Provided by: braillegraph_0.3-1_all
braillegraph - a simple histogram tool that produces text output
braillegraph <data series psql -At -c 'select ...' |braillegraph
braillegraph takes a single data series and plots them abusing the Braille range (U+2800..U+28FF). It is able to display two values per a horizontal character, thus a plain text mail can hold an X range up to ~150 data points. The vertical resolution is 4/character, thus a reasonable Y range is up to 80ish. By default, no scaling is done at all — one dot is exactly one data point horizontally, a value of 1 vertically. Input is given as one non-negative integer per line.
psql bugs -A -t -c " select count(case when arch='amd64 (x86_64)' then 1 else null end) *80/count(*) from (select arch, date_trunc('month', timestamp) as month from si) m group by month order by month "|braillegraph
-h, --horizontal Horizontal layout. The Y axis is left-to-right, X axis is top-to-bottom. -m, --max number Force the target range of the data. Normally, the histogram will be auto-sized based on the largest value in the input; this option sets the max to a fixed value. It will result either in empty space on the graph or in values over the limit being hard- capped. You typically want this option when comparing multiple histograms, or when continuously updating the display. -y, --y-scale number Scale the data so that the graph takes a given size (measured in dots) instead of varying on the data given. The size in characters is ¼ the dot size on a vertical graph, ½ on horizontal.
Versions of FreeFont older than end of 2016 make any Braille glyphs (both for legitimate uses and for brailleimg) totally unreadable at pixel sizes commonly found in computer displays — ie, anything but HiDPI and/or very large text sizes. Alas, this font is commonly configured as primary fallback in default setups shipped by distributions.
Adam Borowski <email@example.com> 2017-03-30 BRAILLEGRAPH(1)