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tm_expiring_contracts.R
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tm_expiring_contracts.R
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#' Get expiring contracts
#'
#' Returns a data frame of players with expiring contracts for a selected league and time period
#'
#' @param country_name the country of the league's players
#' @param contract_end_year the year the contract is due to expire
#' @param league_url league url from transfermarkt.com. To be used when country_name not available in main function
#'
#' @return returns a dataframe of expiring contracts in the selected league
#'
#' @importFrom magrittr %>%
#' @importFrom rlang .data
#' @importFrom utils read.csv
#'
#' @export
#'
tm_expiring_contracts <- function(country_name, contract_end_year, league_url = NA) {
main_url <- "https://www.transfermarkt.com"
if(is.na(league_url)) {
meta_df <- read.csv(url("https://raw.githubusercontent.com/JaseZiv/worldfootballR_data/master/raw-data/transfermarkt_leagues/main_comp_seasons.csv"),
stringsAsFactors = F)
tryCatch({meta_df_seasons <- meta_df %>%
dplyr::filter(.data[["country"]] %in% country_name)}, error = function(e) {meta_df_seasons <- data.frame()})
if(nrow(meta_df_seasons) == 0) {
stop(glue::glue("Country {country_name} not found. Check that the country and season exists at https://github.com/JaseZiv/worldfootballR_data/blob/master/raw-data/transfermarkt_leagues/main_comp_seasons.csv"))
}
comp_url <- meta_df_seasons$comp_url %>% unique() %>% .[1]
} else {
tryCatch({league_page <- .load_page(league_url)}, error = function(e) {league_page <- c()})
tryCatch({country <- league_page %>%
rvest::html_nodes(".data-header") %>%
rvest::html_node("img") %>%
rvest::html_attr("alt") %>% .[!is.na(.)] %>% stringr::str_squish()}, error = function(e) {country_name <- NA_character_})
tryCatch({comp_name <- league_page %>% rvest::html_nodes(".data-header__headline-wrapper--oswald") %>% rvest::html_text() %>% stringr::str_squish()},
error = function(e) {country_name <- comp_name})
comp_url <- league_url
if(length(league_page) == 0) {
stop(glue::glue("League URL(s) {league_url} not found. Please check transfermarkt.com for the correct league URL"))
}
}
comp_url <- gsub("startseite", "endendevertraege", comp_url)
comp_url <- paste0(comp_url, "/plus/1/galerie/0?jahr=", contract_end_year, "&ausrichtung=alle&spielerposition_id=alle&altersklasse=alle&land_id=0&yt0=Show")
expiring_page <- xml2::read_html(comp_url)
expiring_urls <- expiring_page %>% rvest::html_nodes(".tm-pagination__list-item a") %>% rvest::html_attr("href")
if(length(expiring_urls)==0) {
expiring_pages <- comp_url
} else {
expiring_pages <- expiring_urls %>%
paste0(main_url, .) %>% unique()
}
get_each_page <- function(page_url) {
if(length(expiring_pages) == 0) {
exp_pg <- tryCatch(expiring_page %>% rvest::html_nodes("#yw1") %>% rvest::html_nodes("tbody") %>% .[[1]] %>% rvest::html_children(),
error = function(e) exp_pg <- NA_character_)
} else {
exp_pg <- xml2::read_html(page_url) %>% rvest::html_nodes("#yw1") %>% rvest::html_nodes("tbody") %>% .[[1]] %>% rvest::html_children()
}
# exp_pg <- xml2::read_html(page_url) %>% rvest::html_nodes("#yw1") %>% rvest::html_nodes("tbody") %>% .[[1]] %>% rvest::html_children()
player_name <- tryCatch(exp_pg %>% rvest::html_nodes(".inline-table .hauptlink a") %>% rvest::html_text(),
error = function(e) player_name <- NA_character_)
player_url <- tryCatch(exp_pg %>% rvest::html_nodes(".inline-table .hauptlink a") %>% rvest::html_attr("href") %>% paste0(main_url, .),
error = function(e) player_url <- NA_character_)
position <- tryCatch(exp_pg %>% rvest::html_nodes(".inline-table tr+ tr td") %>% rvest::html_text(),
error = function(e) position <- NA_character_)
nationality <- tryCatch(exp_pg %>% rvest::html_nodes(".flaggenrahmen:nth-child(1)") %>% rvest::html_attr("title"),
error = function(e) nationality <- NA_character_)
second_nationality <- c()
for(i in exp_pg) {
nat <- tryCatch(i %>% rvest::html_nodes("br+ .flaggenrahmen") %>% rvest::html_attr("title") %>% .replace_empty_na(),
error = function(e) nat <- NA_character_)
second_nationality <- tryCatch(c(second_nationality, nat),
error = function(e) second_nationality <- NA_character_)
}
current_club <- tryCatch(exp_pg %>% rvest::html_nodes(".tiny_wappen") %>% rvest::html_attr("alt"),
error = function(e) current_club <- NA_character_)
contract_expiry <- tryCatch(exp_pg %>% rvest::html_nodes(".no-border-rechts+ .zentriert") %>% rvest::html_text() %>% .tm_fix_dates(),
error = function(e) contract_expiry <- NA_character_)
contract_option <- tryCatch(exp_pg %>% rvest::html_nodes(".no-border-rechts~ .zentriert+ .zentriert") %>% rvest::html_text(),
error = function(e) contract_option <- NA_character_)
player_market_value <- tryCatch(exp_pg %>% rvest::html_nodes(".zentriert+ .hauptlink") %>% rvest::html_text(),
error = function(e) player_market_value <- NA_character_)
transfer_fee <- tryCatch(exp_pg %>% rvest::html_nodes(".hauptlink+ .rechts") %>% rvest::html_text(),
error = function(e) transfer_fee <- NA_character_)
agent <- tryCatch(exp_pg %>% rvest::html_nodes(".rechts+ .hauptlink") %>% rvest::html_text() %>% stringr::str_squish(),
error = function(e) agent <- NA_character_)
out_df <- cbind(player_name, player_url, position, nationality, second_nationality,
current_club, contract_expiry, contract_option, player_market_value, transfer_fee, agent) %>% data.frame()
if(is.na(league_url)) {
out_df <- meta_df_seasons %>% dplyr::select(.data[["comp_name"]], .data[["country"]], .data[["comp_url"]]) %>% dplyr::distinct() %>%
cbind(out_df)
} else {
out_df <- cbind(comp_name, country, comp_url, out_df)
}
out_df <- out_df %>%
dplyr::mutate(player_name = as.character(.data[["player_name"]]),
player_url = as.character(.data[["player_url"]]),
position = as.character(.data[["position"]]),
nationality = as.character(.data[["nationality"]]),
second_nationality = as.character(.data[["second_nationality"]]),
current_club = as.character(.data[["current_club"]]),
contract_expiry = lubridate::ymd(.data[["contract_expiry"]]),
contract_option = as.character(.data[["contract_option"]]),
player_market_value = mapply(.convert_value_to_numeric, .data[["player_market_value"]]),
transfer_fee = mapply(.convert_value_to_numeric, .data[["transfer_fee"]]),
agent = as.character(.data[["agent"]]))
return(out_df)
}
f_possibly <- purrr::possibly(get_each_page, otherwise = data.frame(), quiet = FALSE)
purrr::map_dfr(
expiring_pages,
f_possibly
)
}