Keyboard: add Bengali Probhat layout (#8887)

Add keyboard with Bengali Probhat layout.
Bump koreader-fonts for added Noto Sans Bengali UI,
and include it among our fallback fonts.

frontend/document/credocument.lua

@@ -51,6 +51,7 @@ local CreDocument = Document:new{
         "Noto Sans CJK SC",
         "Noto Naskh Arabic",
         "Noto Sans Devanagari UI",
+        "Noto Sans Bengali UI",
         "FreeSans",
         "FreeSerif",
         "Noto Serif",

frontend/fontlist.lua

@@ -40,8 +40,8 @@ local kindle_fonts_blacklist = {
     ["NotoNaskhArabicUI-Regular.ttf"] = true,
     ["NotoNaskh-Bold.ttf"] = true,
     ["NotoNaskh-Regular.ttf"] = true,
-    ["NotoSansBengali-Regular.ttf"] = true,
     ["NotoSansDevanagari-Regular.ttf"] = true,
+    ["NotoSansBengali-Regular.ttf"] = true,
     ["NotoSansGujarati-Regular.ttf"] = true,
     ["NotoSansKannada-Regular.ttf"] = true,
     ["NotoSansMalayalam-Regular.ttf"] = true,

frontend/ui/data/keyboardlayouts/bn_keyboard.lua

@@ -0,0 +1,215 @@
+local bn_popup = require("ui/data/keyboardlayouts/keypopup/bn_popup")
+local pco = bn_popup.pco
+local cop = bn_popup.cop
+local cse = bn_popup.cse
+local sec = bn_popup.sec
+local quo = bn_popup.quo
+-- Bengali letters
+local _da_ = bn_popup._da_
+local _dha_ = bn_popup._dha_
+local _U_kaar_ = bn_popup._U_kaar_
+local _U_ = bn_popup._U_
+local _I_kaar_ = bn_popup._I_kaar_
+local _I_ = bn_popup._I_
+local _ra_ = bn_popup._ra_
+local _rda_ = bn_popup._rda_
+local _Ta_ = bn_popup._Ta_
+local _Tha_ = bn_popup._Tha_
+local _e_ = bn_popup._e_
+local _oi_ = bn_popup._oi_
+local _u_kaar_ = bn_popup._u_kaar_
+local _u_ = bn_popup._u_
+local _i_kaar_ = bn_popup._i_kaar_
+local _i_ = bn_popup._i_
+local _o_ = bn_popup._o_
+local _ou_ = bn_popup._ou_
+local _pa_ = bn_popup._pa_
+local _pha_ = bn_popup._pha_
+local _e_kaar_ = bn_popup._e_kaar_
+local _oi_kaar_ = bn_popup._oi_kaar_
+local _o_kaar_ = bn_popup._o_kaar_
+local _ou_kaar_ = bn_popup._ou_kaar_
+local _aa_kaar_ = bn_popup._aa_kaar_
+local _a_ = bn_popup._a_
+local _sa_ = bn_popup._sa_
+local _sHa_ = bn_popup._sHa_
+local _Da_ = bn_popup._Da_
+local _Dha_ = bn_popup._Dha_
+local _ta_ = bn_popup._ta_
+local _tha_ = bn_popup._tha_
+local _ga_ = bn_popup._ga_
+local _gha_ = bn_popup._gha_
+local _ha_ = bn_popup._ha_
+local _bisarga_ = bn_popup._bisarga_
+local _ja_ = bn_popup._ja_
+local _jha_ = bn_popup._jha_
+local _ka_ = bn_popup._ka_
+local _kha_ = bn_popup._kha_
+local _la_ = bn_popup._la_
+local _anuswara_ = bn_popup._anuswara_
+local _jya_ = bn_popup._jya_
+local _ya_ = bn_popup._ya_
+local _sha_ = bn_popup._sha_
+local _Rha_ = bn_popup._Rha_
+local _cha_ = bn_popup._cha_
+local _Cha_ = bn_popup._Cha_
+local _aa_ = bn_popup._aa_
+local _rwi_ = bn_popup._rwi_
+local _ba_ = bn_popup._ba_
+local _bha_ = bn_popup._bha_
+local _na_ = bn_popup._na_
+local _Na_ = bn_popup._Na_
+local _ma_ = bn_popup._ma_
+local _uma_ = bn_popup._uma_
+local _rwi_kaar_ = bn_popup._rwi_kaar_
+local _chandrabindu_ = bn_popup._chandrabindu_
+local com2 = bn_popup.com2
+local daari = bn_popup.daari
+local hashanto = bn_popup.hashanto
+local question2 = bn_popup.question2
+
+-- other
+local _1_ = bn_popup._1_ -- numeric key 1
+local _1p = bn_popup._1p -- numeric key 1, popup sibling (they have north swipe ups of each other, the rest is the same)
+local _1n = bn_popup._1n -- numpad key 1
+local _1s = bn_popup._1s -- superscript key 1
+local _2_ = bn_popup._2_
+local _2p = bn_popup._2p
+local _2n = bn_popup._2n
+local _2s = bn_popup._2s
+local _3_ = bn_popup._3_
+local _3p = bn_popup._3p
+local _3n = bn_popup._3n
+local _3s = bn_popup._3s
+local _4_ = bn_popup._4_
+local _4p = bn_popup._4p
+local _4n = bn_popup._4n
+local _4s = bn_popup._4s
+local _5_ = bn_popup._5_
+local _5p = bn_popup._5p
+local _5n = bn_popup._5n
+local _5s = bn_popup._5s
+local _6_ = bn_popup._6_
+local _6p = bn_popup._6p
+local _6n = bn_popup._6n
+local _6s = bn_popup._6s
+local _7_ = bn_popup._7_
+local _7p = bn_popup._7p
+local _7n = bn_popup._7n
+local _7s = bn_popup._7s
+local _8_ = bn_popup._8_
+local _8p = bn_popup._8p
+local _8n = bn_popup._8n
+local _8s = bn_popup._8s
+local _9_ = bn_popup._9_
+local _9p = bn_popup._9p
+local _9n = bn_popup._9n
+local _9s = bn_popup._9s
+local _0_ = bn_popup._0_
+local _0p = bn_popup._0p
+local _0n = bn_popup._0n
+local _0s = bn_popup._0s
+local sla = bn_popup.sla
+local sl2 = bn_popup.sl2
+local eql = bn_popup.eql
+local eq2 = bn_popup.eq2
+local pls = bn_popup.pls
+local pl2 = bn_popup.pl2
+local mns = bn_popup.mns
+local mn2 = bn_popup.mn2
+local dsh = bn_popup.dsh
+local dgr = bn_popup.dgr
+local tpg = bn_popup.tpg
+local mth = bn_popup.mth
+local mt2 = bn_popup.mt2
+local int = bn_popup.int
+local dif = bn_popup.dif
+local df2 = bn_popup.df2
+local ls1 = bn_popup.ls1
+local ls2 = bn_popup.ls2
+local mr1 = bn_popup.mr1
+local mr2 = bn_popup.mr2
+local pdc = bn_popup.pdc
+local pd2 = bn_popup.pd2
+local bar = bn_popup.bar
+local prm = bn_popup.prm
+local hsh = bn_popup.hsh
+local hs2 = bn_popup.hs2
+
+return {
+    min_layer = 1,
+    max_layer = 4,
+    shiftmode_keys = { [""] = true },
+    symbolmode_keys = { ["⌥"] = true },
+    utf8mode_keys = { ["🌐"] = true },
+    -- Width of any key can be modified by adding "width = 1.0, " in the list.
+    keys = {
+        -- First row
+        { --   R    r    S    s
+            { _1p, _1_, "`", "!", },
+            { _2p, _2_, "‘", "¡", },
+            { _3p, _3_, "’", dsh, },
+            { _4p, _4_, "“", "_", },
+            { _5p, _5_, "”", quo, },
+            { _6p, _6_, eq2, eql, },
+            { _7p, _7_, _7s, _7n, },
+            { _8p, _8_, _8s, _8n, },
+            { _9p, _9_, _9s, _9n, },
+            { _0p, _0_, mn2, mns, },
+        },
+        -- Second row
+        { --   R    r    S    s
+            { _dha_, _da_, dif, "?",  width = 0.833},
+            { _U_, _U_kaar_, int, "¿", width = 0.833},
+            { _I_, _I_kaar_, mth, "~", width = 0.833},
+            { _rda_, _ra_, mt2, "\\", width = 0.833},
+            { _Tha_, _Ta_, df2, bar, width = 0.833},
+            { _oi_, _e_, sl2, sla, width = 0.833},
+            { _u_, _u_kaar_, _4s, _4n, width = 0.833},
+            { _i_, _i_kaar_, _5s, _5n, width = 0.833},
+            { _ou_, _o_, _6s, _6n, width = 0.833},
+            { _pha_, _pa_, pl2, pls, width = 0.833},
+            { _oi_kaar_, _e_kaar_, "[", "{", width = 0.833},
+            { _ou_kaar_, _o_kaar_, "]", "}", width = 0.833},
+        },
+
+        -- Third row
+        { --   R    r    S    s
+            { _a_, _aa_kaar_, ls2, ls1, },
+            { _sHa_, _sa_, mr2, mr1, },
+            { _Dha_, _Da_, dgr, "(", },
+            { _tha_, _ta_, tpg, ")", },
+            { _gha_, _ga_, hs2, hsh, },
+            { _bisarga_, _ha_, pd2, pdc, },
+            { _jha_, _ja_, _1s, _1n, },
+            { _kha_, _ka_, _2s, _2n, },
+            { _anuswara_, _la_, _3s, _3n, },
+            { sec, cse, sec, cse, }, -- comma/semicolon with CSS popup block
+        },
+        -- Fourth row
+        { --   R    r    S    s
+            { label = "", width = 0.9 }, -- Shift
+            { _ya_, _jya_, prm, "{", width = 0.82},
+            { _Rha_, _sha_, "°", "}", width = 0.82},
+            { _Cha_, _cha_, "«", "[", width = 0.82},
+            { _rwi_, _aa_, "»", "]", width = 0.82},
+            { _bha_, _ba_, _0s, _0n, width = 0.82},
+            { _Na_, _na_, "↑", "↑", width = 0.82},
+            { _uma_, _ma_, "↓", "↓", width = 0.82},
+            { _rwi_kaar_, com2, "়", "ৄ", width = 0.82},
+            { _chandrabindu_, daari, "ৠ", "ৡ", width = 0.82},
+            { question2, hashanto, "ৰ", "ৱ", width = 0.82},
+            { label = "", width = 0.9 }, -- Backspace
+        },
+        -- Fifth row
+        { --   R    r    S    s
+            { label = "⌥", width = 1.5, bold = true, alt_label = "SYM"}, -- SYM key
+            { label = "🌐", }, -- Globe key
+            { cop, pco, cop, pco, }, -- period/colon with RegEx popup block
+            { label = "বাংলা", " ", " ", " ", " ", width = 3.0, }, -- Spacebar
+            { label = "←", }, -- Arrow left
+            { label = "→", }, -- Arrow right
+            { label = "⮠", "\n","\n","\n","\n", width = 1.5, }, -- Enter
+        },
+    },
+}

frontend/ui/data/keyboardlayouts/keypopup/bn_popup.lua

@@ -0,0 +1,558 @@
+return {
+    com = {
+        ",",
+        north = ";",
+        alt_label = ";",
+        northeast = "(",
+        northwest = "¿",
+        east = "„",
+        west = "?",
+    },
+
+    prd = {
+        ".",
+        north = ":",
+        alt_label = ":",
+        northeast = ")",
+        northwest = "¡",
+        east = "…",
+        west = "!",
+    },
+    _at = {
+        "@",
+        north = "Ⓒ",
+        alt_label = "Ⓒ",
+        northeast = "™",
+        northwest = "Ⓡ",
+    },
+    _eq = {
+        "=",
+        north = "_",
+        alt_label = "_",
+        northwest = "-",
+        west = "≈",
+        south = "≥",
+        southwest = "≤",
+    },
+    pco = { -- period + colon
+        ".",
+        north = {
+            key = "‍",
+            label = "ZWJ",
+        },
+        alt_label = "ZWJ",
+        northeast = "'",
+        northwest = "=",
+        east = "!",
+        west = "?",
+        south = "|",
+        southeast = ":",
+        southwest = "/",
+        "\\",
+        '^',
+        "&",
+        "$",
+    },
+    cop = { -- colon + period
+        "‍",
+        label = "ZWJ",
+        north = ".",
+        alt_label = ".",
+        northeast = "'",
+        northwest = "=",
+        east = "!",
+        west = "?",
+        south = "|",
+        southeast = ":",
+        southwest = "/",
+        "\\",
+        '^',
+        "&",
+        "$",
+    },
+    quo = {
+        '"',
+        north = "'",
+        alt_label = "'",
+        northeast = "»",
+        northwest = "«",
+        east = "”",
+        west = "“",
+        south = "`",
+        southeast = "’",
+        southwest = "‘",
+        "‹",
+        "›",
+    },
+    cse = { -- comma + semicolon
+        ",",
+        north = ";",
+        alt_label = ";",
+        northeast = "}",
+        northwest = "{",
+        east = { label = "!…", key = "!important;" },
+        west = "-",
+        south = "*",
+        southwest = "0",
+        southeast = ">",
+        "[",
+        "+",
+        "]",
+    },
+    sec = { -- semicolon + comma
+        ";",
+        north = ",",
+        alt_label = ",",
+        northeast = "}",
+        northwest = "{",
+        east = { label = "!…", key = "!important;" },
+        west = "-",
+        south = "*",
+        southwest = "0",
+        southeast = ">",
+        "[",
+        "*",
+        "]",
+    },
+    _da_ = {
+        "দ",
+        north = "ধ",
+        alt_label = "ধ",
+    },
+    _dha_ = {
+        "ধ",
+        north = "দ",
+        alt_label = "দ",
+    },
+    _U_kaar_ = {
+        "ূ",
+        north = "ঊ",
+        alt_label = "ঊ",
+    },
+    _U_ = {
+        "ঊ",
+        north = "ূ",
+        alt_label = "ূ",
+    },
+    _I_kaar_ = {
+        "ী",
+        north = "ঈ",
+        alt_label = "ঈ",
+    },
+    _I_ = {
+        "ঈ",
+        north = "ী",
+        alt_label = "ী",
+
+    },
+    _ra_ = {
+        "র",
+        north = "ড়",
+        alt_label = "ড়",
+        northeast = "Ð",
+        northwest = "Ď",
+        east = "$", -- Dollar currency
+        west = "Đ",
+        south = "∂", -- partial derivative
+        southeast = "Δ", -- Greek delta
+    },
+    _rda_ = {
+        "ড়",
+        north = "র",
+        alt_label = "র",
+    },
+    _Ta_ = {
+        "ট",
+        north = "ঠ",
+        alt_label = "ঠ",
+    },
+    _Tha_ = {
+        "ঠ",
+        north = "ট",
+        alt_label = "ট",
+    },
+    _e_ = {
+        "এ",
+        north = "ঐ",
+        alt_label = "ঐ",
+    },
+    _oi_ = {
+        "ঐ",
+        north = "এ",
+        alt_label = "এ",
+    },
+    _u_kaar_ = {
+        "ু",
+        north = "উ",
+        alt_label = "উ",
+    },
+    _u_ = {
+        "উ",
+        north = "ু",
+        alt_label = "ু",
+    },
+    _i_kaar_ = {
+        "ি",
+        north = "ই",
+        alt_label = "ই",
+    },
+    _i_ = {
+        "ই",
+        north = "ি",
+        alt_label = "ি",
+    },
+    _o_ = {
+        "ও",
+        north = "ঔ",
+        alt_label = "ঔ",
+
+    },
+    _ou_ = {
+        "ঔ",
+        north = "ও",
+        alt_label = "ও",
+
+    },
+    _pa_ = {
+        "প",
+        north = "ফ",
+        alt_label = "ফ",
+    },
+    _pha_ = {
+        "ফ",
+        north = "প",
+        alt_label = "প",
+    },
+    _e_kaar_ = {
+        "ে",
+        north = "ৈ",
+        alt_label = "ৈ",
+    },
+    _oi_kaar_ = {
+        "ৈ",
+        north = "ে",
+        alt_label = "ে",
+    },
+    _o_kaar_ = {
+        "ো",
+        north = "ৌ",
+        alt_label = "ৌ",
+    },
+    _ou_kaar_ = {
+        "ৌ",
+        north = "ো",
+        alt_label = "ো",
+    },
+    _aa_kaar_ = {
+        "া",
+        north = "অ",
+        alt_label = "অ",
+    },
+    _a_ = {
+        "অ",
+        north = "া",
+        alt_label = "া",
+    },
+    _sa_ = {
+        "স",
+        north = "ষ",
+        alt_label = "ষ",
+
+    },
+    _sHa_ = {
+        "ষ",
+        north = "স",
+        alt_label = "স",
+
+    },
+    _Da_ = {
+        "ড",
+        north = "ঢ",
+        alt_label = "ঢ",
+    },
+    _Dha_ = {
+        "ঢ",
+        north = "ড",
+        alt_label = "ড",
+    },
+    _ta_ = {
+        "ত",
+        north = "থ",
+        alt_label = "থ",
+    },
+    _tha_ = {
+        "থ",
+        north = "ত",
+        alt_label = "ত",
+    },
+    _ga_ = {
+        "গ",
+        north = "ঘ",
+        alt_label = "ঘ",
+    },
+    _gha_ = {
+        "ঘ",
+        north = "গ",
+        alt_label = "গ",
+    },
+    _ha_ = {
+        "হ",
+        north = "ঃ",
+        alt_label = "ঃ",
+    },
+    _bisarga_ = {
+        "ঃ",
+        north = "হ",
+        alt_label = "হ",
+    },
+    _ja_ = {
+        "জ",
+        north = "ঝ",
+        alt_label = "ঝ",
+    },
+    _jha_ = {
+        "ঝ",
+        north = "জ",
+        alt_label = "জ",
+    },
+    _ka_ = {
+        "ক",
+        north = "খ",
+        alt_label = "খ",
+
+    },
+    _kha_ = {
+        "খ",
+        north = "ক",
+        alt_label = "ক",
+    },
+    _la_ = {
+        "ল",
+        north = "ং",
+        alt_label = "ং",
+    },
+    _anuswara_ = {
+        "ং",
+        north = "ল",
+        alt_label = "ল",
+
+    },
+    _jya_ = {
+        "য",
+        north = "য়",
+        alt_label = "য়",
+
+    },
+    _ya_ = {
+        "য়",
+        north = "য",
+        alt_label = "য",
+
+    },
+    _sha_ = {
+        "শ",
+        north = "ঢ়",
+        alt_label = "ঢ়",
+
+    },
+    _Rha_ = {
+        "ঢ়",
+        north = "শ",
+        alt_label = "শ",
+    },
+    _cha_ = {
+        "চ",
+        north = "ছ",
+        alt_label = "ছ",
+    },
+    _Cha_ = {
+        "ছ",
+        north = "চ",
+        alt_label = "চ",
+    },
+    _aa_ = {
+        "আ",
+        north = "ঋ",
+        alt_label = "ঋ",
+    },
+    _rwi_ = {
+        "ঋ",
+        north = "আ",
+        alt_label = "আ",
+    },
+    _ba_ = {
+        "ব",
+        north = "ভ",
+        alt_label = "ভ",
+    },
+    _bha_ = {
+        "ভ",
+        north = "ব",
+        alt_label = "ব",
+    },
+    _na_ = {
+        "ন",
+        north = "ণ",
+        alt_label = "ণ",
+
+    },
+    _Na_ = {
+        "ণ",
+        north = "ন",
+        alt_label = "ন",
+    },
+    _ma_ = {
+        "ম",
+        north = "ঙ",
+        alt_label = "ঙ",
+
+    },
+    _uma_ = {
+        "ঙ",
+        north = "ম",
+        alt_label = "ম",
+
+    },
+    _rwi_kaar_ = {
+        "ৃ",
+        north = ",",
+        alt_label = ","
+    },
+    _chandrabindu_ = {
+        "ঁ",
+        north = "।",
+        alt_label = "।",
+    },
+    --  Bengali Pancuations
+    com2 = {
+        ",",
+        north = "ৃ",
+        alt_label = "ৃ",
+    },
+    daari = {
+        "।",
+        north = "ঁ",
+        alt_label = "ঁ",
+    },
+    hashanto = {
+        "্",
+        north = "?",
+        alt_label = "?",
+
+    },
+    question2 = {
+        "?",
+        north = "্",
+        alt_label = "্",
+
+    },
+  -- _1_ and _1p: numeric key 1 and its popup sibling (they have north swipe ups of each other, the rest is the same)
+  -- _1n and _1s: numpad key 1 (layer 2), -- superscript key 1 (layer 2, shifted)
+  _1_ = { "১", north = "!", alt_label = "!", northeast = "¡", south = "'", southeast = "¿", east = "?", },
+  _1p = { "!", north = "১", alt_label = "১", northeast = "¡", south = "'", southeast = "¿", east = "?", },
+  _1n = { "১", north = "¹", northeast = "⅑", northwest = "⅐", east = "⅙", west = "¼", south = "₁", southwest = "½", southeast = "⅓", "⅕", "⅛", "⅒", },
+  _1s = { "¹", north = "১", northeast = "⅑", northwest = "⅐", east = "⅙", west = "¼", south = "₁", southwest = "½", southeast = "⅓", "⅕", "⅛", "⅒", },
+
+  _2_ = { "২", north = "@", alt_label = "@", northeast = "~", northwest = "http://", east = "-", west = "https://", south = '"', southeast = "…", southwest = "/", },
+  _2p = { "@", north = "২", alt_label = "২", northeast = "~", northwest = "http://", east = "-", west = "https://", south = '"', southeast = "…", southwest = "/", },
+  _2n = { "২", north = "²", northeast = "⅖", east = "½", south = "₂", southeast = "⅔", }, -- numpad 2
+  _2s = { "²", north = "২", northeast = "⅖", east = "½", south = "₂", southeast = "⅔", }, -- superscript 2
+
+  _3_ = { "৩", north = "#", alt_label = "#", northeast = "☑", northwest = "★", east = "☐", west = "•", south = "№", southeast = "☒", southwest = "☆", ":)", ":|", ":(", },
+  _3p = { "#", north = "৩", alt_label = "৩", northeast = "☑", northwest = "★", east = "☐", west = "•", south = "№", southeast = "☒", southwest = "☆", ":)", ":|", ":(", },
+  _3n = { "৩", north = "³", northwest = "¾", east = "⅓", west = "⅗", southwest = "⅜", south = "₃", }, -- numpad 3
+  _3s = { "³", north = "৩", northwest = "¾", east = "⅓", west = "⅗", southwest = "⅜", south = "₃", }, -- superscript 3
+
+  _4_ = { "৪", north = "৳", alt_label = "$", northeast = "₹", northwest = "¥",  east = "₽", west = "£", south = "€", southeast = "¢", southwest = "₪", "₹", "₿", "₺", },
+  _4p = { "৳", north = "৪", alt_label = "৪", northeast = "₹", northwest = "¥",  east = "₽", west = "£", south = "€", southeast = "¢", southwest = "₪", "₹", "₿", "₺", },
+  _4n = { "৪", north = "⁴", east = "¼", south = "₄", southeast = "⅘", }, -- numpad 4
+  _4s = { "⁴", north = "৪", east = "¼", south = "₄", southeast = "⅘", }, -- superscript 4
+
+  _5_ = { "৬", north = "%", alt_label = "%", northeast = "‱", northwest = "‰", east = "⅓", west = "¼", south = "½", southeast = "⅔", southwest = "¾", },
+  _5p = { "%", north = "৬", alt_label = "৫", northeast = "‱", northwest = "‰", east = "⅓", west = "¼", south = "½", southeast = "⅔", southwest = "¾", },
+  _5n = { "৫", north = "⁵", northeast = "⅚", east = "⅕", south = "₅", southeast = "⅝", }, -- numpad 5
+  _5s = { "⁵", north = "৫", northeast = "⅚", east = "⅕", south = "₅", southeast = "⅝", }, -- superscript 5
+
+  -- diacritics. Symbols in quotation marks might look weird, however they should work fine.
+  _6_ = {
+  "৬",
+  north = "^",
+  alt_label = "^",
+  northeast = { label = "◌́", key = "́", }, -- Combining Acute Accent
+  northwest = { label = "◌̀", key = "̀", }, -- Combinig Grave Accent
+  east = { label = "◌̂", key = "̂", }, -- Combining Circumflex Accent
+  west = { label = "◌̃", key = "̃", }, -- Combining Tilde
+  south = { label = "◌̧", key = "̧", }, -- Combining Cedilla
+  southeast = { label = "◌̈", key = "̈", }, -- Combining Diaeresis (Umlaut)
+  southwest = { label = "◌̇", key = "̇", }, -- Combining Dot Above
+  { label = "◌̄", key = "̄", }, -- Combining Macron
+  { label = "◌̌", key = "̌", }, -- Combining Caron
+  { label = "◌̨", key = "̨", }, -- Combining Ogonek
+  },
+  _6p = {
+  "^",
+  north = "৬",
+  alt_label = "৬",
+  northeast = { label = "◌́", key = "́", }, -- Combining Acute Accent
+  northwest = { label = "◌̀", key = "̀", }, -- Combinig Grave Accent
+  east = { label = "◌̂", key = "̂", }, -- Combining Circumflex Accent
+  west = { label = "◌̃", key = "̃", }, -- Combining Tilde
+  south = { label = "◌̧", key = "̧", }, -- Combining Cedilla
+  southeast = { label = "◌̈", key = "̈", }, -- Combining Diaeresis (Umlaut)
+  southwest = { label = "◌̇", key = "̇", }, -- Combining Dot Above
+  { label = "◌̄", key = "̄", }, -- Combining Macron
+  { label = "◌̌", key = "̌", }, -- Combining Caron
+  { label = "◌̨", key = "̨", }, -- Combining Ogonek
+  },
+  _6n = { "৬", north = "⁶", east = "⅙", south = "₆", }, -- numpad 6
+  _6s = { "⁶", north = "৬", east = "⅙", south = "₆", }, -- superscript 6
+
+  _7_ = { "৭", north = "ঞ", alt_label = "ঞ", northeast = "»", northwest = "«", east = "¶", west = "§", south = "¤", southeast = "⟩", southwest = "⟨", "†", "■", "‡", },
+  _7p = { "ঞ", north = "৭", alt_label = "৭", northeast = "»", northwest = "«", east = "¶", west = "§", south = "¤", southeast = "⟩", southwest = "⟨", "†", "■", "‡", },
+  _7n = { "৭", north = "⁷", east = "⅐", south = "₇", southeast = "⅞", }, -- numpad 7
+  _7s = { "⁷", north = "৭", east = "⅐", south = "₇", southeast = "⅞", }, -- superscript 7
+
+  _8_ = { "৮", north = "ৎ", alt_label = "ৎ", northeast = "=", northwest = "≠", east = "+", west = "-", south = "/", southeast = ">", southwest = "<", "≤", "≈", "≥", },
+  _8p = { "ৎ", north = "৮", alt_label = "৮", northeast = "=", northwest = "≠", east = "+", west = "-", south = "/", southeast = ">", southwest = "<", "≤", "≈", "≥", },
+  _8n = { "৮", north = "⁸", east = "⅛", south = "₈", }, -- numpad 8
+  _8s = { "⁸", north = "৮", east = "⅛", south = "₈", }, -- superscript 8
+
+  _9_ = { "৯", north = "(", alt_label = "(", northeast = "_", northwest = "“", east = "-", west = "{", south = "[", southeast = "—", southwest = "‘", },
+  _9p = { "(", north = "৯", alt_label = "৯", northeast = "_", northwest = "“", east = "-", west = "{", south = "[", southeast = "—", southwest = "‘", },
+  _9n = { "৯", north = "⁹", east = "⅑", south = "₉", }, -- numpad 9
+  _9s = { "⁹", north = "৯", east = "⅑", south = "₉", }, -- superscript 9
+
+
+  _0_ = { "০", north = ")", alt_label = ")", northwest = "”", west = "}", south = "]", southwest = "’", },
+  _0p = { ")", north = "০", alt_label = "০", northwest = "”", west = "}", south = "]", southwest = "’", },
+  _0n = { "০", north = "⁰", south = "₀", }, -- numpad 0
+  _0s = { "⁰", north = "০", south = "₀", }, -- superscript 0
+
+  sla = { "/", north = "÷", alt_label = "÷", northeast = "⅟", east = "⁄", }, -- numpad slash
+  sl2 = { "÷", north = "/", alt_label = "/", northeast = "⅟", east = "⁄", }, -- superscript slash
+
+  eql = { "=", north = "≠", alt_label = "≠", northwest = "≃",  west = "≡", south = "≈", southwest = "≉", }, -- equality
+  eq2 = { "≠", north = "=", alt_label = "=", northwest = "≃", west = "≡", south = "≈", southwest = "≉", },  -- popup sibling
+  ls1 = { "<", north = "≤", alt_label = "≤", south = "≪", }, -- "less than" sign
+  ls2 = { "≤", north = "<", alt_label = "<", south = "≪", }, -- (popup sibling)
+  mr1 = { ">", north = "≥", alt_label = "≥", south = "≫", }, -- "more than"
+  mr2 = { "≥", north = ">", alt_label = ">", south = "≫", }, -- (popup sibling)
+  pls = { "+", north = "±", alt_label = "±", }, -- plus sign
+  pl2 = { "±", north = "+", alt_label = "+", }, -- (popup sibling)
+  mns = { "-", north = "∓", alt_label = "∓", }, -- minus sign
+  mn2 = { "∓", north = "-", alt_label = "-", }, -- (popup sibling)
+  dsh = { "-", north = "—", alt_label = "—", south = "–", }, -- dashes
+  dgr = { "†", north = "‡", alt_label = "‡", }, -- dagger
+  tpg = { "¶", north = "§", alt_label = "§", northeast = "™", northwest = "℠", east = "¤", west = "•", south = "®", southeast = "🄯", southwest = "©", }, -- typography symbols
+  mth = { "∇", north = "∀",alt_label = "∀",  northeast = "∃", northwest = "∄", east = "∈", west = "∉", south = "∅", southeast = "∩", southwest = "∪", "⊆", "⊂", "⊄", }, -- math operations 1
+  mt2 = { "∞", north = "ℕ", alt_label = "ℕ", northeast = "ℤ", northwest = "ℚ", east = "𝔸", west = "ℝ", south = "𝕀", southeast = "ℂ", southwest = "𝕌", "⊇", "⊃", "⊅", }, -- math operations 2
+  int = { "∫", north = "∬", alt_label = "∬", northeast = "⨌", northwest = "∭", east = "∑", west = "∏", south = "∮", southeast = "∰", southwest = "∯", "⊕", "ℍ", "⊗", }, -- integrals
+  dif = { "∂", north = "√", alt_label = "√", northeast = "∴", east = "⇒", south = "⇔", southeast = "∵", }, -- math operations 3
+  df2 = { "…", north = "⟂", alt_label = "⟂", northeast = "∡", northwest = "∟", east = "∝", west = "ℓ", }, -- math operations 4
+  pdc = { "*", north = "⨯", alt_label = "⨯", south = "⋅", }, -- asterisk, cross-product and dot-prodcuts symbols
+  pd2 = { "⨯", north = "*", alt_label = "*", south = "⋅", },
+  bar = { "|", north = "¦", alt_label = "¦", }, -- bars like pipe and broken bar
+  prm = { "‰", north = "‱", alt_label = "‱", }, -- per mile types
+  hsh = { "#", north = "№", alt_label = "№", }, -- hash and "No." sign
+  hs2 = { "№", north = "#", alt_label = "#", },
+}

frontend/ui/elements/font_ui_fallbacks.lua

@@ -16,6 +16,7 @@ local hardcoded_fallbacks = {
     "Noto Sans CJK SC",
     "Noto Sans Arabic UI",
     "Noto Sans Devanagari UI",
+    "Noto Sans Bengali UI",
 }
 -- Add any user font after Noto Sans CJK SC in the menu
 local additional_fallback_insert_indice = 2 -- (indice in the above list)

frontend/ui/font.lua

@@ -109,9 +109,10 @@ local Font = {
         [2] = "NotoSansCJKsc-Regular.otf",
         [3] = "NotoSansArabicUI-Regular.ttf",
         [4] = "NotoSansDevanagariUI-Regular.ttf",
-        [5] = "nerdfonts/symbols.ttf",
-        [6] = "freefont/FreeSans.ttf",
-        [7] = "freefont/FreeSerif.ttf",
+        [5] = "NotoSansBengaliUI-Regular.ttf",
+        [6] = "nerdfonts/symbols.ttf",
+        [7] = "freefont/FreeSans.ttf",
+        [8] = "freefont/FreeSerif.ttf",
     },
     -- Additional fallback fonts are managed by frontend/ui/elements/font_ui_fallbacks.lua
     -- Add any after NotoSansCJKsc (because CJKsc has better symbols, and has 'locl' OTF

frontend/ui/language.lua

@@ -33,7 +33,7 @@ local Language = {
         vi_VN = "Viet Nam",
         ar_AA = "عربى",
         bg_BG = "български",
-        bn = "বাঙালি",
+        bn = "বাংলা",
         el = "Ελληνικά",
         fa = "فارسی",
         ja = "日本語",

frontend/ui/widget/virtualkeyboard.lua

@@ -745,6 +745,7 @@ local VirtualKeyboard = FocusManager:new{
     lang_to_keyboard_layout = {
         ar_AA = "ar_AA_keyboard",
         bg_BG = "bg_keyboard",
+        bn = "bn_keyboard",
         de = "de_keyboard",
         el = "el_keyboard",
         en = "en_keyboard",

spec/unit/document_spec.lua

@@ -78,6 +78,7 @@ describe("EPUB document module", function()
             "Noto Naskh Arabic",
             "Noto Sans",
             "Noto Sans Arabic UI",
+            "Noto Sans Bengali UI",
             "Noto Sans CJK SC",
             "Noto Sans Devanagari UI",
             "Noto Serif",