Unindent main block (#654)

* Unindent code in main block.

* Cap indentation level at zero.

* Add TODO comment as requested.

src/modules/main.rs

@@ -73,7 +73,15 @@ impl TranslateModule for Main {
                 String::new,
                 |name| format!("declare -r {name}=({quote}{dollar}0{quote} {quote}{dollar}@{quote})")
             );
-            format!("{args}\n{}", self.block.translate(meta))
+            // Temporarily decrease the indentation level to counteract
+            // the indentation applied by the block translation.  Unlike
+            // other instances of code blocks, we do not want to indent
+            // the code generated from the main block.
+            // TODO: Rethink as part of the Bash output improvement work.
+            meta.decrease_indent();
+            let result = format!("{args}\n{}", self.block.translate(meta));
+            meta.increase_indent();
+            result
         }
     }
 }

src/utils/metadata/translate.rs

@@ -1,3 +1,4 @@
+use std::cmp;
 use std::collections::VecDeque;
 
 use crate::compiler::CompilerOptions;
@@ -50,7 +51,7 @@ impl TranslateMetadata {
     }
 
     pub fn gen_indent(&self) -> String {
-        INDENT_SPACES.repeat(self.indent as usize)
+        INDENT_SPACES.repeat(cmp::max(self.indent, 0) as usize)
     }
 
     pub fn increase_indent(&mut self) {