:previous_same_depth and :next_same_depth internals

This can be tested with

```
[[verbs]]
invocation = "psd"
key = "ctrl-up"
internal = ":previous_same_depth"

[[verbs]]
invocation = "nsd"
key = "ctrl-down"
internal = ":next_same_depth"
```

I'm not sure it's really useful but it's costless and allows
experimentations.

Fix #308

6 files changed, 41 insertions, 2 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8005ef0..9d5bfc2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+### next
+* :previous_same_depth and :next_same_depth internals
+
 <a name="v1.0.6"></a>
 ### v1.0.6 - 2020-11-19
 * optional icons, thanks to @asdf8dfafjk (@fiAtcBr on Miaou) - See https://dystroy.org/broot/icons
diff --git a/Cargo.lock b/Cargo.lock
index e96b322..0cef8cf 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -115,7 +115,7 @@ dependencies = [
 
 [[package]]
 name = "broot"
-version = "1.0.6"
+version = "1.0.7-dev"
 dependencies = [
  "ansi_colours",
  "bet",
diff --git a/Cargo.toml b/Cargo.toml
index 5d52c30..54aec06 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "broot"
-version = "1.0.6"
+version = "1.0.7-dev"
 authors = ["dystroy <denys.seguret@gmail.com>"]
 repository = "https://github.com/Canop/broot"
 documentation = "https://dystroy.org/broot"
diff --git a/src/browser/browser_state.rs b/src/browser/browser_state.rs
index 8e9d3f8..f1a9b60 100644
--- a/src/browser/browser_state.rs
+++ b/src/browser/browser_state.rs
@@ -302,6 +302,14 @@ impl AppState for BrowserState {
                 self.displayed_tree_mut().try_select_next_match();
                 AppStateCmdResult::Keep
             }
+            Internal::previous_same_depth => {
+                self.displayed_tree_mut().try_select_previous_same_depth();
+                AppStateCmdResult::Keep
+            }
+            Internal::next_same_depth => {
+                self.displayed_tree_mut().try_select_next_same_depth();
+                AppStateCmdResult::Keep
+            }
             Internal::page_down => {
                 let tree = self.displayed_tree_mut();
                 if page_height < tree.lines.len() as i32 {
diff --git a/src/tree/tree.rs b/src/tree/tree.rs
index 8ac8a79..cda58c5 100644
--- a/src/tree/tree.rs
+++ b/src/tree/tree.rs
@@ -294,6 +294,32 @@ impl Tree {
         }
         false
     }
+    pub fn try_select_previous_same_depth(&mut self) -> bool {
+        let depth = self.lines[self.selection].depth;
+        for di in (0..self.lines.len()).rev() {
+            let idx = (self.selection + di) % self.lines.len();
+            let line = &self.lines[idx];
+            if !line.is_selectable() || line.depth != depth {
+                continue;
+            }
+            self.selection = idx;
+            return true;
+        }
+        false
+    }
+    pub fn try_select_next_same_depth(&mut self) -> bool {
+        let depth = self.lines[self.selection].depth;
+        for di in 0..self.lines.len() {
+            let idx = (self.selection + di + 1) % self.lines.len();
+            let line = &self.lines[idx];
+            if !line.is_selectable() || line.depth != depth {
+                continue;
+            }
+            self.selection = idx;
+            return true;
+        }
+        false
+    }
     pub fn try_select_previous_match(&mut self) -> bool {
         for di in (0..self.lines.len()).rev() {
             let idx = (self.selection + di) % self.lines.len();
diff --git a/src/verb/internal.rs b/src/verb/internal.rs
index ca2f48c..3c80763 100644
--- a/src/verb/internal.rs
+++ b/src/verb/internal.rs
@@ -69,6 +69,7 @@ Internals! {
     open_stay_filter: "display the directory, keeping the current pattern",
     open_leave: "open file or directory according to OS (quit broot)",
     next_match: "select the next match",
+    next_same_depth: "select the next file at the same depth",
     no_sort: "don't sort",
     page_down: "scroll one page down",
     page_up: "scroll one page up",
@@ -76,6 +77,7 @@ Internals! {
     panel_left: "focus panel on left",
     panel_right: "focus panel on right",
     previous_match: "select the previous match",
+    previous_same_depth: "select the previous file at the same depth",
     open_preview: "open the preview panel",
     close_preview: "close the preview panel",
     toggle_preview: "open/close the preview panel",