Bar refactor

Nothing visible except more and less bugs, but it's waaaaay easier to
work with the code :)

config/lemonbar/bar.py

@@ -9,10 +9,6 @@ if __name__ == "__main__":
     Bar.init()
     Updater.init()
 
-#     Bar.addSectionAll(NotmuchUnreadProvider(dir='~/.mail/', theme=1), BarGroupType.RIGHT)
-#     Bar.addSectionAll(TimeProvider(theme=1), BarGroupType.RIGHT)
-# else:
-
     WORKSPACE_THEME = 0
     FOCUS_THEME = 3
     URGENT_THEME = 1
@@ -28,10 +24,10 @@ if __name__ == "__main__":
     SYSTEM_THEME = 2
     DANGER_THEME = FOCUS_THEME
     CRITICAL_THEME = URGENT_THEME
-    Bar.addSectionAll(CpuProvider(theme=SYSTEM_THEME, themeDanger=DANGER_THEME, themeCritical=CRITICAL_THEME), BarGroupType.RIGHT)
-    Bar.addSectionAll(RamProvider(theme=SYSTEM_THEME, themeDanger=DANGER_THEME, themeCritical=CRITICAL_THEME), BarGroupType.RIGHT)
-    Bar.addSectionAll(TemperatureProvider(theme=SYSTEM_THEME, themeDanger=DANGER_THEME, themeCritical=CRITICAL_THEME), BarGroupType.RIGHT)
-    Bar.addSectionAll(BatteryProvider(theme=SYSTEM_THEME, themeDanger=DANGER_THEME, themeCritical=CRITICAL_THEME), BarGroupType.RIGHT)
+    Bar.addSectionAll(CpuProvider(), BarGroupType.RIGHT)
+    Bar.addSectionAll(RamProvider(), BarGroupType.RIGHT)
+    Bar.addSectionAll(TemperatureProvider(), BarGroupType.RIGHT)
+    Bar.addSectionAll(BatteryProvider(), BarGroupType.RIGHT)
 
     # Peripherals
     PERIPHERAL_THEME = 5

config/lemonbar/display.py

@@ -17,7 +17,6 @@ log = logging.getLogger()
 # BarGroup strings should be a good compromise)
 # TODO Use bytes rather than strings
 # TODO Use default colors of lemonbar sometimes
-# TODO Mouse actions
 # TODO Adapt bar height with font height
 
 
@@ -144,7 +143,6 @@ class Bar:
         # Color for empty sections
         Bar.string += BarGroup.color(*Section.EMPTY)
 
-        # print(Bar.string)
         Bar.process.stdin.write(bytes(Bar.string + '\n', 'utf-8'))
         Bar.process.stdin.flush()
 
@@ -194,10 +192,6 @@ class BarGroup:
     def bgColor(color):
         return "%{B" + (color or '-') + "}"
 
-    @staticmethod
-    def underlineColor(color):
-        return "%{U" + (color or '-') + "}"
-
     @staticmethod
     def color(fg, bg):
         return BarGroup.fgColor(fg) + BarGroup.bgColor(bg)
@@ -291,6 +285,9 @@ class Section:
     THEMES = list()
     EMPTY = (FGCOLOR, BGCOLOR)
 
+    ICON = None
+    PERSISTENT = False
+
     #: Sections that do not have their destination size
     sizeChanging = set()
     updateThread = SectionThread(daemon=True)
@@ -321,14 +318,15 @@ class Section:
         self.curSize = 0
 
         #: Destination text
-        self.dstText = ''
+        self.dstText = Text(' ', Text(), ' ')
         #: Destination size
         self.dstSize = 0
 
         #: Groups that have this section
         self.parents = set()
 
-        self.actions = set()
+        self.icon = self.ICON
+
 
     def __str__(self):
         try:
@@ -355,92 +353,24 @@ class Section:
         for parent in self.parents:
             parent.childsTextChanged = True
 
-    def parseParts(self, parts, bit='', clo=''):
-        # TODO OPTI Shall benefit of a major refactor, using Objects rather
-        # than dicts and a stack-based approac
-        if isinstance(parts, str):
-            parts = [parts]
-
-        bits = []
-        clos = []
-        for part in parts:
-            if isinstance(part, str):
-                for char in part:
-                    bit += char
-                    bits.append(bit)
-                    clos.append(clo)
-                    bit = ''
-            elif isinstance(part, dict):
-                newBit = ''
-                newClo = ''
-                if 'fgColor' in part:
-                    newBit = newBit + BarGroup.fgColor(part['fgColor'])
-                    newClo = BarGroup.fgColor(Section.THEMES[self.theme][0]) + newClo
-                if 'bgColor' in part:
-                    newBit = newBit + BarGroup.bgColor(part['bgColor'])
-                    newClo = BarGroup.bgColor(Section.THEMES[self.theme][0]) + newClo
-                if 'underlineColor' in part:
-                    newBit = newBit + BarGroup.underlineColor(part['underlineColor'])
-                    newClo = BarGroup.underlineColor(None) + newClo
-                if 'underline' in part:
-                    newBit = newBit + '%{+u}'
-                    newClo = '%{-u}' + newClo
-                if 'overline' in part:
-                    newBit = newBit + '%{+o}'
-                    newClo = '%{-o}' + newClo
-                if 'mouseLeft' in part:
-                    handle = Bar.getFunctionHandle(part['mouseLeft'])
-                    newBit = newBit + '%{A1:' + handle.decode() + ':}'
-                    newClo = '%{A1}' + newClo
-                if 'mouseMiddle' in part:
-                    handle = Bar.getFunctionHandle(part['mouseMiddle'])
-                    newBit = newBit + '%{A2:' + handle.decode() + ':}'
-                    newClo = '%{A2}' + newClo
-                if 'mouseRight' in part:
-                    handle = Bar.getFunctionHandle(part['mouseRight'])
-                    newBit = newBit + '%{A3:' + handle.decode() + ':}'
-                    newClo = '%{A3}' + newClo
-                if 'mouseScrollUp' in part:
-                    handle = Bar.getFunctionHandle(part['mouseScrollUp'])
-                    newBit = newBit + '%{A4:' + handle.decode() + ':}'
-                    newClo = '%{A4}' + newClo
-                if 'mouseScrollDown' in part:
-                    handle = Bar.getFunctionHandle(part['mouseScrollDown'])
-                    newBit = newBit + '%{A5:' + handle.decode() + ':}'
-                    newClo = '%{A5}' + newClo
-                newBits, newClos = self.parseParts(part["cont"], bit=bit+newBit, clo=newClo+clo)
-                newBits[-1] += newClo # TODO Will sometimes display errors from lemonbar
-                bits += newBits
-                clos += newClos
-            else:
-                raise RuntimeError()
-
-        return bits, clos
-
     def updateText(self, text):
-        # TODO FEAT Actions
-        # TODO OPTI When srcSize == dstSize, maybe the bit array isn't
-        # needed
-        oldActions = self.actions.copy()
-
-        if len(text):
+        assert not isinstance(text, list) # Old behaviour, keep it until everything is cleaned
         if isinstance(text, str):
-                # TODO OPTI This common case
-                text = [text]
+            text = Text(text)
 
-            self.dstBits, self.dstClos = self.parseParts([' '] + text + [' '])
-            # TODO FEAT Half-spaces
+        if self.icon:
+            self.dstText[0] = ' ' + self.icon + ' '
 
-            self.dstText = ''.join(self.dstBits)
-            self.dstSize = len(self.dstBits)
+        if text is None:
+            self.dstSize = 3 if self.PERSISTENT else 0
         else:
-            self.dstSize = 0
-
-        for action in oldActions:
-            self.unregsiterAction(action)
+            self.dstText[1] = text
+            self.dstText.setSection(self)
+            self.dstSize = len(self.dstText)
 
         if self.curSize == self.dstSize:
-            self.curText = self.dstText
+            if self.dstSize > 0:
+                self.curText = str(self.dstText)
                 self.informParentsTextChanged()
         else:
             Section.sizeChanging.add(self)
@@ -449,6 +379,8 @@ class Section:
     def updateTheme(self, theme):
         assert isinstance(theme, int)
         assert theme < len(Section.THEMES)
+        if theme == self.theme:
+            return
         self.theme = theme
         self.informParentsThemeChanged()
         Section.somethingChanged.set()
@@ -482,9 +414,7 @@ class Section:
             Section.sizeChanging.remove(self)
             return
 
-        closPos = self.curSize-1
-        clos = self.dstClos[closPos] if closPos < len(self.dstClos) else ''
-        self.curText = ''.join(Section.fit(self.dstBits, self.curSize)) + clos
+        self.curText = self.dstText.text(size=self.curSize, pad=True)
         self.informParentsTextChanged()
 
     @staticmethod
@@ -512,13 +442,15 @@ class Section:
 
 class StatefulSection(Section):
     # TODO Allow to temporary expand the section (e.g. when important change)
-    NUMBER_STATES = 4
+    NUMBER_STATES = None
 
     def __init__(self, *args, **kwargs):
         Section.__init__(self, *args, **kwargs)
         self.state = 0
         if hasattr(self, 'onChangeState'):
             self.onChangeState(self.state)
+        self.dstText.setDecorators(scrollUp=self.incrementState,
+                                   scrollDown=self.decrementState)
 
     def incrementState(self):
         newState = min(self.state + 1, self.NUMBER_STATES - 1)
@@ -536,18 +468,9 @@ class StatefulSection(Section):
             self.onChangeState(state)
         self.refreshData()
 
-    def updateText(self, text):
-        if not len(text):
-            return text
-        Section.updateText(self, [{
-            "mouseScrollUp": self.incrementState,
-            "mouseScrollDown": self.decrementState,
-            "cont": text
-        }])
-
 class ColorCountsSection(StatefulSection):
     NUMBER_STATES = 3
-    ICON = '?'
+    COLORABLE_ICON = '?'
 
     def __init__(self, theme=None):
         StatefulSection.__init__(self, theme=theme)
@@ -556,59 +479,154 @@ class ColorCountsSection(StatefulSection):
         counts = self.subfetcher()
         # Nothing
         if not len(counts):
-            return ''
+            return None
         # Icon colored
         elif self.state == 0 and len(counts) == 1:
             count, color = counts[0]
-            return [{'fgColor': color, "cont": self.ICON}]
+            return Text(self.COLORABLE_ICON, fg=color)
         # Icon
         elif self.state == 0 and len(counts) > 1:
-            return self.ICON
+            return Text(self.COLORABLE_ICON)
         # Icon + Total
         elif self.state == 1 and len(counts) > 1:
             total = sum([count for count, color in counts])
-            return [self.ICON, ' ', str(total)]
+            return Text(self.COLORABLE_ICON, ' ', total)
         # Icon + Counts
         else:
-            text = [self.ICON]
+            text = Text(self.COLORABLE_ICON)
             for count, color in counts:
-                text += [' ', {'fgColor': color, "cont": str(count)}]
+                text.append(' ', Text(count, fg=color))
             return text
 
 
-if __name__ == '__main__':
-    Bar.init()
-    sec = Section(0)
-    sech = Section(1)
-    sec1 = Section(2)
-    sec2 = Section(3)
-    sec2h = Section(4)
-    sec3 = Section(5)
-    Bar.addSectionAll(sec, BarGroupType.LEFT)
-    Bar.addSectionAll(sech, BarGroupType.LEFT)
-    Bar.addSectionAll(sec1, BarGroupType.LEFT)
-    Bar.addSectionAll(sec2, BarGroupType.RIGHT)
-    Bar.addSectionAll(sec2h, BarGroupType.RIGHT)
-    Bar.addSectionAll(sec3, BarGroupType.RIGHT)
+class Text:
+    def _setElements(self, elements):
+        # TODO OPTI Concatenate consecutrive string
+        self.elements = list(elements)
 
-    time.sleep(1)
-    sec.updateText("A")
-    time.sleep(1)
-    sec.updateText("")
-    time.sleep(1)
-    sec.updateText("Hello")
-    sec1.updateText("world!")
-    sec2.updateText("Salut")
-    sec2h.updateText("le")
-    sec3.updateText("monde !")
-    time.sleep(3)
-    sech.updateText("the")
-    sec2h.updateText("")
-    time.sleep(2)
-    sec.updateText("")
-    sech.updateText("")
-    sec1.updateText("")
-    sec2.updateText("")
-    sec2h.updateText("")
-    sec3.updateText("")
-    time.sleep(5)
+    def _setDecorators(self, decorators):
+        # TODO OPTI Convert no decorator to strings
+        self.decorators = decorators
+        self.prefix = None
+        self.suffix = None
+
+    def __init__(self, *args, **kwargs):
+        self._setElements(args)
+        self._setDecorators(kwargs)
+        self.section = None
+
+    def append(self, *args):
+        self._setElements(self.elements + list(args))
+
+    def prepend(self, *args):
+        self._setElements(list(args) + self.elements)
+
+    def setElements(self, *args):
+        self._setElements(args)
+
+    def setDecorators(self, **kwargs):
+        self._setDecorators(kwargs)
+
+    def setSection(self, section):
+        assert isinstance(section, Section)
+        self.section = section
+        for element in self.elements:
+            if isinstance(element, Text):
+                element.setSection(section)
+
+    def _genFixs(self):
+        if self.prefix is not None and self.suffix is not None:
+            return
+
+        self.prefix = ''
+        self.suffix = ''
+
+        def nest(prefix, suffix):
+            self.prefix = self.prefix + '%{' + prefix + '}'
+            self.suffix = '%{' + suffix + '}' + self.suffix
+
+        def getColor(val):
+            # TODO Allow themes
+            assert isinstance(val, str) and len(val) == 7
+            return val
+
+        def button(number, function):
+            handle = Bar.getFunctionHandle(function)
+            nest('A' + number + ':' + handle.decode() + ':', 'A' + number)
+
+        for key, val in self.decorators.items():
+            if key == 'fg':
+                reset = self.section.THEMES[self.section.theme][0]
+                nest('F' + getColor(val), 'F' + reset)
+            elif key == 'bg':
+                reset = self.section.THEMES[self.section.theme][1]
+                nest('B' + getColor(val), 'B' + reset)
+            elif key == "clickLeft":
+                button('1', val)
+            elif key == "clickMiddle":
+                button('2', val)
+            elif key == "clickRight":
+                button('3', val)
+            elif key == "scrollUp":
+                button('4', val)
+            elif key == "scrollDown":
+                button('5', val)
+            else:
+                log.warn("Unkown decorator: {}".format(key))
+
+    def _text(self, size=None, pad=False):
+        self._genFixs()
+        curString = self.prefix
+        curSize = 0
+        remSize = size
+
+        for element in self.elements:
+            if element is None:
+                continue
+            elif isinstance(element, Text):
+                newString, newSize = element._text(size=remSize)
+            else:
+                newString = str(element)
+                if remSize is not None:
+                    newString = newString[:remSize]
+                newSize = len(newString)
+
+            curString += newString
+            curSize += newSize
+
+            if remSize is not None:
+                remSize -= newSize
+                if remSize <= 0:
+                    break
+
+        curString += self.suffix
+
+        if pad and remSize > 0:
+            curString += ' ' * remSize
+            curSize += remSize
+
+        if size is not None:
+            if pad:
+                assert size == curSize
+            else:
+                assert size >= curSize
+        return curString, curSize
+
+    def text(self, *args, **kwargs):
+        string, size = self._text(*args, **kwargs)
+        return string
+
+    def __str__(self):
+        # TODO OPTI
+        return self.text()
+
+    def __len__(self):
+        # TODO OPTI
+        string, size = self._text()
+        return size
+
+    def __getitem__(self, index):
+        return self.elements[index]
+
+    def __setitem__(self, index, data):
+        self.elements[index] = data

config/lemonbar/providers.py

@@ -53,25 +53,60 @@ class TimeProvider(StatefulSection, PeriodicUpdater):
         StatefulSection.__init__(self, theme)
         self.changeInterval(1) # TODO OPTI When state < 1
 
-class CpuProvider(Section, PeriodicUpdater):
+class AlertLevel(enum.Enum):
+    NORMAL = 0
+    WARNING = 1
+    DANGER = 2
+
+class AlertingSection(StatefulSection):
+    # TODO EASE Correct settings for themes
+    THEMES = {AlertLevel.NORMAL: 2,
+              AlertLevel.WARNING: 3,
+              AlertLevel.DANGER: 1}
+    PERSISTENT = True
+
+    def getLevel(self, quantity):
+        if quantity > self.dangerThresold:
+            return AlertLevel.DANGER
+        elif quantity > self.warningThresold:
+            return AlertLevel.WARNING
+        else:
+            return AlertLevel.NORMAL
+
+    def updateLevel(self, quantity):
+        self.level = self.getLevel(quantity)
+        self.updateTheme(self.THEMES[self.level])
+        if self.level == AlertLevel.NORMAL:
+            return
+        # TODO Temporary update state
+
+    def __init__(self, theme):
+        StatefulSection.__init__(self, theme)
+        self.dangerThresold = 0.90
+        self.warningThresold = 0.75
+
+
+class CpuProvider(AlertingSection, PeriodicUpdater):
+    NUMBER_STATES = 3
+    ICON = ''
+
     def fetcher(self):
-        percents = psutil.cpu_percent(percpu=True)
         percent = psutil.cpu_percent(percpu=False)
-        theme = self.themeCritical if percent >= 90 else \
-            (self.themeDanger if percent >= 75 else self.themeNormal)
-        self.updateTheme(theme)
-        return ' ' + ''.join([Section.ramp(p/100) for p in percents])
+        self.updateLevel(percent/100)
+        if self.state >= 2:
+            percents = psutil.cpu_percent(percpu=True)
+            return ''.join([Section.ramp(p/100) for p in percents])
+        elif self.state >= 1:
+            return Section.ramp(percent/100)
 
     def __init__(self, theme=None, themeDanger=None, themeCritical=None):
+        AlertingSection.__init__(self, theme)
         PeriodicUpdater.__init__(self)
-        Section.__init__(self, theme)
-        self.themeNormal = theme or self.theme
-        self.themeDanger = themeDanger or self.theme
-        self.themeCritical = themeCritical or self.theme
         self.changeInterval(1)
 
 
 class RamProvider(Section, PeriodicUpdater):
+    # TODO Use AlertingSection
     """
     Shows free RAM
     """
@@ -93,7 +128,7 @@ class RamProvider(Section, PeriodicUpdater):
         self.changeInterval(1)
 
 class TemperatureProvider(Section, PeriodicUpdater):
-    # TODO FEAT Change color when > high > critical
+    # TODO Use AlertingSection
 
     RAMP = ""
 
@@ -124,7 +159,7 @@ class TemperatureProvider(Section, PeriodicUpdater):
 
 
 class BatteryProvider(Section, PeriodicUpdater):
-    # TODO Change color when < thresold%
+    # TODO Use AlertingSection
 
     RAMP = ""
 
@@ -194,24 +229,23 @@ class NetworkProviderSection(StatefulSection, Updater):
 
     NUMBER_STATES = 4
 
-    def getIcon(self):
+    def actType(self):
+        self.ssid = None
         if self.iface.startswith('eth') or self.iface.startswith('enp'):
             if 'u' in self.iface:
-                return ['']
+                self.icon = ''
             else:
-                return ['']
+                self.icon = ''
         elif self.iface.startswith('wlan') or self.iface.startswith('wlp'):
-            if self.state > 0:
+            self.icon = ''
+            if self.showSsid:
                 cmd = ["iwgetid", self.iface, "--raw"]
                 p = subprocess.run(cmd, stdout=subprocess.PIPE)
-                ssid = p.stdout.strip().decode()
-                return [' {}'.format(ssid)]
-            else:
-                return ['']
+                self.ssid = p.stdout.strip().decode()
         elif self.iface.startswith('tun') or self.iface.startswith('tap'):
-            return ['']
+            self.icon = ''
         else:
-            return ['?']
+            self.icon = '?'
 
     def getAddresses(self):
         ipv4 = None
@@ -224,26 +258,28 @@ class NetworkProviderSection(StatefulSection, Updater):
         return ipv4, ipv6
 
     def fetcher(self):
-        text = []
-
         if self.iface not in self.parent.stats or \
                 not self.parent.stats[self.iface].isup or \
                 self.iface.startswith('lo'):
-            return text
+            return None
 
         # Get addresses
         ipv4, ipv6 = self.getAddresses()
         if ipv4 is None and ipv6 is None:
-            return text
+            return None
 
-        text = self.getIcon()
+        text = []
+        self.actType()
+
+        if self.showSsid and self.ssid:
+            text.append(self.ssid)
 
         if self.showAddress:
             if ipv4:
                 netStrFull = '{}/{}'.format(ipv4.address, ipv4.netmask)
                 addr = ipaddress.IPv4Network(netStrFull, strict=False)
                 addrStr = '{}/{}'.format(ipv4.address, addr.prefixlen)
-                text += [addrStr]
+                text.append(addrStr)
             # TODO IPV6
             # if ipv6:
             #     text += ' ' + ipv6.address
@@ -255,16 +291,18 @@ class NetworkProviderSection(StatefulSection, Updater):
                 - self.parent.prevIO[self.iface].bytes_sent
             recvDiff /= self.parent.dt
             sentDiff /= self.parent.dt
-            text += [' ↓{}↑{}'.format(humanSize(recvDiff), humanSize(sentDiff))]
+            text.append('↓{}↑{}'.format(humanSize(recvDiff),
+                                         humanSize(sentDiff)))
 
         if self.showTransfer:
-            text += [' ⇓{}⇑{}'.format(
+            text.append('⇓{}⇑{}'.format(
                 humanSize(self.parent.IO[self.iface].bytes_recv),
-                humanSize(self.parent.IO[self.iface].bytes_sent))]
+                humanSize(self.parent.IO[self.iface].bytes_sent)))
 
-        return text
+        return ' '.join(text)
 
     def onChangeState(self, state):
+        self.showSsid = state >= 0
         self.showAddress = state >= 1
         self.showSpeed = state >= 2
         self.showTransfer = state >= 3
@@ -307,7 +345,7 @@ class NetworkProvider(Section, PeriodicUpdater):
         for section in self.sections.values():
             section.refreshData()
 
-        return ''
+        return None
 
     def addParent(self, parent):
         self.parents.add(parent)
@@ -328,15 +366,13 @@ class SshAgentProvider(PeriodicUpdater):
         cmd = ["ssh-add", "-l"]
         proc = subprocess.run(cmd, stdout=subprocess.PIPE, stderr=subprocess.DEVNULL)
         if proc.returncode != 0:
-            return ''
-        text = []
+            return None
+        text = Text()
         for line in proc.stdout.split(b'\n'):
             if not len(line):
                 continue
             fingerprint = line.split()[1]
-            text += [{"cont": '',
-                      "fgColor": randomColor(seed=fingerprint)
-                      }]
+            text.append(Text('', fg=randomColor(seed=fingerprint)))
         return text
 
     def __init__(self):
@@ -349,8 +385,8 @@ class GpgAgentProvider(PeriodicUpdater):
         proc = subprocess.run(cmd, stdout=subprocess.PIPE, stderr=subprocess.DEVNULL)
         # proc = subprocess.run(cmd)
         if proc.returncode != 0:
-            return ''
-        text = []
+            return None
+        text = Text()
         for line in proc.stdout.split(b'\n'):
             if not len(line) or line == b'OK':
                 continue
@@ -358,9 +394,7 @@ class GpgAgentProvider(PeriodicUpdater):
             if spli[6] != b'1':
                 continue
             keygrip = spli[2]
-            text += [{"cont": '',
-                      "fgColor": randomColor(seed=keygrip)
-                      }]
+            text.append(Text('', fg=randomColor(seed=keygrip)))
         return text
 
     def __init__(self):
@@ -368,14 +402,16 @@ class GpgAgentProvider(PeriodicUpdater):
         self.changeInterval(5)
 
 class KeystoreProvider(Section, MergedUpdater):
+    ICON = ''
+
     def __init__(self, theme=None):
-        MergedUpdater.__init__(self, SshAgentProvider(), GpgAgentProvider(), prefix=[' '])
+        MergedUpdater.__init__(self, SshAgentProvider(), GpgAgentProvider())
         Section.__init__(self, theme)
 
 class NotmuchUnreadProvider(ColorCountsSection, PeriodicUpdater):
     # TODO OPTI Transform InotifyUpdater (watching notmuch folder should be
     # enough)
-    ICON = ''
+    COLORABLE_ICON = ''
 
     def subfetcher(self):
         db = notmuch.Database(mode=notmuch.Database.MODE.READ_ONLY, path=self.dir)
@@ -414,7 +450,7 @@ class NotmuchUnreadProvider(ColorCountsSection, PeriodicUpdater):
 class TodoProvider(ColorCountsSection, InotifyUpdater):
     # TODO OPT/UX Maybe we could get more data from the todoman python module
     # TODO OPT Specific callback for specific directory
-    ICON = ''
+    COLORABLE_ICON = ''
 
     def updateCalendarList(self):
         calendars = sorted(os.listdir(self.dir))
@@ -575,6 +611,7 @@ class I3WorkspacesProvider(Section, I3Updater):
         self.initialPopulation(parent)
 
 class MpdProvider(Section, ThreadedUpdater):
+    # TODO FEAT More informations and controls
 
     MAX_LENGTH = 50
 
@@ -610,9 +647,7 @@ class MpdProvider(Section, ThreadedUpdater):
         if len(infosStr) > MpdProvider.MAX_LENGTH:
             infosStr = infosStr[:MpdProvider.MAX_LENGTH-1] + '…'
 
-        text = [" {}".format(infosStr)]
-
-        return text
+        return " {}".format(infosStr)
 
     def loop(self):
         try:
@@ -624,3 +659,4 @@ class MpdProvider(Section, ThreadedUpdater):
         except BaseException as e:
             log.error(e, exc_info=True)
 
+

config/lemonbar/updaters.py

@@ -9,6 +9,7 @@ import time
 import logging
 import coloredlogs
 import i3ipc
+from display import Text
 
 coloredlogs.install(level='DEBUG', fmt='%(levelname)s %(message)s')
 log = logging.getLogger()
@@ -231,23 +232,17 @@ class MergedUpdater(Updater):
 
     # TODO OPTI Do not update until end of periodic batch
     def fetcher(self):
-        text = []
+        text = Text()
         for updater in self.updaters:
-            data = self.texts[updater]
-            if not len(data):
-                continue
-            if isinstance(data, str):
-                data = [data]
-            text += data
-        if not len(text):
-            return ''
-        return self.prefix + text + self.suffix
+            text.append(self.texts[updater])
+        # TODO OPTI After Text.__len__
+        # if not len(text):
+        #     return None
+        return text
 
-    def __init__(self, *args, prefix=[''], suffix=['']):
+    def __init__(self, *args):
         Updater.__init__(self)
 
-        self.prefix = prefix
-        self.suffix = suffix
         self.updaters = []
         self.texts = dict()