Text editor: syntax highlighting + line numbers on by default

The most common use of the text editor seems to be for scripting. Having
line numbers and syntax highlighting enabled by default seems sensible.

Syntax highlighting is now enabled by default, but is automatically
disabled when the datablock has a non-highlighted extension.
Highlighting is enabled for filenames like:
    - Text
    - Text.001
    - somefile.py
and is automatically disabled when the datablock has an extension for
which Blender has no syntax highlighter registered.

Reviewers: billreynish, campbellbarton

Subscribers: brecht, billreynish

Differential Revision: https://developer.blender.org/D5472

1 files changed, 18 insertions, 0 deletions

diff --git a/source/blender/blenlib/intern/path_util.c b/source/blender/blenlib/intern/path_util.c
index 111b530a527..18acbca00a1 100644
--- a/source/blender/blenlib/intern/path_util.c
+++ b/source/blender/blenlib/intern/path_util.c
@@ -1685,6 +1685,24 @@ void BLI_split_file_part(const char *string, char *file, const size_t filelen)
 }
 
 /**
+ * Returns a pointer to the last extension (e.g. the position of the last period).
+ * Returns NULL if there is no extension.
+ */
+const char *BLI_path_extension(const char *filepath)
+{
+  const char *extension = strrchr(filepath, '.');
+  if (extension == NULL) {
+    return NULL;
+  }
+  if (BLI_first_slash(extension) != NULL) {
+    /* There is a path separator in the extension, so the '.' was found in a
+     * directory component and not in the filename. */
+    return NULL;
+  }
+  return extension;
+}
+
+/**
  * Append a filename to a dir, ensuring slash separates.
  */
 void BLI_path_append(char *__restrict dst, const size_t maxlen, const char *__restrict file)