Make --map behave as function body (#468)

docs/cheatsheet_syntax.md

@@ -57,7 +57,7 @@ docker rmi <image_id>
 echo <mapped>
 
 $ image_id: docker images --- --column 3 --header-lines 1 --delimiter '\s\s+'
-$ mapped: echo 'false true' | tr ' ' '\n' --- --map "[[ $0 == t* ]] && echo 1 || echo 0"
+$ mapped: echo 'false true' | tr ' ' '\n' --- --map "[[ $1 == t* ]] && echo 1 || echo 0"
 ```
 
 The supported parameters are:
@@ -135,8 +135,7 @@ true \
 
 ```sh
 # This will result into: cat "file1.json" "file2.json"
-jsons=($(echo "<jsons>"))
-cat "${jsons[@]}"
+cat <jsons>
 
-$ jsons: find . -iname '*.json' -type f -print --- --multi
+$ jsons: find . -iname '*.json' -type f -print --- --multi --map "sed -e 's/^.*$/\"&\"/' | tr '\n' ' '
 ```

src/finder.rs

@@ -26,10 +26,23 @@ pub trait Finder {
 
 fn apply_map(text: String, map_fn: Option<String>) -> String {
     if let Some(m) = map_fn {
+        let cmd = format!(
+            r#"
+_navi_map_fn() {{
+  {}
+}}
+                
+read -r -d '' _navi_input <<'NAVIEOF'
+{}
+NAVIEOF
+
+echo "$_navi_input" | _navi_map_fn"#,
+            m, text
+        );
+
         let output = Command::new("bash")
             .arg("-c")
-            .arg(m.as_str())
-            .arg(text.as_str())
+            .arg(cmd.as_str())
             .stderr(Stdio::inherit())
             .output()
             .expect("Failed to execute map function");

tests/cheats/more_cases.cheat

@@ -53,6 +53,9 @@ echo description blank
 # x
 echo description one character
 
+# map can be used to expand into multiple arguments
+echo <phrases>
+
 # Concatenate pdf files
 files=($(echo "<files>"))
 echo pdftk "${files[@]:-}" cat output <pdf_output>
@@ -65,10 +68,11 @@ $ table_elem: echo -e '0  rust      rust-lang.org\n1  clojure   clojure.org' ---
 $ table_elem2: echo -e '0;rust;rust-lang.org\n1;clojure;clojure.org' --- --column 2 --delimiter ';'
 $ multi_col: ls -la | awk '{print $1, $9}' --- --column 2 --delimiter '\s' --multi
 $ langs: echo 'clojure rust javascript' | tr ' ' '\n' --- --multi
-$ mapped: echo 'true false' | tr ' ' '\n' --- --map "[[ $0 == t* ]] && echo 1 || echo 0"
+$ mapped: echo 'true false' | tr ' ' '\n' --- --map "[[ $1 == t* ]] && echo 1 || echo 0"
 $ examples: echo -e 'foo bar\nlorem ipsum\ndolor sit' --- --multi
 $ multiword: echo -e 'foo bar\nlorem ipsum\ndolor sit\nbaz'i
 $ file: ls . --- --preview 'cat {}' --preview-window 'right:50%'
+$ phrases: echo -e "foo bar\nlorem ipsum\ndolor sit" --- --multi --map "sed -e 's/^.*$/\"&\"/' | tr '\n' ' '"
 
 # this should be displayed
 echo hi