fix(install): copy files over only when needed

termux/install_termux.fish

@@ -9,24 +9,41 @@ set -l cache_dir "$HOME/.cache/installer"
 mkdir -p {$cache_dir}/font
 
 set -l font_url "https://github.com/ryanoasis/nerd-fonts/releases/download/v3.2.1/Recursive.zip"
+set -l font_fn "RecMonoCasualNerdFontMono-Regular.ttf"
 
 check_install curl curl
 
 if test -f {$termux_dir}/termux.properties
-    backup_file "$termux_dir/termux.properties" "$backup_dir/termux-$(date +'%s').properties"
+    set -l existing_tprop_sha (shafile {$termux_dir}/termux.properties)
+    set -l tprop_sha (shafile {$current_dir}/termux.properties)
+
+    if test {$existing_tprop_sha} = {$tprop_sha}
+        info "Properties file up to date"
+    else
+        backup_file {$termux_dir}/termux.properties {$backup_dir}/termux-(date +'%s').properties
+        info "Copying termux properties"
+        cp {$current_dir}/termux.properties {$termux_dir}/termux.properties
+    end
+else
+    info "Copying termux properties"
+    cp {$current_dir}/termux.properties {$termux_dir}/termux.properties
 end
 
-info "Copying termux properties"
-cp {$current_dir}/termux.properties "$termux_dir/termux.properties"
-
 info "Downloading font"
-curl -sL "$font_url" -o "$cache_dir/font.zip"
+curl -sL {$font_url} -o {$cache_dir}/font.zip
 
 info "Unpacking font"
-unzip -qq -o -x "$cache_dir/font.zip" -d "$cache_dir/font/"
+unzip -qq -o -x {$cache_dir}/font.zip -d {$cache_dir}/font/
+
+set -l tf_sha (shafile {$termux_dir}/font.ttf)
+set -l newtf_sha (shafile {$cache_dir}/font/{$font_fn})
 
-info "Copying patched font"
-cp {$cache_dir}/font/RecMonoCasualNerdFontMono-Regular.ttf {$termux_dir}/font.ttf
+if test {$tf_sha} = {$newtf_sha}
+    info "Already using latest font version"
+else
+    info "Copying patched font"
+    cp {$cache_dir}/font/{$font_fn} {$termux_dir}/font.ttf
+end
 
 info "Cleaning cache folder"
 rm -rf {$cache_dir}/font/*