fix: gracefully handle number prefixed names (#439)

src/cli/link_type.rs

@@ -43,8 +43,8 @@ pub struct LinkType {
     #[structopt(long)]
     /// Skips UI generation for this link-type.
     pub no_ui: bool,
-    #[structopt(long)]
 
+    #[structopt(long)]
     /// Skips test generation for this link-type.
     pub no_spec: bool,
 }

src/cli/web_app.rs

@@ -24,7 +24,7 @@ use crate::{
         zome::scaffold_zome_pair,
     },
     templates::ScaffoldedTemplate,
-    utils::{check_no_whitespace, input_no_whitespace, input_with_case, input_yes_or_no},
+    utils::{input_no_whitespace, input_with_case, input_yes_or_no, validate_input},
 };
 
 #[derive(Debug, StructOpt)]
@@ -57,7 +57,7 @@ impl WebApp {
         let current_dir = std::env::current_dir()?;
         let name = match self.name {
             Some(n) => {
-                check_no_whitespace(&n, "app name")?;
+                validate_input(&n, "app name")?;
                 n
             }
             None => input_no_whitespace("App name (no whitespaces):")?,

src/utils.rs

@@ -149,7 +149,7 @@ pub fn input_no_whitespace(prompt: &str) -> ScaffoldResult<String> {
         .with_prompt(prompt)
         .interact_text()?;
 
-    while let Err(e) = check_no_whitespace(&input, "Input") {
+    while let Err(e) = validate_input(&input, "Input") {
         println!("{}", e.to_string().red());
         input = Input::with_theme(&ColorfulTheme::default())
             .with_prompt(prompt)
@@ -167,17 +167,27 @@ pub fn check_case(input: &str, identifier: &str, case: Case) -> ScaffoldResult<(
             "{identifier} must be {case:?} Case",
         )));
     }
+    if input.chars().next().map_or(false, char::is_numeric) {
+        return Err(ScaffoldError::InvalidStringFormat(format!(
+            "{identifier} must not start with a number"
+        )));
+    }
     Ok(())
 }
 
 #[inline]
-/// Raises an error if input is contains white spaces
-pub fn check_no_whitespace(input: &str, identifier: &str) -> ScaffoldResult<()> {
+/// Raises an error if input is contains white spaces or starts with a numeric
+pub fn validate_input(input: &str, identifier: &str) -> ScaffoldResult<()> {
     if input.contains(char::is_whitespace) {
         return Err(ScaffoldError::InvalidStringFormat(format!(
             "{identifier} must *not* contain whitespaces.",
         )));
     }
+    if input.chars().next().map_or(false, char::is_numeric) {
+        return Err(ScaffoldError::InvalidStringFormat(format!(
+            "{identifier} must not start with a numeric"
+        )));
+    }
     Ok(())
 }