Seth: --to-dec

dapptools/src/seth.rs

@@ -22,6 +22,9 @@ async fn main() -> eyre::Result<()> {
         Subcommands::ToBytes32 { bytes } => {
             println!("{}", SimpleSeth::to_bytes32(&bytes)?);
         }
+        Subcommands::ToDec { hexvalue } => {
+            println!("{}", SimpleSeth::to_dec(hexvalue));
+        }
         Subcommands::ToFix { decimals, value } => {
             println!("{}", SimpleSeth::to_fix(unwrap_or_stdin(decimals)?, unwrap_or_stdin(value)?));
         }

dapptools/src/seth_opts.rs

@@ -23,6 +23,9 @@ pub enum Subcommands {
     #[structopt(name = "--to-bytes32")]
     #[structopt(about = "left-pads a hex bytes string to 32 bytes)")]
     ToBytes32 { bytes: String },
+    #[structopt(name = "--to-dec")]
+    #[structopt(about = "convert hex value into a decimal number")]
+    ToDec { hexvalue: String },
     #[structopt(name = "--to-fix")]
     #[structopt(about = "convert integers into fixed point with specified decimals")]
     ToFix { decimals: Option<u128>, value: Option<u128> },

seth/src/lib.rs

@@ -303,6 +303,19 @@ impl SimpleSeth {
         format!("0x{}", s)
     }
 
+    /// Converts hex input to decimal
+    ///
+    /// ```
+    /// use seth::SimpleSeth as Seth;
+    ///
+    /// assert_eq!(424242, Seth::to_dec("0x67932"));
+    /// assert_eq!(1234, Seth::to_dec("0x4d2"));
+    /// ```
+    pub fn to_dec(hex: String) -> u128 {
+        let hex_trimmed = hex.trim_start_matches("0x");
+        u128::from_str_radix(&hex_trimmed, 16).expect("Could not parse hex")
+    }
+
     /// Converts integers with specified decimals into fixed point numbers
     ///
     /// ```