main: support highlighting paths with specific styles

If there are styles starting with `*.`, consider these "glob matchers"
and style according to the matching glob. This allows users to color
paths matching patterns in any way desired.

Fixes: #605

changelog.md

@@ -5,6 +5,10 @@
   [#942]
 - Highlight redirection targets as paths if possible [#982].
 
+## Highlight paths with matching patterns
+
+When matchers start with `*.`, the are treated as globs to further refine thee
+highlighting of paths [#982].
 
 # Changes in 0.8.0
 

docs/highlighters/main.md

@@ -67,6 +67,11 @@ This highlighter defines the following styles:
 * `arg0` - a command word other than one of those enumerated above (other than a command, precommand, alias, function, or shell builtin command).
 * `default` - everything else
 
+Additionally, styles starting with `*.` may be used to style `path` and
+`redirection` argument matches with a more specific style. For example,
+defining the `*.png` style will apply to any `path` or `redirection` target
+ending with `.png`.
+
 To override one of those styles, change its entry in `ZSH_HIGHLIGHT_STYLES`,
 for example in `~/.zshrc`:
 

highlighters/main/main-highlighter.zsh

@@ -1258,6 +1258,16 @@ _zsh_highlight_main_highlighter_check_path()
     fi
   else
     if [[ -L $expanded_path || -e $expanded_path ]]; then
+      for key in ${(k)ZSH_HIGHLIGHT_STYLES}; do
+        case $key in
+          "*."*) ;;
+          *) continue ;;
+        esac
+        case $arg in
+          *.$key[3,-1]) REPLY=$key ;;
+        esac
+      done
+
       return 0
     fi
   fi