Automatic generation of indexes for exercises folder.

source/Makefile

@@ -108,6 +108,10 @@ FIL_TEMPLATES = $(TEMPLATES)filters/
 # Files
 # -------------------------------
 
+
+## Pre-req files
+## (md files generated by other rules)
+
 # UML class diagrams (source and target).
 SOURCE_CLA_TXT_FILES := $(shell find $(CLA_DIR) -mindepth 1  -maxdepth 1 -iname "*.txt")
 TARGET_CLA_MD_FILES := $(addsuffix .md,  $(basename $(SOURCE_CLA_TXT_FILES)))
@@ -116,14 +120,14 @@ TARGET_CLA_TXT_FILES := $(addprefix $(BUILD_DIR), $(SOURCE_CLA_TXT_FILES))
 # Exercises files (with and without solution)
 SOURCE_EXO_W_SOL := $(shell find $(EXO_W_SOL_DIR) -name '*.md')
 TARGET_EXO_WO_SOL := $(subst exercises_w_sol,exercises,$(SOURCE_EXO_W_SOL))
-TARGET_EXO_WO_SOL_WITHOUT_INDEX := $(filter-out index.md %/index.md,$(TARGET_EXO_WO_SOL))
 
 ## md files
+
 # We have two sources, one containing the index.md files,
 # (including at root level), and one that doesn't.
 SOURCE_MD_FILES := $(shell find $(MD_DIRS) -name '*.md')
 SOURCE_MD_FILES += index.md
-SOURCE_MD_FILES += $(TARGET_EXO_WO_SOL_WITHOUT_INDEX)
+SOURCE_MD_FILES += $(TARGET_EXO_WO_SOL)
 # md files without the index.md files in a folder.
 # Those files only contain the title of the folder.
 # cf. https://quartz.jzhao.xyz/authoring-content
@@ -147,6 +151,8 @@ TARGET_DOC_FILES_WITHOUT_INDEX := $(addsuffix .docx, $(basename $(TARGET_MD_FILE
 # Note that we use the order file, discussed below (look for "order").
 SOURCE_BOOK := $(shell cat order | grep -E "./lectures/.*.md|./docs/.*md")
 
+## Other files
+
 # Font files (source and target).
 SOURCE_WOFF_FONT_FILES := $(shell find $(FONT_DIR) -iname "*.woff*")
 TARGET_WOFF_FONT_FILES := $(addprefix $(BUILD_DIR), $(SOURCE_WOFF_FONT_FILES))
@@ -165,7 +171,6 @@ TARGET_PROJECTS_FILES := $(addprefix $(BUILD_DIR), $(addsuffix .zip, $(PROJECTS_
 # File where to get the metadata
 METADATA_FILE = $(TEMPLATES)meta.yaml
 
-
 # ===============================
 # Options and variables
 # ===============================
@@ -308,13 +313,15 @@ $(CLA_DIR)%.md: $(CLA_DIR)%.txt
 
 # Exercise without solution
 .PHONY: EXE
-EXE: $(TARGET_EXO_WO_SOL_WITHOUT_INDEX)
+EXE: $(TARGET_EXO_WO_SOL)
 
 $(EXO_DIR)%.md: $(EXO_W_SOL_DIR)%.md
 	@echo "Creating $@"
 	@mkdir -p $(dir $@) \
 	&& cp $< $@ \
 	&& sed -i '/<details>/,/<\/details>/d' $@ \
+	&& sed -i 's/title: Exercises with solutions/title: Exercises/g' $@ \
+	&& sed -i 's-Exercises \*without\* solutions \[are also available\](\./exercises/)\.-Exercises *with* solutions [are also available](./exercises_w_sol/).-g' $@ \
 	&& sed -i 's/\[x\]/[ ]/g' $@ \
 	&& sed -i 's/ (with solutions)//g' $@ \
 	&& sed -i '1 i\<!--\n\nDO NOT EDIT THIS FILE\n\nEdit $<, and run\nmake $@\ninstead.\n-->\n' $@ \