zsh: functions: add mangrep

functions/misc.zsh

@@ -266,3 +266,21 @@ make_backup() {
 function find_by_mtime() {
     find $@ -printf "%T+ %p\n" | sort
 }
+
+
+function mangrep() {
+    set -x
+    if [[ -z "$@" ]]; then
+        echo "Usage: $0 <pattern> <command>"
+        echo "Opens man page for <command> at the first match for <pattern>"
+        return
+    fi
+    pattern=$1
+    cmd=$2
+    if [[ -z "$cmd" ]]; then
+        man "$cmd"
+        return
+    fi
+
+    MANPAGER="less -p \"$pattern\"" man "$cmd"
+}