get: Add --raw / -r option

Fixes: #19

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ## Unreleased
 
+* New option `toml get -r` / `--raw`.
+
 
 ## 0.2.1
 

README.md

@@ -34,18 +34,21 @@ segments*, each of which is either:
  * `.KEY`, to index into a table or inline-table, or
  * `[INDEX]`, to index into an array-of-tables or array.
 
-```
-$ toml get Cargo.toml dependencies.serde
-"1.0"
-```
-
 Data is emitted by default as JSON:
 
 ```
 $ toml get Cargo.toml bin[0]
 {"name":"toml","path":"src/main.rs"}
 ```
 
+When the data is a string, the `--raw`/`-r` option prints it directly,
+for convenience in contexts like a shell script:
+
+```
+$ toml get Cargo.toml dependencies.serde --raw
+1.0
+```
+
 If you need a more complex query, consider a tool like `jq`, with
 `toml` simply transforming the file to JSON:
 
@@ -118,6 +121,7 @@ USAGE:
 FLAGS:
     -h, --help           Prints help information
         --output-toml    Print as a TOML fragment (default: print as JSON)
+    -r, --raw            Print strings raw, not as JSON
     -V, --version        Prints version information
 
 ARGS:

src/main.rs

@@ -43,6 +43,11 @@ struct GetOpts {
     /// Print as a TOML fragment (default: print as JSON)
     #[structopt(long)]
     output_toml: bool,
+
+    /// Print strings raw, not as JSON
+    // (No effect when the item isn't a string, just like `jq -r`.)
+    #[structopt(long, short)]
+    raw: bool,
 }
 
 #[derive(Debug, Fail)]
@@ -85,7 +90,14 @@ fn get(path: PathBuf, query: &str, opts: GetOpts) -> Result<(), Error> {
     }
 
     let item = walk_tpath(doc.as_item(), &tpath);
-    // TODO: support shell-friendly output like `jq -r`
+
+    if opts.raw {
+        if let Item::Value(Value::String(s)) = item {
+            println!("{}", s.value());
+            return Ok(());
+        }
+    }
+
     println!("{}", serde_json::to_string(&JsonItem(item))?);
     Ok(())
 }