add ability to check whether a preview is outdated

4 files changed, 20 insertions, 11 deletions

diff --git a/Cargo.lock b/Cargo.lock
index 295b521..3219db2 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -148,9 +148,9 @@ dependencies = [
 
 [[package]]
 name = "crossbeam-utils"
-version = "0.8.9"
+version = "0.8.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8ff1f980957787286a554052d03c7aee98d99cc32e09f6d45f0a814133c87978"
+checksum = "7d82ee10ce34d7bc12c2122495e7593a9c41347ecdd64185af4ecf72cb1a7f83"
 dependencies = [
  "cfg-if",
  "once_cell",
@@ -893,9 +893,9 @@ checksum = "7bd3e3206899af3f8b12af284fafc038cc1dc2b41d1b89dd17297221c5d225de"
 
 [[package]]
 name = "smallvec"
-version = "1.8.0"
+version = "1.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f2dd574626839106c320a323308629dcb1acfc96e32a8cba364ddc61ac23ee83"
+checksum = "2fd0db749597d91ff862fd1d55ea87f7855a744a8425a64695b6fca237d1dad1"
 
 [[package]]
 name = "str-buf"
@@ -1063,9 +1063,9 @@ checksum = "5bd2fe26506023ed7b5e1e315add59d6f584c621d037f9368fea9cfb988f368c"
 
 [[package]]
 name = "unicode-normalization"
-version = "0.1.19"
+version = "0.1.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d54590932941a9e9266f0832deed84ebe1bf2e4c9e4a3554d393d18f5e854bf9"
+checksum = "81dee68f85cab8cf68dec42158baf3a79a1cdc065a8b103025965d6ccb7f6cbd"
 dependencies = [
  "tinyvec",
 ]
diff --git a/src/config/preview.rs b/src/config/preview.rs
index 7d0b0be..962c273 100644
--- a/src/config/preview.rs
+++ b/src/config/preview.rs
@@ -10,13 +10,13 @@ pub struct JoshutoPreviewEntry {
 }
 
 #[derive(Debug, Default, Deserialize)]
-struct JoshutoPreviewCrude {
+struct JoshutoPreviewRaw {
     pub extension: Option<HashMap<String, JoshutoPreviewEntry>>,
     pub mimetype: Option<HashMap<String, JoshutoPreviewEntry>>,
 }
 
-impl From<JoshutoPreviewCrude> for JoshutoPreview {
-    fn from(crude: JoshutoPreviewCrude) -> Self {
+impl From<JoshutoPreviewRaw> for JoshutoPreview {
+    fn from(crude: JoshutoPreviewRaw) -> Self {
         let extension = crude.extension.unwrap_or_default();
         let mimetype = crude.mimetype.unwrap_or_default();
 
@@ -35,6 +35,6 @@ pub struct JoshutoPreview {
 
 impl TomlConfigFile for JoshutoPreview {
     fn get_config(file_name: &str) -> Self {
-        parse_to_config_file::<JoshutoPreviewCrude, JoshutoPreview>(file_name).unwrap_or_default()
+        parse_to_config_file::<JoshutoPreviewRaw, JoshutoPreview>(file_name).unwrap_or_default()
     }
 }
diff --git a/src/preview/preview_default.rs b/src/preview/preview_default.rs
index 8a216c9..bb5ea64 100644
--- a/src/preview/preview_default.rs
+++ b/src/preview/preview_default.rs
@@ -23,7 +23,12 @@ pub fn load_preview_path(context: &mut AppContext, p: path::PathBuf, metadata: J
         let need_to_load = context
             .preview_context_ref()
             .get_preview_ref(p.as_path())
-            .is_none();
+            .map(|p| {
+                p.as_ref()
+                    .map(|p| p.modified < metadata.modified())
+                    .unwrap_or(true)
+            })
+            .unwrap_or(true);
 
         if need_to_load {
             preview_file::Background::preview_path_with_script(context, p);
diff --git a/src/preview/preview_file.rs b/src/preview/preview_file.rs
index dac3ad2..f929b2e 100644
--- a/src/preview/preview_file.rs
+++ b/src/preview/preview_file.rs
@@ -1,6 +1,7 @@
 use std::path;
 use std::process::{Command, Output};
 use std::thread;
+use std::time;
 
 use crate::context::AppContext;
 use crate::event::AppEvent;
@@ -10,6 +11,7 @@ pub struct FilePreview {
     pub status: std::process::ExitStatus,
     pub output: String,
     pub index: usize,
+    pub modified: time::SystemTime,
 }
 
 impl std::convert::From<Output> for FilePreview {
@@ -17,9 +19,11 @@ impl std::convert::From<Output> for FilePreview {
         let s = String::from_utf8_lossy(&output.stdout).to_string();
         let s2 = s.replace('\t', "        ");
         let status = output.status;
+        let modified = time::SystemTime::now();
         Self {
             status,
             output: s2,
+            modified,
             index: 0,
         }
     }