fix get_deps() implementation --WIP

Author: o2sh

src/onefetch/dependencies.rs

@@ -0,0 +1,72 @@
+use {
+    crate::onefetch::error::*,
+    std::collections::HashMap,
+    std::{ffi::OsStr, fs},
+};
+
+pub enum PackageManager {
+    Npm,
+}
+
+impl std::fmt::Display for PackageManager {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        match *self {
+            PackageManager::Npm => write!(f, "Npm"),
+        }
+    }
+}
+
+type DependencyParser = fn(&str) -> Option<i32>;
+
+struct Detector {
+    package_managers: HashMap<String, (DependencyParser, PackageManager)>,
+}
+
+fn npm(contents: &str) -> Option<i32> {
+    Some(0)
+}
+
+impl Detector {
+    pub fn new(&self) -> Detector {
+        let mut package_managers: HashMap<String, (DependencyParser, PackageManager)> =
+            HashMap::new();
+        package_managers.insert(String::from("package.json"), (npm, PackageManager::Npm));
+
+        Detector { package_managers }
+    }
+
+    pub fn get_dep_count(&self, dir: &str) -> Result<String> {
+        fn is_package_file(detector: &Detector, file_name: &str) -> bool {
+            detector
+                .package_managers
+                .iter()
+                .any(|(package_manager_file_name, _)| {
+                    file_name.starts_with(package_manager_file_name)
+                })
+        }
+
+        let package_files = fs::read_dir(dir)
+            .chain_err(|| "Could not read directory")?
+            .filter_map(std::result::Result::ok)
+            .map(|entry| entry.path())
+            .filter(|entry| {
+                entry.is_file()
+                    && entry
+                        .file_name()
+                        .map(OsStr::to_string_lossy)
+                        .map(|s| is_package_file(&self, s.as_ref()))
+                        .unwrap_or_default()
+            })
+            .map(|entry| {
+                let (parser, package_manager) =
+                    &self.package_managers[entry.file_name().unwrap().to_str().unwrap()];
+                let contents = fs::read_to_string(entry).unwrap_or_default();
+                format!("{} ({})", parser(&contents).unwrap(), package_manager)
+            })
+            .collect::<Vec<_>>();
+
+        let output = package_files.join(", ");
+
+        Ok(output)
+    }
+}

src/onefetch/deps.rs

@@ -2,6 +2,7 @@ pub mod ascii_art;
 pub mod cli;
 pub mod cli_utils;
 pub mod commit_info;
+pub mod dependencies;
 pub mod error;
 pub mod image_backends;
 pub mod info;