Class: Typr::Browser

Inherits:
Grid show all
Defined in:
lib/browser.rb

Overview

A file-system directory browser built on Grid. Renders entries as rows with columns for name, symlink target, permissions, owner/group, size, timestamps, and MIME type. Directories sort to the top and appear in yellow; files get per-MIME-type foreground colors.

Column Views

:simple   - name
:compact  - name, size, type
:stats    - name, size, permissions, owner, group, modified
:full     - all columns

Navigation Keys (interactive picker)

[h]             | help
[r]             | reset view
[d]             | directory history
[m] / [M]       | mark / mark range
[a] / [i]       | mark all / invert mark
[`] / [~] / [..] | root / home / back
[v]             | switch view
[s] / [f]       | sort / filter
Return          | confirm (cd on directories)
Escape          | quit, returns nil

Constant Summary

Constants included from Typr

COLORS, COLOR_MAP, DEFAULT_KEYS, ERASE_LINE, INPUT, KEY_ESCAPE, KEY_PAGEDOWN, KEY_PAGEUP, KEY_RETURN, KEY_TAB, MIMETYPES, MODES, MOUSE_OFF, MOUSE_ON, ORIG_COLORS, TERMINFO

Instance Attribute Summary collapse

Attributes inherited from Grid

#align, #data, #filters, #format, #map, #procs, #rawfilter, #rawsort, #reverse, #sequence

Attributes inherited from Stack

#header, #hints, #hints_start, #keymap, #modifier, #selected, #separator, #start

Attributes inherited from Space

#borders, #colors, #interval, #left, #margin, #right

Instance Method Summary collapse

Methods inherited from Grid

#<<, #[], #[]=, #add_filter, #clear, #columns, #filter, #header=, #ids, #is_hash?, #page, #positions, #print, #reset, #rows, #sort_by, #sorted_by, #width_for

Methods inherited from Stack

#cycle, #down, #draw_hints, #headspace, #height, #hit, #page, #page_down, #page_up, #print, #reset, #to_bottom, #to_top, #up

Methods inherited from Space

#border=, #draw_border, #height, #start, #stop, #symbolize, #width

Methods included from Typr

#background, clear, #clip, #coerce_type, #color, #color_code, column, decode_mouse, #draw, exit, #fade, #foreground, #get_background, #get_foreground, height, init, #mode, #mode_code, #move, #move_code, on_resize, position, #prepare, read_key, read_line, #real_size, row, #sanitize, size, slice_width, text_width, width, word_next, word_prev

Constructor Details

#initialize(args = {}) ⇒ Browser

Construct a Browser widget. Keyword arguments:

Option               | Default                         | Description
--------------------|---------------------------------|-----------------------------------
+directory+          | +"~"+                           | Starting directory to browse
+mimetype_db+       | true                            | Load MIME from file extensions
+mimetype_magic+    | true                            | Use +file --mime-type+ for unknowns
+colors[:actions]+  | { "[f]ilter": :red, ... }       | Status bar item colors
+colors[:dir_history]+ | :yellow                      | History picker column color
+colors[:types]+     | (see below)                    | Per MIME-type foreground color

Type Color Defaults

image: :blue          audio: :green         video: :cyan
text: 146             pdf: 136              inode: :magenta
directory: :yellow    symlink: 123          'x-empty': :grey70
'x-msdownload': :red  'x-pie-executable': :red


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# File 'lib/browser.rb', line 415

def initialize args={}
  @mimetype_db, @mimetype_magic = true, true
  @view, @sort, @views, @positions, @show_hidden = :compact, 0, {}, {}, false
  @filter_dirs = args[:filter_dirs]
  super
  @left ||= 0
  @top ||= 0
  @directory ||= ?~
  @colors[:actions] = { "[f]ilter": :red, "[s]ort": :blue, "[v]iews": :green
    }.merge @colors[:actions] || {}
  @colors[ :types ] = {
        image: :blue,
        audio: :green,
        video: :cyan,
         text: 146, pdf: 136, 'epub+zip': 136,
         html: 150, xhtml: 150, javascript: 150,
    'x-bzip2': 190, 'x-xz': 190, 'x-compressed': 190,
        inode: :magenta, blockdevice:148, chardevice:144, symlink:123,
    directory: :yellow,
    'x-empty': :grey70, '?': :grey70,
    'x-msdownload': :red, 'x-pie-executable': :red
  }.merge( @colors[ :types ] || {} )

  @keymap = { back: KEY_BACKSPACE, confirm: KEY_RETURN, help: ?h,
    home: ?~, views: ?v,         sort_view: ?s, search: ?/,
    mark: ?m, mark_range: ?M, mark_all: ?a, mark_invert: ?i,
    filter_view: ?f, reset_view: ?r,
    toggle_hidden: ?H}.merge @keymap

  self.header = %w[ name target permissions executable owner group size
    accessed modified created type subtype ]

  @format[NAME] = :max
  @format[TYPE] = 5
  @ignore[NAME] = @ignore[TARGET] = true
  @hints = "1234567890"
  [NAME, SIZE, ACCESSED, MODIFIED, CREATED].each{|col| @rawsort[col] = true}

  @procs[ACCESSED] = @procs[MODIFIED] = @procs[CREATED] = :datetime
  @procs[SIZE] = :magnitudes
  @procs[OWNER] = Proc.new{|uid| Etc.getpwuid(uid).name rescue uid }
  @procs[GROUP] = Proc.new{|gid| Etc.getgrgid(gid).name rescue gid }

  @procs[NAME] = Proc.new{ |name, row| target = @data[row][TARGET]
    File.basename(name.to_s) + ( target ? " > " + color_code(File.exist?(target) ? :green : :red) +
      target : "" ) }

  @views = { simple: %i[ name ],
    compact: %i[ name size type],
    stats:   %i[ name size permissions owner group modified ],
    full:    %i[ name size permissions executable owner group
                 accessed modified created type subtype ] }.merge @views
  @parent = self
  @head ||= Grid.new( parent:self, left: ->{@parent.left}, margin: '',
    right: ->{@parent.width + @parent.left - 1}, top: ->{@parent.top-1},
    input: [ [->{Etc.getpwuid(Process.euid).name rescue ENV["USER"] || Etc.getlogin}, ->{@parent.directory},
      ->{@parent.filter_display},
      ->{ (s = @parent.sorted_by(true)) &&
        "#{s} #{@parent.reverse ? "\u2193" : "\u2191"}"},
      ->{@parent.view} ] ], format: [:min, :max, :min, :min, :min],
    colors: { columns: [@colors[:default], @colors[:default],
      @colors[:actions][:"[f]ilter"], @colors[:actions][:"[s]ort"],
      @colors[:actions][:"[v]iews"]] } )

  @user ||= Line.new( parent:self, left:->{@parent.left},top:->{@parent.bottom+1},
    bindings: %w[ [h]elp [/]:search ] + @colors[:actions].map{|name,color|
      color_code( color ) + name.to_s + color_code(@colors[:default]) } +
        %w[ [r]eset [d]irectories [m]ark [M]ark_range mark_[a]ll
        [i]nvert_mark [~]:home [H]idden_files [back]:.. [up] [down] [pageup] [pagedown] [home] [end] [esc]:quit [return]:confirm\  ])
  cd @directory
end

Instance Attribute Details

#directory ⇒ Object

Returns the value of attribute directory.



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# File 'lib/browser.rb', line 36

def directory
  @directory
end

#mimetype_db ⇒ Object

Returns the value of attribute mimetype_db.



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# File 'lib/browser.rb', line 37

def mimetype_db
  @mimetype_db
end

#mimetype_magic ⇒ Object

Returns the value of attribute mimetype_magic.



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# File 'lib/browser.rb', line 37

def mimetype_magic
  @mimetype_magic
end

#pwd ⇒ Object

Returns the value of attribute pwd.



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# File 'lib/browser.rb', line 36

def pwd
  @pwd
end

#user ⇒ Object

Returns the value of attribute user.



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# File 'lib/browser.rb', line 36

def user
  @user
end

#view ⇒ Object

Returns the value of attribute view.



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# File 'lib/browser.rb', line 36

def view
  @view
end

Instance Method Details

#back ⇒ Object

Navigate up one directory.

browser.back   # equivalent to cd ".."


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# File 'lib/browser.rb', line 204

def back; cd ".." end

#bottom ⇒ Object

Height minus 2 rows reserved for path bar and command line.



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# File 'lib/browser.rb', line 41

def bottom; super - 1 end

#cd(dir, append = false) ⇒ Object

Change to dir (absolute path, "..", "~", or integer index into dir_history). When append is false (default), clears data and colors before scanning. Pushes onto dir_history.

browser.cd "/tmp"        # => changes to /tmp
browser.cd "~"           # => changes to home
browser.cd ".."          # => parent directory
browser.cd 2             # => jump to history entry 2


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# File 'lib/browser.rb', line 57

def cd dir, append=false
  return unless dir
  data, missing = [],{}
  unless append
    @colors[:fields] = {}
    clear
    Dir.chdir( @directory = File.expand_path( dir ) )
  end
  data = Dir.new(@directory).children.reject{|f|
    !@show_hidden and f[0] == ?. }.map { |file| scan_file file }

  data.each_with_index{ |row, id|
    file = row[NAME]
    ftype = File.ftype(file) rescue next
    ftype = File.stat(file).ftype if ftype == 'link' and File.exist?(file)
    mime = { 'directory' => 'inode/directory', 'characterSpecial' => 'inode/chardevice',
      'blockSpecial' => 'inode/blockdevice', 'link' => 'inode/symlink',
      'fifo' => 'inode/fifo', 'socket' => 'inode/socket' }[ftype]
    unless mime
      if @mimetype_db and ext = file.match(/.+\.(\w+)$/)
        mime = MIMETYPES[ext[1].to_sym]
      end
      missing[file] = id unless mime
    end
    row[-2,2] = mime.to_s.split( ?/ ) if mime
  }

  if @mimetype_magic and missing.any?
    begin
      out = IO.popen(['file', '--mime-type', *missing.keys]){ |io| io.read }
    rescue Errno::ENOENT
      out = ''
    end
    out.split($/).each{ |line|
      file, mime = line.match(/^(.*):\s+(\w+\/[\w\-\.]+)$/)&.captures
      next unless file
      data[ missing[file] ][-2,2] = mime.split( ?/ ) if missing[file] }
  end
  data.each { |row| row[0] = File.join(@directory, row[0]) }
  self << data
  sort
  filter
  unless append
    @directory += ?/ unless @directory == ?/
    change_view @view
    reset :position
  end
  return
end

#change_view(view = nil) ⇒ Object

Switch to a named or indexed column view. Resets format widths.

browser.change_view :full      # all columns
browser.change_view 0          # first view key
browser.change_view :stats     # name, size, perms, owner, group, modified


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# File 'lib/browser.rb', line 147

def change_view view=nil
  return unless view
  view = @views.keys[ view ] if view.is_a? Integer
  @sequence = @views[ view ].map{|title| @header.index title.to_s}
  reset :format
  @view = view
  return
end

#check(row) ⇒ Object

True when the row is a directory or passes base Grid filtering.

browser.check 0   # => true if navigable


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# File 'lib/browser.rb', line 271

def check row; super or ( !@filter_dirs and @data[row][SUBTYPE] == "directory" ) end

#confirm ⇒ Object

Returns the current directory path as the confirm result.



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# File 'lib/browser.rb', line 171

def confirm; return @directory end

#directories ⇒ Object

Returns row ids for all directories in the current listing.

browser.directories   # => [0, 1, 3]


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# File 'lib/browser.rb', line 365

def directories; ids.select{ |id| @data[id][SUBTYPE] == 'directory' } end

#filter_display ⇒ String

Formats active filters as 'column: query', joined by ' / '.

browser.filter_display  # => "name: foo / size: big"

Returns:

  • (String) 


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# File 'lib/browser.rb', line 353

def filter_display
  return "no filter" if @filters.empty?
  @filters.map { |col, q|
    q = "/#{q.source}/" if q.is_a?(Regexp)
    "#{col.is_a?(Symbol) ? col : @header[col] || col}:#{q}"
  }.join(" / ")
end

#filter_view ⇒ Object

Open a filter popup on the chosen row/column and apply the input.

browser.filter_view   # prompts for filter text


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# File 'lib/browser.rb', line 242

def filter_view; add_filter *@user.ask(
filter: [ popup( type: :"[f]ilter" ), :row, NAME, { column: 0 }], with: :line ) end

#help ⇒ Object

Display a help grid listing all keybindings.



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# File 'lib/browser.rb', line 229

def help; @user.help end

#home ⇒ Object

Navigate to the home directory.

browser.home   # => cd "~"


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# File 'lib/browser.rb', line 216

def home; cd ?~ end

#mark ⇒ Object

Prompts to select rows by index. Returns chosen ids or nil.

browser.mark   # => [0, 2, 5] or nil


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# File 'lib/browser.rb', line 177

def mark; return @user.ask( 'mark files': [self, :rows] ) end

#mark_all ⇒ Object

Selects all non-directory rows.

browser.mark_all   # => [0, 3, 7] (file ids only)


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# File 'lib/browser.rb', line 192

def mark_all; return @selected[:rows] = ids - directories end

#mark_invert ⇒ Object

Inverts selection across all non-directory rows.

browser.mark_invert   # => toggled ids


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# File 'lib/browser.rb', line 198

def mark_invert; return @selected[:rows] = ids - @selected[:rows] end

#mark_range ⇒ Object

Toggles selection for every row within a "from..to" range.

browser.mark_range   # prompts for from/to, toggles selection


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# File 'lib/browser.rb', line 183

def mark_range; return ids[ ( eval @user.ask(
      'mark from': [self, :relative_row], 'to': [self, :relative_row]
      ).join '..' ) ].each{|id| @selected[:rows].include?(id) ?
@selected[:rows].delete(id) : @selected[:rows] << id } end

#pick(type = 'file', **kw) ⇒ Object

Interactive file/directory picker. Blocks until a selection or Escape. Return on a file yields its raw absolute path; multi-select joins the chosen paths double-quoted with spaces. Enter on a directory triggers cd. type optionally filters by MIME family (audio, video, image, text, application, inode). Mouse: left-click a row to pick it; wheel up/down scrolls the listing.

browser.pick              # => /home/user/file.txt
browser.pick 'image'      # => /path/to/photo.png (images only)
browser.pick nil          # => anything, same as 'file'


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# File 'lib/browser.rb', line 285

def pick type='file', **kw
  type ||= 'file'
  type = type.to_s
  return super(type, **kw) if type[/row|column|field|none/]
  types = %w[audio video image text application inode]
  add_filter( types.include?( type ) ? TYPE : SUBTYPE, type ) if type == 'directory' or types.include?( type )
  loop do
    show
    draw_hints :row
    key = Typr.read_key
    if key == @keymap[:exit]
      @filters.clear
      sort
      return
    end
    if key == @keymap[:confirm] and type == 'directory'
      @filters.clear
      sort
      return @directory
    end
    if key.is_a?(Typr::Mouse)
      if key.wheel? and key.press?
        send( key.wheel_up? ? @keymap[:up] : @keymap[:down] )
        next
      elsif key.press? and key.left? and choice = hit( key.y, key.x )
      else next end
    else
      next unless choice = send( key )
    end
    case choice
      when Array; choice = choice.map{ |id| @data[id][NAME] }.join('" "')
      when Integer; file = @data[ choice ]
        if file[SUBTYPE] == 'directory'; cd file[TARGET] || file[NAME]; next
        else choice = file[NAME] end
    end
    @filters.clear
    sort
    return choice
  end
end

#popup(args = {}) ⇒ Object

Create a small Grid popup under an info bar item for column selection. args must include :type matching an actions key for positioning.

browser.popup type: :"[s]ort"   # sort-picker popup


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# File 'lib/browser.rb', line 387

def popup args={}
  Grid.new( { alternate:false, border: :light,
    borders:{ top:nil, top_left:nil, top_right:nil },
    top: top, align: [:right], input:@header,
    left: left + ( @positions[args[:type]] || 0 ) -
      ( args[:input] || @header ).map( &:size ).max - 1,
    colors:{ columns: [ @colors[:actions][args[:type]] ] } }.merge args )
end

#process(row) ⇒ Object

Colors symlink names green/red based on target existence and applies per-MIME-type foreground colors from @colors[:types].

browser.process 0   # => sets colors for row 0


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# File 'lib/browser.rb', line 134

def process row; super
  color = @colors[:types][@data[row][SUBTYPE].to_sym] ||
    @colors[:types][@data[row][TYPE].to_sym]
  @colors[:fields][[row,NAME]] = color if color
end

#reset_view ⇒ Object

Reset display, selection, and position state then re-sort.

browser.reset_view


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# File 'lib/browser.rb', line 236

def reset_view; cd @directory; reset [:display, :selection, :position]; sort end

#root ⇒ Object

Navigate to the root directory.

browser.root   # => cd "/"


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# File 'lib/browser.rb', line 210

def root; cd ?/ end

#scan_file(file) ⇒ Object

Build a row for a single directory entry from filesystem metadata only. MIME type detection (extension database and file --mime-type) happens in a batch pass inside #cd; type/subtype are left as "?" here.

browser.scan_file "image.png"   # => 12-column row


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# File 'lib/browser.rb', line 114

def scan_file file
  target = nil
  if File.symlink? file
    target = File.readlink( file ) rescue $!.to_s
    return [file, target, "????", false, "?", "?", 0, 0, 0, 0, "?", "?"] unless File.exist?(file)
  end
  stat = File.stat(file) rescue nil
  return [file, "", "????", false, "?", "?", 0, 0, 0, 0, "?", "?"] unless stat
  [  file, target, stat.mode.to_s(8)[-3..-1].chars.map{|d|
    "rwx".chars.map.with_index{|c,i| d.to_i[2-i]==0 ? ?- : c } }.join,
    ( File.executable?(file) and stat.file? ), stat.uid, stat.gid, stat.size,
    stat.atime.to_i, stat.mtime.to_i, stat.ctime.to_i, "?", "?" ]
end

#search ⇒ Object

Open live / search filtered on the name column.

browser.search   # type to narrow, Escape restores, Enter commits


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# File 'lib/browser.rb', line 249

def search
  @suppress_user = true
  pick :none, column: NAME
  @suppress_user = false
end

#send(key) ⇒ Object

Resolves hint characters typed on a row. Returns the matching row id for fast navigation, otherwise falls through to Stack#send.

browser.send "1"   # => row id if hint "1" is visible


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# File 'lib/browser.rb', line 162

def send key
  if key.is_a?(String) and
    id = @hints[0..[height, rows-1+headspace].min-@hints_start-1].index(key)
    return page[id+@hints_start]
  else super end
end

#show ⇒ Object

Renders the grid with an info bar above showing the current directory path and colored status items for filter, sort, and view.

browser.show   # shows browser with info bar


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# File 'lib/browser.rb', line 332

def show; super
  user = Etc.getpwuid(Process.euid).name rescue ENV["USER"] || Etc.getlogin
  @head.colors[:columns][0] = user == "root" ? [:red, :black] : [:green, :black]
  @head.reset :format
  @head.show
  move @head.positions(0)[1] - @head.separator.size, @parent.top - 1
  color @colors[:default]
  draw '@'
  @positions = { :"[f]ilter" => 2, :"[s]ort" => 3, :"[v]iews" => 4
    }.transform_values do |col|
      @head.left + @head.positions(0)[col] + @head.width_for(col) - 1
    end
  @user.show unless @suppress_user
end

#sort ⇒ Object

Sort by NAME by default; directories always appear before files within each prefix grouping.

browser.sort   # re-sorts with dirs first


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# File 'lib/browser.rb', line 373

def sort
  @sort ||= NAME
  super
  dirs = ids.select{ |id| @data[id][SUBTYPE] == 'directory' }
  @map = (directories + ids).uniq
  nil
end

#sort_view ⇒ Object

Open a sort-picker popup to choose a column to sort by.

browser.sort_view   # pick a column header to sort


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# File 'lib/browser.rb', line 259

def sort_view; sort_by @user.ask( "sort by": [ popup( type: :"[s]ort" ), :row, nil, { column: 0 }] ) end

#toggle_hidden ⇒ Object

Toggle visibility of hidden files (those starting with a dot).

browser.toggle_hidden


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# File 'lib/browser.rb', line 222

def toggle_hidden
  @show_hidden = !@show_hidden
  cd @directory
end

#top ⇒ Object

Top offset plus one row for the path info bar.



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# File 'lib/browser.rb', line 45

def top; super + 1 end

#views ⇒ Object

Open a view-picker popup and switch to the selected view.

browser.views   # choose :simple, :compact, :stats, or :full


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# File 'lib/browser.rb', line 265

def views; change_view( popup( type: :"[v]iews", input: @views.keys ).pick( :row, column: 0 ) )  end