[OE-core] [PATCH v4 2/4] devtool: function to replace strings inside a text file

[leonardo.sandoval.gonzalez at linux.intel.com]

From: Leonardo Sandoval <leonardo.sandoval.gonzalez at linux.intel.com>

Signed-off-by: Leonardo Sandoval <leonardo.sandoval.gonzalez at linux.intel.com>
---
 scripts/lib/devtool/__init__.py | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/scripts/lib/devtool/__init__.py b/scripts/lib/devtool/__init__.py
index 29c4c05071..7f4f817a8e 100644
--- a/scripts/lib/devtool/__init__.py
+++ b/scripts/lib/devtool/__init__.py
@@ -292,3 +292,40 @@ def ensure_npm(config, basepath, fixed_setup=False, check_exists=True):
                 raise DevtoolError(msg)
             else:
                 raise
+
+def replace_from_file(path, old, new):
+    """Replace strings on a file"""
+
+    def read_file(path):
+        data = None
+        with open(path) as f:
+            data = f.read()
+        return data
+
+    def write_file(path, data):
+        if data is None:
+            return
+        wdata = data.rstrip() + "\n"
+        with open(path, "w") as f:
+            f.write(wdata)
+
+    # In case old is None, return immediately
+    if old is None:
+        return
+    try:
+        rdata = read_file(path)
+    except IOError as e:
+        # if file does not exit, just quit, otherwise raise an exception
+        if e.errno == errno.ENOENT:
+            return
+        else:
+            raise
+
+    old_contents = rdata.splitlines()
+    new_contents = []
+    for old_content in old_contents:
+        try:
+            new_contents.append(old_content.replace(old, new))
+        except ValueError:
+            pass
+    write_file(path, "\n".join(new_contents))
-- 
2.12.0