| 1 | ! Recents management module |
| 2 | ! Handles recents.json read/write and recent workspace tracking |
| 3 | |
| 4 | module recents_module |
| 5 | use iso_fortran_env, only: int32 |
| 6 | use config_module, only: get_config_dir, ensure_config_dir |
| 7 | implicit none |
| 8 | private |
| 9 | |
| 10 | public :: recent_t, recents_load, recents_save, recents_add_or_update |
| 11 | public :: recents_exists, recents_get_path, recents_remove |
| 12 | |
| 13 | integer, parameter :: MAX_PATH_LEN = 512 |
| 14 | integer, parameter :: MAX_LABEL_LEN = 128 |
| 15 | integer, parameter :: DEFAULT_MAX_RECENTS = 20 |
| 16 | |
| 17 | type :: recent_t |
| 18 | character(len=MAX_PATH_LEN) :: path = "" |
| 19 | character(len=MAX_LABEL_LEN) :: label = "" |
| 20 | character(len=32) :: last_opened = "" ! ISO 8601 timestamp |
| 21 | integer :: open_count = 0 |
| 22 | end type recent_t |
| 23 | |
| 24 | contains |
| 25 | |
| 26 | !> Get path to recents.json |
| 27 | subroutine recents_get_path(recents_file) |
| 28 | character(len=:), allocatable, intent(out) :: recents_file |
| 29 | character(len=:), allocatable :: config_dir |
| 30 | |
| 31 | call get_config_dir(config_dir) |
| 32 | recents_file = trim(config_dir) // '/recents.json' |
| 33 | end subroutine recents_get_path |
| 34 | |
| 35 | !> Check if recents.json exists |
| 36 | function recents_exists() result(exists) |
| 37 | logical :: exists |
| 38 | character(len=:), allocatable :: recents_file |
| 39 | integer :: unit, ios |
| 40 | |
| 41 | call recents_get_path(recents_file) |
| 42 | open(newunit=unit, file=recents_file, status='old', iostat=ios) |
| 43 | exists = (ios == 0) |
| 44 | if (exists) close(unit) |
| 45 | end function recents_exists |
| 46 | |
| 47 | !> Load recents from recents.json |
| 48 | subroutine recents_load(recents, count, max_recents, success) |
| 49 | type(recent_t), allocatable, intent(out) :: recents(:) |
| 50 | integer, intent(out) :: count, max_recents |
| 51 | logical, intent(out) :: success |
| 52 | character(len=:), allocatable :: recents_file |
| 53 | character(len=1024) :: line |
| 54 | integer :: unit, ios, i |
| 55 | logical :: in_recents, reading_entry |
| 56 | |
| 57 | success = .false. |
| 58 | count = 0 |
| 59 | max_recents = DEFAULT_MAX_RECENTS |
| 60 | allocate(recents(max_recents)) |
| 61 | |
| 62 | ! Ensure config directory exists |
| 63 | call ensure_config_dir(success) |
| 64 | if (.not. success) return |
| 65 | |
| 66 | call recents_get_path(recents_file) |
| 67 | |
| 68 | ! Open file |
| 69 | open(newunit=unit, file=recents_file, status='old', iostat=ios) |
| 70 | if (ios /= 0) then |
| 71 | ! File doesn't exist - return empty list |
| 72 | success = .true. |
| 73 | count = 0 |
| 74 | return |
| 75 | end if |
| 76 | |
| 77 | ! Simple JSON parsing |
| 78 | in_recents = .false. |
| 79 | reading_entry = .false. |
| 80 | i = 0 |
| 81 | |
| 82 | do |
| 83 | read(unit, '(A)', iostat=ios) line |
| 84 | if (ios /= 0) exit |
| 85 | |
| 86 | line = adjustl(line) |
| 87 | |
| 88 | ! Check for max_recents setting |
| 89 | if (index(line, '"max_recents"') > 0) then |
| 90 | call extract_json_int(line, max_recents) |
| 91 | cycle |
| 92 | end if |
| 93 | |
| 94 | ! Check if we're in the recents array |
| 95 | if (index(line, '"recents"') > 0) then |
| 96 | in_recents = .true. |
| 97 | cycle |
| 98 | end if |
| 99 | |
| 100 | if (.not. in_recents) cycle |
| 101 | |
| 102 | ! Look for start of entry |
| 103 | if (index(line, '{') > 0 .and. .not. reading_entry) then |
| 104 | reading_entry = .true. |
| 105 | i = i + 1 |
| 106 | if (i > max_recents) exit |
| 107 | ! Initialize entry |
| 108 | recents(i)%path = "" |
| 109 | recents(i)%label = "" |
| 110 | recents(i)%last_opened = "" |
| 111 | recents(i)%open_count = 0 |
| 112 | cycle |
| 113 | end if |
| 114 | |
| 115 | if (reading_entry) then |
| 116 | ! Parse fields |
| 117 | if (index(line, '"path"') > 0) then |
| 118 | call extract_json_string(line, recents(i)%path) |
| 119 | else if (index(line, '"label"') > 0) then |
| 120 | call extract_json_string(line, recents(i)%label) |
| 121 | else if (index(line, '"last_opened"') > 0) then |
| 122 | call extract_json_string(line, recents(i)%last_opened) |
| 123 | else if (index(line, '"open_count"') > 0) then |
| 124 | call extract_json_int(line, recents(i)%open_count) |
| 125 | end if |
| 126 | |
| 127 | ! Check for end of entry |
| 128 | if (index(line, '}') > 0) then |
| 129 | reading_entry = .false. |
| 130 | end if |
| 131 | end if |
| 132 | end do |
| 133 | |
| 134 | close(unit) |
| 135 | count = i |
| 136 | success = .true. |
| 137 | end subroutine recents_load |
| 138 | |
| 139 | !> Save recents to recents.json |
| 140 | subroutine recents_save(recents, count, max_recents, success) |
| 141 | type(recent_t), intent(in) :: recents(:) |
| 142 | integer, intent(in) :: count, max_recents |
| 143 | logical, intent(out) :: success |
| 144 | character(len=:), allocatable :: recents_file |
| 145 | integer :: unit, ios, i |
| 146 | |
| 147 | success = .false. |
| 148 | |
| 149 | ! Ensure config directory exists |
| 150 | call ensure_config_dir(success) |
| 151 | if (.not. success) return |
| 152 | |
| 153 | call recents_get_path(recents_file) |
| 154 | |
| 155 | ! Write JSON file |
| 156 | open(newunit=unit, file=recents_file, status='replace', iostat=ios) |
| 157 | if (ios /= 0) return |
| 158 | |
| 159 | write(unit, '(A)') '{' |
| 160 | write(unit, '(A,I0,A)') ' "version": "1.0",' |
| 161 | write(unit, '(A,I0,A)') ' "max_recents": ', max_recents, ',' |
| 162 | write(unit, '(A)') ' "recents": [' |
| 163 | |
| 164 | do i = 1, count |
| 165 | write(unit, '(A)') ' {' |
| 166 | write(unit, '(A)') ' "path": "' // trim(recents(i)%path) // '",' |
| 167 | write(unit, '(A)') ' "label": "' // trim(recents(i)%label) // '",' |
| 168 | write(unit, '(A)') ' "last_opened": "' // trim(recents(i)%last_opened) // '",' |
| 169 | write(unit, '(A,I0)') ' "open_count": ', recents(i)%open_count |
| 170 | |
| 171 | if (i < count) then |
| 172 | write(unit, '(A)') ' },' |
| 173 | else |
| 174 | write(unit, '(A)') ' }' |
| 175 | end if |
| 176 | end do |
| 177 | |
| 178 | write(unit, '(A)') ' ]' |
| 179 | write(unit, '(A)') '}' |
| 180 | |
| 181 | close(unit) |
| 182 | success = .true. |
| 183 | end subroutine recents_save |
| 184 | |
| 185 | !> Add or update a recent workspace |
| 186 | subroutine recents_add_or_update(path, label, success) |
| 187 | character(len=*), intent(in) :: path |
| 188 | character(len=*), intent(in) :: label |
| 189 | logical, intent(out) :: success |
| 190 | type(recent_t), allocatable :: recents(:), sorted(:) |
| 191 | integer :: count, max_recents, i, found_index |
| 192 | character(len=32) :: timestamp |
| 193 | |
| 194 | success = .false. |
| 195 | |
| 196 | ! Load existing recents |
| 197 | call recents_load(recents, count, max_recents, success) |
| 198 | if (.not. success) return |
| 199 | |
| 200 | call get_current_timestamp(timestamp) |
| 201 | |
| 202 | ! Check if path already exists |
| 203 | found_index = 0 |
| 204 | do i = 1, count |
| 205 | if (trim(recents(i)%path) == trim(path)) then |
| 206 | found_index = i |
| 207 | exit |
| 208 | end if |
| 209 | end do |
| 210 | |
| 211 | if (found_index > 0) then |
| 212 | ! Update existing entry |
| 213 | recents(found_index)%last_opened = trim(timestamp) |
| 214 | recents(found_index)%open_count = recents(found_index)%open_count + 1 |
| 215 | else |
| 216 | ! Add new entry |
| 217 | if (count >= max_recents) then |
| 218 | ! Remove oldest entry (last in sorted list) |
| 219 | count = count - 1 |
| 220 | end if |
| 221 | |
| 222 | count = count + 1 |
| 223 | recents(count)%path = trim(path) |
| 224 | recents(count)%label = trim(label) |
| 225 | recents(count)%last_opened = trim(timestamp) |
| 226 | recents(count)%open_count = 1 |
| 227 | end if |
| 228 | |
| 229 | ! Sort by last_opened (most recent first) |
| 230 | allocate(sorted(max_recents)) |
| 231 | call sort_recents_by_time(recents, count, sorted) |
| 232 | |
| 233 | ! Save |
| 234 | call recents_save(sorted, count, max_recents, success) |
| 235 | deallocate(sorted) |
| 236 | end subroutine recents_add_or_update |
| 237 | |
| 238 | !> Sort recents by last_opened (most recent first) |
| 239 | subroutine sort_recents_by_time(recents, count, sorted) |
| 240 | type(recent_t), intent(in) :: recents(:) |
| 241 | integer, intent(in) :: count |
| 242 | type(recent_t), intent(out) :: sorted(:) |
| 243 | integer :: i, j, max_idx |
| 244 | character(len=32) :: max_time |
| 245 | logical :: used(count) |
| 246 | |
| 247 | used = .false. |
| 248 | |
| 249 | ! Simple selection sort |
| 250 | do i = 1, count |
| 251 | max_time = "" |
| 252 | max_idx = 0 |
| 253 | |
| 254 | ! Find most recent unused entry |
| 255 | do j = 1, count |
| 256 | if (.not. used(j)) then |
| 257 | if (len_trim(max_time) == 0 .or. recents(j)%last_opened > max_time) then |
| 258 | max_time = recents(j)%last_opened |
| 259 | max_idx = j |
| 260 | end if |
| 261 | end if |
| 262 | end do |
| 263 | |
| 264 | if (max_idx > 0) then |
| 265 | sorted(i) = recents(max_idx) |
| 266 | used(max_idx) = .true. |
| 267 | end if |
| 268 | end do |
| 269 | end subroutine sort_recents_by_time |
| 270 | |
| 271 | !> Extract string value from JSON line |
| 272 | subroutine extract_json_string(line, value) |
| 273 | character(len=*), intent(in) :: line |
| 274 | character(len=*), intent(out) :: value |
| 275 | integer :: start_quote, end_quote, colon_pos |
| 276 | |
| 277 | value = "" |
| 278 | |
| 279 | colon_pos = index(line, ':') |
| 280 | if (colon_pos == 0) return |
| 281 | |
| 282 | start_quote = index(line(colon_pos:), '"') |
| 283 | if (start_quote == 0) return |
| 284 | start_quote = start_quote + colon_pos |
| 285 | |
| 286 | end_quote = index(line(start_quote+1:), '"') |
| 287 | if (end_quote == 0) return |
| 288 | end_quote = end_quote + start_quote |
| 289 | |
| 290 | if (end_quote > start_quote) then |
| 291 | value = line(start_quote+1:end_quote-1) |
| 292 | end if |
| 293 | end subroutine extract_json_string |
| 294 | |
| 295 | !> Extract integer value from JSON line |
| 296 | subroutine extract_json_int(line, value) |
| 297 | character(len=*), intent(in) :: line |
| 298 | integer, intent(out) :: value |
| 299 | character(len=32) :: num_str |
| 300 | integer :: colon_pos, comma_pos, ios |
| 301 | |
| 302 | value = 0 |
| 303 | |
| 304 | colon_pos = index(line, ':') |
| 305 | if (colon_pos == 0) return |
| 306 | |
| 307 | comma_pos = index(line(colon_pos:), ',') |
| 308 | if (comma_pos == 0) comma_pos = len_trim(line) - colon_pos + 1 |
| 309 | |
| 310 | num_str = adjustl(line(colon_pos+1:colon_pos+comma_pos-1)) |
| 311 | read(num_str, *, iostat=ios) value |
| 312 | if (ios /= 0) value = 0 |
| 313 | end subroutine extract_json_int |
| 314 | |
| 315 | !> Get current timestamp in ISO 8601 format |
| 316 | subroutine get_current_timestamp(timestamp) |
| 317 | character(len=*), intent(out) :: timestamp |
| 318 | integer :: values(8) |
| 319 | |
| 320 | call date_and_time(values=values) |
| 321 | |
| 322 | write(timestamp, '(I4.4,A,I2.2,A,I2.2,A,I2.2,A,I2.2,A,I2.2,A)') & |
| 323 | values(1), '-', values(2), '-', values(3), 'T', & |
| 324 | values(5), ':', values(6), ':', values(7), 'Z' |
| 325 | end subroutine get_current_timestamp |
| 326 | |
| 327 | !> Remove a recent workspace by index (Phase 7: handle deleted workspaces) |
| 328 | subroutine recents_remove(index, success) |
| 329 | integer, intent(in) :: index |
| 330 | logical, intent(out) :: success |
| 331 | type(recent_t), allocatable :: recents(:) |
| 332 | integer :: count, max_recents, i |
| 333 | |
| 334 | success = .false. |
| 335 | |
| 336 | ! Load existing recents |
| 337 | call recents_load(recents, count, max_recents, success) |
| 338 | if (.not. success) return |
| 339 | |
| 340 | ! Check bounds |
| 341 | if (index < 1 .or. index > count) then |
| 342 | success = .false. |
| 343 | return |
| 344 | end if |
| 345 | |
| 346 | ! Shift entries after the removed one |
| 347 | do i = index, count - 1 |
| 348 | recents(i) = recents(i + 1) |
| 349 | end do |
| 350 | count = count - 1 |
| 351 | |
| 352 | ! Save updated list |
| 353 | call recents_save(recents, count, max_recents, success) |
| 354 | end subroutine recents_remove |
| 355 | |
| 356 | end module recents_module |
| 357 |