lib/utils.nim
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import
base64,
os,
strutils,
sequtils,
pegs,
times
import
consts
proc parse_date*(date: string, timeinfo: var TimeInfo): bool =
var parts = date.split('-').map(proc(i:string): int =
try:
i.parseInt
except:
0
)
if parts.len < 3:
return false
try:
timeinfo = TimeInfo(year: parts[0], month: Month(parts[1]-1), monthday: parts[2])
# Fix invalid dates (e.g. Feb 31st -> Mar 3rd)
timeinfo = getLocalTime(timeinfo.toTime);
return true
except:
return false
proc style_tag*(css: string): string =
result = "<style>$1</style>" % [css]
proc encode_image*(contents, format: string): string =
let enc_contents = contents.encode(contents.len*3)
return "data:image/$format;base64,$enc_contents" % ["format", format, "enc_contents", enc_contents]
proc encode_image_file*(file, format: string): string =
if (file.existsFile):
let contents = file.readFile
return encode_image(contents, format)
else:
stderr.writeLine("Warning: image '" & file & "' not found.")
return file
proc image_format*(imgfile: string): string =
let peg_imgformat = peg"i'.png' / i'.jpg' / i'.jpeg' / i'.gif' / i'.svg' / i'.bmp' / i'.webp' @$"
return imgfile.substr(imgfile.find(peg_imgformat)+1, imgfile.len-1)
proc watermark_css*(imgfile: string): string =
if imgfile.isNil:
result = ""
else:
let img = imgfile.encode_image_file(imgfile.image_format)
result = (watermark_style % [img]).style_tag
proc encode_font*(font, format: string): string =
let enc_contents = font.encode(font.len*3)
return "data:application/$format;charset=utf-8;base64,$enc_contents" % ["format", format, "enc_contents", enc_contents]
proc create_font_face*(font, family, style: string, weight: int): string=
return """
@font-face {
font-family:"$family";
src:url($font) format('woff');
font-style:$style;
font-weight:$weight;
-webkit-font-smoothing: antialiased;
-moz-osx-font-smoothing: grayscale;
}
""" % ["family", family, "font", encode_font(font, "x-font-woff"), "style", style, "weight", $weight]
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