Use TERM_PROGRAM for determining WezTerm terminal

Currently, `TERM` is used, which is not set by default.
swsnr · Jul 14, 2021 · 6246bdb · 6246bdb
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -8,6 +8,11 @@ To publish a new release run `scripts/release` from the project directory.
 
 ## [Unreleased]
 
+### Changed
+- Use `TERM_PROGRAM` for determining WezTerm terminal (see [GH-185]).
+
+[GH-185]: https://github.com/lunaryorn/mdcat/pull/185
+
 ## [0.23.0] – 2021-07-04
 
 ### Added

diff --git a/src/terminal.rs b/src/terminal.rs
@@ -82,7 +82,7 @@ fn get_vte_version() -> Option<(u8, u8)> {
 
 /// Checks if the current terminal is WezTerm.
 fn is_wezterm() -> bool {
-    std::env::var("TERM").map_or(false, |value| value == "wezterm")
+    std::env::var("TERM_PROGRAM").map_or(false, |value| value == "WezTerm")
 }
 
 impl TerminalCapabilities {