From 4364e44c318c3deb3ce20d579721d8831288afca Mon Sep 17 00:00:00 2001
From: Anish Agnihotri <contact@anishagnihotri.com>
Date: Mon, 20 Sep 2021 01:04:26 -0400
Subject: [PATCH] Seth: --to-dec

---
 dapptools/src/seth.rs      |  3 +++
 dapptools/src/seth_opts.rs |  3 +++
 seth/src/lib.rs            | 13 +++++++++++++
 3 files changed, 19 insertions(+)

diff --git a/dapptools/src/seth.rs b/dapptools/src/seth.rs
index 6d847fadbabe..5e318eb9f7b2 100644
--- a/dapptools/src/seth.rs
+++ b/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)?));
         }
diff --git a/dapptools/src/seth_opts.rs b/dapptools/src/seth_opts.rs
index b542a2cfbe34..0e98e54f5e28 100644
--- a/dapptools/src/seth_opts.rs
+++ b/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> },
diff --git a/seth/src/lib.rs b/seth/src/lib.rs
index 8506f0533678..01a1b06c975a 100644
--- a/seth/src/lib.rs
+++ b/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
     ///
     /// ```