PROJECT_DIR respected, multilang optional

Makefile

@@ -18,16 +18,17 @@
 # change these to fir your project
 #
 
-# root dir for the project, all other paths relative to PROJECT_DIR (except for OUT_DIR)
-PROJECT_DIR 	= .
+# root dir for the project, all other paths relative to PROJECT_DIR (except for OUT_DIR and DEP_DIR)
+PROJECT_DIR 	= src
 
 # path where final website will be in, this one is not relative to PROJECT_DIR
-OUT_DIR 		= ../quintern-test
+OUT_DIR 		= build
 
 # SOURCE FILES:
-# all SRC_FLS and all files in the SRC_DIRS will be built
+# all SRC_FLS and all files (recursively) in the SRC_DIRS will be built
+# all files in PROJECT_DIR (not recursively) are source files
 SRC_DIRS 		= de en script style
-SRC_FLS 		= rss.xml
+SRC_FLS 		= 
 
 # SOURCE FILES:
 # all RESOURCE_FLS and all files in the RESOURCE_DIRS will be copied to OUT_DIR
@@ -41,7 +42,8 @@ RESOURCE_FLS	=
 # 	foreach lang in LANGS:
 # 		run HTML_PP_CMD with --var lang=lang on file and output to OUT_DIR without the COMMON_DIR prefix, so COMMON_DIR/subdir/file.html -> OUT_DIR/lang/subdir/file.html
 # all non-html files will handled the same way, but without the preprocessor being run on them. They are simply copied
-COMMON_DIR 		= common
+# leave COMMON_DIR empty to disable multi-lang feature
+COMMON_DIR 		= 
 LANGS 			= de en
 
 # PREPROCESSOR
@@ -51,7 +53,7 @@ INCLUDE_DIR 	= include
 
 # ADVANCED
 # the command to run the html preprocessor
-HTML_PP_CMD 	= python3 html_preprocessor.py --exit-on light
+HTML_PP_CMD 	= python3 html-preprocessor --exit-on light
 
 DEP_DIR 		= .dependencies
 
@@ -70,12 +72,14 @@ _RES_DIRS 		= $(addprefix $(PROJECT_DIR)/, $(RESOURCE_DIRS))
 _RES_FLS 		= $(addprefix $(PROJECT_DIR)/, $(RESOURCE_FLS))
 _COMMON_DIR 	= $(addprefix $(PROJECT_DIR)/, $(COMMON_DIR))
 _INCLUDE_DIR 	= $(addprefix $(PROJECT_DIR)/, $(INCLUDE_DIR))
-_DEP_DIR 		= $(addprefix $(PROJECT_DIR)/, $(DEP_DIR))
 
 # NORMAL SRC
 # all SRC_DIRS + all subdirs of each srcdir
-_SRC_SUB_DIRS 	= $(foreach srcdir, $(_SRC_DIRS), $(shell find $(srcdir)/ -type d))
-_SRC_FLS		+= $(foreach srcdir, $(_SRC_DIRS), $(shell find $(srcdir)/ -type f))
+_SRC_SUB_DIRS 	= $(foreach srcdir, $(_SRC_DIRS), $(shell find $(srcdir)/ -type d 2>/dev/null))
+# add files in project dir
+_SRC_FLS		+= $(shell find $(PROJECT_DIR)/ -maxdepth 1 -type f)
+# add files src dirs, recursively
+_SRC_FLS		+= $(foreach srcdir, $(_SRC_DIRS), $(shell find $(srcdir)/ -type f 2>/dev/null))
 # OUT_DIRS 	 	= $(OUT_DIR) $(addprefix $(OUT_DIR)/, $(_SRC_SUB_DIRS))
 OUT_DIRS 		= $(OUT_DIR)/ $(patsubst $(PROJECT_DIR)/%, $(OUT_DIR)/%, $(_SRC_SUB_DIRS))
 # path of the source files after being processed
@@ -83,12 +87,13 @@ OUT_DIRS 		= $(OUT_DIR)/ $(patsubst $(PROJECT_DIR)/%, $(OUT_DIR)/%, $(_SRC_SUB_D
 OUT_FLS 		= $(patsubst $(PROJECT_DIR)/%, $(OUT_DIR)/%, $(_SRC_FLS))
 
 # RESOURCES
-_RES_SUB_DIRS 	= $(foreach srcdir, $(_RES_DIRS), $(shell find $(srcdir)/ -type d))
-_RES_FLS		+= $(foreach srcdir, $(_RES_DIRS), $(shell find $(srcdir)/ -type f))
+_RES_SUB_DIRS 	= $(foreach srcdir, $(_RES_DIRS), $(shell find $(srcdir)/ -type d 2>/dev/null))
+_RES_FLS		+= $(foreach srcdir, $(_RES_DIRS), $(shell find $(srcdir)/ -type f 2>/dev/null))
 RES_OUT_DIRS 	= $(OUT_DIR)/ $(patsubst $(PROJECT_DIR)/%, $(OUT_DIR)/%, $(_RES_SUB_DIRS))
 RES_OUT_FLS 	= $(patsubst $(PROJECT_DIR)/%, $(OUT_DIR)/%, $(_RES_FLS))
 
 # MULTILANG
+ifdef COMMON_DIR
 _ML_SRC_FLS 	= $(shell find $(_COMMON_DIR)/ -type f)	
 _ML_SRC_SUB_DIRS= $(shell find $(_COMMON_DIR)/ -type d)
 # will contain one subdir for each lang, each of which contains every file from ML_SRC_FLS
@@ -96,11 +101,12 @@ ML_OUT_DIR 		= $(OUT_DIR)
 ML_OUT_LANG_DIRS= $(foreach lang, $(LANGS), $(addprefix $(ML_OUT_DIR)/, $(lang)))
 ML_OUT_DIRS		= $(foreach lang, $(LANGS), $(patsubst $(_COMMON_DIR)/%, $(ML_OUT_DIR)/$(lang)/%, $(_ML_SRC_SUB_DIRS)))
 ML_OUT_FLS 		= $(foreach lang, $(LANGS), $(patsubst $(_COMMON_DIR)/%, $(ML_OUT_DIR)/$(lang)/%, $(_ML_SRC_FLS)))
+endif
 
 # needed for creating them
-_DEP_DIRS 		= $(sort $(patsubst $(OUT_DIR)/%, $(_DEP_DIR)/%, $(OUT_DIRS) $(ML_OUT_DIRS)))
+_DEP_DIRS 		= $(sort $(patsubst $(OUT_DIR)/%, $(DEP_DIR)/%, $(OUT_DIRS) $(ML_OUT_DIRS)))
 # needed for reading
-_DEP_FLS 		= $(shell find $(_DEP_DIR) -type f -name '*.d')
+_DEP_FLS 		= $(shell find $(DEP_DIR) -type f -name '*.d' 2>/dev/null)
 
 # PRINTING
 FMT_VAR_SRC		="Variable '\e[1;34m%s\e[0m': \e[0;33m%s\e[0m\n"
@@ -134,43 +140,48 @@ print:
 	@printf $(FMT_VAR_OUT) "OUT_FLS" 		"$(OUT_FLS)"
 	@printf $(FMT_VAR_SRC) "_RES_FLS" 		"$(_RES_FLS)"
 	@printf $(FMT_VAR_OUT) "RES_OUT_FLS" 	"$(RES_OUT_FLS)"
+ifdef COMMON_DIR
 	@printf $(FMT_VAR_SRC) "_ML_SRC_FLS" 	"$(_ML_SRC_FLS)"
 	@printf $(FMT_VAR_OUT) "ML_OUT_FLS" 	"$(ML_OUT_FLS)"
+endif
 	@printf $(FMT_VAR_SRC) "_DEP_FLS" 		"$(_DEP_FLS)"
 	@# @printf $(FMT_VAR_SRC) "y" 		"$(y)"
 
-# MULTILANG RULES
+# DIRECTORIES
 $(sort $(ML_OUT_DIRS) $(_DEP_DIRS) $(RES_OUT_DIRS) $(OUT_DIRS)):
 	@printf $(FMT_DIR) "$@"
 	@mkdir -p $@
 
-# build/ml_tmp/lang/subdir/xyz.html
+# MULTILANG RULES
+ifdef COMMON_DIR
+# $@ is the target to trigger the rule, but all languages have to be built now
 $(foreach out_dir, $(ML_OUT_LANG_DIRS), $(out_dir)/%.html): $(_COMMON_DIR)/%.html | $(ML_OUT_DIRS) $(_DEP_DIRS)
-	@#echo "$$@=$@, $$<=$< $$^=$^"
-	@# \$@=build/ml_tmp/lang/subdir/xyz.html, \$<=common/subdir/xyz.html
-	@lang=`echo $(patsubst $(ML_OUT_DIR)/%, %, $@) | awk -F "/" '{print $$1}'`; \
-	printf $(FMT_OUT_ML_HTML) "$$lang" "$<" "$@"; \
-	$(HTML_PP_CMD) --target "$<" --output "$@" --var include_dir=$(_INCLUDE_DIR) --var lang=$$lang --output-deps "$(patsubst $(OUT_DIR)/%, $(_DEP_DIR)/%.d, $@)";
+	@RAW_TARGET=`echo $@ $(foreach lang, $(LANGS), | sed 's|$(ML_OUT_DIR)/$(lang)/||')`;\
+	for lang in $(LANGS); do \
+		target=$(ML_OUT_DIR)/$$lang/$$RAW_TARGET;\
+		printf $(FMT_OUT_ML_HTML) "$$lang" "$<" "$$target"; \
+		$(HTML_PP_CMD) --input "$<" --output "$$target" --var include_dir=$(_INCLUDE_DIR) --var lang=$$lang --output-deps "`echo $${target}.d | sed 's|$(OUT_DIR)/|$(DEP_DIR)/|'`"; \
+	done
+
 
 # rule for all not html files
 $(foreach out_dir, $(ML_OUT_LANG_DIRS), $(out_dir)/%): $(_COMMON_DIR)/% | $(ML_OUT_DIRS)
 	@lang=`echo $(patsubst $(ML_OUT_DIR)/%, %, $@) | awk -F "/" '{print $$1}'`; \
 	printf $(FMT_OUT_ML_OTHER) "$$lang" "$<" "$@" ; \
 	cp $< $@
+endif
 
 #
 # (NORMAL/RE-)SOURCE RULES
 # 
-
-
-$(OUT_DIR)/%.html: %.html | $(OUT_DIRS) $(_DEP_DIRS)
+$(OUT_DIR)/%.html: $(PROJECT_DIR)/%.html | $(OUT_DIRS) $(_DEP_DIRS)
 	@printf $(FMT_OUT_HTML) "$<" "$@";
-	$(HTML_PP_CMD) --target "$<" --output "$@" --var include_dir=$(_INCLUDE_DIR) --output-deps "$(_DEP_DIR)/$<.d";
+	@$(HTML_PP_CMD) --input "$<" --output "$@" --var include_dir=$(_INCLUDE_DIR) --output-deps "$(subst $(DEP_DIR)/$(PROJECT_DIR), $(DEP_DIR), $(DEP_DIR)/$<.d)";
 	@# remove comments and empty lines. two separate lines bc the substitution might create new empty lines
 	@#awk -i inplace '{FS="" sub(/<!--.*-->/,"")}1' $@
 	@#awk -i inplace '{if (NF != 0) print}' $@
 
-$(OUT_DIR)/%: % | $(OUT_DIRS) $(RES_OUT_DIRS)
+$(OUT_DIR)/%: $(PROJECT_DIR)/% | $(OUT_DIRS) $(RES_OUT_DIRS)
 	@printf $(FMT_OUT_OTHER) "$<" "$@"
 	@cp -r $< $@
 
@@ -185,8 +196,8 @@ stop:
 	killall nginx
 
 clean:
-	-rm $(OUT_FLS) $(ML_OUT_FLS)
-	-rm -r $(_DEP_DIR)
+	-rm $(OUT_FLS) $(ML_OUT_FLS) 2>/dev/null
+	-rm -r $(DEP_DIR) 2>/dev/null
 
 cleaner:
 	-rm -r $(OUT_DIR)

README.md

@@ -11,7 +11,7 @@ refer to the article [on my website](https://quintern.xyz/en/software/buwuma.htm
 # HTML Preprocessor Documentation
 ## Syntax
 ### Commands
-- All commands must be located within a html comment what starts with `<!--` and ends with `-->`.
+- All commands must be located within a html comment that starts with `<!--` and ends with `-->`.
 - Commands start with a `#` character, the command must follow the `#` immediately.
 - Everything after the command until the end of the comment or a newline character are considered the argument of the command.
 
@@ -27,7 +27,7 @@ refer to the article [on my website](https://quintern.xyz/en/software/buwuma.htm
 
 - All commands return a string, which can be empty.
 - If a comment contains a command, the entire comment will replaced with the return value of the command.
-- If there are multiple commands in a command, it will be replaced by all the return values added together.
+- If there are multiple commands in a comment, it will be replaced by all the return values added together.
 
 ### Variables
 - Variable names must only consist of these characters: `a-zA-Z0-9_`
@@ -96,7 +96,7 @@ Any string
 **Return Value**:
 The argument in comment tags
 
-This can be useful in multiline comments that contain other commands: In that case, the comment tags will be removed and each command replaced with
+This can be useful in multi-line comments that contain other commands: In that case, the comment tags will be removed and each command replaced with
 its return value, so if you want to just have commented text in there you can use `#comment` 
 
 ### uncomment
@@ -115,6 +115,29 @@ This can be useful when you want to look at the unprocessed html without variabl
 
 ---
 
+### conditionals
+To turn on or off entire blocks, `if`, `elif` can `else` be used.
+These commands can not be nested and must not appear in multi-line comments.
+Logical and `&&` and logical or `||` can be used to chain conditions.
+If a condition is true, the corresponding block is included while all other blocks are deleted.
+
+**Synopsis**
+```
+<!-- #if #$(var) == value && #$(other_var) == other_value -->
+...
+<!-- #elif #$(var) == value || #$(other_var) != other_value -->
+...
+<!-- #else -->
+...
+<!-- #endif -->
+```
+
+**Argument** Condition for `if` and `elif`, ignored for `else` and `endif`
+
+**Return Value** Empty String
+
+---
+
 ### sidenav
 Manage the generation of a content menu which contains links to all headings in your html that have an id. The menu is called sidenav here.
 An entry is a html heading with a id: `<h1 id=myheading>This heading will be linked in the sidenav</h1>`
@@ -166,7 +189,8 @@ Empty string
 
 ## Pitfalls
 - The `#include` command must not be in the last line of the file
-- The `#include` command can not be in multiline comment if the included file also contains comments
+- The `#include` command can not be in multi-line comment if the included file also contains comments
+- `#if`, `#elif`, `#else` and `#endif` must not be in multi-line comments
 - The maps in `set` must have **at least 2** options
 - If you want to use variables in markdown, you have to escape the `#` with a backslash, so `#$(var)` becomes `\#$(var)`
 - You can not use the `return` command from within the arguments of other commands. Commands are executed in order, so `return` will end up as argument of the first command and thus never be executed

html-preprocessor

@@ -106,6 +106,20 @@ def generate_dependecy_file(filename:str, deps:list[str]):
         s += f"{dep}:\n"
     return line1 #+ "\n" + s
 
+def evaluate_condition(input_string) -> bool:
+    words = re.split(r"(==|!=|&&|\|\|)", input_string.replace(" ", ""))
+    for i in range(len(words)):
+        if words[i] not in ["==", "!=", "&&", "||"]:
+            words[i] = '"' + words[i].replace('"', r'\"') + '"'
+
+    condition = "".join(words).replace("&&", " and ").replace("||", " or ")
+    ptrace(f"> Evaluating condition {condition}")
+    try:
+        return eval(condition)
+    except SyntaxError:
+        error(f"Pythonized condition is invalid: {condition}", level=error_levels["light"])
+        return False
+
 
 
 """
@@ -269,6 +283,13 @@ def cmd_comment(args: str, variables:dict[str, str]={}) -> str:
 def cmd_uncomment(args: str, variables:dict[str, str]={}) -> str:
     return args
 
+def cmd_error(args: str, variables:dict[str, str]={}) -> str:
+    error(f"Encounted 'error' command: {args}", level=error_levels["critical"])
+    return ""
+def cmd_warning(args: str, variables:dict[str, str]={}) -> str:
+    error(f"Encounted 'warning' command: {args}", level=error_levels["light"])
+    return ""
+
 
 command2function:dict[str, Callable[[str, dict[str,str]], str]] = {
     "include":      cmd_include,
@@ -277,107 +298,196 @@ command2function:dict[str, Callable[[str, dict[str,str]], str]] = {
     "default":      cmd_default,
     "comment":      cmd_comment,
     "uncomment":    cmd_uncomment,
-    "sidenav":      Sidenav.cmd_sidenav
+    "sidenav":      Sidenav.cmd_sidenav,
+    "warning":      cmd_warning,
+    "error":        cmd_error,
 }
 
 """
 ************************************************************ PARSING ************************************************************
 """
-def parse_file(file:str, variables:dict[str,str]):
+
+class Parser():
+    def __init__(self, file):
+        self.file = file
+        self.pos: dict[str, int] = {}
+        self.state: dict[str, bool] = {}
+
+    def remove(self, start, stop, ignore_bounds=[]):
+        """remove range [start, stop) of text and update positions"""
+        delete_length = stop - start
+        nl, esl = "\n", "\\n"
+
+        ptrace(f"- Deleting range [{start}, {stop}) of length {delete_length}: '{self.file[start:stop].replace(nl, esl)}'")
+        assert(stop >= start)
+        assert(stop <= len(self.file))
+        self.file = self.file[:start] + self.file[stop:]
+        for k,pos in self.pos.items():
+            if pos >= stop: self.pos[k] -= delete_length
+            elif pos > start and not k in ignore_bounds: error(f"Position {k}={pos} within deleted range [{start},{stop})", level=1)
+
+    def replace(self, start, stop, replacement):
+        assert(stop >= start)
+        assert(stop <= len(self.file))
+        ptrace(f"- Replacing range [{start}, {stop}): '{self.file[start:stop]}' with '{replacement}'")
+        self.file = self.file[:start] + replacement + self.file[stop:]
+        length_difference = stop - start - len(replacement)
+        for k,pos in self.pos.items():
+            if pos >= stop: self.pos[k] -= length_difference
+            elif pos > start: error(f"Position {k}={pos} within replaced range [{start},{stop})", level=1)
+
+    def __getitem__(self, key):
+        return self.file[key]
+
+    def __len__(self):
+        return len(self.file)
+
+
+
+def parse_file(_file:str, variables:dict[str,str]):
+    p = Parser(_file)
     sidenav_include_pos = -1
-    comment_begin = -1
-    remove_comment = False
+    p.pos["cmt_beg"] = -1
+    p.pos["cmt_end"] = -1
+    p.pos["cmd_beg"] = -1
+    p.pos["cmdend"] = -1
+    p.pos["conditional_block_beg"] = -1  # char pos of the first char of the last block, if waiting for elif, else or endif
+    p.state["cmd_in_cmt"] = False
+    p.state["last_condition"] = False  # if the last if condition was true
     i = 0
     # if file.count(COMMENT_BEGIN) != file.count(COMMENT_END):
 
-    while i < len(file):  # at start of new line or end of comment
+    while i < len(p):  # at start of new line or end of comment
+        ptrace(f"Processing at i={i} in line {pos2line(p.file, i)}")
+
         # replace variable usages in the current line
-        line_end = file.find('\n', i)
-        if line_end < 0: line_end = len(file)
-        file = file[:i] + replace_variables(file[i:line_end], variables) + file[line_end:]
-        line_end = file.find('\n', i)
-        if line_end < 0: line_end = len(file)
-        ptrace("Line after replacing variables:", file[i:line_end])
+        p.pos["line_end"] = p.file.find('\n', i)
+        if p.pos["line_end"] < 0: p.pos["line_end"] = len(p)
+        p.replace(i, p.pos["line_end"], replace_variables(p[i:p.pos["line_end"]], variables))
+        ptrace("> Line after replacing variables:", p.file[i:p.pos["line_end"]])
 
         # check if heading for sidenav in line
-        match = re.search(re_sidenav_heading, file[i:line_end])
+        match = re.search(re_sidenav_heading, p[i:p.pos["line_end"]])
         if match:
             Sidenav.addEntry(match.groups()[1], f"#{match.groups()[0]}")
             ptrace("> Found heading with id:", match.groups())
 
-        if comment_begin < 0:  # if not in comment, find next comment
-            comment_begin = file.find(COMMENT_BEGIN, i, line_end)
+        # look for comment
+        if p.pos["cmt_beg"] < 0:  # if not in comment, find next comment
+            p.pos["cmt_beg"] = p.file.find(COMMENT_BEGIN, i, p.pos["line_end"])
             # ptrace(f"i={i}, line_end={line_end}, comment_begin={comment_begin}")
-            if comment_begin < 0:
-                i = line_end + 1
+            if p.pos["cmt_beg"] < 0:
+                i = p.pos["line_end"] + 1
                 continue
             else:
                 # jump to comment_begin
                 old_i = i
-                i = comment_begin + len(COMMENT_BEGIN)  # after comment begin
+                i = p.pos["cmt_beg"] + len(COMMENT_BEGIN)  # after comment begin
                 ptrace(f"> Found comment begin, jumping from pos {old_i} to {i}")
 
-        # if here, i at the character after COMMENT_BEGIN
-        # sanity check
-        tmp_next_begin = file.find(COMMENT_BEGIN, i)
-        if 0 < tmp_next_begin and  tmp_next_begin < file.find(COMMENT_END, i):
-            error(f"Found next comment begin before the comment starting in line {pos2line(file, comment_begin)} is ended! Skipping comment. Comment without proper closing tags: '{file[i:line_end]}'", level=error_levels["light"])
-            comment_begin = -1
-            continue
-        # either at newline (if in multiline comment) or at comment end
-        possible_command_end = line_end
-        comment_end = file.find(COMMENT_END, i, line_end)
-        # ptrace(f"i={i}, line_end={line_end}, comment_begin={comment_begin}, comment_end={comment_end}, line={file[i:line_end]}")
-        if comment_end > 0: possible_command_end = comment_end
-        assert(possible_command_end >= i)
+        # in comment, i at the character after COMMENT_BEGIN
+        p.pos["cmt_end"] = p.file.find(COMMENT_END, i) #, p.pos["line_end"])
+        # sanity checks
+        if p.pos["cmt_end"] < 0:
+            error(f"Comment starting in line {pos2line(p.file, p.pos['cmt_beg'])} is never ended.", level=error_levels["serious"])
+        else:
+            tmp_next_begin = p.file.find(COMMENT_BEGIN, i)
+            if 0 < tmp_next_begin and  tmp_next_begin < p.pos["cmt_end"]:
+                error(f"Found next comment begin before the comment starting in line {pos2line(p.file, p.pos['cmt_beg'])} is ended! Skipping comment. Comment without proper closing tags: '{p.file[i:p.pos['line_end']]}'", level=error_levels["light"])
+                p.pos["cmt_beg"] = -1
+                continue
+
+        # either at newline (if in multiline comment) or at comment end
+        p.pos["cmd_beg"] = i
+        p.pos["cmd_end"] = min(p.pos["line_end"], p.pos["cmt_end"])
+        assert p.pos["cmd_end"] >= i, f"cmd_end={p.pos['cmd_end']}, i={i}, line_end={p.pos['line_end']}, cmt_end={p.pos['cmt_end']}"
+        ptrace(f"> Possible command end: {p.pos['cmd_end']}, possible command: '{p[i:p.pos['cmd_end']]}'")
 
-        ptrace(f"> Possible command end: {possible_command_end}, possible command: {file[i:possible_command_end]}")
         # find commands
-        # pdebug(">>> Line ", file[i:possible_command_end])
-        match = re.fullmatch(re_preprocessor_command, file[i:possible_command_end].strip(" "))
+        match = re.fullmatch(re_preprocessor_command, p[i:p.pos["cmd_end"]].strip(" "))
         if match:  # command comment
-            remove_comment = True
+            p.state["cmd_in_cmt"] = True
             command = match.groups()[0]
             args = match.groups()[1].replace('\t', ' ').strip(' ')
-            ptrace(f"> Found command '{command}' with args '{args}'")
-            if command == "sidenav" and args == "include":  # if args contains anything else this wont work
-                sidenav_include_pos = comment_begin  # remove the comment 
-                insert_str = ""
-            elif command not in command2function:
-                error(f"Invalid command in line {pos2line(file, i)}: {command}", level=error_levels["light"])
-                insert_str = ""
+            pdebug(f"> Found command '{command}' with args '{args}'")
+            # delete from previous block if
+            if command in ["elif", "else", "endif"]:
+                if p.pos["conditional_block_beg"] < 0: error(f"Misplaced '{command}' in line {pos2line(p.file, i)}")
+                if p.state["last_condition"]:
+                    # delete block from here at next endif
+                    p.state["last_condition"] = False
+                else:
+                    # delete block from last condition statement
+                    ptrace(f"> Deleting block from last condition")
+                    p.remove(p.pos["conditional_block_beg"], p.pos["cmt_beg"])
+                    i = p.pos["cmd_beg"]
+                p.pos["conditional_block_beg"] = i
+                if command == "endif":
+                    p.pos["conditional_block_beg"] = -1
+                    p.state["last_condition"] = False
+                    p.state["any_condition"] = False
+            # evaluate ifs
+            if command == "if":
+                p.pos["conditional_block_beg"] = i
+                p.state["last_condition"] = evaluate_condition(args)
+                p.state["any_condition"] = p.state["last_condition"]
+                pdebug(f"> Command {command} condition evaluated to {p.state['last_condition']}")
+                cmd_output = ""
+            elif command =="elif":
+                p.pos["conditional_block_beg"] = i
+                p.state["last_condition"] = evaluate_condition(args) if not p.state["any_condition"] else False
+                if p.state["last_condition"]:
+                    p.state["any_condition"] = True
+                pdebug(f"> Command {command} condition evaluated to {p.state['last_condition']}")
+                cmd_output = ""
+            elif command == "else":
+                p.pos["conditional_block_beg"] = i
+                p.state["last_condition"] = True if not p.state["any_condition"] else False
+                cmd_output = ""
+            elif p.pos["conditional_block_beg"] < 0 or p.state["last_condition"]:
+                if command == "sidenav" and args == "include":  # if args contains anything else this wont work
+                    sidenav_include_pos = p.pos["cmt_beg"]  # remove the comment 
+                    cmd_output = ""
+                elif command == "endif":
+                    cmd_output = ""
+                elif command not in command2function:
+                    error(f"Invalid command in line {pos2line(p.file, i)}: {command}", level=error_levels["light"])
+                    cmd_output = ""
+                else:
+                    cmd_output = command2function[command](args, variables)
             else:
-                insert_str = command2function[command](args, variables)
-            file = file[:i] + insert_str + file[possible_command_end:]
-            # replaced string of length possible_command_end - i with one of length insert_str
-            index_correction = -(possible_command_end - i) + len(insert_str)
-            possible_command_end += index_correction
-            line_end += index_correction
-            comment_end += index_correction
-            ptrace(f"> After command, the line is now '{file[i:possible_command_end]}'")
-            # i += len(insert_str)
+                cmd_output = ""
+            p.replace(i, p.pos["cmd_end"], cmd_output)
+            ptrace(f"> After command, the line is now '{p.file[i:p.pos['line_end']]}'")
 
-        # remove comment if done
-        if possible_command_end == comment_end:
-            remove_newline = 0
-            if file[comment_begin-1] == '\n' and file[comment_end+len(COMMENT_END)] == '\n':  # if the comment consumes the whole file, remove the entire line
-                remove_newline = 1
 
-            if remove_comment:
-                # remove the comment tags, basically uncomment the comment
-                # pdebug(f"Removing comment tags from pos {comment_begin} to {comment_end}")
-                file = file[:comment_begin] + file[comment_begin+len(COMMENT_BEGIN):comment_end] + file[comment_end+len(COMMENT_END)+remove_newline:]
-                possible_command_end -= len(COMMENT_BEGIN)
+        if p.pos["cmd_end"] == p.pos["cmt_end"]:  # reached end of comment
+            if p.state["cmd_in_cmt"]:
+                # remove comment tags if a command was found
+                remove_newline = 0
+                if p[p.pos["cmt_beg"]-1] == '\n' and p[p.pos["cmt_end"]+len(COMMENT_END)] == '\n':  # if the comment consumes the whole line, remove the entire line
+                    remove_newline = 1
+                # remove comment if done
+                ptrace(f"Deleting opening comment tags")
+                p.remove(p.pos["cmt_beg"], p.pos["cmt_beg"] + len(COMMENT_BEGIN))
+                p.remove(p.pos["cmt_end"], p.pos["cmt_end"] + len(COMMENT_END) + remove_newline, ignore_bounds=["cmt_end", "cmd_end", "line_end"])
+                # process the line again, because a command might have inserted new comments
                 i -= len(COMMENT_BEGIN)
-            remove_comment = False
-            comment_begin = -1
+            p.state["cmd_in_cmt"] = False
+            p.pos["cmt_beg"] = -1
+            p.pos["cmt_end"] = -1
+            p.pos["cmd_end"] = -1
         else:  # multiline comment
-            i = line_end + 1
-            ptrace(f"Multiline comment, jumping to next line. char[i]='{file[i]}'")
+            p.pos["cmt_end"] = -1
+            p.pos["cmd_end"] = -1
+            i = p.pos["line_end"] + 1
+            ptrace(f"> Multiline comment, jumping to next line.")
         # i = possible_command_end commented, because if something containing new commands is inserted we need to parse that as well
+
     if sidenav_include_pos >= 0:
-        file = file[:sidenav_include_pos] + Sidenav.generate() + file[sidenav_include_pos:]
-    return file
+        return p.file[:sidenav_include_pos] + Sidenav.generate() + p.file[sidenav_include_pos:]
+    else:
+        return p.file
 
 
 def replace_variables(html:str, variables:dict[str, str]):
@@ -389,7 +499,7 @@ def replace_variables(html:str, variables:dict[str, str]):
         matches.append(match)
     html_list = list(html)
     for match in reversed(matches):
-        pdebug(f"Found variable usage {match.groups()[0]}, match from {match.start()} to {match.end()}")
+        pdebug(f"> Found variable usage {match.groups()[0]}, match from {match.start()} to {match.end()}")
         value = ""
         if match.groups()[0] in variables: value = variables[match.groups()[0]]
         for _ in range(match.start(), match.end()):
@@ -411,9 +521,9 @@ def missing_arg(arg):
 def help():
     helpstring = """Synopsis:
     Inject <inject-file> into <target-file>:
-        python3 html-inect.py --target <target-file> --output <output-file> [OPTIONS]
+        python3 html-inect.py --input <input-file> --output <output-file> [OPTIONS]
     \nCommand line options:
-    --target <file>             path to the target file
+    --input <file>              path to the input file
     --output <file>             output to this file instead of overwriting target
     --inplace                   edit target file in place
     --var <varname>=<value>     set the value of a variable. Can be used multiple times
@@ -433,7 +543,7 @@ if __name__ == "__main__":
     inplace = False
     i = 1
     while i in range(1, len(argv)):
-        if argv[i] == "--target":
+        if argv[i] == "--input":
             if len(argv) > i + 1: target_path = argv[i+1].strip(" ")
             else: missing_arg_val(argv[i])
             i += 1
@@ -468,7 +578,7 @@ if __name__ == "__main__":
             error(f"Invalid argument: {argv[i]}")
         i += 1
     # sanity checks
-    if not target_path: missing_arg("--target")
+    if not target_path: missing_arg("--input")
     if not os.path.isfile(target_path): error(f"Invalid target: {target_path} (does not exist)")
     if inplace: output_path = target_path
     if not output_path: