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---------------------------------------------------------------------------
-- @author Julien Danjou <julien@danjou.info>
-- @copyright 2008 Julien Danjou
-- @release @AWESOME_VERSION@
---------------------------------------------------------------------------
-- Grab environment we need
local util = require("awful.util")
local tostring = tostring
local pairs = pairs
local ipairs = ipairs
local table = table
local setmetatable = setmetatable
local capi =
{
tag = tag,
screen = screen,
mouse = mouse,
client = client
}
--- Useful functions for tag manipulation.
module("awful.tag")
-- Private data
local data = {}
data.history = {}
data.tags = setmetatable({}, { __mode = 'k' })
-- History functions
history = {}
history.limit = 20
--- Move a tag to an absolute position in the screen[]:tags() table.
-- @param new_index Integer absolute position in the table to insert.
function move(new_index, target_tag)
local target_tag = target_tag or selected()
local scr = target_tag.screen
local tmp_tags = capi.screen[scr]:tags()
if (not new_index) or (new_index < 1) or (new_index > #tmp_tags) then
return
end
for i, t in ipairs(tmp_tags) do
if t == target_tag then
table.remove(tmp_tags, i)
break
end
end
table.insert(tmp_tags, new_index, target_tag)
capi.screen[scr]:tags(tmp_tags)
end
--- Add a tag.
-- @param name The tag name, a string
-- @param props The tags properties, a table
-- @return The created tag
function add(name, props)
local properties = props or {}
local newtag = capi.tag{name = name}
newtag.screen = properties.screen or capi.mouse.screen
for k, v in pairs(properties) do
setproperty(newtag, k, v)
end
return newtag
end
--- Create a set of tags and attach it to a screen.
-- @param names The tag name, in a table
-- @param screen The tag screen, or 1 if not set.
-- @param layout The layout or layout table to set for this tags by default.
-- @return A table with all created tags.
function new(names, screen, layout)
local screen = screen or 1
local tags = {}
for id, name in ipairs(names) do
table.insert(tags, id, add(name, {screen = screen,
layout = (layout and layout[id]) or
layout}))
-- Select the first tag.
if id == 1 then
tags[id].selected = true
end
end
return tags
end
--- Find a suitable fallback tag.
-- @param screen The screen number to look for a tag on. [mouse.screen]
-- @param target A table of tags we consider unacceptable. [selectedlist(scr)]
function find_fallback(screen, invalids)
local scr = screen or capi.mouse.screen
local t = invalids or selectedlist(scr)
for _, v in pairs(capi.screen[scr]:tags()) do
if not util.table.hasitem(t, v) then return v end
end
end
--- Delete a tag.
-- @param target_tag Optional tag object to delete. [selected()]
-- @param fallback_tag Tag to assign stickied tags to. [~selected()]
-- @return Returns true if the tag is successfully deleted, nil otherwise.
-- If there are no clients exclusively on this tag then delete it. Any
-- stickied clients are assigned to the optional 'fallback_tag'.
-- If after deleting the tag there is no selected tag, try and restore from
-- history or select the first tag on the screen.
function delete(target_tag, fallback_tag)
-- abort if no tag is passed or currently selected
local target_tag = target_tag or selected()
if target_tag == nil then return end
local ntags = #capi.screen[target_tag.screen]:tags()
local target_scr = target_tag.screen
-- We can't use the target tag as a fallback.
local fallback_tag = fallback_tag
if fallback_tag == target_tag then return end
-- No fallback_tag provided, try and get one.
if fallback_tag == nil then
fallback_tag = find_fallback(target_scr, {target_tag})
end
-- Abort if we would have un-tagged clients.
local clients = target_tag:clients()
if ( #clients > 0 and ntags <= 1 ) or fallback_tag == nil then return end
-- Move the clients we can off of this tag.
for _, c in pairs(clients) do
-- If a client has only this tag, or stickied clients with
-- nowhere to go, abort.
if (not c.sticky and #c:tags() == 1) or
(c.sticky and fallback_tag == nil) then
return
else
c:tags({fallback_tag})
end
end
-- delete the tag
target_tag.screen = nil
-- If no tags are visible, try and view one.
if selected(target_scr) == nil and ntags > 0 then
history.restore()
if selected(target_scr) == nil then
capi.screen[target_scr]:tags()[1].selected = true
end
end
return true
end
--- Update the tag history.
-- @param obj Screen object.
function history.update(obj)
local s = obj.index
local curtags = selectedlist(s)
-- create history table
if not data.history[s] then
data.history[s] = {}
else
if data.history[s].current then
-- Check that the list is not identical
local identical = true
for idx, tag in ipairs(data.history[s].current) do
if curtags[idx] ~= tag then
identical = false
break
end
end
-- Do not update history the table are identical
if identical then return end
end
-- Limit history
if #data.history[s] >= history.limit then
for i = history.limit, #data.history[s] do
data.history[s][i] = nil
end
end
end
-- store previously selected tags in the history table
table.insert(data.history[s], 1, data.history[s].current)
data.history[s].previous = data.history[s][1]
-- store currently selected tags
data.history[s].current = setmetatable(curtags, { __mode = 'v' })
end
--- Revert tag history.
-- @param screen The screen number.
-- @param idx Index in history. Defaults to "previous" which is a special index
-- toggling between last two selected sets of tags. Number (eg 1) will go back
-- to the given index in history.
function history.restore(screen, idx)
local s = screen or capi.mouse.screen
local i = idx or "previous"
local sel = selectedlist(s)
-- do nothing if history empty
if not data.history[s] or not data.history[s][i] then return end
-- if all tags been deleted, try next entry
if #data.history[s][i] == 0 then
if i == "previous" then i = 0 end
history.restore(s, i + 1)
return
end
-- deselect all tags
viewnone(s)
-- select tags from the history entry
for _, t in ipairs(data.history[s][i]) do
t.selected = true
end
-- update currently selected tags table
data.history[s].current = data.history[s][i]
-- store previously selected tags
data.history[s].previous = setmetatable(sel, { __mode = 'v' })
-- remove the reverted history entry
if i ~= "previous" then table.remove(data.history[s], i) end
end
--- Return a table with all visible tags
-- @param s Screen number.
-- @return A table with all selected tags.
function selectedlist(s)
local screen = s or capi.mouse.screen
local tags = capi.screen[screen]:tags()
local vtags = {}
for i, t in pairs(tags) do
if t.selected then
vtags[#vtags + 1] = t
end
end
return vtags
end
--- Return only the first visible tag.
-- @param s Screen number.
function selected(s)
return selectedlist(s)[1]
end
--- Set master width factor.
-- @param mwfact Master width factor.
function setmwfact(mwfact, t)
local t = t or selected()
if mwfact >= 0 and mwfact <= 1 then
setproperty(t, "mwfact", mwfact)
end
end
--- Increase master width factor.
-- @param add Value to add to master width factor.
function incmwfact(add, t)
setmwfact(getmwfact(t) + add, t)
end
--- Get master width factor.
-- @param t Optional tag.
function getmwfact(t)
local t = t or selected()
return getproperty(t, "mwfact") or 0.5
end
--- Set the number of master windows.
-- @param nmaster The number of master windows.
-- @param t Optional tag.
function setnmaster(nmaster, t)
local t = t or selected()
if nmaster >= 0 then
setproperty(t, "nmaster", nmaster)
end
end
--- Get the number of master windows.
-- @param t Optional tag.
function getnmaster(t)
local t = t or selected()
return getproperty(t, "nmaster") or 1
end
--- Increase the number of master windows.
-- @param add Value to add to number of master windows.
function incnmaster(add, t)
setnmaster(getnmaster(t) + add, t)
end
--- Set the tag icon
-- @param icon the icon to set, either path or image object
-- @param tag the tag
function seticon(icon, tag)
local tag = tag or selected()
setproperty(tag, "icon", icon)
end
--- Get the tag icon
-- @param t the tag
function geticon(tag)
local tag = tag or selected()
return getproperty(tag, "icon")
end
--- Set number of column windows.
-- @param ncol The number of column.
function setncol(ncol, t)
local t = t or selected()
if ncol >= 1 then
setproperty(t, "ncol", ncol)
end
end
--- Get number of column windows.
-- @param t Optional tag.
function getncol(t)
local t = t or selected()
return getproperty(t, "ncol") or 1
end
--- Increase number of column windows.
-- @param add Value to add to number of column windows.
function incncol(add, t)
setncol(getncol(t) + add, t)
end
--- View no tag.
-- @param Optional screen number.
function viewnone(screen)
local tags = capi.screen[screen or capi.mouse.screen]:tags()
for i, t in pairs(tags) do
t.selected = false
end
end
--- View a tag by its taglist index.
-- @param i The relative index to see.
-- @param screen Optional screen number.
function viewidx(i, screen)
local screen = screen and screen.index or capi.mouse.screen
local tags = capi.screen[screen]:tags()
local showntags = {}
for k, t in ipairs(tags) do
if not getproperty(t, "hide") then
table.insert(showntags, t)
end
end
local sel = selected(screen)
viewnone(screen)
for k, t in ipairs(showntags) do
if t == sel then
showntags[util.cycle(#showntags, k + i)].selected = true
end
end
capi.screen[screen]:emit_signal("tag::history::update")
end
--- Get a tag's index in the screen[]:tags() table.
-- @param query_tag The tag object to find. [selected()]
-- @return The index of the tag, nil if the tag is not found.
function getidx(query_tag)
local query_tag = query_tag or selected()
if query_tag == nil then return end
for i, t in ipairs(capi.screen[query_tag.screen]:tags()) do
if t == query_tag then
return i
end
end
end
--- View next tag. This is the same as tag.viewidx(1).
-- @param screen The screen number.
function viewnext(screen)
return viewidx(1, screen)
end
--- View previous tag. This is the same a tag.viewidx(-1).
-- @param screen The screen number.
function viewprev(screen)
return viewidx(-1, screen)
end
--- View only a tag.
-- @param t The tag object.
function viewonly(t)
local tags = capi.screen[t.screen]:tags()
-- First, untag everyone except the viewed tag.
for _, tag in pairs(tags) do
if tag ~= t then
tag.selected = false
end
end
-- Then, set this one to selected.
-- We need to do that in 2 operations so we avoid flickering and several tag
-- selected at the same time.
t.selected = true
capi.screen[t.screen]:emit_signal("tag::history::update")
end
--- View only a set of tags.
-- @param tags A table with tags to view only.
-- @param screen Optional screen number of the tags.
function viewmore(tags, screen)
local screen_tags = capi.screen[screen or capi.mouse.screen]:tags()
for _, tag in ipairs(screen_tags) do
if not util.table.hasitem(tags, tag) then
tag.selected = false
end
end
for _, tag in ipairs(tags) do
tag.selected = true
end
capi.screen[screen]:emit_signal("tag::history::update")
end
--- Toggle selection of a tag
-- @param tag Tag to be toggled
function viewtoggle(t)
t.selected = not t.selected
capi.screen[t.screen]:emit_signal("tag::history::update")
end
--- Get tag data table.
-- @param tag The Tag.
-- @return The data table.
function getdata(tag)
return data.tags[tag]
end
--- Get a tag property.
-- @param tag The tag.
-- @param prop The property name.
-- @return The property.
function getproperty(tag, prop)
if data.tags[tag] then
return data.tags[tag][prop]
end
end
--- Set a tag property.
-- This properties are internal to awful. Some are used to draw taglist, or to
-- handle layout, etc.
-- @param tag The tag.
-- @param prop The property name.
-- @param value The value.
function setproperty(tag, prop, value)
if not data.tags[tag] then
data.tags[tag] = {}
end
data.tags[tag][prop] = value
tag:emit_signal("property::" .. prop)
end
--- Tag a client with the set of current tags.
-- @param c The client to tag.
-- @param startup Optional: don't do anything if true.
function withcurrent(c, startup)
if startup ~= true and c.sticky == false then
if #c:tags() == 0 then
c:tags(selectedlist(c.screen))
end
end
end
local function attached_add_signal_screen(screen, sig, func)
capi.screen[screen]:add_signal("tag::attach", function (s, tag)
tag:add_signal(sig, func)
end)
capi.screen[screen]:add_signal("tag::detach", function (s, tag)
tag:remove_signal(sig, func)
end)
for _, tag in ipairs(capi.screen[screen]:tags()) do
tag:add_signal(sig, func)
end
end
--- Add a signal to all attached tag and all tag that will be attached in the
-- future. When a tag is detach from the screen, its signal is removed.
-- @param screen The screen concerned, or all if nil.
function attached_add_signal(screen, ...)
if screen then
attached_add_signal_screen(screen, ...)
else
for screen = 1, capi.screen.count() do
attached_add_signal_screen(screen, ...)
end
end
end
-- Register standards signals
capi.client.add_signal("manage", function(c, startup)
-- If we are not managing this application at startup,
-- move it to the screen where the mouse is.
-- We only do it for "normal" windows (i.e. no dock, etc).
if not startup
and c.type ~= "desktop"
and c.type ~= "dock"
and c.type ~= "splash" then
if c.transient_for then
c.screen = c.transient_for.screen
if not c.sticky then
c:tags(c.transient_for:tags())
end
else
c.screen = capi.mouse.screen
end
end
c:add_signal("property::screen", withcurrent)
end)
capi.client.add_signal("manage", withcurrent)
for s = 1, capi.screen.count() do
capi.screen[s]:add_signal("tag::history::update", history.update)
end
setmetatable(_M, { __call = function (_, ...) return new(...) end })
-- vim: filetype=lua:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:textwidth=80