From c4402a9e59721172395d9403cfbe467209bcd6ad Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@openwrt.org>
Date: Fri, 20 Aug 2010 14:59:27 +0200
Subject: [PATCH] uci_history -> uci_delta

---
 Makefile             |  2 +-
 cli.c                |  8 ++---
 history.c => delta.c | 76 ++++++++++++++++++++++----------------------
 file.c               | 18 +++++------
 libuci.c             |  8 ++---
 list.c               | 42 ++++++++++++------------
 lua/uci.c            | 16 +++++-----
 uci.h                | 40 +++++++++++------------
 uci_internal.h       |  6 ++--
 9 files changed, 108 insertions(+), 108 deletions(-)
 rename history.c => delta.c (80%)

diff --git a/Makefile b/Makefile
index b00aac8..9f5b313 100644
--- a/Makefile
+++ b/Makefile
@@ -23,7 +23,7 @@ SOURCES = libuci.c file.c ucimap.c util.c
 
 all: uci libuci.$(SHLIB_EXT) uci-static ucimap-example
 
-$(eval $(call add_dep,libuci,history.c list.c uci.h uci_config.h uci_internal.h))
+$(eval $(call add_dep,libuci,delta.c list.c uci.h uci_config.h uci_internal.h))
 $(eval $(call add_dep,ucimap,uci.h uci_config.h ucimap.h))
 
 cli.o: cli.c uci.h uci_config.h
diff --git a/cli.c b/cli.c
index 7bef7a9..0e98aa7 100644
--- a/cli.c
+++ b/cli.c
@@ -224,8 +224,8 @@ static void uci_show_changes(struct uci_package *p)
 {
 	struct uci_element *e;
 
-	uci_foreach_element(&p->saved_history, e) {
-		struct uci_history *h = uci_to_history(e);
+	uci_foreach_element(&p->saved_delta, e) {
+		struct uci_delta *h = uci_to_delta(e);
 		char *prefix = "";
 		char *op = "=";
 
@@ -653,10 +653,10 @@ int main(int argc, char **argv)
 				ctx->flags &= ~UCI_FLAG_EXPORT_NAME;
 				break;
 			case 'p':
-				uci_add_history_path(ctx, optarg);
+				uci_add_delta_path(ctx, optarg);
 				break;
 			case 'P':
-				uci_add_history_path(ctx, ctx->savedir);
+				uci_add_delta_path(ctx, ctx->savedir);
 				uci_set_savedir(ctx, optarg);
 				flags |= CLI_FLAG_NOCOMMIT;
 				break;
diff --git a/history.c b/delta.c
similarity index 80%
rename from history.c
rename to delta.c
index 649ead1..e0fa1b1 100644
--- a/history.c
+++ b/delta.c
@@ -13,7 +13,7 @@
  */
 
 /*
- * This file contains the code for handling uci config history files
+ * This file contains the code for handling uci config delta files
  */
 
 #define _GNU_SOURCE
@@ -28,16 +28,16 @@
 
 /* record a change that was done to a package */
 void
-uci_add_history(struct uci_context *ctx, struct uci_list *list, int cmd, const char *section, const char *option, const char *value)
+uci_add_delta(struct uci_context *ctx, struct uci_list *list, int cmd, const char *section, const char *option, const char *value)
 {
-	struct uci_history *h;
+	struct uci_delta *h;
 	int size = strlen(section) + 1;
 	char *ptr;
 
 	if (value)
 		size += strlen(value) + 1;
 
-	h = uci_alloc_element(ctx, history, option, size);
+	h = uci_alloc_element(ctx, delta, option, size);
 	ptr = uci_dataptr(h);
 	h->cmd = cmd;
 	h->section = strcpy(ptr, section);
@@ -49,7 +49,7 @@ uci_add_history(struct uci_context *ctx, struct uci_list *list, int cmd, const c
 }
 
 void
-uci_free_history(struct uci_history *h)
+uci_free_delta(struct uci_delta *h)
 {
 	if (!h)
 		return;
@@ -76,19 +76,19 @@ int uci_set_savedir(struct uci_context *ctx, const char *dir)
 	return 0;
 }
 
-int uci_add_history_path(struct uci_context *ctx, const char *dir)
+int uci_add_delta_path(struct uci_context *ctx, const char *dir)
 {
 	struct uci_element *e;
 
 	UCI_HANDLE_ERR(ctx);
 	UCI_ASSERT(ctx, dir != NULL);
 	e = uci_alloc_generic(ctx, UCI_TYPE_PATH, dir, sizeof(struct uci_element));
-	uci_list_add(&ctx->history_path, &e->list);
+	uci_list_add(&ctx->delta_path, &e->list);
 
 	return 0;
 }
 
-static inline int uci_parse_history_tuple(struct uci_context *ctx, char **buf, struct uci_ptr *ptr)
+static inline int uci_parse_delta_tuple(struct uci_context *ctx, char **buf, struct uci_ptr *ptr)
 {
 	int c = UCI_CMD_CHANGE;
 
@@ -142,18 +142,18 @@ error:
 	return 0;
 }
 
-static void uci_parse_history_line(struct uci_context *ctx, struct uci_package *p, char *buf)
+static void uci_parse_delta_line(struct uci_context *ctx, struct uci_package *p, char *buf)
 {
 	struct uci_element *e = NULL;
 	struct uci_ptr ptr;
 	int cmd;
 
-	cmd = uci_parse_history_tuple(ctx, &buf, &ptr);
+	cmd = uci_parse_delta_tuple(ctx, &buf, &ptr);
 	if (strcmp(ptr.package, p->e.name) != 0)
 		goto error;
 
-	if (ctx->flags & UCI_FLAG_SAVED_HISTORY)
-		uci_add_history(ctx, &p->saved_history, cmd, ptr.section, ptr.option, ptr.value);
+	if (ctx->flags & UCI_FLAG_SAVED_DELTA)
+		uci_add_delta(ctx, &p->saved_delta, cmd, ptr.section, ptr.option, ptr.value);
 
 	switch(cmd) {
 	case UCI_CMD_REORDER:
@@ -185,7 +185,7 @@ error:
 }
 
 /* returns the number of changes that were successfully parsed */
-static int uci_parse_history(struct uci_context *ctx, FILE *stream, struct uci_package *p)
+static int uci_parse_delta(struct uci_context *ctx, FILE *stream, struct uci_package *p)
 {
 	struct uci_parse_context *pctx;
 	int changes = 0;
@@ -204,10 +204,10 @@ static int uci_parse_history(struct uci_context *ctx, FILE *stream, struct uci_p
 
 		/*
 		 * ignore parse errors in single lines, we want to preserve as much
-		 * history as possible
+		 * delta as possible
 		 */
 		UCI_TRAP_SAVE(ctx, error);
-		uci_parse_history_line(ctx, p, pctx->buf);
+		uci_parse_delta_line(ctx, p, pctx->buf);
 		UCI_TRAP_RESTORE(ctx);
 		changes++;
 error:
@@ -220,7 +220,7 @@ error:
 }
 
 /* returns the number of changes that were successfully parsed */
-static int uci_load_history_file(struct uci_context *ctx, struct uci_package *p, char *filename, FILE **f, bool flush)
+static int uci_load_delta_file(struct uci_context *ctx, struct uci_package *p, char *filename, FILE **f, bool flush)
 {
 	FILE *stream = NULL;
 	int changes = 0;
@@ -228,7 +228,7 @@ static int uci_load_history_file(struct uci_context *ctx, struct uci_package *p,
 	UCI_TRAP_SAVE(ctx, done);
 	stream = uci_open_stream(ctx, filename, SEEK_SET, flush, false);
 	if (p)
-		changes = uci_parse_history(ctx, stream, p);
+		changes = uci_parse_delta(ctx, stream, p);
 	UCI_TRAP_RESTORE(ctx);
 done:
 	if (f)
@@ -239,28 +239,28 @@ done:
 }
 
 /* returns the number of changes that were successfully parsed */
-__private int uci_load_history(struct uci_context *ctx, struct uci_package *p, bool flush)
+__private int uci_load_delta(struct uci_context *ctx, struct uci_package *p, bool flush)
 {
 	struct uci_element *e;
 	char *filename = NULL;
 	FILE *f = NULL;
 	int changes = 0;
 
-	if (!p->has_history)
+	if (!p->has_delta)
 		return 0;
 
-	uci_foreach_element(&ctx->history_path, e) {
+	uci_foreach_element(&ctx->delta_path, e) {
 		if ((asprintf(&filename, "%s/%s", e->name, p->e.name) < 0) || !filename)
 			UCI_THROW(ctx, UCI_ERR_MEM);
 
-		uci_load_history_file(ctx, p, filename, NULL, false);
+		uci_load_delta_file(ctx, p, filename, NULL, false);
 		free(filename);
 	}
 
 	if ((asprintf(&filename, "%s/%s", ctx->savedir, p->e.name) < 0) || !filename)
 		UCI_THROW(ctx, UCI_ERR_MEM);
 
-	changes = uci_load_history_file(ctx, p, filename, &f, flush);
+	changes = uci_load_delta_file(ctx, p, filename, &f, flush);
 	if (flush && f && (changes > 0)) {
 		rewind(f);
 		if (ftruncate(fileno(f), 0) < 0) {
@@ -275,7 +275,7 @@ __private int uci_load_history(struct uci_context *ctx, struct uci_package *p, b
 	return changes;
 }
 
-static void uci_filter_history(struct uci_context *ctx, const char *name, const char *section, const char *option)
+static void uci_filter_delta(struct uci_context *ctx, const char *name, const char *section, const char *option)
 {
 	struct uci_parse_context *pctx;
 	struct uci_element *e, *tmp;
@@ -304,12 +304,12 @@ static void uci_filter_history(struct uci_context *ctx, const char *name, const
 			continue;
 
 		/* NB: need to allocate the element before the call to 
-		 * uci_parse_history_tuple, otherwise the original string 
+		 * uci_parse_delta_tuple, otherwise the original string 
 		 * gets modified before it is saved */
-		e = uci_alloc_generic(ctx, UCI_TYPE_HISTORY, pctx->buf, sizeof(struct uci_element));
+		e = uci_alloc_generic(ctx, UCI_TYPE_DELTA, pctx->buf, sizeof(struct uci_element));
 		uci_list_add(&list, &e->list);
 
-		uci_parse_history_tuple(ctx, &buf, &ptr);
+		uci_parse_delta_tuple(ctx, &buf, &ptr);
 		if (section) {
 			if (!ptr.section || (strcmp(section, ptr.section) != 0))
 				continue;
@@ -322,7 +322,7 @@ static void uci_filter_history(struct uci_context *ctx, const char *name, const
 		uci_free_element(e);
 	}
 
-	/* rebuild the history file */
+	/* rebuild the delta file */
 	rewind(f);
 	if (ftruncate(fileno(f), 0) < 0)
 		UCI_THROW(ctx, UCI_ERR_IO);
@@ -350,13 +350,13 @@ int uci_revert(struct uci_context *ctx, struct uci_ptr *ptr)
 
 	UCI_HANDLE_ERR(ctx);
 	expand_ptr(ctx, ptr, false);
-	UCI_ASSERT(ctx, ptr->p->has_history);
+	UCI_ASSERT(ctx, ptr->p->has_delta);
 
 	/* 
 	 * - flush unwritten changes
 	 * - save the package name
 	 * - unload the package
-	 * - filter the history
+	 * - filter the delta
 	 * - reload the package
 	 */
 	UCI_TRAP_SAVE(ctx, error);
@@ -371,7 +371,7 @@ int uci_revert(struct uci_context *ctx, struct uci_ptr *ptr)
 		option = uci_strdup(ctx, ptr->option);
 
 	uci_free_package(&ptr->p);
-	uci_filter_history(ctx, package, section, option);
+	uci_filter_delta(ctx, package, section, option);
 
 	UCI_INTERNAL(uci_load, ctx, package, &ptr->p);
 	UCI_TRAP_RESTORE(ctx);
@@ -401,14 +401,14 @@ int uci_save(struct uci_context *ctx, struct uci_package *p)
 
 	/* 
 	 * if the config file was outside of the /etc/config path,
-	 * don't save the history to a file, update the real file
+	 * don't save the delta to a file, update the real file
 	 * directly.
 	 * does not modify the uci_package pointer
 	 */
-	if (!p->has_history)
+	if (!p->has_delta)
 		return uci_commit(ctx, &p, false);
 
-	if (uci_list_empty(&p->history))
+	if (uci_list_empty(&p->delta))
 		return 0;
 
 	if (stat(ctx->savedir, &statbuf) < 0)
@@ -425,8 +425,8 @@ int uci_save(struct uci_context *ctx, struct uci_package *p)
 		if (!hook->ops->set)
 			continue;
 
-		uci_foreach_element(&p->history, e) {
-			hook->ops->set(hook->ops, p, uci_to_history(e));
+		uci_foreach_element(&p->delta, e) {
+			hook->ops->set(hook->ops, p, uci_to_delta(e));
 		}
 	}
 
@@ -435,8 +435,8 @@ int uci_save(struct uci_context *ctx, struct uci_package *p)
 	f = uci_open_stream(ctx, filename, SEEK_END, true, true);
 	UCI_TRAP_RESTORE(ctx);
 
-	uci_foreach_element_safe(&p->history, tmp, e) {
-		struct uci_history *h = uci_to_history(e);
+	uci_foreach_element_safe(&p->delta, tmp, e) {
+		struct uci_delta *h = uci_to_delta(e);
 		char *prefix = "";
 
 		switch(h->cmd) {
@@ -467,7 +467,7 @@ int uci_save(struct uci_context *ctx, struct uci_package *p)
 			fprintf(f, "\n");
 		else
 			fprintf(f, "=%s\n", h->value);
-		uci_free_history(h);
+		uci_free_delta(h);
 	}
 
 done:
diff --git a/file.c b/file.c
index 33ba93c..0120505 100644
--- a/file.c
+++ b/file.c
@@ -694,14 +694,14 @@ void uci_file_commit(struct uci_context *ctx, struct uci_package **package, bool
 	/* open the config file for writing now, so that it is locked */
 	f = uci_open_stream(ctx, p->path, SEEK_SET, true, true);
 
-	/* flush unsaved changes and reload from history file */
+	/* flush unsaved changes and reload from delta file */
 	UCI_TRAP_SAVE(ctx, done);
-	if (p->has_history) {
+	if (p->has_delta) {
 		if (!overwrite) {
 			name = uci_strdup(ctx, p->e.name);
 			path = uci_strdup(ctx, p->path);
-			/* dump our own changes to the history file */
-			if (!uci_list_empty(&p->history))
+			/* dump our own changes to the delta file */
+			if (!uci_list_empty(&p->delta))
 				UCI_INTERNAL(uci_save, ctx, p);
 
 			/* 
@@ -713,15 +713,15 @@ void uci_file_commit(struct uci_context *ctx, struct uci_package **package, bool
 			UCI_INTERNAL(uci_import, ctx, f, name, &p, true);
 
 			p->path = path;
-			p->has_history = true;
+			p->has_delta = true;
 			*package = p;
 
 			/* freed together with the uci_package */
 			path = NULL;
 		}
 
-		/* flush history */
-		if (!uci_load_history(ctx, p, true))
+		/* flush delta */
+		if (!uci_load_delta(ctx, p, true))
 			goto done;
 	}
 
@@ -841,8 +841,8 @@ static struct uci_package *uci_file_load(struct uci_context *ctx, const char *na
 
 	if (package) {
 		package->path = filename;
-		package->has_history = confdir;
-		uci_load_history(ctx, package, false);
+		package->has_delta = confdir;
+		uci_load_delta(ctx, package, false);
 	}
 
 done:
diff --git a/libuci.c b/libuci.c
index 5b22ef1..1a09fc7 100644
--- a/libuci.c
+++ b/libuci.c
@@ -44,7 +44,7 @@ static void uci_unload_plugin(struct uci_context *ctx, struct uci_plugin *p);
 
 #include "uci_internal.h"
 #include "list.c"
-#include "history.c"
+#include "delta.c"
 
 /* exported functions */
 struct uci_context *uci_alloc_context(void)
@@ -57,11 +57,11 @@ struct uci_context *uci_alloc_context(void)
 
 	memset(ctx, 0, sizeof(struct uci_context));
 	uci_list_init(&ctx->root);
-	uci_list_init(&ctx->history_path);
+	uci_list_init(&ctx->delta_path);
 	uci_list_init(&ctx->backends);
 	uci_list_init(&ctx->hooks);
 	uci_list_init(&ctx->plugins);
-	ctx->flags = UCI_FLAG_STRICT | UCI_FLAG_SAVED_HISTORY;
+	ctx->flags = UCI_FLAG_STRICT | UCI_FLAG_SAVED_DELTA;
 
 	ctx->confdir = (char *) uci_confdir;
 	ctx->savedir = (char *) uci_savedir;
@@ -87,7 +87,7 @@ void uci_free_context(struct uci_context *ctx)
 		struct uci_package *p = uci_to_package(e);
 		uci_free_package(&p);
 	}
-	uci_foreach_element_safe(&ctx->history_path, tmp, e) {
+	uci_foreach_element_safe(&ctx->delta_path, tmp, e) {
 		uci_free_element(e);
 	}
 	UCI_TRAP_RESTORE(ctx);
diff --git a/list.c b/list.c
index 1a080fa..cee1063 100644
--- a/list.c
+++ b/list.c
@@ -224,8 +224,8 @@ uci_alloc_package(struct uci_context *ctx, const char *name)
 	p = uci_alloc_element(ctx, package, name, 0);
 	p->ctx = ctx;
 	uci_list_init(&p->sections);
-	uci_list_init(&p->history);
-	uci_list_init(&p->saved_history);
+	uci_list_init(&p->delta);
+	uci_list_init(&p->saved_delta);
 	return p;
 }
 
@@ -243,11 +243,11 @@ uci_free_package(struct uci_package **package)
 	uci_foreach_element_safe(&p->sections, tmp, e) {
 		uci_free_section(uci_to_section(e));
 	}
-	uci_foreach_element_safe(&p->history, tmp, e) {
-		uci_free_history(uci_to_history(e));
+	uci_foreach_element_safe(&p->delta, tmp, e) {
+		uci_free_delta(uci_to_delta(e));
 	}
-	uci_foreach_element_safe(&p->saved_history, tmp, e) {
-		uci_free_history(uci_to_history(e));
+	uci_foreach_element_safe(&p->saved_delta, tmp, e) {
+		uci_free_delta(uci_to_delta(e));
 	}
 	uci_free_element(&p->e);
 	*package = NULL;
@@ -452,8 +452,8 @@ static void uci_add_element_list(struct uci_context *ctx, struct uci_ptr *ptr, b
 	struct uci_package *p;
 
 	p = ptr->p;
-	if (!internal && p->has_history)
-		uci_add_history(ctx, &p->history, UCI_CMD_LIST_ADD, ptr->section, ptr->option, ptr->value);
+	if (!internal && p->has_delta)
+		uci_add_delta(ctx, &p->delta, UCI_CMD_LIST_ADD, ptr->section, ptr->option, ptr->value);
 
 	e = uci_alloc_generic(ctx, UCI_TYPE_ITEM, ptr->value, sizeof(struct uci_option));
 	uci_list_add(&ptr->o->v.list, &e->list);
@@ -461,7 +461,7 @@ static void uci_add_element_list(struct uci_context *ctx, struct uci_ptr *ptr, b
 
 int uci_rename(struct uci_context *ctx, struct uci_ptr *ptr)
 {
-	/* NB: UCI_INTERNAL use means without history tracking */
+	/* NB: UCI_INTERNAL use means without delta tracking */
 	bool internal = ctx->internal;
 	struct uci_element *e;
 	struct uci_package *p;
@@ -475,8 +475,8 @@ int uci_rename(struct uci_context *ctx, struct uci_ptr *ptr)
 	UCI_ASSERT(ctx, ptr->s);
 	UCI_ASSERT(ctx, ptr->value);
 
-	if (!internal && p->has_history)
-		uci_add_history(ctx, &p->history, UCI_CMD_RENAME, ptr->section, ptr->option, ptr->value);
+	if (!internal && p->has_delta)
+		uci_add_delta(ctx, &p->delta, UCI_CMD_RENAME, ptr->section, ptr->option, ptr->value);
 
 	n = uci_strdup(ctx, ptr->value);
 	if (e->name)
@@ -497,9 +497,9 @@ int uci_reorder_section(struct uci_context *ctx, struct uci_section *s, int pos)
 	UCI_HANDLE_ERR(ctx);
 
 	uci_list_set_pos(&s->package->sections, &s->e.list, pos);
-	if (!ctx->internal && p->has_history) {
+	if (!ctx->internal && p->has_delta) {
 		sprintf(order, "%d", pos);
-		uci_add_history(ctx, &p->history, UCI_CMD_REORDER, s->e.name, NULL, order);
+		uci_add_delta(ctx, &p->delta, UCI_CMD_REORDER, s->e.name, NULL, order);
 	}
 
 	return 0;
@@ -515,8 +515,8 @@ int uci_add_section(struct uci_context *ctx, struct uci_package *p, const char *
 	s = uci_alloc_section(p, type, NULL);
 	uci_fixup_section(ctx, s);
 	*res = s;
-	if (!internal && p->has_history)
-		uci_add_history(ctx, &p->history, UCI_CMD_ADD, s->e.name, NULL, type);
+	if (!internal && p->has_delta)
+		uci_add_delta(ctx, &p->delta, UCI_CMD_ADD, s->e.name, NULL, type);
 
 	return 0;
 }
@@ -535,8 +535,8 @@ int uci_delete(struct uci_context *ctx, struct uci_ptr *ptr)
 
 	UCI_ASSERT(ctx, ptr->s);
 
-	if (!internal && p->has_history)
-		uci_add_history(ctx, &p->history, UCI_CMD_REMOVE, ptr->section, ptr->option, NULL);
+	if (!internal && p->has_delta)
+		uci_add_delta(ctx, &p->delta, UCI_CMD_REMOVE, ptr->section, ptr->option, NULL);
 
 	uci_free_any(&e);
 
@@ -550,7 +550,7 @@ int uci_delete(struct uci_context *ctx, struct uci_ptr *ptr)
 
 int uci_add_list(struct uci_context *ctx, struct uci_ptr *ptr)
 {
-	/* NB: UCI_INTERNAL use means without history tracking */
+	/* NB: UCI_INTERNAL use means without delta tracking */
 	bool internal = ctx->internal;
 	struct uci_option *prev = NULL;
 	const char *value2 = NULL;
@@ -591,7 +591,7 @@ int uci_add_list(struct uci_context *ctx, struct uci_ptr *ptr)
 
 int uci_set(struct uci_context *ctx, struct uci_ptr *ptr)
 {
-	/* NB: UCI_INTERNAL use means without history tracking */
+	/* NB: UCI_INTERNAL use means without delta tracking */
 	bool internal = ctx->internal;
 
 	UCI_HANDLE_ERR(ctx);
@@ -644,8 +644,8 @@ int uci_set(struct uci_context *ctx, struct uci_ptr *ptr)
 		UCI_THROW(ctx, UCI_ERR_INVAL);
 	}
 
-	if (!internal && ptr->p->has_history)
-		uci_add_history(ctx, &ptr->p->history, UCI_CMD_CHANGE, ptr->section, ptr->option, ptr->value);
+	if (!internal && ptr->p->has_delta)
+		uci_add_delta(ctx, &ptr->p->delta, UCI_CMD_CHANGE, ptr->section, ptr->option, ptr->value);
 
 	return 0;
 }
diff --git a/lua/uci.c b/lua/uci.c
index b355420..efa8c1a 100644
--- a/lua/uci.c
+++ b/lua/uci.c
@@ -689,10 +689,10 @@ uci_lua_revert(lua_State *L)
 static void
 uci_lua_add_change(lua_State *L, struct uci_element *e)
 {
-	struct uci_history *h;
+	struct uci_delta *h;
 	const char *name;
 
-	h = uci_to_history(e);
+	h = uci_to_delta(e);
 	if (!h->section)
 		return;
 
@@ -728,14 +728,14 @@ uci_lua_changes_pkg(lua_State *L, struct uci_context *ctx, const char *package)
 			return;
 	}
 
-	if (uci_list_empty(&p->history) && uci_list_empty(&p->saved_history))
+	if (uci_list_empty(&p->delta) && uci_list_empty(&p->saved_delta))
 		goto done;
 
 	lua_newtable(L);
-	uci_foreach_element(&p->saved_history, e) {
+	uci_foreach_element(&p->saved_delta, e) {
 		uci_lua_add_change(L, e);
 	}
-	uci_foreach_element(&p->history, e) {
+	uci_foreach_element(&p->delta, e) {
 		uci_lua_add_change(L, e);
 	}
 	lua_setfield(L, -2, p->e.name);
@@ -810,14 +810,14 @@ uci_lua_get_savedir(lua_State *L)
 }
 
 static int
-uci_lua_add_history(lua_State *L)
+uci_lua_add_delta(lua_State *L)
 {
 	struct uci_context *ctx;
 	int ret, offset = 0;
 
 	ctx = find_context(L, &offset);
 	luaL_checkstring(L, 1 + offset);
-	ret = uci_add_history_path(ctx, lua_tostring(L, -1));
+	ret = uci_add_delta_path(ctx, lua_tostring(L, -1));
 	return uci_push_status(L, ctx, false);
 }
 
@@ -902,7 +902,7 @@ static const luaL_Reg uci[] = {
 	{ "reorder", uci_lua_reorder },
 	{ "changes", uci_lua_changes },
 	{ "foreach", uci_lua_foreach },
-	{ "add_history", uci_lua_add_history },
+	{ "add_delta", uci_lua_add_delta },
 	{ "load_plugins", uci_lua_load_plugins },
 	{ "get_confdir", uci_lua_get_confdir },
 	{ "set_confdir", uci_lua_set_confdir },
diff --git a/uci.h b/uci.h
index 4fa0b6a..5644ca8 100644
--- a/uci.h
+++ b/uci.h
@@ -62,7 +62,7 @@ struct uci_element;
 struct uci_package;
 struct uci_section;
 struct uci_option;
-struct uci_history;
+struct uci_delta;
 struct uci_context;
 struct uci_backend;
 struct uci_parse_context;
@@ -104,7 +104,7 @@ extern void uci_get_errorstr(struct uci_context *ctx, char **dest, const char *s
  * @single: ignore the 'package' keyword and parse everything into a single package
  *
  * the name parameter is for config files that don't explicitly use the 'package <...>' keyword
- * if 'package' points to a non-null struct pointer, enable history tracking and merge 
+ * if 'package' points to a non-null struct pointer, enable delta tracking and merge 
  */
 extern int uci_import(struct uci_context *ctx, FILE *stream, const char *name, struct uci_package **package, bool single);
 
@@ -204,7 +204,7 @@ extern int uci_rename(struct uci_context *ctx, struct uci_ptr *ptr);
 extern int uci_delete(struct uci_context *ctx, struct uci_ptr *ptr);
 
 /**
- * uci_save: save change history for a package
+ * uci_save: save change delta for a package
  * @ctx: uci context
  * @p: uci_package struct
  */
@@ -214,7 +214,7 @@ extern int uci_save(struct uci_context *ctx, struct uci_package *p);
  * uci_commit: commit changes to a package
  * @ctx: uci context
  * @p: uci_package struct pointer
- * @overwrite: overwrite existing config data and flush history
+ * @overwrite: overwrite existing config data and flush delta
  *
  * committing may reload the whole uci_package data,
  * the supplied pointer is updated accordingly
@@ -230,7 +230,7 @@ extern int uci_commit(struct uci_context *ctx, struct uci_package **p, bool over
 extern int uci_list_configs(struct uci_context *ctx, char ***list);
 
 /** 
- * uci_set_savedir: override the default history save directory
+ * uci_set_savedir: override the default delta save directory
  * @ctx: uci context
  * @dir: directory name
  */
@@ -244,14 +244,14 @@ extern int uci_set_savedir(struct uci_context *ctx, const char *dir);
 extern int uci_set_confdir(struct uci_context *ctx, const char *dir);
 
 /**
- * uci_add_history_path: add a directory to the search path for change history files
+ * uci_add_delta_path: add a directory to the search path for change delta files
  * @ctx: uci context
  * @dir: directory name
  *
  * This function allows you to add directories, which contain 'overlays'
  * for the active config, that will never be committed.
  */
-extern int uci_add_history_path(struct uci_context *ctx, const char *dir);
+extern int uci_add_delta_path(struct uci_context *ctx, const char *dir);
 
 /**
  * uci_revert: revert all changes to a config item
@@ -336,7 +336,7 @@ int uci_parse_ptr(struct uci_context *ctx, struct uci_ptr *ptr, char *str);
 /* UCI data structures */
 enum uci_type {
 	UCI_TYPE_UNSPEC = 0,
-	UCI_TYPE_HISTORY = 1,
+	UCI_TYPE_DELTA = 1,
 	UCI_TYPE_PACKAGE = 2,
 	UCI_TYPE_SECTION = 3,
 	UCI_TYPE_OPTION = 4,
@@ -356,7 +356,7 @@ enum uci_flags {
 	UCI_FLAG_STRICT =        (1 << 0), /* strict mode for the parser */
 	UCI_FLAG_PERROR =        (1 << 1), /* print parser error messages */
 	UCI_FLAG_EXPORT_NAME =   (1 << 2), /* when exporting, name unnamed sections */
-	UCI_FLAG_SAVED_HISTORY = (1 << 3), /* store the saved history in memory as well */
+	UCI_FLAG_SAVED_DELTA = (1 << 3), /* store the saved delta in memory as well */
 };
 
 struct uci_element
@@ -396,8 +396,8 @@ struct uci_context
 	char *confdir;
 	char *savedir;
 
-	/* search path for history files */
-	struct uci_list history_path;
+	/* search path for delta files */
+	struct uci_list delta_path;
 
 	/* private: */
 	int err;
@@ -416,15 +416,15 @@ struct uci_package
 	struct uci_element e;
 	struct uci_list sections;
 	struct uci_context *ctx;
-	bool has_history;
+	bool has_delta;
 	char *path;
 
 	/* private: */
 	struct uci_backend *backend;
 	void *priv;
 	int n_section;
-	struct uci_list history;
-	struct uci_list saved_history;
+	struct uci_list delta;
+	struct uci_list saved_delta;
 };
 
 struct uci_section
@@ -456,7 +456,7 @@ enum uci_command {
 	UCI_CMD_LIST_ADD,
 };
 
-struct uci_history
+struct uci_delta
 {
 	struct uci_element e;
 	enum uci_command cmd;
@@ -487,7 +487,7 @@ struct uci_ptr
 struct uci_hook_ops
 {
 	void (*load)(const struct uci_hook_ops *ops, struct uci_package *p);
-	void (*set)(const struct uci_hook_ops *ops, struct uci_package *p, struct uci_history *e);
+	void (*set)(const struct uci_hook_ops *ops, struct uci_package *p, struct uci_delta *e);
 };
 
 struct uci_hook
@@ -575,7 +575,7 @@ struct uci_plugin
 
 /* wrappers for dynamic type handling */
 #define uci_type_backend UCI_TYPE_BACKEND
-#define uci_type_history UCI_TYPE_HISTORY
+#define uci_type_delta UCI_TYPE_DELTA
 #define uci_type_package UCI_TYPE_PACKAGE
 #define uci_type_section UCI_TYPE_SECTION
 #define uci_type_option UCI_TYPE_OPTION
@@ -586,7 +586,7 @@ struct uci_plugin
 #ifdef UCI_DEBUG_TYPECAST
 static const char *uci_typestr[] = {
 	[uci_type_backend] = "backend",
-	[uci_type_history] = "history",
+	[uci_type_delta] = "delta",
 	[uci_type_package] = "package",
 	[uci_type_section] = "section",
 	[uci_type_option] = "option",
@@ -609,7 +609,7 @@ static void uci_typecast_error(int from, int to)
 	}
 
 BUILD_CAST(backend)
-BUILD_CAST(history)
+BUILD_CAST(delta)
 BUILD_CAST(package)
 BUILD_CAST(section)
 BUILD_CAST(option)
@@ -618,7 +618,7 @@ BUILD_CAST(plugin)
 
 #else
 #define uci_to_backend(ptr) container_of(ptr, struct uci_backend, e)
-#define uci_to_history(ptr) container_of(ptr, struct uci_history, e)
+#define uci_to_delta(ptr) container_of(ptr, struct uci_delta, e)
 #define uci_to_package(ptr) container_of(ptr, struct uci_package, e)
 #define uci_to_section(ptr) container_of(ptr, struct uci_section, e)
 #define uci_to_option(ptr)  container_of(ptr, struct uci_option, e)
diff --git a/uci_internal.h b/uci_internal.h
index 7ce00d0..728920d 100644
--- a/uci_internal.h
+++ b/uci_internal.h
@@ -44,8 +44,8 @@ __plugin void *uci_malloc(struct uci_context *ctx, size_t size);
 __plugin void *uci_realloc(struct uci_context *ctx, void *ptr, size_t size);
 __plugin char *uci_strdup(struct uci_context *ctx, const char *str);
 __plugin bool uci_validate_str(const char *str, bool name);
-__plugin void uci_add_history(struct uci_context *ctx, struct uci_list *list, int cmd, const char *section, const char *option, const char *value);
-__plugin void uci_free_history(struct uci_history *h);
+__plugin void uci_add_delta(struct uci_context *ctx, struct uci_list *list, int cmd, const char *section, const char *option, const char *value);
+__plugin void uci_free_delta(struct uci_delta *h);
 __plugin struct uci_package *uci_alloc_package(struct uci_context *ctx, const char *name);
 
 __private FILE *uci_open_stream(struct uci_context *ctx, const char *filename, int pos, bool write, bool create);
@@ -60,7 +60,7 @@ __private struct uci_element *uci_lookup_list(struct uci_list *list, const char
 __private void uci_fixup_section(struct uci_context *ctx, struct uci_section *s);
 __private void uci_free_package(struct uci_package **package);
 
-__private int uci_load_history(struct uci_context *ctx, struct uci_package *p, bool flush);
+__private int uci_load_delta(struct uci_context *ctx, struct uci_package *p, bool flush);
 
 static inline bool uci_validate_package(const char *str)
 {
-- 
2.41.1