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"""Simple script to replace @DATE@ and friends with real information.
Usage: rewrite.py boilerplate.tex [VAR=value] ... <template >output
"""
import sys
import time
def get_info(fp):
s = fp.read()
d = {}
start = s.find(r"\date{")
if start >= 0:
end = s.find("}", start)
date = s[start+6:end]
if date == r"\today":
date = time.strftime("%B %d, %Y", time.localtime(time.time()))
d["DATE"] = date
return d
def main():
s = sys.stdin.read()
if "@" in s:
# yes, we actully need to load the replacement values
d = get_info(open(sys.argv[1]))
for arg in sys.argv[2:]:
name, value = arg.split("=", 1)
d[name] = value
start = 0
while 1:
start = s.find("@", start)
if start < 0:
break
end = s.find("@", start+1)
name = s[start+1:end]
if name:
value = d.get(name)
if value is None:
start = end + 1
else:
s = s[:start] + value + s[end+1:]
start = start + len(value)
else:
# "@@" --> "@"
s = s[:start] + s[end:]
start = end
sys.stdout.write(s)
if __name__ == "__main__":
main()
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