Replace text interpolation with use of nameof

src/std/text.ab

@@ -1,32 +1,17 @@
-// Replace this with builtin if/when we get around to writing one.
-#[allow_absurd_cast]
-fun bash_version(): Num {
-    let major = trust $ echo "\$\{BASH_VERSINFO[0]}" $ as Num
-    let minor = trust $ echo "\$\{BASH_VERSINFO[1]}" $ as Num
-    return (major * 100) + minor
-}
-
 /// Replaces all occurrences of a pattern in the content with the provided replace text.
 pub fun replace(source, search, replace) {
     // Here we use commands for assigning values to avoid the side effect of Amber
-    // Escape `\` as `\\`.
-    trust $ {nameof search}="\$\{{nameof search}//\\\\/\\\\\\\}" $
-    if bash_version() >= 502 {
-        trust $ {nameof replace}="\$\{{nameof replace}//\\\\/\\\\\\\\}" $
-    }
-
-    return trust $ echo "\$\{{nameof source}//{search}/{replace}}" $
+    let result = ""
+    trust $ {nameof result}="\$\{{nameof source}//\"\$\{{nameof search}}\"/\"\$\{{nameof replace}}\"}" $
+    return result
 }
 
 /// Replaces the first occurrence of a pattern in the content with the provided replace text.
 pub fun replace_one(source, search, replace) {
     // Here we use commands for assigning values to avoid the side effect of Amber
-    trust $ {nameof search}="\$\{{nameof search}//\\\\/\\\\\\\}" $
-    if bash_version() >= 502 {
-        trust $ {nameof replace}="\$\{{nameof replace}//\\\\/\\\\\\\\}" $
-    }
-
-    return trust $ echo "\$\{{nameof source}/{search}/{replace}}" $
+    let result = ""
+    trust $ {nameof result}="\$\{{nameof source}/\"\$\{{nameof search}}\"/\"\$\{{nameof replace}}\"}" $
+    return result
 }
 
 /// Replaces all occurrences of a regex pattern in the content with the provided replace text.