[core/output] allow specification of per-widget modified

make it possible to specify the minimum width of all widgets via:

`-m cpu -p cpu.theme.minwidth=20`

or

`-m cpu -p cpu.theme.minwidth=aaaaaa`

multiple widgets are comma-separated (missing entries will have no
minwidth)

`-m sensors2 -p sensors2.theme.minwidth=10,20,10`

see #606

TODO add to documentation

core/output.py

@@ -84,7 +84,7 @@ class block(object):
         for k in [
             'name', 'instance', 'separator_block_width', 'border', 'border_top',
             'border_bottom', 'border_left', 'border_right', 'markup',
-            '_raw', '_suffix', '_prefix'
+            '_raw', '_suffix', '_prefix', 'min_width'
         ]:
             assign(self.__attributes, result, k)
 
@@ -153,7 +153,12 @@ class i3(object):
 
     def __content_block(self, module, widget):
         blk = block(self.__theme, module, widget)
-        blk.set('min_width', widget.get('theme.minwidth'))
+        minwidth = widget.theme('minwidth')
+        if minwidth is not None:
+            try:
+                blk.set('min-width', '-'*int(minwidth))
+            except:
+                blk.set('min-width', minwidth)
         blk.set('full_text', self.__content[widget])
         if widget.get('pango', False):
             blk.set('markup', 'pango')

core/widget.py

@@ -1,6 +1,8 @@
 import core.input
 import core.decorators
+
 import util.store
+import util.format
 
 class Widget(util.store.Store, core.input.Object):
     def __init__(self, full_text='', name=None, module=None):
@@ -9,6 +11,24 @@ class Widget(util.store.Store, core.input.Object):
         self.module = module
         self.name = name
 
+    def index(self):
+        if not self.module: return 0
+
+        idx = 0
+        for w in self.module.widgets():
+            if w.id == self.id:
+                return idx
+            idx = idx + 1
+        return -1 # not found
+
+    def theme(self, attribute):
+        attr = 'theme.{}'.format(attribute)
+        if self.module:
+            param = util.format.aslist(self.module.parameter(attr))
+            if param and len(param) > self.index():
+                return param[self.index()]
+        return self.get(attr)
+
     def full_text(self, value=None):
         if value:
             self.__full_text = value