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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",
"SELECT content, existsflag, isExe FROM undo"
" WHERE pathname=%Q AND redoflag=%d",
zPathname, redoFlag
);
if( db_step(&q)==SQLITE_ROW ){
int old_exists;
int new_exists;
int old_exe;
int new_exe;
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);
new_exe = file_isexe(zFullname);
}else{
blob_zero(¤t);
new_exe = 0;
}
blob_zero(&new);
old_exists = db_column_int(&q, 1);
old_exe = db_column_int(&q, 2);
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);
file_setexe(zFullname, old_exe);
}else{
printf("DELETE %s\n", zPathname);
unlink(zFullname);
}
blob_reset(&new);
free(zFullname);
db_finalize(&q);
db_prepare(&q,
"UPDATE undo SET content=:c, existsflag=%d, redoflag=NOT redoflag"
"UPDATE undo SET content=:c, existsflag=%d, isExe=%d,"
" redoflag=NOT redoflag"
" WHERE pathname=%Q",
new_exists, zPathname
new_exists, new_exe, zPathname
);
if( new_exists ){
db_bind_blob(&q, ":c", ¤t);
}
db_step(&q);
blob_reset(¤t);
}
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int cid;
const char *zDb = db_name("localdb");
static const char zSql[] =
@ CREATE TABLE %s.undo(
@ pathname TEXT UNIQUE, -- Name of the file
@ redoflag BOOLEAN, -- 0 for undoable. 1 for redoable
@ existsflag BOOLEAN, -- True if the file exists
@ isExe BOOLEAN, -- True if the file is executable
@ content BLOB -- Saved content
@ );
@ CREATE TABLE %s.undo_vfile AS SELECT * FROM vfile;
@ CREATE TABLE %s.undo_vmerge AS SELECT * FROM vmerge;
;
if( undoDisable ) return;
undo_reset();
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int existsFlag;
Stmt q;
if( !undoActive ) return;
zFullname = mprintf("%s%s", g.zLocalRoot, zPathname);
existsFlag = file_size(zFullname)>=0;
db_prepare(&q,
"INSERT OR IGNORE INTO undo(pathname,redoflag,existsflag,content)"
" VALUES(%Q,0,%d,:c)",
zPathname, existsFlag
"INSERT OR IGNORE INTO undo(pathname,redoflag,existsflag,isExe,content)"
" VALUES(%Q,0,%d,%d,:c)",
zPathname, existsFlag, file_isexe(zFullname)
);
if( existsFlag ){
blob_read_from_file(&content, zFullname);
db_bind_blob(&q, ":c", &content);
}
free(zFullname);
db_step(&q);
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