i3 - improved tiling WM

Allow min_width of a block in i3bar to be a string

Patch status: merged

Patch by András Mohari

Long description:

With this change, min_width can either be an integer (as usual), or a
string. In the latter case, the width of the text given by min_width
determines the minimum width of the block. This way one does not have to
figure out a minimum width by trial and error, only to do it again every
time the font is changed.

To apply this patch, use:
curl http://cr.i3wm.org/patch/58/raw.patch | git am

b/docs/i3bar-protocol

19 
@@ -140,6 +140,10 @@ min_width::
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 	will be padded to the left and/or the right side, according to the +align+
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 	key. This is useful when you want to prevent the whole status line to shift
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 	when value take more or less space between each iteration.
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+        The value can also be a string. In this case, the width of the text given
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+        by +min_width+ determines the minimum width of the block. This is useful
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+        when you want to set a sensible minimum width regardless of which font you
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+        are using, and at what particular size.
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 align::
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 	Align text on the +center+ (default), +right+ or +left+ of the block, when
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 	the minimum width of the latter, specified by the +min_width+ key, is not
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@@ -178,6 +182,17 @@ of the i3bar protocol.
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 }
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 ------------------------------------------
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+In the following example, the longest (widest) possible value of the block is
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+used to set the minimum width:
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+
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+------------------------------------------
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+{
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+ "full_text": "CPU 4%",
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+ "min_width": "CPU 100%",
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+ "align": "left"
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+}
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+------------------------------------------
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+
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 An example of a block which uses all possible entries follows:
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 *Example*:

b/i3bar/src/child.c

52 
@@ -147,6 +147,10 @@ static int stdin_string(void *context, const unsigned char *val, unsigned int le
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         } else {
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             ctx->block.align = ALIGN_CENTER;
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         }
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+    } else if (strcasecmp(ctx->last_map_key, "min_width") == 0) {
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+        i3String *text = i3string_from_utf8_with_length((const char *)val, len);
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+        ctx->block.min_width = (uint32_t)predict_text_width(text);
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+        i3string_free(text);
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     }
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     return 1;
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 }