277 lines
12 KiB
Nim
277 lines
12 KiB
Nim
# history.h -- the names of functions that you can call in history.
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# Copyright (C) 1989-2009 Free Software Foundation, Inc.
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#
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# This file contains the GNU History Library (History), a set of
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# routines for managing the text of previously typed lines.
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#
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# History is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# History is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with History. If not, see <http://www.gnu.org/licenses/>.
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#
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{.deadCodeElim: on.}
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import readline
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const
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historyDll = readlineDll
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import times, rltypedefs
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type
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Thistdata* = pointer
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# The structure used to store a history entry.
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type
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THIST_ENTRY*{.pure, final.} = object
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line*: cstring
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timestamp*: cstring # char * rather than time_t for read/write
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data*: Thistdata
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# Size of the history-library-managed space in history entry HS.
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template HISTENT_BYTES*(hs: expr): expr =
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(strlen(hs.line) + strlen(hs.timestamp))
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# A structure used to pass the current state of the history stuff around.
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type
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THISTORY_STATE*{.pure, final.} = object
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entries*: ptr ptr THIST_ENTRY # Pointer to the entries themselves.
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offset*: cint # The location pointer within this array.
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length*: cint # Number of elements within this array.
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size*: cint # Number of slots allocated to this array.
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flags*: cint
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# Flag values for the `flags' member of HISTORY_STATE.
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const
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HS_STIFLED* = 0x00000001
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# Initialization and state management.
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# Begin a session in which the history functions might be used. This
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# just initializes the interactive variables.
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proc using_history*(){.cdecl, importc: "using_history", dynlib: historyDll.}
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# Return the current HISTORY_STATE of the history.
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proc history_get_history_state*(): ptr THISTORY_STATE{.cdecl,
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importc: "history_get_history_state", dynlib: historyDll.}
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# Set the state of the current history array to STATE.
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proc history_set_history_state*(a2: ptr THISTORY_STATE){.cdecl,
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importc: "history_set_history_state", dynlib: historyDll.}
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# Manage the history list.
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# Place STRING at the end of the history list.
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# The associated data field (if any) is set to NULL.
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proc add_history*(a2: cstring){.cdecl, importc: "add_history",
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dynlib: historyDll.}
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# Change the timestamp associated with the most recent history entry to
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# STRING.
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proc add_history_time*(a2: cstring){.cdecl, importc: "add_history_time",
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dynlib: historyDll.}
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# A reasonably useless function, only here for completeness. WHICH
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# is the magic number that tells us which element to delete. The
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# elements are numbered from 0.
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proc remove_history*(a2: cint): ptr THIST_ENTRY{.cdecl,
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importc: "remove_history", dynlib: historyDll.}
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# Free the history entry H and return any application-specific data
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# associated with it.
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proc free_history_entry*(a2: ptr THIST_ENTRY): Thistdata{.cdecl,
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importc: "free_history_entry", dynlib: historyDll.}
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# Make the history entry at WHICH have LINE and DATA. This returns
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# the old entry so you can dispose of the data. In the case of an
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# invalid WHICH, a NULL pointer is returned.
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proc replace_history_entry*(a2: cint, a3: cstring, a4: Thistdata): ptr THIST_ENTRY{.
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cdecl, importc: "replace_history_entry", dynlib: historyDll.}
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# Clear the history list and start over.
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proc clear_history*(){.cdecl, importc: "clear_history", dynlib: historyDll.}
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# Stifle the history list, remembering only MAX number of entries.
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proc stifle_history*(a2: cint){.cdecl, importc: "stifle_history",
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dynlib: historyDll.}
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# Stop stifling the history. This returns the previous amount the
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# history was stifled by. The value is positive if the history was
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# stifled, negative if it wasn't.
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proc unstifle_history*(): cint{.cdecl, importc: "unstifle_history",
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dynlib: historyDll.}
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# Return 1 if the history is stifled, 0 if it is not.
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proc history_is_stifled*(): cint{.cdecl, importc: "history_is_stifled",
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dynlib: historyDll.}
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# Information about the history list.
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# Return a NULL terminated array of HIST_ENTRY which is the current input
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# history. Element 0 of this list is the beginning of time. If there
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# is no history, return NULL.
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proc history_list*(): ptr ptr THIST_ENTRY{.cdecl, importc: "history_list",
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dynlib: historyDll.}
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# Returns the number which says what history element we are now
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# looking at.
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proc where_history*(): cint{.cdecl, importc: "where_history", dynlib: historyDll.}
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# Return the history entry at the current position, as determined by
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# history_offset. If there is no entry there, return a NULL pointer.
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proc current_history*(): ptr THIST_ENTRY{.cdecl, importc: "current_history",
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dynlib: historyDll.}
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# Return the history entry which is logically at OFFSET in the history
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# array. OFFSET is relative to history_base.
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proc history_get*(a2: cint): ptr THIST_ENTRY{.cdecl, importc: "history_get",
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dynlib: historyDll.}
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# Return the timestamp associated with the HIST_ENTRY * passed as an
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# argument
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proc history_get_time*(a2: ptr THIST_ENTRY): Time{.cdecl,
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importc: "history_get_time", dynlib: historyDll.}
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# Return the number of bytes that the primary history entries are using.
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# This just adds up the lengths of the_history->lines.
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proc history_total_bytes*(): cint{.cdecl, importc: "history_total_bytes",
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dynlib: historyDll.}
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# Moving around the history list.
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# Set the position in the history list to POS.
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proc history_set_pos*(a2: cint): cint{.cdecl, importc: "history_set_pos",
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dynlib: historyDll.}
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# Back up history_offset to the previous history entry, and return
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# a pointer to that entry. If there is no previous entry, return
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# a NULL pointer.
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proc previous_history*(): ptr THIST_ENTRY{.cdecl, importc: "previous_history",
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dynlib: historyDll.}
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# Move history_offset forward to the next item in the input_history,
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# and return the a pointer to that entry. If there is no next entry,
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# return a NULL pointer.
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proc next_history*(): ptr THIST_ENTRY{.cdecl, importc: "next_history",
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dynlib: historyDll.}
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# Searching the history list.
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# Search the history for STRING, starting at history_offset.
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# If DIRECTION < 0, then the search is through previous entries,
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# else through subsequent. If the string is found, then
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# current_history () is the history entry, and the value of this function
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# is the offset in the line of that history entry that the string was
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# found in. Otherwise, nothing is changed, and a -1 is returned.
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proc history_search*(a2: cstring, a3: cint): cint{.cdecl,
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importc: "history_search", dynlib: historyDll.}
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# Search the history for STRING, starting at history_offset.
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# The search is anchored: matching lines must begin with string.
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# DIRECTION is as in history_search().
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proc history_search_prefix*(a2: cstring, a3: cint): cint{.cdecl,
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importc: "history_search_prefix", dynlib: historyDll.}
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# Search for STRING in the history list, starting at POS, an
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# absolute index into the list. DIR, if negative, says to search
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# backwards from POS, else forwards.
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# Returns the absolute index of the history element where STRING
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# was found, or -1 otherwise.
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proc history_search_pos*(a2: cstring, a3: cint, a4: cint): cint{.cdecl,
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importc: "history_search_pos", dynlib: historyDll.}
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# Managing the history file.
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# Add the contents of FILENAME to the history list, a line at a time.
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# If FILENAME is NULL, then read from ~/.history. Returns 0 if
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# successful, or errno if not.
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proc read_history*(a2: cstring): cint{.cdecl, importc: "read_history",
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dynlib: historyDll.}
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# Read a range of lines from FILENAME, adding them to the history list.
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# Start reading at the FROM'th line and end at the TO'th. If FROM
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# is zero, start at the beginning. If TO is less than FROM, read
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# until the end of the file. If FILENAME is NULL, then read from
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# ~/.history. Returns 0 if successful, or errno if not.
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proc read_history_range*(a2: cstring, a3: cint, a4: cint): cint{.cdecl,
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importc: "read_history_range", dynlib: historyDll.}
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# Write the current history to FILENAME. If FILENAME is NULL,
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# then write the history list to ~/.history. Values returned
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# are as in read_history ().
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proc write_history*(a2: cstring): cint{.cdecl, importc: "write_history",
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dynlib: historyDll.}
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# Append NELEMENT entries to FILENAME. The entries appended are from
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# the end of the list minus NELEMENTs up to the end of the list.
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proc append_history*(a2: cint, a3: cstring): cint{.cdecl,
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importc: "append_history", dynlib: historyDll.}
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# Truncate the history file, leaving only the last NLINES lines.
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proc history_truncate_file*(a2: cstring, a3: cint): cint{.cdecl,
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importc: "history_truncate_file", dynlib: historyDll.}
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# History expansion.
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# Expand the string STRING, placing the result into OUTPUT, a pointer
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# to a string. Returns:
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#
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# 0) If no expansions took place (or, if the only change in
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# the text was the de-slashifying of the history expansion
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# character)
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# 1) If expansions did take place
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# -1) If there was an error in expansion.
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# 2) If the returned line should just be printed.
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#
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# If an error occurred in expansion, then OUTPUT contains a descriptive
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# error message.
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proc history_expand*(a2: cstring, a3: cstringArray): cint{.cdecl,
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importc: "history_expand", dynlib: historyDll.}
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# Extract a string segment consisting of the FIRST through LAST
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# arguments present in STRING. Arguments are broken up as in
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# the shell.
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proc history_arg_extract*(a2: cint, a3: cint, a4: cstring): cstring{.cdecl,
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importc: "history_arg_extract", dynlib: historyDll.}
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# Return the text of the history event beginning at the current
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# offset into STRING. Pass STRING with *INDEX equal to the
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# history_expansion_char that begins this specification.
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# DELIMITING_QUOTE is a character that is allowed to end the string
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# specification for what to search for in addition to the normal
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# characters `:', ` ', `\t', `\n', and sometimes `?'.
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proc get_history_event*(a2: cstring, a3: ptr cint, a4: cint): cstring{.cdecl,
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importc: "get_history_event", dynlib: historyDll.}
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# Return an array of tokens, much as the shell might. The tokens are
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# parsed out of STRING.
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proc history_tokenize*(a2: cstring): cstringArray{.cdecl,
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importc: "history_tokenize", dynlib: historyDll.}
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when false:
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# Exported history variables.
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var history_base*{.importc: "history_base", dynlib: historyDll.}: cint
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var history_length*{.importc: "history_length", dynlib: historyDll.}: cint
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var history_max_entries*{.importc: "history_max_entries", dynlib: historyDll.}: cint
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var history_expansion_char*{.importc: "history_expansion_char",
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dynlib: historyDll.}: char
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var history_subst_char*{.importc: "history_subst_char", dynlib: historyDll.}: char
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var history_word_delimiters*{.importc: "history_word_delimiters",
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dynlib: historyDll.}: cstring
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var history_comment_char*{.importc: "history_comment_char", dynlib: historyDll.}: char
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var history_no_expand_chars*{.importc: "history_no_expand_chars",
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dynlib: historyDll.}: cstring
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var history_search_delimiter_chars*{.importc: "history_search_delimiter_chars",
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dynlib: historyDll.}: cstring
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var history_quotes_inhibit_expansion*{.
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importc: "history_quotes_inhibit_expansion", dynlib: historyDll.}: cint
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var history_write_timestamps*{.importc: "history_write_timestamps",
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dynlib: historyDll.}: cint
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