File picker config (#988)

* squashed WIP commits

* hide_gitignore working with config

* pass reference to new config parameter of file_picker()

* update config option name to match name on walk builder

* add comments to config and documentation of option to book

* add git_ignore option to WalkBuilder within prompt in commands.rs

* WIP: add FilePickerConfig struct

* WIP: cleanup

* WIP: add more options including max_depth

* WIP: changed defaults to match ignore crate defaults

* WIP: change WalkBuilder in global_search() to use config options

* WIP: removed follow_links, changed max_depth to follow config setting

* WIP: update book with file-picker inline table notation

* update documentation for file-picker config in book

* adjusted to [editor.file-picker] in book configuration.md

* adjust comments in editor.rs to be doc comments, cleanup

* adjust comments

* adjust book

5 files changed, 112 insertions, 34 deletions

diff --git a/book/src/configuration.md b/book/src/configuration.md
index be25441f..2ed48d51 100644
--- a/book/src/configuration.md
+++ b/book/src/configuration.md
@@ -24,6 +24,18 @@ To override global configuration parameters, create a `config.toml` file located
 | `completion-trigger-len` | The min-length of word under cursor to trigger autocompletion | `2` |
 | `auto-info` | Whether to display infoboxes | `true` |
 
+`[editor.filepicker]` section of the config. Sets options for file picker and global search. All but the last key listed in the default file-picker configuration below are IgnoreOptions: whether hidden files and files listed within ignore files are ignored by (not visible in) the helix file picker and global search. There is also one other key, `max-depth` available, which is not defined by default.
+
+| Key | Description | Default |
+|--|--|---------|
+|`hidden` | Enables ignoring hidden files. | true
+|`parents` | Enables reading ignore files from parent directories. | true
+|`ignore` | Enables reading `.ignore` files. | true
+|`git-ignore` | Enables reading `.gitignore` files. | true
+|`git-global` | Enables reading global .gitignore, whose path is specified in git's config: `core.excludefile` option. | true
+|`git-exclude` | Enables reading `.git/info/exclude` files. | true
+|`max-depth` | Set with an integer value for maximum depth to recurse. | Defaults to `None`.
+
 ## LSP
 
 To display all language server messages in the status line add the following to your `config.toml`:
diff --git a/helix-term/src/application.rs b/helix-term/src/application.rs
index 78b93cd9..a795a56e 100644
--- a/helix-term/src/application.rs
+++ b/helix-term/src/application.rs
@@ -120,7 +120,7 @@ impl Application {
             if first.is_dir() {
                 std::env::set_current_dir(&first)?;
                 editor.new_file(Action::VerticalSplit);
-                compositor.push(Box::new(ui::file_picker(".".into())));
+                compositor.push(Box::new(ui::file_picker(".".into(), &config.editor)));
             } else {
                 let nr_of_files = args.files.len();
                 editor.open(first.to_path_buf(), Action::VerticalSplit)?;
diff --git a/helix-term/src/commands.rs b/helix-term/src/commands.rs
index e70773eb..fde505fd 100644
--- a/helix-term/src/commands.rs
+++ b/helix-term/src/commands.rs
@@ -1440,6 +1440,7 @@ fn global_search(cx: &mut Context) {
     let (all_matches_sx, all_matches_rx) =
         tokio::sync::mpsc::unbounded_channel::<(usize, PathBuf)>();
     let smart_case = cx.editor.config.smart_case;
+    let file_picker_config = cx.editor.config.file_picker.clone();
 
     let completions = search_completions(cx, None);
     let prompt = ui::regex_prompt(
@@ -1468,41 +1469,55 @@ fn global_search(cx: &mut Context) {
 
                 let search_root = std::env::current_dir()
                     .expect("Global search error: Failed to get current dir");
-                WalkBuilder::new(search_root).build_parallel().run(|| {
-                    let mut searcher_cl = searcher.clone();
-                    let matcher_cl = matcher.clone();
-                    let all_matches_sx_cl = all_matches_sx.clone();
-                    Box::new(move |dent: Result<DirEntry, ignore::Error>| -> WalkState {
-                        let dent = match dent {
-                            Ok(dent) => dent,
-                            Err(_) => return WalkState::Continue,
-                        };
-
-                        match dent.file_type() {
-                            Some(fi) => {
-                                if !fi.is_file() {
-                                    return WalkState::Continue;
+                WalkBuilder::new(search_root)
+                    .hidden(file_picker_config.hidden)
+                    .parents(file_picker_config.parents)
+                    .ignore(file_picker_config.ignore)
+                    .git_ignore(file_picker_config.git_ignore)
+                    .git_global(file_picker_config.git_global)
+                    .git_exclude(file_picker_config.git_exclude)
+                    .max_depth(file_picker_config.max_depth)
+                    .build_parallel()
+                    .run(|| {
+                        let mut searcher_cl = searcher.clone();
+                        let matcher_cl = matcher.clone();
+                        let all_matches_sx_cl = all_matches_sx.clone();
+                        Box::new(move |dent: Result<DirEntry, ignore::Error>| -> WalkState {
+                            let dent = match dent {
+                                Ok(dent) => dent,
+                                Err(_) => return WalkState::Continue,
+                            };
+
+                            match dent.file_type() {
+                                Some(fi) => {
+                                    if !fi.is_file() {
+                                        return WalkState::Continue;
+                                    }
                                 }
+                                None => return WalkState::Continue,
                             }
-                            None => return WalkState::Continue,
-                        }
 
-                        let result_sink = sinks::UTF8(|line_num, _| {
-                            match all_matches_sx_cl
-                                .send((line_num as usize - 1, dent.path().to_path_buf()))
-                            {
-                                Ok(_) => Ok(true),
-                                Err(_) => Ok(false),
+                            let result_sink = sinks::UTF8(|line_num, _| {
+                                match all_matches_sx_cl
+                                    .send((line_num as usize - 1, dent.path().to_path_buf()))
+                                {
+                                    Ok(_) => Ok(true),
+                                    Err(_) => Ok(false),
+                                }
+                            });
+                            let result =
+                                searcher_cl.search_path(&matcher_cl, dent.path(), result_sink);
+
+                            if let Err(err) = result {
+                                log::error!(
+                                    "Global search error: {}, {}",
+                                    dent.path().display(),
+                                    err
+                                );
                             }
-                        });
-                        let result = searcher_cl.search_path(&matcher_cl, dent.path(), result_sink);
-
-                        if let Err(err) = result {
-                            log::error!("Global search error: {}, {}", dent.path().display(), err);
-                        }
-                        WalkState::Continue
-                    })
-                });
+                            WalkState::Continue
+                        })
+                    });
             } else {
                 // Otherwise do nothing
                 // log::warn!("Global Search Invalid Pattern")
@@ -2742,7 +2757,7 @@ fn command_mode(cx: &mut Context) {
 
 fn file_picker(cx: &mut Context) {
     let root = find_root(None).unwrap_or_else(|| PathBuf::from("./"));
-    let picker = ui::file_picker(root);
+    let picker = ui::file_picker(root, &cx.editor.config);
     cx.push_layer(Box::new(picker));
 }
 
diff --git a/helix-term/src/ui/mod.rs b/helix-term/src/ui/mod.rs
index 62da0dce..cdf42311 100644
--- a/helix-term/src/ui/mod.rs
+++ b/helix-term/src/ui/mod.rs
@@ -93,13 +93,22 @@ pub fn regex_prompt(
     )
 }
 
-pub fn file_picker(root: PathBuf) -> FilePicker<PathBuf> {
+pub fn file_picker(root: PathBuf, config: &helix_view::editor::Config) -> FilePicker<PathBuf> {
     use ignore::{types::TypesBuilder, WalkBuilder};
     use std::time;
 
     // We want to exclude files that the editor can't handle yet
     let mut type_builder = TypesBuilder::new();
     let mut walk_builder = WalkBuilder::new(&root);
+    walk_builder
+        .hidden(config.file_picker.hidden)
+        .parents(config.file_picker.parents)
+        .ignore(config.file_picker.ignore)
+        .git_ignore(config.file_picker.git_ignore)
+        .git_global(config.file_picker.git_global)
+        .git_exclude(config.file_picker.git_exclude)
+        .max_depth(config.file_picker.max_depth);
+
     let walk_builder = match type_builder.add(
         "compressed",
         "*.{zip,gz,bz2,zst,lzo,sz,tgz,tbz2,lz,lz4,lzma,lzo,z,Z,xz,7z,rar,cab}",
diff --git a/helix-view/src/editor.rs b/helix-view/src/editor.rs
index 364865d9..1ce33760 100644
--- a/helix-view/src/editor.rs
+++ b/helix-view/src/editor.rs
@@ -37,6 +37,46 @@ where
 
 #[derive(Debug, Clone, PartialEq, Deserialize)]
 #[serde(rename_all = "kebab-case", default, deny_unknown_fields)]
+pub struct FilePickerConfig {
+    /// IgnoreOptions
+    /// Enables ignoring hidden files.
+    /// Whether to hide hidden files in file picker and global search results. Defaults to true.
+    pub hidden: bool,
+    /// Enables reading ignore files from parent directories. Defaults to true.
+    pub parents: bool,
+    /// Enables reading `.ignore` files.
+    /// Whether to hide files listed in .ignore in file picker and global search results. Defaults to true.
+    pub ignore: bool,
+    /// Enables reading `.gitignore` files.
+    /// Whether to hide files listed in .gitignore in file picker and global search results. Defaults to true.
+    pub git_ignore: bool,
+    /// Enables reading global .gitignore, whose path is specified in git's config: `core.excludefile` option.
+    /// Whether to hide files listed in global .gitignore in file picker and global search results. Defaults to true.
+    pub git_global: bool,
+    /// Enables reading `.git/info/exclude` files.
+    /// Whether to hide files listed in .git/info/exclude in file picker and global search results. Defaults to true.
+    pub git_exclude: bool,
+    /// WalkBuilder options
+    /// Maximum Depth to recurse directories in file picker and global search. Defaults to `None`.
+    pub max_depth: Option<usize>,
+}
+
+impl Default for FilePickerConfig {
+    fn default() -> Self {
+        Self {
+            hidden: true,
+            parents: true,
+            ignore: true,
+            git_ignore: true,
+            git_global: true,
+            git_exclude: true,
+            max_depth: None,
+        }
+    }
+}
+
+#[derive(Debug, Clone, PartialEq, Deserialize)]
+#[serde(rename_all = "kebab-case", default, deny_unknown_fields)]
 pub struct Config {
     /// Padding to keep between the edge of the screen and the cursor when scrolling. Defaults to 5.
     pub scrolloff: usize,
@@ -62,6 +102,7 @@ pub struct Config {
     pub completion_trigger_len: u8,
     /// Whether to display infoboxes. Defaults to true.
     pub auto_info: bool,
+    pub file_picker: FilePickerConfig,
 }
 
 #[derive(Debug, Clone, PartialEq, Eq, Deserialize)]
@@ -93,6 +134,7 @@ impl Default for Config {
             idle_timeout: Duration::from_millis(400),
             completion_trigger_len: 2,
             auto_info: true,
+            file_picker: FilePickerConfig::default(),
         }
     }
 }