Naw is a small glue wrapper around nim to do awk-style text processing with it.
nimble install naw
Launch it with naw '...nim code...' inputting data to stdin. The following example generates a markdown table from CSV.
echo 'foo,1
bar,2
fuz,3
buz,4' | naw -F, 'My Report
===========
{"":-<20} {"":-<20}
# for r in rows():
{r[0]:<20} {r[1]:>20}
# end
{"":-<20} {"":-<20}
# for r in rows():
{r[0]} {r[1]}
# end
'
yields
My Report
===========
-------------------- --------------------
foo 1
bar 2
fuz 3
buz 4
-------------------- --------------------
Complete Nim syntax is supported through the stdtmpl source code filter. Complete nim strformat syntax is supported for output.
Additional convenience syntax is added:
rows() Iterator to iterate through a CSV stdin, using the seperator
rows("filename") specified with -F
+ Unary plus-sign, synonymous for parseInt
~ Unary tilde, synonymous for parseFloat
naw requires the Nim compiler to work.
naw bolts strformat onto the stdtmpl language and adds some glue, resulting in a really concise templating language for text formatting form CSV data, which is exactly what awk's domain is.
If you don't mind creating a file to compile, you can get very similar results to naw with pure nim
#? stdtmpl(emit="stdout.write &")
# import strformat, streams, parsecsv
# var x: CsvParser
# open(x, newFileStream(stdin), "-", '\t')
My Report
=========
{"":-<20} {"":-<20}
# while x.readRow():
{x.row[0]:<20} {x.row[1]:>20}
# end
{"":-<20} {"":-<20}
naw just allows you to pass the code as a command line parameter, which is nice if you're familiar with awk, and auto-imports strformat, streams and parsecsv as well as adding some shorthand syntax of its own.
Naw is experimental but small enough to work reasonably well off the bat. Install a specific version for to avoid changes.
nimble install naw@0.1.0
naw is MIT-Licensed