modify build script for two exercise versions

exercise/build.py

@@ -14,7 +14,7 @@ def clear_tex_binaries():
                 os.remove(file)
 
 
-# build main pdf
+# build main pdf (with solutions)
 clear_tex_binaries()
 with fileinput.input('main.tex', inplace=True) as f:
     for line in f:
@@ -34,6 +34,34 @@ def clear_tex_binaries():
 call(call_pdflatex_l)
 
 
+# go into the parent directory
+os.chdir('..')
+os.makedirs('built', exist_ok=True)
+#take main.pdf from the exercise folder and move it to the parent folder
+os.replace('exercise/main.pdf', os.path.join('built', 'exercise_with_solution.pdf'))
+
+
+# build main pdf (without solutions)
+os.chdir('exercise')
+clear_tex_binaries()
+with fileinput.input('main.tex', inplace=True) as f:
+    for line in f:
+        if 'includeonly{' in line:
+            # comment out includeonly flag
+            print(f'%{line}', end='')
+        #check if the line including '\documentclass' has the parameter 'solution' - if yes remove it
+        elif '{exerciseClass}' in line:
+            if 'solution' in line:
+                print(line.replace(', [solution]{exerciseClass}', '{exerciseClass}'), end='')
+            else:
+                print(line, end='')    
+        else:
+            print(line, end='')
+
+call(call_pdflatex_l)
+call(call_pdflatex_l)
+
+
 # go into the parent directory
 os.chdir('..')
 os.makedirs('built', exist_ok=True)