grep program

src/bin/grep.lua

@@ -0,0 +1,36 @@
+local pattern, file = ...
+if not pattern then error "At least a pattern is required" end
+if file and not fs.exists(file) then error(("%s does not exist"):format(file)) end
+if not file then file = "." end
+
+local function scan_file(filepath)
+    local filepath = fs.combine(filepath, "")
+    if fs.isDir(filepath) then
+        for _, basename in pairs(fs.list(filepath)) do
+            scan_file(fs.combine(filepath, basename))
+        end
+        return
+    end
+    local fh = fs.open(filepath, "r")
+    local count = 1
+    local has_printed_filename = false
+    while true do
+        local line = fh.readLine()
+        if line == nil then break end
+        if line:match(pattern) then
+            if not has_printed_filename then
+                if term.isColor() then term.setTextColor(colors.blue) end
+                print(filepath)
+            end
+            if term.isColor() then term.setTextColor(colors.lime) end
+            write(tostring(count) .. ": ")
+            if term.isColor() then term.setTextColor(colors.white) end
+            textutils.pagedPrint(line)
+            has_printed_filename = true
+        end
+        count = count + 1
+    end
+    fh.close()
+end
+
+scan_file(file)

src/main.lua

@@ -1223,7 +1223,7 @@ if mfst then
 			verified = ("false %s"):format(tostring(mfst.verification_error))
 		end
 	end
-	print("Signature verified:", verified)
+	print("Signature verified", verified)
 else
 	print "Manifest not found in registry. Extended data unavailable."
 end