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#[
move to std/asciitables.nim once stable, or to a fusion package
once compiler can depend on fusion
]#
type Cell* = object
text*: string
width*, row*, col*, ncols*, nrows*: int
iterator parseTableCells*(s: string, delim = '\t'): Cell =
## Iterates over all cells in a `delim`-delimited `s`, after a 1st
## pass that computes number of rows, columns, and width of each column.
var widths: seq[int]
var cell: Cell
template update() =
if widths.len<=cell.col:
widths.setLen cell.col+1
widths[cell.col] = cell.width
else:
widths[cell.col] = max(widths[cell.col], cell.width)
cell.width = 0
for a in s:
case a
of '\n':
update()
cell.col = 0
cell.row.inc
elif a == delim:
update()
cell.col.inc
else:
# todo: consider multi-width chars when porting to non-ascii implementation
cell.width.inc
if s.len > 0 and s[^1] != '\n':
update()
cell.ncols = widths.len
cell.nrows = cell.row + 1
cell.row = 0
cell.col = 0
cell.width = 0
template update2() =
cell.width = widths[cell.col]
yield cell
cell.text = ""
cell.width = 0
cell.col.inc
template finishRow() =
for col in cell.col..<cell.ncols:
cell.col = col
update2()
cell.col = 0
for a in s:
case a
of '\n':
finishRow()
cell.row.inc
elif a == delim:
update2()
else:
cell.width.inc
cell.text.add a
if s.len > 0 and s[^1] != '\n':
finishRow()
proc alignTable*(s: string, delim = '\t', fill = ' ', sep = " "): string =
## Formats a `delim`-delimited `s` representing a table; each cell is aligned
## to a width that's computed for each column; consecutive columns are
## delimited by `sep`, and alignment space is filled using `fill`.
## More customized formatting can be done by calling `parseTableCells` directly.
for cell in parseTableCells(s, delim):
result.add cell.text
for i in cell.text.len..<cell.width:
result.add fill
if cell.col < cell.ncols-1:
result.add sep
if cell.col == cell.ncols-1 and cell.row < cell.nrows - 1:
result.add '\n'
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