Use clap's dynamic String feature rather than another dependency

Cargo.toml

@@ -35,7 +35,7 @@ pkg-fmt = "zip"
 
 [dependencies]
 regex = "1.10.4"
-clap = { version = "4.0.0", features = ["cargo", "env", "wrap_help"] }
+clap = { version = "4.0.0", features = ["cargo", "env", "wrap_help", "string"] }
 itertools = "0.11.0"
 typed-arena = "2.0.2"
 rustc-hash = "2.0.0"
@@ -55,7 +55,6 @@ radix-heap = "0.4.2"
 # a slightly more aggressive MSRV than difftastic. Constrain ignore to
 # a known-good max version.
 ignore = ">= 0.4, < 0.4.24"
-const_format = "0.2.22"
 owo-colors = "3.5.0"
 wu-diff = "0.1.2"
 rayon = "1.7.0"

src/options.rs

@@ -8,7 +8,6 @@ use std::{
 };
 
 use clap::{crate_authors, crate_description, value_parser, Arg, ArgAction, Command};
-use const_format::formatcp;
 use crossterm::tty::IsTty;
 use itertools::Itertools;
 
@@ -169,7 +168,7 @@ fn app() -> clap::Command {
                 .action(ArgAction::Set)
                 .long_help("Treat a tab as this many spaces.")
                 .env("DFT_TAB_WIDTH")
-                .default_value(formatcp!("{}", DEFAULT_TAB_WIDTH))
+                .default_value(format!("{}", DEFAULT_TAB_WIDTH))
                 .value_parser(clap::value_parser!(usize))
                 .required(false),
         )
@@ -287,7 +286,7 @@ When multiple overrides are specified, the first matching override wins."))
                 .value_name("LIMIT")
                 .action(ArgAction::Set)
                 .help("Use a text diff if either input file exceeds this size.")
-                .default_value(formatcp!("{}", DEFAULT_BYTE_LIMIT))
+                .default_value(format!("{}", DEFAULT_BYTE_LIMIT))
                 .env("DFT_BYTE_LIMIT")
                 .value_parser(clap::value_parser!(usize))
                 .required(false),
@@ -296,7 +295,7 @@ When multiple overrides are specified, the first matching override wins."))
             Arg::new("graph-limit").long("graph-limit")
                 .value_name("LIMIT")
                 .help("Use a text diff if the structural graph exceed this number of nodes in memory.")
-                .default_value(formatcp!("{}", DEFAULT_GRAPH_LIMIT))
+                .default_value(format!("{}", DEFAULT_GRAPH_LIMIT))
                 .action(ArgAction::Set)
                 .env("DFT_GRAPH_LIMIT")
                 .value_parser(clap::value_parser!(usize))
@@ -307,7 +306,7 @@ When multiple overrides are specified, the first matching override wins."))
                 .value_name("LIMIT")
                 .action(ArgAction::Set)
                 .help("Use a text diff if the number of parse errors exceeds this value.")
-                .default_value(formatcp!("{}", DEFAULT_PARSE_ERROR_LIMIT))
+                .default_value(format!("{}", DEFAULT_PARSE_ERROR_LIMIT))
                 .env("DFT_PARSE_ERROR_LIMIT")
                 .value_parser(clap::value_parser!(usize))
                 .required(false),