xmtop/docs/grid-fill.md

T is max height in row
S(T) is all widgets with height T
R(T) is all widgets with height < T
X is len(R) > 0 ? 1 : 0
C is len(S) + X
Make row
Make C columns
Place S
Recurse with R; place result

1 2 3 4 5
cpu/2............... mem/1. 6:procs/2..........
3:temp/1. 2:disk/2......... |..................
|........ |................ |..................
|........ power/2.......... |..................
net/2............... batt.. |..................

1 2 3 4 5
cpu/2............... 6:procs/2........ mem/1...
2:disk/2............ |................ 3:temp/1
|................... |................ |.......
power/2............. |................ |.......
net/2............... |................ batt

1 2 3 4 5
1x2................. 3x2.............. 1x1..... 221 221
2x2................. ||||||||||||||||| 3x1..... 21 2x1
|||||||||||||||||||| ||||||||||||||||| ||||||||
1x1...... 1x1...... 1x2.............. 1x1..... 1121
1x2................. 1x2.............. |||||||| 22 22x
1x1...... 1x4................................... 14

initial columns = initial row
fill
pattern for row
does pattern fit columns?
yes: place widgets
no: new row w/ new columns; fill

does fit
cw < patt_c_w