            um: [" KB" " KB" " MB" " GB"]
            bbb: [1024 1024 1048576 1073741824]
            num: value
            if num = 0 [num: 1]
            div: pick bbb index: to-integer (log-2 num) / 10 + 1 
            value: value / div
            value: case [value = 0.0 [0] value < 0.1 [0.1] 'else [round/to value 0.1]]
            rejoin ["" value pick um index]
        find-data: func [data [block!] value /local item] [
            forall data [item: first data if find item value [return data]] 
        select_line: func [/key dir [word!] control /local path str old-index new-index files] [
            if empty? list-of-files/data [return false]
            focus list-of-files
            if empty? path: list-of-files/picked [
                if find [up down home end] dir [
                    ; try to select 1st file
                    append clear list-of-files/picked first pick list-of-files/data 1
                    show list-of-files/update
                    if not dir? first list-of-files/picked [set-face field-selected list-of-files/picked]
                    fn1/user-data: 1
                    return true
                return false
            path: first path
            either none? dir [
                case [
                    dir? path [
                        if replace_file-list path-name/:path [add_to_undo-list]
                    str: is-link? path-name/:path [ ; WARNING: THIS IS A DIRTY HACK!
                        str: back find-any/last str "?:" ; find a: b: c: etc. drive letters
                        str: to-string copy/part str find str #{00000000}
                        str: trim/with/all str {^@} ; trim 0s
                        if replace_file-list dirize to-rebol-file str [add_to_undo-list]
                    'else [
                        files: unique list-of-files/picked
                        if (length? files) > 1 [forall files [change files enquote first files]]
                        set-face field-selected files
                        return false
                dir: switch/default dir [
                        up [-1]
                        down [1]
                        ;page-up [negate visible-lines]
                        ;page-down [visible-lines]
                        home [-1000000] ; a great number
                        end [1000000] ; a great number
                    ] [return false]
                new-index: dir + old-index: any [fn1/user-data 0]
                new-index: min max 1 new-index length? list-of-files/data
                if new-index = old-index [return false]
                fn1/user-data: new-index ; set "key-cursor"
                unless control [clear list-of-files/picked]
                alter list-of-files/picked first pick list-of-files/data new-index
                show list-of-files/update
                either any[empty? list-of-files/picked dir? first list-of-files/picked] [
                    clear-face field-selected
                    files: unique list-of-files/picked
                    if (length? files) > 1 [forall files [change files enquote first files]]
                    set-face field-selected files
        select_line-letter: func [letter /local list line] [
            list: list-of-files/data
            if all [(length? list-of-files/picked) = 1 find/match first list-of-files/picked to-file letter] [list: next find-data list-of-files/data list-of-files/picked]
            forall list [
                if line: find/match first first list to-file letter [
                    fn1/user-data: index? list ; set "key-cursor"
                    line: head line
                    append clear list-of-files/picked line
                    show list-of-files/update
                    if not dir? first list-of-files/picked [set-face field-selected list-of-files/picked]
        add_to_undo-list: does [
            if old-path-name <> path-name [insert undo-list old-path-name]
        undo: does [
            if empty? undo-list [exit]
            insert redo-list path-name
            path-name: take undo-list
            replace_file-list path-name
        redo: does [
            if empty? redo-list [exit]
            insert undo-list path-name
            path-name: take redo-list
            replace_file-list path-name
    ; gui
        load-script-thru: func ["Load a script from www.rebol.org thru the cache"
            name [file!]
            /flash "Flash a message to the user"
            /warn "Alert user if script not found"
            /from path [file!] "Optional path where to search for the script"
            /local cache-name modul
            if not value? 'view-root [view-root: either system/version/4 = 3 [%/C/Users/Public/Documents] [%/tmp]]
            cache-name: view-root/:name
            modul: any [
                attempt [read cache-name] ; try the cache
                attempt [read name] ; try current dir
                attempt [read rejoin [undirize path "/" name]] ; try optional dir 
                attempt [ ; try downloading it from www.rebol.org
                    modul: rejoin [http://www.rebol.org/download-a-script.r?script-name= name]
                    read either flash [request-download/to modul cache-name cache-name][modul]
            if modul [clear back back tail modul: load modul] ; remove example code
            if all [not modul warn] [alert rejoin ["Script <" name "> not found."]]

        if not value? 'Add-tooltip-2-faces [; tooltip style already loaded?
            attempt [do load-script-thru/flash %simple-tooltip-style.r]
        fcnt: 0
        files: none
        ; make styles local
        info-path: arrow-d: btn-+: choice-sort: choice-order: btn-rename: list-of-files:
        field-selected: text-filter: choice-filter: check-hidden: btn-ok: btn-cancel: none
        fn1: fn2: fn3: fn4: none
        ticker-scroll: none
        file-req-styles: stylize [
            choice: choice white - 20  font [style: none size: 11 colors: [0.0.0 255.150.55] shadow: none] edge [size: 1x1]
            ticker: sensor 0x0 rate none feel [engage: func [face action event][if event/type = 'time [do-face face face/data none]]]
            files-list: panel [
                across space 0
                list [
                    across space 0x0
                    fn1: txt 280x16 no-wrap feel [
                        redraw: func [face action position] [
                            picked: face/parent-face/parent-face/parent-face/picked
                            face/color: either find picked face/text [yello][240.240.240]
                        over: func [face into position] [
                            if all [many into integer? face/state][
                                clear picked
                                if empty? list-of-files/data [exit]
                                for n face/state min fcnt length? list-of-files/data either fcnt > face/state [1][-1][
                                    if not dir? first pick list-of-files/data n [append picked first pick list-of-files/data n]
                                show list-of-files
                            if all [many integer? face/state][
                                case [
                                    position/y < (list-of-files/offset/y + 4) [ticker-scroll/set -1]
                                    position/y > (list-of-files/offset/y + list-of-files/size/y - fn1/size/y) [ticker-scroll/set 1]
                                    'else [ticker-scroll/stop]
                        engage: func [face action event] [
                            if fcnt > length? list-of-files/data [exit]
                            if event/double-click [
                                face/state: none
                            switch action [
                                down [
                                    either all [many event/shift] [
                                        if not event/control [clear picked]
                                        face/user-data: any [face/user-data fcnt]
                                        for n face/user-data min fcnt length? list-of-files/data either fcnt > face/user-data [1][-1][
                                            if not dir? first pick list-of-files/data n [append picked first pick list-of-files/data n]
                                        if any [not many dir? to-file face/text not event/control] [face/state: fcnt clear picked]
                                        alter picked face/text
                                    select_line ; update field-select and reshow
                                over [if integer? face/state [append clear picked face/text ]]
                                away [
                                    if all [many integer? face/state][
                                        case [
                                            all [event/offset/y < 0 (fcnt - list-of-files/top) = 1] [ticker-scroll/set -1]
                                            all [event/offset/y > 20 (fcnt - list-of-files/top) = to-integer (list-of-files/size/y / fn1/size/y)] [ticker-scroll/set 1]
                                up [
                                    face/state: none
                                    if not event/shift [face/user-data: fcnt]
                                    select_line ; update field-select and reshow

                    fn2: txt 60x16 right feel none
                    fn3: txt 80x16 right feel none
                    fn4: txt 55x16 right feel none
                ] supply [
                    fcnt: count: count + list-of-files/top
                    files: file-list
                    face/font/color: black
                    face/font/style: []
                    face/text: ""
                    if count > length? files [return none]
                    if all [index = 1 dir? files/:count/1] [face/font/color: blue face/font/style: 'bold]
                    if all [index = 1 is-link? join path-name files/:count/1] [face/font/color: blue]
                    face/text: do pick [
                        [either dir? files/:count/1 [""] [files/:count/2]]
                        [all [date? files/:count/3 files/:count/3/date]]
                        [all [date? files/:count/3 to-itime files/:count/3/time]]
                    ] index
                scroller with [list: none] [
                    list: face/parent-face
                    if face/user-data = value: max 0 to-integer value * ((length? list-of-files/data) - (list-of-files/size/y / fn1/size/y) + 1) [exit]
                        face/user-data: list-of-files/top: value
                        show list
                ticker-scroll: ticker (0x0 - sp) [either value > 0 [scroll-drag list-of-files/sld] [scroll-drag/back list-of-files/sld]] with [
                    stop: does [data: 0 rate: none show self]
                    set: func [dir][data: dir rate: 20 show self]
            ] with [
                data: copy []
                picked: copy []
                top: 0
                column1: none
                sld: none

                update: func [/local tot-rows visible-rows item] [
                    tot-rows: length? data visible-rows: to-integer (size/y / column1/size/y)
                    sld/redrag visible-rows / max 1 tot-rows
                    either visible-rows >= tot-rows [
                        sld/step: 0.0
                        sld/step: 1 / (tot-rows - visible-rows)
                        if column1/user-data [
                            sld/data: (column1/user-data) / tot-rows ; simple but it works
                            if sld/data < sld/step [sld/data: 0]
                            top: to-integer sld/data / sld/step
                    sld/page: sld/ratio / 1.5
                    do-face sld sld/data
                resize: func [new /x /y /local siz][
                    siz: new - size
                    either any [x y] [
                        if x [size/x: new]
                        if y [size/y: new]
                        size: any [new size]

                    sld/page: sld/ratio / 1.5

                    foreach [face pair] reduce [
                        fn2 1x0
                        fn3 1x0
                        fn4 1x0
                        pane/2 1x0
                    ][face/offset: face/offset + (siz * pair)]
                    foreach [face pair] reduce [
                        pane/1 1x1
                        pane/1/subface 1x0
                        fn1 1x0
                    ][face/size: face/size + (siz * pair)]
                    foreach [face pair] reduce [
                        pane/2 0x1
                    ][face/resize face/size + (siz * pair)]
                append init [
                    sld: pane/2
                    sld/parent-face: pane
                    column1: pane/1/subface/pane/1
                    pane/1/size: size - (pane/2/size * 1x0)
                    pane/1/subface/size/x: size/x
                    pane/2/offset: pane/1/offset + (pane/1/size * 1x0)
                    pane/2/resize/y size/y
        req-win: [
            do [sp: 4x4] origin sp space sp 
            styles file-req-styles
            style text text black feel none
            style btn btn 24x24 
            btn "<" [undo] help "Back to previous folder"
            btn ">" [redo] help "Forward"
            btn "^^"  [
                if not none? path-name [
                    replace_file-list parent-dir path-name
            ] help "Go up one folder"
            style field field white white edge [color: gray + 30 effect: 'ibevel size: 1x1] 
            info-path: field 365 [if replace_file-list dirize to-rebol-file face/text [add_to_undo-list]]
            pad (sp * -1x0)
            arrow-d: arrow down white 24x24 [show_drop-list face] help "Select a parent directory"
            btn-+: btn "+" 252.223.44 [add_folder] help "Create a new folder"
            text "Sort by"
            choice-sort: choice "Name" "Size" "Date" 100x20 [replace_file-list path-name]
            text "in"
            choice-order: choice "increasing" "decreasing" 100x20 [replace_file-list path-name]
            text "order"
            btn-rename: btn "Rename" 100x20 252.223.44 [rename_file] help "Rename selected file or folder"
            list-of-files: files-list 500x200
            field-selected: field 336
            pad 0x2 
            text-filter: text "Filter:" 
            pad 0x-2 
            choice-filter: choice "All files (*.*)" "Rebol files (*.r)" 120  [replace_file-list path-name]
            pad 0x10 
            check-hidden: check-line "Show hidden files" no [replace_file-list path-name]
            pad 172x0 
            btn-ok: btn "Select" 100x24 #"^M" [cancelled: false hide-popup]
            btn-cancel: btn "Cancel" 100 #"^(esc)" [set-face field-selected "" cancelled: true hide-popup]
            key keycode [left] (0x0 - sp) [if replace_file-list parent-dir path-name [add_to_undo-list]]
            key keycode [right] (0x0 - sp) [undo]
            key keycode [f2] (0x0 - sp) [rename_file]
            do [btn-rename/offset/x: btn-cancel/offset/x]
        req-win: layout req-win
        if on-win? [remove find req-win/pane check-hidden]
        remove find req-win/pane list-of-files
        insert tail req-win/pane list-of-files ; put on top (to hide lower styles)
        req-win/user-data: reduce ['size req-win/size]
        req-win/options: [resize min-size 500x306]
        if value? 'Add-tooltip-2-faces [Add-tooltip-2-faces req-win]
        field-selected/feel: ctx-text/edit ; restore this

        paths-lay: layout/offset [
            origin 0x0 at 0x0
            paths-list: text-list (info-path/size * 1x0 + arrow-d/size * 1x0 + 0x200) [select_folder value]
        ] info-path/offset + (info-path/size * 0x1)
        ; patch to avoid closing pop-up with scroll-wheel
        system/view/popface-feel-win-away: make system/view/popface-feel-win [
            process-outside-event: func [event] [
                unless find [move time active inactive scroll-line] event/type [hide-popup]
        resize-faces: func [siz [pair!]] [
            foreach [face pair] reduce [
                arrow-d 1x0
                btn-+ 1x0
                btn-rename 1x0
                field-selected 0x1
                text-filter 1x1
                choice-filter 1x1
                check-hidden 0x1
                btn-ok 1x1
                btn-cancel 1x1
            ][face/offset: face/offset + (siz * pair)]
            foreach [face pair] reduce [
                info-path 1x0
                field-selected 1x0
                paths-lay 1x0
                list-of-files 1x1
                paths-list 1x0
            ][either in face 'resize [face/resize face/size + (siz * pair)][face/size: face/size + (siz * pair)]]

        req-win/feel: make req-win/feel [
            detect: func [face event /local siz][
                if any [event/face = req-win event/face = paths-lay] [
                switch event/type [
                    close [set-face field-selected "" cancelled: true  hide-popup return none]
                    scroll-line [
                        either found? find req-win/pane paths-lay [
                            either event/offset/y >= 0 [scroll-drag/page paths-list/sld] [scroll-drag/page/back paths-list/sld]
                            either event/offset/y >= 0 [scroll-drag/page list-of-files/sld] [scroll-drag/page/back list-of-files/sld]
                    resize [
                        face: event/face
                        siz: face/size - face/user-data/size     ; compute size difference
                        face/user-data/size: face/size          ; store new size

                        resize-faces siz
                        show face
                    key [
                        if all [system/view/focal-face system/view/focal-face/feel = ctx-text/edit] [ ; editing has precedence
                            return event
                        if word? event/key [if select_line/key event/key event/control [return none]]
                        if all [event/key = #"^M" system/view/focal-face = list-of-files dir? any [pick list-of-files/picked 1 %a]] [if select_line [return none]]
                        if all [event/key = #"^M" system/view/focal-face = info-path] [if replace_file-list dirize to-rebol-file info-path/text [add_to_undo-list] return none]
                        if event/key = #"^M" [if "" = trim get-face field-selected [return none]]
                        select_line-letter event/key
                        if face: find-key-face face event/key [
                            if get in face 'action [do-face face event/key]
                            return none
    ; main
        path-name: none
        orig-file-list: ; the unsorted file list
        file-list: [] ; the sorted file list
        undo-list: copy []
        redo-list: copy []
        only-dirs: false
        dirs-count: 0
        many: true
        saving: false
        names: none
        cancelled: none

        set 'request_file func [
            "Requests a file using a popup list of files and directories."
            /title "Change heading on request."
                title-line "Title line of request"
                button-text "Button text for selection"
            /file name "Default file name or block of file names"
            /filter filt "Filter or block of filters"
            /keep "Keep previous settings and results"
            /only "Return only a single file, not a block."
            /path "Return absolute path followed by relative files."
            /save "Request file for saving, otherwise loading."
            /local result dir-path
            req-win/text: any [title-line "Select a File:"]
            many: not only
            if save [many: false]
            if all [not many block? name] [name: pick name 1]
            field-selected/text: any [all [name form name] ""]
            names: any [name []]
            if filt [
                filt: compose [(filt)]
                either on-win? [if not find form filt "*.*" [insert tail filt "All files (*.*)"]][insert tail filt "All files (*)"]
                choice-filter/text: first choice-filter/data: choice-filter/texts: filt
            btn-ok/text: any [button-text either save ["Save"]["Select"]]
            if only-dirs [list-of-files/resize list-of-files/size - 0x30]
            saving: to logic! save

            only-dirs: false
            replace_file-list/init any [path-name path-name: what-dir]

            show-popup req-win

            if none? keep [ ; restore defaults
                choice-filter/text: first choice-filter/data: choice-filter/texts: ["All files (*.*)" "Rebol files (*.r)"]
                choice-sort/text: first choice-sort/data: head choice-sort/data
                choice-order/text: first choice-order/data: head choice-order/data
                path-name: none
            result: get-face field-selected
            if "" = trim result [return none]
            if any [only #"^"" <> first result] [result: enquote result]
            ; convert string to block of files
            result: parse result none
            forall result [change result to-rebol-file first result]
            dir-path: dirize to-rebol-file get-face info-path
            if only [return join dir-path result/1]
            either path [
                insert result dir-path
                foreach file result [insert file dir-path]
            head result
        set 'request_dir func [
            "Requests a directory using a popup list."
            /title "Change heading on request." title-line
            /dir "Set starting directory" where [file!]
            /keep "Keep previous directory path"
            /offset xy [pair!]
            /local offs result
            req-win/text: any [title-line "Select a directory:"]
            if offset [offs: req-win/offset req-win/offset: xy]
            btn-ok/text: "Select" ; restore default value
            if not only-dirs [list-of-files/resize list-of-files/size + 0x30]

            only-dirs: true
            replace_file-list any [where path-name path-name: what-dir]

            show-popup req-win

            result: path-name
            if none? keep [ ; restore defaults
                req-win/offset: offs
                choice-sort/text: first choice-sort/data: head choice-sort/data
                choice-order/text: first choice-order/data: head choice-order/data
                path-name: none
            if cancelled [return none]

] ; value?

do ; just comment this line to avoid executing examples
if system/script/title = "Open a file or directory requester" [; script not started by some else script
probe request_file/keep/title/filter "gimme file" "Load" ["*.r; *.c" "files (*.s ; *.t)"]
probe request_dir/title/offset "gimme dir" 100x100
probe request_dir/title/offset "gimme dir" 100x100
probe request_file/only/path/title "gimme file again" "Get it"