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## Segment of code that returns list of all necessary GDELT files to cover the time span specified
# Input start_date and end_date in the form "yyyy-mm-dd".
FileListFromDates <- function(start_date, end_date=start_date){
start_date <- as.Date(start_date)
end_date <- as.Date(end_date)
if(end_date < start_date) stop("end_date cannot be before start_date")
if(start_date < as.Date("1979-01-01")) stop("start_date cannot be before 1979")
if(end_date > Sys.Date()) stop("end_date cannot be in the future")
out <- character(0)
## PART A
## make the yyyy list for 1979 through 2005
if(start_date < "2006-01-01"){
start_year <- as.numeric(format(start_date, "%Y"))
end_year <- min(c(2005,as.numeric(format(end_date, "%Y"))))
out <- c(out, paste(start_year:end_year, ".zip", sep=""))
}
# PART B
# Make the yyyymm list for 2006 through March 2013
if(start_date < as.Date("2013-04-01") & end_date >= as.Date("2006-01-01")) {
if( start_date < as.Date("2006-01-01") ) {
b_start_date <- as.Date("2006-01-01")
} else {
b_start_date <- as.Date(paste(format(start_date, "%Y-%m-"), "01", sep=""))
}
if( end_date < as.Date("2013-04-01") ) {
b_end_date <- end_date
} else {
b_end_date <- as.Date("2013-03-31")
}
out <- c(out, paste(format(seq(from=b_start_date, to=b_end_date, by="month"), "%Y%m"),
".zip", sep=""))
}
# PART C
# Make list of yyyymmdd starting April 1, 2013
if( end_date >= as.Date("2013-04-01") ){
if( start_date < as.Date("2013-04-01") ) {
c_start_date <- as.Date("2013-04-01")
} else {
c_start_date <- start_date
}
out <- c(out, paste(format(seq(from=c_start_date, to=end_date, by="day"), "%Y%m%d"),
".export.CSV.zip", sep=""))
}
# Remove dates GDELT just doesn't have
out <- setdiff(out, c("20140123.export.CSV.zip","20140124.export.CSV.zip","20140125.export.CSV.zip"))
return( out )
}
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