Fix --map when using zsh

Fixes #584

src/actor.rs

@@ -67,8 +67,6 @@ fn prompt_finder(
 
     let exe = fs::exe_string();
 
-    let subshell_prefix = if CONFIG.shell().contains("fish") { "" } else { "$" };
-
     let preview = if cfg!(target_os = "windows") {
         format!(
             r#"(@echo.{{+}}{eof}{{q}}{eof}{name}{eof}{extra}) | {exe} preview-var-stdin"#,
@@ -77,18 +75,27 @@ fn prompt_finder(
             extra = extra_preview.clone().unwrap_or_default(),
             eof = EOF,
         )
+    } else if CONFIG.shell().contains("fish") {
+        format!(
+            r#"{exe} preview-var "{{+}}" "{{q}}" "{name}"; {extra}"#,
+            exe = exe,
+            name = variable_name,
+            extra = extra_preview
+                .clone()
+                .map(|e| format!(" echo; {}", e))
+                .unwrap_or_default(),
+        )
     } else {
         format!(
-            r#"{exe} preview-var "{subshell_prefix}(cat <<{eof}
+            r#"{exe} preview-var "$(cat <<{eof}
 {{+}}
 {eof}
-)" "{subshell_prefix}(cat <<{eof}
+)" "$(cat <<{eof}
 {{q}}
 {eof}
 )" "{name}"; {extra}"#,
             exe = exe,
             name = variable_name,
-            subshell_prefix = subshell_prefix,
             extra = extra_preview
                 .clone()
                 .map(|e| format!(" echo; {}", e))

src/finder/post.rs

@@ -1,3 +1,4 @@
+use crate::config::CONFIG;
 use crate::finder::structures::SuggestionType;
 use crate::shell;
 use anyhow::Context;
@@ -7,21 +8,30 @@ use std::process::Stdio;
 
 fn apply_map(text: String, map_fn: Option<String>) -> Result<String> {
     if let Some(m) = map_fn {
-        let cmd = format!(
-            r#"
+        let cmd = if CONFIG.shell().contains("fish") {
+            format!(r#"printf "%s" "{text}" | {m}"#, m = m, text = text)
+        } else {
+            format!(
+                r#"_navi_input() {{
+cat <<'{eof}'
+{text}
+{eof}
+}}
+
 _navi_map_fn() {{
   {m}
 }}
-                
-read -r -d '' _navi_input <<'{eof}'
-{text}
-{eof}
 
-echo "$_navi_input" | _navi_map_fn"#,
-            m = m,
-            text = text,
-            eof = EOF
-        );
+_navi_nonewline() {{
+  printf "%s" "$(cat)"
+}}
+
+_navi_input | _navi_map_fn | _navi_nonewline"#,
+                m = m,
+                text = text,
+                eof = EOF
+            )
+        };
 
         let output = shell::out()
             .arg(cmd.as_str())