Add support for stderr and split output handling.

More percent sign doubling support.

example.rsh

@@ -13,9 +13,13 @@ if %echo some words%.contains("me wo") {
 let mem = %free -h%.lines().nth(1).unwrap()
     .split_whitespace().nth(3).unwrap().to_owned();
 
+let (_stdout, _stderr) = %^curl bob%;
+println!("Collect stdout and stderr separately!");
+
 // for i in 0..10000 {
 //     println!("x contains %% example? [{}]", x.contains("example"));
 // }
 
+%echo Double-up your percent signs to display them literally 100%%!%
+
 println!("There are {} of memory free", &mem);
-%echo hello%

src/main.rs

@@ -1,5 +1,3 @@
-#![feature(option_result_contains)]
-
 use anyhow::{bail, Result};
 
 use std::env;
@@ -16,12 +14,12 @@ use std::process::Command;
 
 #[derive(PartialEq, Clone)]
 enum PrintType {
-    Out, Err, All
+    StdOut, StdErr, AllOutputs
 }
 
-fn com(print: &PrintType, command_string: &str) -> String {
+fn com(print: &PrintType, command_text: &str) -> String {
     let command_output = Command::new("bash").arg("-c")
-        .arg(command_string)
+        .arg(command_text)
         .output().unwrap();
 
     let to_string = |bytes| str::from_utf8(bytes).unwrap().to_string();
@@ -29,9 +27,9 @@ fn com(print: &PrintType, command_string: &str) -> String {
     let err = to_string(&command_output.stderr);
 
     match print {
-        PrintType::Out => { print!("{}", out); out },
+        PrintType::StdOut => { print!("{}", out); out },
-        PrintType::Err => { print!("{}", err); err },
+        PrintType::StdErr => { print!("{}", err); err },
-        PrintType::All => {
+        PrintType::AllOutputs => {
             print!("{}", out);
             if err.trim().is_empty() {
                 print!("{}", err);
@@ -68,7 +66,11 @@ fn output_filename(script_name: &str) -> String {
 }
 
 fn run_compiled(script_name: &str) {
-    com(&PrintType::All, &output_filename(script_name));
+    com(&PrintType::AllOutputs, &output_filename(script_name));
+}
+
+fn contains<T: std::cmp::PartialEq>(opt: Option<T>, value: T) -> bool {
+    opt.is_some() && opt.unwrap() == value
 }
 
 fn parse_bash_command(
@@ -76,12 +78,28 @@ fn parse_bash_command(
     code: &mut String,
     is_expr: bool
 ) -> Result<()> {
-    code.push_str(&format!("com({}, \"", !is_expr));
+    let next = iter.peek().expect("Unexpected EOF");
+    code.push_str(&(match next {
+        '^' => {
+            iter.next();
+            format!("out_and_err_com({}, \"", !is_expr)
+        },
+        '?' => {
+            iter.next();
+            format!("stderr_com({}, \"", !is_expr)
+        },
+        _ => format!("stdout_com({}, \"", !is_expr)
+    }));
     loop {
         if let Some(c) = iter.next() {
             if c == '%' {
+                // Double percents count as a single literal percent
+                if contains(iter.peek(), &'%') {
+                    iter.next();
+                } else {
                     break;
                 }
+            }
             code.push(c);
         } else {
             bail!("Unexpected end-of-file while parsing bash command");
@@ -89,7 +107,7 @@ fn parse_bash_command(
     }
     code.push_str("\")");
     let peek = iter.peek();
-    if !is_expr && (peek.is_none() || peek.contains(&&' ') || peek.contains(&&'\n')) {
+    if !is_expr && (peek.is_none() || contains(peek, &&' ') || contains(peek, &&'\n')) {
         code.push(';');
     }
     Ok(())
@@ -98,23 +116,45 @@ fn parse_bash_command(
 fn collect_code(script_name: &str) -> Result<String> {
     let script = fs::read_to_string(&script_name)?;
 
-    let mut code = "
+    let mut code =
+"#![allow(dead_code)]
+
 use std::str;
 use std::process::Command;
 
-fn com(print: bool, comcom: &str) -> String {
+fn stdout_com(print: bool, command_text: &str) -> String {
     let s = str::from_utf8(&Command::new(\"bash\").arg(\"-c\")
-    .arg(comcom).output().unwrap().stdout).unwrap().to_string();
+        .arg(command_text).output().unwrap().stdout).unwrap().to_string();
     if print {
         print!(\"{}\", s)
     };
     return s;
 }
 
-fn main() {
+fn stderr_com(print: bool, command_text: &str) -> String {
+    let s = str::from_utf8(&Command::new(\"bash\").arg(\"-c\")
+        .arg(command_text).output().unwrap().stderr).unwrap().to_string();
+    if print {
+        print!(\"{}\", s)
+    };
+    return s;
+}
+
+fn out_and_err_com(print: bool, command_text: &str) -> (String, String) {
+    let output = Command::new(\"bash\").arg(\"-c\")
+        .arg(command_text).output().unwrap();
+    let stdout = str::from_utf8(&output.stdout).unwrap().to_string();
+    let stderr = str::from_utf8(&output.stderr).unwrap().to_string();
+    if print {
+        print!(\"{}\", stdout);
+        eprint!(\"{}\", stderr);
+    };
+    return (stdout, stderr);
+}
+
+fn main() -> std::io::Result<()> {
 ".to_string();
 
-    let mut is_expr = false;
 
     let mut iter = script.chars().peekable();
     if script.starts_with("#!/") {
@@ -125,10 +165,11 @@ fn main() {
         }
     }
 
+    let mut is_expr = false;
     while let Some(c) = iter.next() {
         if c == '%' {
             // Double percents count as a single literal percent
-            if iter.peek().contains(&&'%') {
+            if contains(iter.peek(), &&'%') {
                 code.push('%');
                 iter.next();
             } else {
@@ -136,13 +177,13 @@ fn main() {
             }
         } else {
             code.push(c);
-            if (c == 'i' && iter.peek().contains(&&'f'))
+            if (c == 'i' && contains(iter.peek(), &&'f'))
-            || (c == '=' && !iter.peek().contains(&&'=')) {
+            || (c == '=' && !contains(iter.peek(), &&'=')) {
                 is_expr = true;
-            } else if c == 'f' && iter.peek().contains(&&'o') {
+            } else if c == 'f' && contains(iter.peek(), &&'o') {
                 iter.next();
                 code.push('o');
-                if iter.peek().contains(&&'r') {
+                if contains(iter.peek(), &&'r') {
                     is_expr = true;
                 }
             } else if (c == '{' || c == ';') && is_expr {
@@ -152,7 +193,7 @@ fn main() {
             }
         }
     }
-    code.push('}');
+    code.push_str("    Ok(())\n}");
     return Ok(code);
 }
 
@@ -182,7 +223,7 @@ fn main() -> Result<()> {
             code_filename,
             output_filename(&script_name)
         );
-        com(&PrintType::Err, &compile_command);
+        com(&PrintType::StdErr, &compile_command);
         println!("[Compiled in {}ms]\n", now.elapsed().as_millis());
         run_compiled(&script_name);
     }