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** true the redo a change. If there is nothing to undo (or redo) then
** this routine is a noop.
*/
static void undo_one(const char *zPathname, int redoFlag){
Stmt q;
char *zFullname;
db_prepare(&q,
"SELECT content, exists FROM undo WHERE pathname=%Q AND redoflag=%d",
zPathname, redoFlag
);
if( db_step(&q)==SQLITE_ROW ){
int old_exists;
int new_exists;
Blob current;
Blob new;
zFullname = mprintf("%s/%s", g.zLocalRoot, zPathname);
new_exists = file_size(zFullname)>=0;
if( new_exists ){
blob_read_from_file(¤t, zFullname);
}else{
blob_zero(¤t);
}
blob_zero(&new);
old_exists = db_column_int(&q, 1);
if( old_exists ){
db_ephemeral_blob(&q, 0, &new);
}
printf("%sdo changes to %s\n", redoFlag ? "Re" : "Un", zPathname);
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** true the redo a change. If there is nothing to undo (or redo) then
** this routine is a noop.
*/
static void undo_one(const char *zPathname, int redoFlag){
Stmt q;
char *zFullname;
db_prepare(&q,
"SELECT content, existsflag FROM undo WHERE pathname=%Q AND redoflag=%d",
zPathname, redoFlag
);
if( db_step(&q)==SQLITE_ROW ){
int old_exists;
int new_exists;
Blob current;
Blob new;
zFullname = mprintf("%s/%s", g.zLocalRoot, zPathname);
new_exists = file_size(zFullname)>=0;
if( new_exists ){
blob_read_from_file(¤t, zFullname);
}else{
blob_zero(¤t);
}
blob_zero(&new);
old_exists = db_column_int(&q, 1);
if( old_exists ){
db_ephemeral_blob(&q, 0, &new);
}
if( old_exists ){
if( new_exists ){
printf("%s %s\n", redoFlag ? "REDO" : "UNDO", zPathname);
}else{
printf("NEW %s\n", zPathname);
}
blob_write_to_file(&new, zFullname);
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}
/*
** Undo or redo all undoable or redoable changes.
*/
static void undo_all(int redoFlag){
Stmt q;
db_prepare(&q, "SELECT pathname FROM undo WHERE redoflag=%d"
" ORDER BY +pathname", redoFlag);
while( db_step(&q) ){
const char *zPathname = db_column_text(&q, 0);
undo_one(zPathname, redoFlag);
}
db_finalize(&q);
db_multi_exec(
"CREATE TEMP TABLE undo_vfile_2 AS SELECT * FROM vfile;"
"DELETE FROM vfile;"
"INSERT INTO vfile SELECT * FROM undo_vfile;"
"DELETE FROM undo_vfile;"
"INSERT INTO undo_vfile SELECT * FROM undo_vfile_2;"
"DROP TABLE undo_vfile_2;"
"CREATE TEMP TABLE undo_vmerge_2 AS SELECT * FROM vmerge;"
"DELETE FROM vmerge;"
"INSERT INTO vmerge SELECT * FROM undo_vmerge;"
"DELETE FROM undo_vmerge;"
"INSERT INTO undo_vmerge SELECT * FROM undo_vmerge_2;"
"DROP TABLE undo_vmerge_2;"
);
}
/*
** Reset the the undo memory.
*/
void undo_reset(void){
static const char zSql[] =
@ DROP TABLE IF EXISTS undo;
@ DROP TABLE IF EXISTS undo_vfile;
@ DROP TABLE IF EXISTS undo_vmerge;
;
db_multi_exec(zSql);
db_lset_int("undo_available", 0);
}
/*
** Begin capturing a snapshot that can be undone.
*/
void undo_begin(void){
static const char zSql[] =
@ CREATE TABLE undo(
@ pathname TEXT UNIQUE, -- Name of the file
@ redoflag BOOLEAN, -- 0 for undoable. 1 for redoable
@ existsflag BOOLEAN, -- True if the file exists
@ content BLOB -- Saved content
@ );
@ CREATE TABLE undo_vfile AS SELECT * FROM vfile;
@ CREATE TABLE undo_vfile AS SELECT * FROM vmerge;
;
undo_reset();
db_multi_exec(zSql);
db_lset_int("undo_available", 1);
}
/*
** Save the current content of the file zPathname so that it
** will be undoable. The name is relative to the root of the
** tree.
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}
/*
** Undo or redo all undoable or redoable changes.
*/
static void undo_all(int redoFlag){
Stmt q;
int ucid;
int ncid;
db_prepare(&q, "SELECT pathname FROM undo WHERE redoflag=%d"
" ORDER BY +pathname", redoFlag);
while( db_step(&q)==SQLITE_ROW ){
const char *zPathname = db_column_text(&q, 0);
undo_one(zPathname, redoFlag);
}
db_finalize(&q);
db_multi_exec(
"CREATE TEMP TABLE undo_vfile_2 AS SELECT * FROM vfile;"
"DELETE FROM vfile;"
"INSERT INTO vfile SELECT * FROM undo_vfile;"
"DELETE FROM undo_vfile;"
"INSERT INTO undo_vfile SELECT * FROM undo_vfile_2;"
"DROP TABLE undo_vfile_2;"
"CREATE TEMP TABLE undo_vmerge_2 AS SELECT * FROM vmerge;"
"DELETE FROM vmerge;"
"INSERT INTO vmerge SELECT * FROM undo_vmerge;"
"DELETE FROM undo_vmerge;"
"INSERT INTO undo_vmerge SELECT * FROM undo_vmerge_2;"
"DROP TABLE undo_vmerge_2;"
);
ncid = db_lget_int("undo_checkout", 0);
ucid = db_lget_int("checkout", 0);
db_lset_int("undo_checkout", ucid);
db_lset_int("checkout", ncid);
}
/*
** Reset the the undo memory.
*/
void undo_reset(void){
static const char zSql[] =
@ DROP TABLE IF EXISTS undo;
@ DROP TABLE IF EXISTS undo_vfile;
@ DROP TABLE IF EXISTS undo_vmerge;
;
db_multi_exec(zSql);
db_lset_int("undo_available", 0);
db_lset_int("undo_checkout", 0);
}
/*
** Begin capturing a snapshot that can be undone.
*/
void undo_begin(void){
int cid;
static const char zSql[] =
@ CREATE TABLE undo(
@ pathname TEXT UNIQUE, -- Name of the file
@ redoflag BOOLEAN, -- 0 for undoable. 1 for redoable
@ existsflag BOOLEAN, -- True if the file exists
@ content BLOB -- Saved content
@ );
@ CREATE TABLE undo_vfile AS SELECT * FROM vfile;
@ CREATE TABLE undo_vmerge AS SELECT * FROM vmerge;
;
undo_reset();
db_multi_exec(zSql);
cid = db_lget_int("checkout", 0);
db_lset_int("undo_checkout", cid);
db_lset_int("undo_available", 1);
}
/*
** Save the current content of the file zPathname so that it
** will be undoable. The name is relative to the root of the
** tree.
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if( existsFlag ){
blob_read_from_file(&content, zFullname);
db_bind_blob(&q, ":c", &content);
}
free(zFullname);
db_step(&q);
db_finalize(&q);
blob_reset(&content);
}
/*
** COMMAND: undo
**
** Usage: %fossil undo ?FILENAME...?
**
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if( existsFlag ){
blob_read_from_file(&content, zFullname);
db_bind_blob(&q, ":c", &content);
}
free(zFullname);
db_step(&q);
db_finalize(&q);
if( existsFlag ){
blob_reset(&content);
}
}
/*
** COMMAND: undo
**
** Usage: %fossil undo ?FILENAME...?
**
|