Use absolute path for navi when possible (#535)

src/actor.rs

@@ -75,7 +75,7 @@ fn prompt_finder(
         o
     };
 
-    let exe = fs::exe_string()?;
+    let exe = fs::exe_string();
     let extra = extra_preview.clone().unwrap_or_default();
 
     let preview = if cfg!(target_os = "windows") {
@@ -180,6 +180,13 @@ fn replace_variables_from_snippet(snippet: &str, tags: &str, variables: Variable
     Ok(interpolated_snippet)
 }
 
+pub fn with_absolute_path(snippet: String) -> String {
+    if let Some(s) = snippet.strip_prefix("navi ") {
+        return format!("{} {}", fs::exe_string(), s);
+    }
+    snippet
+}
+
 pub fn act(
     extractions: Result<extractor::Output>,
     files: Vec<String>,
@@ -197,14 +204,17 @@ pub fn act(
     env_var::set(env_var::PREVIEW_TAGS, &tags);
     env_var::set(env_var::PREVIEW_COMMENT, &comment);
 
-    let interpolated_snippet = writer::with_new_lines(
-        replace_variables_from_snippet(
+    let interpolated_snippet = {
+        let mut s = replace_variables_from_snippet(
             snippet,
             tags,
             variables.expect("No variables received from finder"),
         )
-        .context("Failed to replace variables from snippet")?,
-    );
+        .context("Failed to replace variables from snippet")?;
+        s = with_absolute_path(s);
+        s = writer::with_new_lines(s);
+        s
+    };
 
     match CONFIG.action() {
         Action::Print => {

src/finder/structures.rs

@@ -54,7 +54,7 @@ pub enum SuggestionType {
 impl Opts {
     pub fn from_config(config: &Config) -> Result<Opts> {
         let opts = Opts {
-            preview: Some(format!("{} preview {{}}", filesystem::exe_string()?)),
+            preview: Some(format!("{} preview {{}}", filesystem::exe_string())),
             overrides: config.fzf_overrides(),
             suggestion_type: SuggestionType::SnippetSelection,
             query: if config.best_match() {

src/fs.rs

@@ -67,10 +67,14 @@ fn exe_pathbuf() -> Result<PathBuf> {
     follow_symlink(pathbuf)
 }
 
-pub fn exe_string() -> Result<String> {
+fn exe_abs_string() -> Result<String> {
     pathbuf_to_string(&exe_pathbuf()?)
 }
 
+pub fn exe_string() -> String {
+    exe_abs_string().unwrap_or_else(|_| "navi".to_string())
+}
+
 pub fn create_dir(path: &Path) -> Result<()> {
     create_dir_all(path).with_context(|| {
         format!(