From 890000bd0e53259f325602dc91ca3a32467a429f Mon Sep 17 00:00:00 2001
From: Manos Pitsidianakis <el13635@mail.ntua.gr>
Date: Sun, 2 Aug 2020 00:48:44 +0300
Subject: [PATCH] status page: trim extension name at 30 chars

NNTP has some long protocol extension names
---
 melib/src/text_processing/mod.rs | 58 ++++++++++++++++++++++++++++++--
 src/components/mail/status.rs    |  8 +++--
 2 files changed, 61 insertions(+), 5 deletions(-)

diff --git a/melib/src/text_processing/mod.rs b/melib/src/text_processing/mod.rs
index 0c2e3de2..ac2e26f6 100644
--- a/melib/src/text_processing/mod.rs
+++ b/melib/src/text_processing/mod.rs
@@ -31,11 +31,46 @@ pub use line_break::*;
 pub use wcwidth::*;
 
 pub trait Truncate {
-    fn truncate_at_boundary(self, new_len: usize);
+    fn truncate_at_boundary(&mut self, new_len: usize);
+    fn trim_at_boundary(&self, new_len: usize) -> &str;
 }
 
-impl Truncate for &mut String {
-    fn truncate_at_boundary(self, new_len: usize) {
+impl Truncate for &str {
+    fn truncate_at_boundary(&mut self, new_len: usize) {
+        if new_len >= self.len() {
+            return;
+        }
+
+        extern crate unicode_segmentation;
+        use unicode_segmentation::UnicodeSegmentation;
+        if let Some((last, _)) = UnicodeSegmentation::grapheme_indices(*self, true)
+            .take(new_len)
+            .last()
+        {
+            *self = &self[..last];
+        }
+    }
+
+    fn trim_at_boundary(&self, new_len: usize) -> &str {
+        if new_len >= self.len() {
+            return self;
+        }
+
+        extern crate unicode_segmentation;
+        use unicode_segmentation::UnicodeSegmentation;
+        if let Some((last, _)) = UnicodeSegmentation::grapheme_indices(*self, true)
+            .take(new_len)
+            .last()
+        {
+            &self[..last]
+        } else {
+            self
+        }
+    }
+}
+
+impl Truncate for String {
+    fn truncate_at_boundary(&mut self, new_len: usize) {
         if new_len >= self.len() {
             return;
         }
@@ -49,6 +84,23 @@ impl Truncate for &mut String {
             String::truncate(self, last);
         }
     }
+
+    fn trim_at_boundary(&self, new_len: usize) -> &str {
+        if new_len >= self.len() {
+            return self;
+        }
+
+        extern crate unicode_segmentation;
+        use unicode_segmentation::UnicodeSegmentation;
+        if let Some((last, _)) = UnicodeSegmentation::grapheme_indices(self.as_str(), true)
+            .take(new_len)
+            .last()
+        {
+            &self[..last]
+        } else {
+            self.as_str()
+        }
+    }
 }
 
 pub trait GlobMatch {
diff --git a/src/components/mail/status.rs b/src/components/mail/status.rs
index dfe3840d..d29e4368 100644
--- a/src/components/mail/status.rs
+++ b/src/components/mail/status.rs
@@ -548,7 +548,11 @@ impl Component for AccountStatus {
             );
             let max_name_width = std::cmp::max(
                 "Server Extensions:".len(),
-                extensions.iter().map(|(n, _)| n.len()).max().unwrap_or(0),
+                extensions
+                    .iter()
+                    .map(|(n, _)| std::cmp::min(30, n.len()))
+                    .max()
+                    .unwrap_or(0),
             );
             write_string_to_grid(
                 "meli support:",
@@ -563,7 +567,7 @@ impl Component for AccountStatus {
             for (i, (name, status)) in extensions.into_iter().enumerate() {
                 let (width, height) = self.content.size();
                 write_string_to_grid(
-                    &name,
+                    name.trim_at_boundary(30),
                     &mut self.content,
                     self.theme_default.fg,
                     self.theme_default.bg,