fix(layout): total layout percent 100 validation (#57)

* Fix for issue #52

* Added missing fixtures.

* Added missing validation.

* Moved layout creation and validation to the Layout struct.

* Ran cargo fmt.

* Added creation of tmp folder if needed.

* Code review edit.

* Code review edit.

* Fancied code up.

* PR request change.

* PR code review.

* Merge from upstream/main.

* Merge from upstream/main.

6 files changed, 149 insertions, 32 deletions

diff --git a/src/layout.rs b/src/layout.rs
index d557a17c..97ff455c 100644
--- a/src/layout.rs
+++ b/src/layout.rs
@@ -1,5 +1,7 @@
-use crate::terminal_pane::PositionAndSize;
 use serde::{Deserialize, Serialize};
+use std::{fs::File, io::prelude::*, path::PathBuf};
+
+use crate::terminal_pane::PositionAndSize;
 
 fn split_space_to_parts_vertically(
     space_to_split: &PositionAndSize,
@@ -65,12 +67,17 @@ fn split_space(space_to_split: &PositionAndSize, layout: &Layout) -> Vec<Positio
         .parts
         .iter()
         .map(|part| {
-            let split_size = part.split_size.as_ref().unwrap(); // TODO: if there is no split size, it should get the remaining "free space"
+            let split_size = part.split_size.as_ref();
             match split_size {
-                SplitSize::Percent(percent) => *percent,
+                Some(SplitSize::Percent(percent)) => *percent,
+                None => {
+                    // TODO: if there is no split size, it should get the remaining "free space"
+                    panic!("Please enter the percentage of the screen part");
+                }
             }
         })
         .collect();
+
     let split_parts = match layout.direction {
         Direction::Vertical => split_space_to_parts_vertically(space_to_split, percentages),
         Direction::Horizontal => split_space_to_parts_horizontally(space_to_split, percentages),
@@ -87,6 +94,34 @@ fn split_space(space_to_split: &PositionAndSize, layout: &Layout) -> Vec<Positio
     pane_positions
 }
 
+fn validate_layout_percentage_total(layout: &Layout) -> bool {
+    let total_percentages: u8 = layout
+        .parts
+        .iter()
+        .map(|part| {
+            let split_size = part.split_size.as_ref();
+            match split_size {
+                Some(SplitSize::Percent(percent)) => *percent,
+                None => {
+                    // TODO: if there is no split size, it should get the remaining "free space"
+                    panic!("Please enter the percentage of the screen part");
+                }
+            }
+        })
+        .sum();
+    if total_percentages != 100 {
+        return false;
+    }
+
+    for part in layout.parts.iter() {
+        if part.parts.len() > 0 {
+            return validate_layout_percentage_total(part);
+        }
+    }
+
+    true
+}
+
 #[derive(Debug, Serialize, Deserialize, Clone)]
 pub enum Direction {
     Horizontal,
@@ -108,6 +143,28 @@ pub struct Layout {
 }
 
 impl Layout {
+    pub fn new(layout_path: PathBuf) -> Self {
+        let mut layout_file = File::open(&layout_path)
+            .expect(&format!("cannot find layout {}", &layout_path.display()));
+
+        let mut layout = String::new();
+        layout_file
+            .read_to_string(&mut layout)
+            .expect(&format!("could not read layout {}", &layout_path.display()));
+        let layout: Layout = serde_yaml::from_str(&layout).expect(&format!(
+            "could not parse layout {}",
+            &layout_path.display()
+        ));
+        layout.validate();
+
+        layout
+    }
+
+    pub fn validate(&self) {
+        if !validate_layout_percentage_total(&self) {
+            panic!("The total percent for each part should equal 100.");
+        }
+    }
     pub fn total_panes(&self) -> usize {
         let mut total_panes = 0;
         total_panes += self.parts.len();
diff --git a/src/main.rs b/src/main.rs
index 683874f4..f8f2ca3b 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -18,7 +18,6 @@ use std::sync::mpsc::{channel, Receiver, Sender};
 use std::thread;
 
 use serde::{Deserialize, Serialize};
-use serde_yaml;
 use structopt::StructOpt;
 
 use crate::command_is_executing::CommandIsExecuting;
@@ -61,14 +60,14 @@ pub struct Opt {
 
 pub fn main() {
     let opts = Opt::from_args();
-    if opts.split.is_some() {
-        match opts.split {
-            Some('h') => {
+    if let Some(split_dir) = opts.split {
+        match split_dir {
+            'h' => {
                 let mut stream = UnixStream::connect(MOSAIC_IPC_PIPE).unwrap();
                 let api_command = bincode::serialize(&ApiCommand::SplitHorizontally).unwrap();
                 stream.write_all(&api_command).unwrap();
             }
-            Some('v') => {
+            'v' => {
                 let mut stream = UnixStream::connect(MOSAIC_IPC_PIPE).unwrap();
                 let api_command = bincode::serialize(&ApiCommand::SplitVertically).unwrap();
                 stream.write_all(&api_command).unwrap();
@@ -79,9 +78,8 @@ pub fn main() {
         let mut stream = UnixStream::connect(MOSAIC_IPC_PIPE).unwrap();
         let api_command = bincode::serialize(&ApiCommand::MoveFocus).unwrap();
         stream.write_all(&api_command).unwrap();
-    } else if opts.open_file.is_some() {
+    } else if let Some(file_to_open) = opts.open_file {
         let mut stream = UnixStream::connect(MOSAIC_IPC_PIPE).unwrap();
-        let file_to_open = opts.open_file.unwrap();
         let api_command = bincode::serialize(&ApiCommand::OpenFile(file_to_open)).unwrap();
         stream.write_all(&api_command).unwrap();
     } else {
@@ -99,7 +97,7 @@ pub fn start(mut os_input: Box<dyn OsApi>, opts: Opt) {
 
     let command_is_executing = CommandIsExecuting::new();
 
-    let _ = delete_log_dir();
+    delete_log_dir().unwrap();
     delete_log_file().unwrap();
 
     let full_screen_ws = os_input.get_terminal_size_using_fd(0);
@@ -130,6 +128,10 @@ pub fn start(mut os_input: Box<dyn OsApi>, opts: Opt) {
         os_input.clone(),
         opts.debug,
     );
+    let maybe_layout = opts.layout.and_then(|layout_path| {
+        let layout = Layout::new(layout_path);
+        Some(layout)
+    });
 
     active_threads.push(
         thread::Builder::new()
@@ -137,26 +139,12 @@ pub fn start(mut os_input: Box<dyn OsApi>, opts: Opt) {
             .spawn({
                 let mut command_is_executing = command_is_executing.clone();
                 move || {
-                    match opts.layout {
-                        Some(layout_path) => {
-                            use std::fs::File;
-                            let mut layout_file = File::open(&layout_path)
-                                .expect(&format!("cannot find layout {}", layout_path.display()));
-                            let mut layout = String::new();
-                            layout_file.read_to_string(&mut layout).expect(&format!(
-                                "could not read layout {}",
-                                layout_path.display()
-                            ));
-                            let layout: Layout = serde_yaml::from_str(&layout).expect(&format!(
-                                "could not parse layout {}",
-                                layout_path.display()
-                            ));
-                            pty_bus.spawn_terminals_for_layout(layout);
-                        }
-                        None => {
-                            pty_bus.spawn_terminal_vertically(None);
-                        }
+                    if let Some(layout) = maybe_layout {
+                        pty_bus.spawn_terminals_for_layout(layout);
+                    } else {
+                        pty_bus.spawn_terminal_vertically(None);
                     }
+
                     loop {
                         let event = pty_bus
                             .receive_pty_instructions
diff --git a/src/tests/fixtures/layouts/parts-total-less-than-100-percent.yaml b/src/tests/fixtures/layouts/parts-total-less-than-100-percent.yaml
new file mode 100644
index 00000000..e1a1a607
--- /dev/null
+++ b/src/tests/fixtures/layouts/parts-total-less-than-100-percent.yaml
@@ -0,0 +1,16 @@
+---
+    direction: Horizontal
+    parts:
+      - direction: Vertical
+        parts:
+          - direction: Horizontal
+            split_size:
+              Percent: 20
+          - direction: Horizontal
+            split_size:
+              Percent: 50
+        split_size:
+          Percent: 80
+      - direction: Vertical
+        split_size:
+          Percent: 20
diff --git a/src/tests/fixtures/layouts/parts-total-more-than-100-percent.yaml b/src/tests/fixtures/layouts/parts-total-more-than-100-percent.yaml
new file mode 100644
index 00000000..33d94225
--- /dev/null
+++ b/src/tests/fixtures/layouts/parts-total-more-than-100-percent.yaml
@@ -0,0 +1,16 @@
+---
+    direction: Horizontal
+    parts:
+      - direction: Vertical
+        parts:
+          - direction: Horizontal
+            split_size:
+              Percent: 20
+          - direction: Horizontal
+            split_size:
+              Percent: 90
+        split_size:
+          Percent: 80
+      - direction: Vertical
+        split_size:
+          Percent: 20
diff --git a/src/tests/integration/layouts.rs b/src/tests/integration/layouts.rs
index 9781336e..cef96d87 100644
--- a/src/tests/integration/layouts.rs
+++ b/src/tests/integration/layouts.rs
@@ -1,4 +1,5 @@
 use ::insta::assert_snapshot;
+use std::path::PathBuf;
 
 use crate::terminal_pane::PositionAndSize;
 use crate::tests::fakes::FakeInputOutput;
@@ -20,11 +21,11 @@ pub fn accepts_basic_layout() {
     };
     let mut fake_input_output = get_fake_os_input(&fake_win_size);
     fake_input_output.add_terminal_input(&[COMMAND_TOGGLE, COMMAND_TOGGLE, QUIT]);
-    use std::path::PathBuf;
     let mut opts = Opt::default();
     opts.layout = Some(PathBuf::from(
         "src/tests/fixtures/layouts/three-panes-with-nesting.yaml",
     ));
+
     start(Box::new(fake_input_output.clone()), opts);
     let output_frames = fake_input_output
         .stdout_writer
@@ -49,3 +50,43 @@ pub fn accepts_basic_layout() {
     assert_snapshot!(next_to_last_snapshot);
     assert_snapshot!(last_snapshot);
 }
+
+#[test]
+#[should_panic(expected = "The total percent for each part should equal 100.")]
+pub fn should_throw_for_more_than_100_percent_total() {
+    let fake_win_size = PositionAndSize {
+        columns: 121,
+        rows: 20,
+        x: 0,
+        y: 0,
+    };
+    let mut fake_input_output = get_fake_os_input(&fake_win_size);
+    fake_input_output.add_terminal_input(&[QUIT]);
+
+    let mut opts = Opt::default();
+    opts.layout = Some(PathBuf::from(
+        "src/tests/fixtures/layouts/parts-total-more-than-100-percent.yaml",
+    ));
+
+    start(Box::new(fake_input_output.clone()), opts);
+}
+
+#[test]
+#[should_panic(expected = "The total percent for each part should equal 100.")]
+pub fn should_throw_for_less_than_100_percent_total() {
+    let fake_win_size = PositionAndSize {
+        columns: 121,
+        rows: 20,
+        x: 0,
+        y: 0,
+    };
+    let mut fake_input_output = get_fake_os_input(&fake_win_size);
+    fake_input_output.add_terminal_input(&[QUIT]);
+
+    let mut opts = Opt::default();
+    opts.layout = Some(PathBuf::from(
+        "src/tests/fixtures/layouts/parts-total-less-than-100-percent.yaml",
+    ));
+
+    start(Box::new(fake_input_output.clone()), opts);
+}
diff --git a/src/utils/logging.rs b/src/utils/logging.rs
index 77e924a9..38ac57c4 100644
--- a/src/utils/logging.rs
+++ b/src/utils/logging.rs
@@ -38,7 +38,6 @@ pub fn delete_log_dir() -> io::Result<()> {
     if fs::metadata(MOSAIC_TMP_LOG_DIR).is_ok() {
         fs::remove_dir_all(MOSAIC_TMP_LOG_DIR)?;
     }
-    fs::create_dir_all(MOSAIC_TMP_LOG_DIR)?;
 
     Ok(())
 }