R/MSCI_min_vol.R

In nnguyen2496/mscir: Display MSCI USA and MSCI Min Volatility Data

getPath_min_vol <- function(){
  source_link <- "https://www.ishares.com/us/products/239695/ishares-msci-usa-minimum-volatility-etf/1467271812596.ajax?fileType=csv&fileName=USMV_holdings&dataType=fund"
  url <- getwd()
  path <- paste(url, "temp2.csv", sep = "/")
  result = c(source_link, path)
  return(result);
}

# download_file_min_vol()
#
# Download the dataset from https://www.ishares.com
download_file_min_vol <- function(){
  src <- getPath_min_vol();
  message(src[2])
  download.file(src[1], destfile = src[2])
}

# printTable_min_vol()
#
# Print out the table of MSCI min volatility constituents for a specific date
printTable_min_vol <- function(){
  src <- getPath_min_vol();
  if (!file.exists(src[2])) message("You need to download the dataset (run download_file_min_vol)")
  else {
    all_content <- readLines(src[2])
    skip_ten = all_content[-c(1:10)]
    data2 = read.csv(textConnection(skip_ten), header = TRUE, stringsAsFactors = FALSE)
  }
}

# printDate_min_vol()
#
# Print out the date when the MSCI min_vol data printed out
# by printTable_min_vol() was updated

printDate_min_vol <- function(){
  src <- getPath_min_vol();
  all_content <- readLines(src[2])
  date1= all_content[c(3)]
  date = gsub(".*,","",date1)
  message(date)
}