1 files changed, 32 insertions, 0 deletions
diff --git a/Lib/grep.py b/Lib/grep.py
new file mode 100644
index 0000000..210f9f0
--- /dev/null
+++ b/Lib/grep.py
@@ -0,0 +1,32 @@
+# 'grep'
+
+import regexp
+import string
+
+def grep(expr, filename):
+	prog = regexp.compile(expr)
+	fp = open(filename, 'r')
+	lineno = 0
+	while 1:
+		line = fp.readline()
+		if not line: break
+		lineno = lineno + 1
+		res = prog.exec(line)
+		if res:
+			#print res
+			start, end = res[0]
+			if line[-1:] = '\n': line = line[:-1]
+			prefix = string.rjust(`lineno`, 3) + ': '
+			print prefix + line
+			if 0:
+				line = line[:start]
+				if '\t' not in line:
+					prefix = ' ' * (len(prefix) + start)
+				else:
+					prefix = ' ' * len(prefix)
+					for c in line:
+						if c <> '\t': c = ' '
+						prefix = prefix + c
+				if start = end: prefix = prefix + '\\'
+				else: prefix = prefix + '^'*(end-start)
+				print prefix