vis-core.h

   1 #ifndef VIS_CORE_H
   2 #define VIS_CORE_H
   3
   4 #include <setjmp.h>
   5 #include "vis.h"
   6 #include "sam.h"
   7 #include "vis-lua.h"
   8 #include "text.h"
   9 #include "text-util.h"
  10 #include "map.h"
  11 #include "array.h"
  12 #include "buffer.h"
  13 #include "util.h"
  14
  15 /* a mode contains a set of key bindings which are currently valid.
  16  *
  17  * each mode can specify one parent mode which is consultated if a given key
  18  * is not found in the current mode. hence the modes form a tree which is
  19  * searched from the current mode up towards the root mode until a valid binding
  20  * is found.
  21  *
  22  * if no binding is found, mode->input(...) is called and the user entered
  23  * keys are passed as argument. this is used to change the document content.
  24  */
  25 typedef struct Mode Mode;
  26 struct Mode {
  27         enum VisMode id;
  28         Mode *parent;                       /* if no match is found in this mode, search will continue there */
  29         Map *bindings;
  30         const char *name;                   /* descriptive, user facing name of the mode */
  31         const char *status;                 /* name displayed in the window status bar */
  32         const char *help;                   /* short description used by :help */
  33         void (*enter)(Vis*, Mode *old);           /* called right before the mode becomes active */
  34         void (*leave)(Vis*, Mode *new);           /* called right before the mode becomes inactive */
  35         void (*input)(Vis*, const char*, size_t); /* called whenever a key is not found in this mode and all its parent modes */
  36         void (*idle)(Vis*);                 /* called whenever a certain idle time i.e. without any user input elapsed */
  37         time_t idle_timeout;                /* idle time in seconds after which the registered function will be called */
  38         bool visual;                        /* whether text selection is possible in this mode */
  39 };
  40
  41 typedef struct {
  42         Array values;
  43         bool linewise; /* place register content on a new line when inserting? */
  44         bool append;
  45         enum {
  46                 REGISTER_NORMAL,
  47                 REGISTER_NUMBER,
  48                 REGISTER_BLACKHOLE,
  49                 REGISTER_CLIPBOARD,
  50         } type;
  51 } Register;
  52
  53 struct OperatorContext {
  54         int count;        /* how many times should the command be executed? */
  55         Register *reg;    /* always non-NULL, set to a default register */
  56         size_t reg_slot;  /* register slot to use */
  57         Filerange range;  /* which part of the file should be affected by the operator */
  58         size_t pos;       /* at which byte from the start of the file should the operation start? */
  59         size_t newpos;    /* new position after motion or EPOS if none given */
  60         bool linewise;    /* should the changes always affect whole lines? */
  61         const Arg *arg;   /* arbitrary arguments */
  62         void *context;    /* used by user-registered operators */
  63 };
  64
  65 typedef struct {
  66         /* operator logic, returns new cursor position, if EPOS is
  67          * the cursor is disposed (except if it is the primary one) */
  68         VisOperatorFunction *func;
  69         void *context;
  70 } Operator;
  71
  72 typedef struct { /* Motion implementation, takes a cursor postion and returns a new one */
  73         /* TODO: merge types / use union to save space */
  74         size_t (*cur)(Selection*);
  75         size_t (*txt)(Text*, size_t pos);
  76         size_t (*file)(Vis*, File*, Selection*);
  77         size_t (*vis)(Vis*, Text*, size_t pos);
  78         size_t (*view)(Vis*, View*);
  79         size_t (*win)(Vis*, Win*, size_t pos);
  80         size_t (*user)(Vis*, Win*, void*, size_t pos);
  81         enum {
  82                 LINEWISE  = VIS_MOTIONTYPE_LINEWISE,  /* should the covered range be extended to whole lines? */
  83                 CHARWISE  = VIS_MOTIONTYPE_CHARWISE,  /* scrolls window content until position is visible */
  84                 INCLUSIVE = 1 << 2,  /* should new position be included in operator range? */
  85                 LINEWISE_INCLUSIVE = 1 << 3,  /* inclusive, but only if motion is linewise? */
  86                 IDEMPOTENT = 1 << 4, /* does the returned postion remain the same if called multiple times? */
  87                 JUMP = 1 << 5, /* should the resulting position of the motion be recorded in the jump list? */
  88                 COUNT_EXACT = 1 << 6, /* fail (keep initial position) if count can not be satisfied exactly */
  89         } type;
  90         void *data;
  91 } Movement;
  92
  93 typedef struct {
  94         /* gets a cursor position and returns a file range (or text_range_empty())
  95          * representing the text object containing the position. */
  96         Filerange (*txt)(Text*, size_t pos);
  97         Filerange (*vis)(Vis*, Text*, size_t pos);
  98         Filerange (*user)(Vis*, Win*, void *data, size_t pos);
  99         enum {
 100                 TEXTOBJECT_DELIMITED_INNER = 1 << 0, /* single byte delimited, inner variant */
 101                 TEXTOBJECT_DELIMITED_OUTER = 1 << 1, /* single byte delimited, outer variant */
 102                 TEXTOBJECT_NON_CONTIGUOUS  = 1 << 2, /* multiple applications yield a split range */
 103                 TEXTOBJECT_EXTEND_FORWARD  = 1 << 3, /* multiple applications extend towards the end of file (default) */
 104                 TEXTOBJECT_EXTEND_BACKWARD = 1 << 4, /* multiple applications extend towards the begin of file */
 105         } type;
 106         void *data;
 107 } TextObject;
 108
 109 /* a macro is just a sequence of symbolic keys as received from ui->getkey */
 110 typedef Buffer Macro;
 111 #define macro_init buffer_init
 112 #define macro_release buffer_release
 113 #define macro_reset buffer_clear
 114 #define macro_append buffer_append0
 115
 116 typedef struct {             /** collects all information until an operator is executed */
 117         int count;
 118         enum VisMode mode;
 119         enum VisMotionType type;
 120         const Operator *op;
 121         const Movement *movement;
 122         const TextObject *textobj;
 123         const Macro *macro;
 124         Register *reg;
 125         enum VisMark mark;
 126         Arg arg;
 127 } Action;
 128
 129 typedef struct Change Change;
 130 typedef struct {
 131         Change *changes;      /* all changes in monotonically increasing file position */
 132         Change *latest;       /* most recent change */
 133         enum SamError error;  /* non-zero in case something went wrong */
 134 } Transcript;
 135
 136 typedef struct {
 137         Array prev;
 138         Array next;
 139         size_t max;
 140 } MarkList;
 141
 142 struct File { /* shared state among windows displaying the same file */
 143         Text *text;                      /* data structure holding the file content */
 144         const char *name;                /* file name used when loading/saving */
 145         volatile sig_atomic_t truncated; /* whether the underlying memory mapped region became invalid (SIGBUS) */
 146         int fd;                          /* output file descriptor associated with this file or -1 if loaded by file name */
 147         bool internal;                   /* whether it is an internal file (e.g. used for the prompt) */
 148         struct stat stat;                /* filesystem information when loaded/saved, used to detect changes outside the editor */
 149         int refcount;                    /* how many windows are displaying this file? (always >= 1) */
 150         Array marks[VIS_MARK_INVALID];   /* marks which are shared across windows */
 151         enum TextSaveMethod save_method; /* whether the file is saved using rename(2) or overwritten */
 152         Transcript transcript;           /* keeps track of changes performed by sam commands */
 153         File *next, *prev;
 154 };
 155
 156 struct Win {
 157         Vis *vis;               /* editor instance to which this window belongs to */
 158         UiWin *ui;              /* ui object handling visual appearance of this window */
 159         File *file;             /* file being displayed in this window */
 160         View *view;             /* currently displayed part of underlying text */
 161         MarkList jumplist;      /* LRU jump management */
 162         Array saved_selections; /* register used to store selections */
 163         Mode modes[VIS_MODE_INVALID]; /* overlay mods used for per window key bindings */
 164         Win *parent;            /* window which was active when showing the command prompt */
 165         Mode *parent_mode;      /* mode which was active when showing the command prompt */
 166         Win *prev, *next;       /* neighbouring windows */
 167 };
 168
 169 struct Vis {
 170         Ui *ui;                              /* user interface repsonsible for visual appearance */
 171         File *files;                         /* all files currently managed by this editor instance */
 172         File *command_file;                  /* special internal file used to store :-command prompt */
 173         File *search_file;                   /* special internal file used to store /,? search prompt */
 174         File *error_file;                    /* special internal file used to store lua error messages */
 175         Win *windows;                        /* all windows currently managed by this editor instance */
 176         Win *win;                            /* currently active/focused window */
 177         Win *message_window;                 /* special window to display multi line messages */
 178         Register registers[VIS_REG_INVALID]; /* registers used for text manipulations yank/put etc. and macros */
 179         Macro *recording, *last_recording;   /* currently (if non NULL) and least recently recorded macro */
 180         const Macro *replaying;              /* macro currently being replayed */
 181         Macro *macro_operator;               /* special macro used to repeat certain operators */
 182         Mode *mode_before_prompt;            /* user mode which was active before entering prompt */
 183         char search_char[8];                 /* last used character to search for via 'f', 'F', 't', 'T' */
 184         int last_totill;                     /* last to/till movement used for ';' and ',' */
 185         int search_direction;                /* used for `n` and `N` */
 186         int tabwidth;                        /* how many spaces should be used to display a tab */
 187         bool expandtab;                      /* whether typed tabs should be converted to spaces */
 188         bool autoindent;                     /* whether indentation should be copied from previous line on newline */
 189         bool change_colors;                  /* whether to adjust 256 color palette for true colors */
 190         char *shell;                         /* shell used to launch external commands */
 191         Map *cmds;                           /* ":"-commands, used for unique prefix queries */
 192         Map *usercmds;                       /* user registered ":"-commands */
 193         Map *options;                        /* ":set"-options */
 194         Map *keymap;                         /* key translation before any bindings are matched */
 195         bool keymap_disabled;                /* ignore key map for next key press, gets automatically re-enabled */
 196         char key[VIS_KEY_LENGTH_MAX];        /* last pressed key as reported from the UI */
 197         char key_current[VIS_KEY_LENGTH_MAX];/* current key being processed by the input queue */
 198         char key_prev[VIS_KEY_LENGTH_MAX];   /* previous key which was processed by the input queue */
 199         Buffer input_queue;                  /* holds pending input keys */
 200         bool errorhandler;                   /* whether we are currently in an error handler, used to avoid recursion */
 201         Action action;                       /* current action which is in progress */
 202         Action action_prev;                  /* last operator action used by the repeat (dot) command */
 203         Mode *mode;                          /* currently active mode, used to search for keybindings */
 204         Mode *mode_prev;                     /* previsouly active user mode */
 205         bool initialized;                    /* whether UI and Lua integration has been initialized */
 206         int nesting_level;                   /* parsing state to hold keep track of { } nesting level */
 207         volatile bool running;               /* exit main loop once this becomes false */
 208         int exit_status;                     /* exit status when terminating main loop */
 209         volatile sig_atomic_t interrupted;   /* abort command (SIGINT occured) */
 210         volatile sig_atomic_t sigbus;        /* one of the memory mapped region became unavailable (SIGBUS) */
 211         volatile sig_atomic_t need_resize;   /* need to resize UI (SIGWINCH occured) */
 212         volatile sig_atomic_t resume;        /* need to resume UI (SIGCONT occured) */
 213         volatile sig_atomic_t terminate;     /* need to terminate we were being killed by SIGTERM */
 214         sigjmp_buf sigbus_jmpbuf;            /* used to jump back to a known good state in the mainloop after (SIGBUS) */
 215         Map *actions;                        /* registered editor actions / special keys commands */
 216         Array actions_user;                  /* dynamically allocated editor actions */
 217         lua_State *lua;                      /* lua context used for syntax highligthing */
 218         VisEvent *event;
 219         Array operators;
 220         Array motions;
 221         Array textobjects;
 222         Array bindings;
 223 };
 224
 225 enum VisEvents {
 226         VIS_EVENT_INIT,
 227         VIS_EVENT_START,
 228         VIS_EVENT_QUIT,
 229         VIS_EVENT_FILE_OPEN,
 230         VIS_EVENT_FILE_SAVE_PRE,
 231         VIS_EVENT_FILE_SAVE_POST,
 232         VIS_EVENT_FILE_CLOSE,
 233         VIS_EVENT_WIN_OPEN,
 234         VIS_EVENT_WIN_CLOSE,
 235         VIS_EVENT_WIN_HIGHLIGHT,
 236         VIS_EVENT_WIN_STATUS,
 237 };
 238
 239 bool vis_event_emit(Vis*, enum VisEvents, ...);
 240
 241 typedef struct {
 242         char name;
 243         VIS_HELP_DECL(const char *help;)
 244 } MarkDef;
 245
 246 typedef MarkDef RegisterDef;
 247
 248 /** stuff used by multiple of the vis-* files */
 249
 250 extern Mode vis_modes[VIS_MODE_INVALID];
 251 extern const Movement vis_motions[VIS_MOVE_INVALID];
 252 extern const Operator vis_operators[VIS_OP_INVALID];
 253 extern const TextObject vis_textobjects[VIS_TEXTOBJECT_INVALID];
 254 extern const MarkDef vis_marks[VIS_MARK_a];
 255 extern const RegisterDef vis_registers[VIS_REG_a];
 256
 257 void macro_operator_stop(Vis *vis);
 258 void macro_operator_record(Vis *vis);
 259
 260 void vis_do(Vis *vis);
 261 void action_reset(Action*);
 262 size_t vis_text_insert_nl(Vis*, Text*, size_t pos);
 263
 264 Mode *mode_get(Vis*, enum VisMode);
 265 void mode_set(Vis *vis, Mode *new_mode);
 266 Macro *macro_get(Vis *vis, enum VisRegister);
 267
 268 void window_selection_save(Win *win);
 269 Win *window_new_file(Vis*, File*, enum UiOption);
 270
 271 const char *file_name_get(File*);
 272 void file_name_set(File*, const char *name);
 273
 274 bool register_init(Register*);
 275 void register_release(Register*);
 276
 277 void mark_init(Array*);
 278 void mark_release(Array*);
 279
 280 void marklist_init(MarkList*, size_t max);
 281 void marklist_release(MarkList*);
 282
 283 const char *register_get(Vis*, Register*, size_t *len);
 284 const char *register_slot_get(Vis*, Register*, size_t slot, size_t *len);
 285
 286 bool register_put0(Vis*, Register*, const char *data);
 287 bool register_put(Vis*, Register*, const char *data, size_t len);
 288 bool register_slot_put(Vis*, Register*, size_t slot, const char *data, size_t len);
 289
 290 bool register_put_range(Vis*, Register*, Text*, Filerange*);
 291 bool register_slot_put_range(Vis*, Register*, size_t slot, Text*, Filerange*);
 292
 293 size_t vis_register_count(Vis*, Register*);
 294 bool register_resize(Register*, size_t count);
 295
 296 #endif