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/// Truncate a path to only have a set number of path components
///
/// Will truncate a path to only show the last `length` components in a path.
/// If a length of `0` is provided, the path will not be truncated.
pub fn truncate(dir_string: String, length: usize) -> String {
if length == 0 {
return dir_string;
}
let mut components = dir_string.split('/').collect::<Vec<&str>>();
// If the first element is "" then there was a leading "/" and we should remove it so we can check the actual count of components
if components[0] == "" {
components.remove(0);
}
if components.len() <= length {
return dir_string;
}
let truncated_components = &components[components.len() - length..];
truncated_components.join("/")
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn truncate_smaller_path_than_provided_length() {
let path = "~/starship";
let output = truncate(path.to_string(), 3);
assert_eq!(output, "~/starship")
}
#[test]
fn truncate_same_path_as_provided_length() {
let path = "~/starship/engines";
let output = truncate(path.to_string(), 3);
assert_eq!(output, "~/starship/engines")
}
#[test]
fn truncate_slightly_larger_path_than_provided_length() {
let path = "~/starship/engines/booster";
let output = truncate(path.to_string(), 3);
assert_eq!(output, "starship/engines/booster")
}
#[test]
fn truncate_larger_path_than_provided_length() {
let path = "~/starship/engines/booster/rocket";
let output = truncate(path.to_string(), 3);
assert_eq!(output, "engines/booster/rocket")
}
#[test]
fn truncate_same_path_as_provided_length_from_root() {
let path = "/starship/engines/booster";
let output = truncate(path.to_string(), 3);
assert_eq!(output, "/starship/engines/booster");
}
#[test]
fn truncate_larger_path_than_provided_length_from_root() {
let path = "/starship/engines/booster/rocket";
let output = truncate(path.to_string(), 3);
assert_eq!(output, "engines/booster/rocket");
}
}
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