1 files changed, 64 insertions, 0 deletions
diff --git a/src/commands/stdout.rs b/src/commands/stdout.rs
new file mode 100644
index 0000000..cfa214f
--- /dev/null
+++ b/src/commands/stdout.rs
@@ -0,0 +1,64 @@
+use crate::commands::change_directory::change_directory;
+use crate::context::AppContext;
+use crate::error::{AppError, AppErrorKind, AppResult};
+use crate::util::unix::expand_shell_string;
+use std::path::PathBuf;
+
+#[derive(Debug, Clone)]
+pub enum PostProcessor {
+    ChangeDirectory,
+}
+
+impl PostProcessor {
+    pub fn from_str(args: &str) -> Option<Self> {
+        match args {
+            "cd" => Some(PostProcessor::ChangeDirectory),
+            _ => None,
+        }
+    }
+}
+
+fn assert_one_line(stdout: &str) -> AppResult {
+    match stdout.lines().count() {
+        1 => Ok(()),
+        _ => Err(AppError::new(AppErrorKind::StateError, "The last `capture` stdout does not have exactly one line as expected for this stdout processor".to_string()))
+    }
+}
+
+fn as_one_existing_directory(stdout: &str) -> AppResult<PathBuf> {
+    assert_one_line(stdout)?;
+    let path = expand_shell_string(stdout);
+    if path.exists() {
+        if path.is_file() {
+            if let Some(parent) = path.parent() {
+                Ok(parent.to_path_buf())
+            } else {
+                Err(AppError::new(AppErrorKind::StateError, "The last `capture` output is a file but without a valid directory as parent in the file system".to_string()))
+            }
+        } else {
+            Ok(path.to_path_buf())
+        }
+    } else {
+        Err(AppError::new(
+            AppErrorKind::StateError,
+            "The last `capture` output line is not an existing path".to_string(),
+        ))
+    }
+}
+
+pub fn post_process_std_out(processor: &PostProcessor, context: &mut AppContext) -> AppResult {
+    let last_stdout = &context.last_stdout;
+    if let Some(stdout) = last_stdout {
+        let stdout = stdout.trim();
+        match processor {
+            PostProcessor::ChangeDirectory => {
+                change_directory(context, as_one_existing_directory(stdout)?.as_path())
+            }
+        }
+    } else {
+        Err(AppError::new(
+            AppErrorKind::StateError,
+            "No result from a former `shell` available".to_string(),
+        ))
+    }
+}