From 634e055b258edd492180fbcfd15664a3f4b7263e Mon Sep 17 00:00:00 2001
From: Francois Michonneau <francois.michonneau@gmail.com>
Date: Fri, 1 Jul 2016 14:08:58 -0400
Subject: [PATCH 1/3] add function knitr_fig_path

---
 bin/chunk-options.R | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/bin/chunk-options.R b/bin/chunk-options.R
index 5836973..d956f60 100644
--- a/bin/chunk-options.R
+++ b/bin/chunk-options.R
@@ -8,6 +8,18 @@ library("knitr")
 
 fix_fig_path <- function(pth) file.path("..", pth)
 
+
+## We set the path for the figures globally below, so if we want to
+## customize it for individual episodes, we can append a prefix to the
+## global path. For instance, if we call knitr_fig_path("01-") in the
+## first episode of the lesson, it will generate the figures in
+## `fig/rmd-01-`
+knitr_fig_path <- function(prefix) {
+    new_path <- paste0(opts_chunk$get("fig.path"),
+                      prefix)
+    opts_chunk$set(fig.path = new_path)
+}
+
 ## We use the rmd- prefix for the figures generated by the lssons so
 ## they can be easily identified and deleted by `make clean-rmd`.  The
 ## working directory when the lessons are generated is the root so the

From fb17830636a349a73491a28b21624bf2c74a10f1 Mon Sep 17 00:00:00 2001
From: Greg Wilson <gvwilson@third-bit.com>
Date: Fri, 1 Jul 2016 14:10:07 -0400
Subject: [PATCH 2/3] Lesson checking parameter handling

---
 bin/lesson_check.py | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/bin/lesson_check.py b/bin/lesson_check.py
index c85661e..aaec64f 100755
--- a/bin/lesson_check.py
+++ b/bin/lesson_check.py
@@ -40,6 +40,9 @@
 # Episode filename pattern.
 P_EPISODE_FILENAME = re.compile(r'/_episodes/(\d\d)-[-\w]+.md$')
 
+# Pattern to match lines ending with whitespace.
+P_TRAILING_WHITESPACE = re.compile(r'\s+$')
+
 # What kinds of blockquotes are allowed?
 KNOWN_BLOCKQUOTES = {
     'callout',
@@ -106,6 +109,7 @@ def parse_args():
     parser = OptionParser()
     parser.add_option('-l', '--linelen',
                       default=False,
+                      action="store_true",
                       dest='line_lengths',
                       help='Check line lengths')
     parser.add_option('-p', '--parser',
@@ -118,6 +122,7 @@ def parse_args():
                       help='source directory')
     parser.add_option('-w', '--whitespace',
                       default=False,
+                      action="store_true",
                       dest='trailing_whitespace',
                       help='Check for trailing whitespace')
 
@@ -263,11 +268,11 @@ def check_trailing_whitespace(self):
         """Check for whitespace at the ends of lines."""
 
         if self.args.trailing_whitespace:
-            trailing = [i for (i, l, n) in self.lines if l.endswidth(' ')]
+            trailing = [i for (i, l, n) in self.lines if P_TRAILING_WHITESPACE.match(l)]
             self.reporter.check(not trailing,
                                 self.filename,
                                 'Line(s) end with whitespace: {0}',
-                                ', '.join([str[i] for i in over]))
+                                ', '.join([str(i) for i in trailing]))
 
 
     def check_blockquote_classes(self):

From 030ac5c0854807db9325810cdc2caa7fc933ab24 Mon Sep 17 00:00:00 2001
From: Greg Wilson <gvwilson@third-bit.com>
Date: Sat, 2 Jul 2016 17:30:22 -0400
Subject: [PATCH 3/3] Looking for missing or superfluous images

---
 bin/lesson_check.py | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/bin/lesson_check.py b/bin/lesson_check.py
index aaec64f..6de7714 100755
--- a/bin/lesson_check.py
+++ b/bin/lesson_check.py
@@ -43,6 +43,9 @@
 # Pattern to match lines ending with whitespace.
 P_TRAILING_WHITESPACE = re.compile(r'\s+$')
 
+# Pattern to match figure references in HTML.
+P_FIGURE_REFS = re.compile(r'<img[^>]+src="([^"]+)"[^>]*>')
+
 # What kinds of blockquotes are allowed?
 KNOWN_BLOCKQUOTES = {
     'callout',
@@ -100,6 +103,7 @@ def main():
     for filename in docs.keys():
         checker = create_checker(args, filename, docs[filename])
         checker.check()
+    check_figures(args.source_dir, args.reporter)
     args.reporter.report()
 
 
@@ -197,6 +201,38 @@ def check_fileset(source_dir, reporter, filenames_present):
                    seen)
 
 
+def check_figures(source_dir, reporter):
+    """Check that all figures are present and referenced."""
+
+    # Get references.
+    try:
+        all_figures_html = os.path.join(source_dir, '_includes', 'all_figures.html')
+        with open(all_figures_html, 'r') as reader:
+            text = reader.read()
+        figures = P_FIGURE_REFS.findall(text)
+        referenced = [os.path.split(f)[1] for f in figures if '/fig/' in f]
+    except FileNotFoundError as e:
+        reporter.add(all_figures_html,
+                     'File not found')
+        return
+
+    # Get actual files.
+    fig_dir_path = os.path.join(source_dir, 'fig')
+    actual = [f for f in os.listdir(fig_dir_path) if not f.startswith('.')]
+
+    # Report differences.
+    unexpected = set(actual) - set(referenced)
+    reporter.check(not unexpected,
+                   None,
+                   'Unexpected image files: {0}',
+                   ', '.join(sorted(unexpected)))
+    missing = set(referenced) - set(actual)
+    reporter.check(not missing,
+                   None,
+                   'Missing image files: {0}',
+                   ', '.join(sorted(missing)))
+
+
 def create_checker(args, filename, info):
     """Create appropriate checker for file."""