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midizap/readconfig.c

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/*
Copyright 2013 Eric Messick (FixedImagePhoto.com/Contact)
Copyright 2018 Albert Graef <aggraef@gmail.com>
Read and process the configuration file ~/.midizaprc
Lines starting with # are comments.
Sequence of sections defining translation classes, each section is:
[name] regex
CC<0..127> output # control change
PC<0..127> output # program change
PB output # pitch bend
<A-G>[#b]<0..11> output # note
When focus is on a window whose class or title matches regex, the
following translation class is in effect. An empty regex for the last
class will always match, allowing default translations. Any output
sequences not bound in a matched section will be loaded from the
default section if they are bound there.
Each "[name] regex" line introduces the list of MIDI message
translations for the named translation class. The name is only used
for debugging output, and needn't be unique. The following lines
indicate what output should be produced for the given MIDI messages.
Note that not all MIDI message types are supported right now (no
aftertouch, no system messages), but that subset should be enough to
handle most common use cases. (In any case, adding more message types
should be a piece of cake.)
Note messages are specified using the cutomary notation (note name
A..G, optionally followed by an accidental, # or b, followed by a
(zero-based) MIDI octave number. Note that all MIDI octaves start at
the note C, so B0 comes before C1. C5 denotes middle C, A5 is the
chamber pitch (usually at 440 Hz).
MIDI messages are on channel 1 by default; a suffix of the form
-<1..16> can be used to specify a different MIDI channel. E.g., C3-10
denotes note C3 on MIDI channel 10.
By default, all messages are interpreted in the same way as keys on a
computer keyboard, i.e., they can be "on" ("pressed") or "off"
("released"). For notes, a nonzero velocity means "pressed", zero
"released". Similarly, for control changes any nonzero value
indicates "pressed". Same goes for pitch bends, but in this case 0
denotes the center value (considering pitch bend values as signed
quantities in the range -8192..8191). Again, any nonzero (positive or
negative) value means "pressed", and 0 (the center value) "released".
Finally, while program changes don't actually come in "on"/"off"
pairs, they are treated in the same key-like fashion, assuming that
they are "pressed" and then "released" immediately afterwards.
output is a sequence of one or more key codes with optional up/down
indicators, or strings of printable characters enclosed in double
quotes, separated by whitespace. Sequences may have separate press
and release sequences, separated by the word RELEASE.
Examples:
C5 "qwer"
D5 XK_Right
E5 XK_Alt_L/D XK_Right
F5 "V" XK_Left XK_Page_Up "v"
G5 XK_Alt_L/D "v" XK_Alt_L/U "x" RELEASE "q"
Any keycode can be followed by an optional /D, /U, or /H, indicating
that the key is just going down (without being released), going up,
or going down and being held until the shuttlepro key is released.
So, in general, modifier key codes will be followed by /D, and
precede the keycodes they are intended to modify. If a sequence
requires different sets of modifiers for different keycodes, /U can
be used to release a modifier that was previously pressed with /D.
By default, MIDI messages translate to separate press and release
sequences. At the end of the press sequence, all down keys marked by
/D will be released, and the last key not marked by /D, /U, or /H will
remain pressed. The release sequence will begin by releasing the last
held key. If keys are to be pressed as part of the release sequence,
then any keys marked with /D will be repressed before continuing the
sequence. Keycodes marked with /H remain held between the press and
release sequences.
By marking CC (control change) and PB (pitch bend) messages with a
trailing "+" or "-", they can also be used to report incremental
changes. These work a bit differently from the key press semantics.
Instead of providing separate press and release sequences, the output
of such translations is executed whenever the controller increases or
decreases, respectively. At the end of such sequences, all down keys
will be released. For instance, the following translations output the
letter "a" whenever the volume controller (CC7) is increased, and the
letter "b" if it is decreased. Also, the number of times one of these
keys is output corresponds to the actual change in the controller
value. (Thus, if in the example CC7 increases by 32, say, 32 "a"s
will be output).
CC7+ "a"
CC7+ "b"
CC also has an alternative "incremental" mode which handles relative
control changes encoded in "sign bit" format. Here, a value < 64
denotes an increase, and a value > 64 a decrease (thus the 7th bit is
the sign of the value change). The lower 6 bits then denote the
amount of change (e.g., 2 increments the control by 2, whereas 66
decrements by 2). This format is often used with endless rotary
encoders, such as the jog wheel on some DAW controllers like the
Mackie MCU. It is denoted by using "<" and ">" in lieu of "-" and "+"
as the suffix of the CC message. Example:
CC60< XK_Left
CC60> XK_Right
Furthermore, PB (pitch bends) can have a step size associated with
them. The default step size is 1. To indicate a different step size,
the notation PB[<step size>] is used. E.g., PB[1170] will give you
about 7 steps up and down, which is useful to emulate a shuttle wheel
such as those on the Contour Design devices. Example:
PB[1170]- "j"
PB[1170]+ "l"
Most of the notations for MIDI messages also carry over to the output
side, in order to translate MIDI input to MIDI output. To make this
work, you need to invoke the midizap program with the -t option, which
equips the program with an additional MIDI output port, to which the
translated MIDI messages are sent. (Otherwise, MIDI messages in the
output translations will be ignored.)
Note that on output, the "+" and "-" suffixes aren't supported,
because the *input* message determines whether it is a key press or
value change type of event, and which direction it goes in the latter
case. Also, "~" is used in lieu of "<" or ">" to indicate an
incremental CC message in sign bit encoding. Finally, there's a
special token of the form CH<1..16>. This doesn't actually generate
any MIDI message. Rather, it sets the default MIDI channel for
subsequent MIDI messages in the same output sequence, which is
convenient if multiple messages are output to the same MIDI channel.
Bindings can involve as many MIDI messages as you want, and these can
be combined freely with keypress events in any order. There's no
limitation on the type or number of MIDI messages that you can put
into a binding.
*/
#include "midizap.h"
int default_debug_regex = 0;
int default_debug_strokes = 0;
int default_debug_keys = 0;
int debug_regex = 0;
int debug_strokes = 0;
int debug_keys = 0;
char *
allocate(size_t len)
{
char *ret = (char *)calloc(1, len);
if (ret == NULL) {
fprintf(stderr, "Out of memory!\n");
exit(1);
}
return ret;
}
char *
alloc_strcat(char *a, char *b)
{
size_t len = 0;
char *result;
if (a != NULL) {
len += strlen(a);
}
if (b != NULL) {
len += strlen(b);
}
result = allocate(len+1);
result[0] = '\0';
if (a != NULL) {
strcpy(result, a);
}
if (b != NULL) {
strcat(result, b);
}
return result;
}
static char *read_line_buffer = NULL;
static int read_line_buffer_length = 0;
#define BUF_GROWTH_STEP 1024
// read a line of text from the given file into a managed buffer.
// returns a partial line at EOF if the file does not end with \n.
// exits with error message on read error.
char *
read_line(FILE *f, char *name)
{
int pos = 0;
char *new_buffer;
int new_buffer_length;
if (read_line_buffer == NULL) {
read_line_buffer_length = BUF_GROWTH_STEP;
read_line_buffer = allocate(read_line_buffer_length);
read_line_buffer[0] = '\0';
}
while (1) {
read_line_buffer[read_line_buffer_length-1] = '\377';
if (fgets(read_line_buffer+pos, read_line_buffer_length-pos, f) == NULL) {
if (feof(f)) {
if (pos > 0) {
// partial line at EOF
return read_line_buffer;
} else {
return NULL;
}
}
perror(name);
exit(1);
}
if (read_line_buffer[read_line_buffer_length-1] != '\0') {
return read_line_buffer;
}
if (read_line_buffer[read_line_buffer_length-2] == '\n') {
return read_line_buffer;
}
new_buffer_length = read_line_buffer_length + BUF_GROWTH_STEP;
new_buffer = allocate(new_buffer_length);
memcpy(new_buffer, read_line_buffer, read_line_buffer_length);
free(read_line_buffer);
pos = read_line_buffer_length-1;
read_line_buffer = new_buffer;
read_line_buffer_length = new_buffer_length;
}
}
static translation *first_translation_section = NULL;
static translation *last_translation_section = NULL;
translation *default_translation;
translation *
new_translation_section(char *name, char *regex)
{
translation *ret = (translation *)allocate(sizeof(translation));
int err;
memset(ret, 0, sizeof(translation));
if (debug_strokes) {
printf("------------------------\n[%s] %s\n\n", name, regex);
}
ret->next = NULL;
ret->name = alloc_strcat(name, NULL);
if (regex == NULL || *regex == '\0') {
ret->is_default = 1;
default_translation = ret;
} else {
ret->is_default = 0;
err = regcomp(&ret->regex, regex, REG_NOSUB);
if (err != 0) {
regerror(err, &ret->regex, read_line_buffer, read_line_buffer_length);
fprintf(stderr, "error compiling regex for [%s]: %s\n", name, read_line_buffer);
regfree(&ret->regex);
free(ret->name);
free(ret);
return NULL;
}
}
if (first_translation_section == NULL) {
first_translation_section = ret;
last_translation_section = ret;
} else {
last_translation_section->next = ret;
last_translation_section = ret;
}
return ret;
}
void
free_strokes(stroke *s)
{
stroke *next;
while (s != NULL) {
next = s->next;
free(s);
s = next;
}
}
void
free_translation_section(translation *tr)
{
int i, j;
if (tr != NULL) {
free(tr->name);
if (!tr->is_default) {
regfree(&tr->regex);
}
for (i=0; i<NUM_CHAN; i++) {
for (j=0; j<NUM_KEYS; j++) {
free_strokes(tr->pc[i][j][0]);
free_strokes(tr->pc[i][j][1]);
free_strokes(tr->note[i][j][0]);
free_strokes(tr->note[i][j][1]);
free_strokes(tr->cc[i][j][0]);
free_strokes(tr->cc[i][j][1]);
free_strokes(tr->ccs[i][j][0]);
free_strokes(tr->ccs[i][j][1]);
}
free_strokes(tr->pb[i][0]);
free_strokes(tr->pb[i][1]);
free_strokes(tr->pbs[i][0]);
free_strokes(tr->pbs[i][1]);
}
free(tr);
}
}
void
free_all_translations(void)
{
translation *tr = first_translation_section;
translation *next;
while (tr != NULL) {
next = tr->next;
free_translation_section(tr);
tr = next;
}
first_translation_section = NULL;
last_translation_section = NULL;
}
char *config_file_name = NULL;
static time_t config_file_modification_time;
static char *token_src = NULL;
// similar to strtok, but it tells us what delimiter was found at the
// end of the token, handles double quoted strings specially, and
// hardcodes the delimiter set.
char *
token(char *src, char *delim_found)
{
char *delims = " \t\n/\"";
char *d;
char *token_start;
if (src == NULL) {
src = token_src;
}
if (src == NULL) {
*delim_found = '\0';
return NULL;
}
token_start = src;
while (*src) {
d = delims;
while (*d && *src != *d) {
d++;
}
if (*d) {
if (src == token_start) {
src++;
token_start = src;
if (*d == '"') {
while (*src && *src != '"' && *src != '\n') {
src++;
}
} else {
continue;
}
}
*delim_found = *d;
if (*src) {
*src = '\0';
token_src = src+1;
} else {
token_src = NULL;
}
return token_start;
}
src++;
}
token_src = NULL;
*delim_found = '\0';
if (src == token_start) {
return NULL;
}
return token_start;
}
typedef struct _keysymmapping {
char *str;
KeySym sym;
} keysymmapping;
static keysymmapping key_sym_mapping[] = {
#include "keys.h"
{ "XK_Button_1", XK_Button_1 },
{ "XK_Button_2", XK_Button_2 },
{ "XK_Button_3", XK_Button_3 },
{ "XK_Scroll_Up", XK_Scroll_Up },
{ "XK_Scroll_Down", XK_Scroll_Down },
{ NULL, 0 }
};
KeySym
string_to_KeySym(char *str)
{
size_t len = strlen(str) + 1;
int i = 0;
while (key_sym_mapping[i].str != NULL) {
if (!strncmp(str, key_sym_mapping[i].str, len)) {
return key_sym_mapping[i].sym;
}
i++;
}
return 0;
}
char *
KeySym_to_string(KeySym ks)
{
int i = 0;
while (key_sym_mapping[i].sym != 0) {
if (key_sym_mapping[i].sym == ks) {
return key_sym_mapping[i].str;
}
i++;
}
return NULL;
}
static char *note_names[] = { "C", "C#", "D", "Eb", "E", "F", "F#", "G", "G#", "A", "Bb", "B" };
void
print_stroke(stroke *s)
{
char *str;
if (s != NULL) {
if (s->keysym) {
str = KeySym_to_string(s->keysym);
if (str == NULL) {
printf("0x%x", (int)s->keysym);
str = "???";
}
printf("%s/%c ", str, s->press ? 'D' : 'U');
} else {
int status = s->status & 0xf0;
int channel = (s->status & 0x0f) + 1;
switch (status) {
case 0x90:
printf("%s%d-%d ", note_names[s->data % 12], s->data / 12, channel);
break;
case 0xb0:
printf("CC%d-%d%s ", s->data, channel, s->incr?"~":"");
break;
case 0xc0:
printf("PC%d-%d ", s->data, channel);
break;
case 0xe0:
printf("PB-%d ", channel);
break;
default: // this can't happen
break;
}
}
}
}
void
print_stroke_sequence(char *name, char *up_or_down, stroke *s)
{
printf("%s[%s]: ", name, up_or_down);
while (s) {
print_stroke(s);
s = s->next;
}
printf("\n");
}
stroke **first_stroke;
stroke *last_stroke;
stroke **press_first_stroke;
stroke **release_first_stroke;
int is_keystroke;
int is_midi;
char *current_translation;
char *key_name;
int first_release_stroke; // is this the first stroke of a release?
KeySym regular_key_down;
#define NUM_MODIFIERS 64
stroke modifiers_down[NUM_MODIFIERS];
int modifier_count;
int midi_channel;
void
append_stroke(KeySym sym, int press)
{
stroke *s = (stroke *)allocate(sizeof(stroke));
s->next = NULL;
s->keysym = sym;
s->press = press;
s->status = s->data = s->step = s->incr = s->dirty = 0;
if (*first_stroke) {
last_stroke->next = s;
} else {
*first_stroke = s;
}
last_stroke = s;
}
void
append_midi(int status, int data, int step, int incr)
{
stroke *s = (stroke *)allocate(sizeof(stroke));
s->next = NULL;
s->keysym = 0;
s->press = 0;
s->status = status;
s->data = data;
s->step = step;
s->incr = incr;
// if this is a keystroke event, for all messages but program change (which
// has no "on" and "off" states), mark the event as "dirty" so that the
// corresponding "off" event gets added later to the "release" strokes
s->dirty = is_keystroke && ((status&0xf0) != 0xc0);
if (*first_stroke) {
last_stroke->next = s;
} else {
*first_stroke = s;
}
last_stroke = s;
is_midi = 1;
}
// s->press values in modifiers_down:
// PRESS -> down
// HOLD -> held
// PRESS_RELEASE -> released, but to be re-pressed if necessary
// RELEASE -> up
void
mark_as_down(KeySym sym, int hold)
{
int i;
for (i=0; i<modifier_count; i++) {
if (modifiers_down[i].keysym == sym) {
modifiers_down[i].press = hold ? HOLD : PRESS;
return;
}
}
if (modifier_count > NUM_MODIFIERS) {
fprintf(stderr, "too many modifiers down in [%s]%s\n", current_translation, key_name);
return;
}
modifiers_down[modifier_count].keysym = sym;
modifiers_down[modifier_count].press = hold ? HOLD : PRESS;
modifier_count++;
}
void
mark_as_up(KeySym sym)
{
int i;
for (i=0; i<modifier_count; i++) {
if (modifiers_down[i].keysym == sym) {
modifiers_down[i].press = RELEASE;
return;
}
}
}
void
release_modifiers(int allkeys)
{
int i;
for (i=0; i<modifier_count; i++) {
if (modifiers_down[i].press == PRESS) {
append_stroke(modifiers_down[i].keysym, 0);
modifiers_down[i].press = PRESS_RELEASE;
} else if (allkeys && modifiers_down[i].press == HOLD) {
append_stroke(modifiers_down[i].keysym, 0);
modifiers_down[i].press = RELEASE;
}
}
}
void
re_press_temp_modifiers(void)
{
int i;
for (i=0; i<modifier_count; i++) {
if (modifiers_down[i].press == PRESS_RELEASE) {
append_stroke(modifiers_down[i].keysym, 1);
modifiers_down[i].press = PRESS;
}
}
}
/* Parser for the MIDI message syntax. The syntax we actually parse here is:
tok ::= ( note | msg ) [number] [ "-" number] [incr]
note ::= ( "a" | ... | "g" ) [ "#" | "b" ]
msg ::= "ch" | "pb" [ "[" number "]" ] | "pc" | "cc"
incr ::= "-" | "+" | "<" | ">" | "~"
Numbers are always in decimal. The meaning of the first number depends on
the context (octave number for notes, the actual data byte for other
messages). If present, the suffix with the second number (after the dash)
denotes the MIDI channel, otherwise the default MIDI channel is used. Note
that not all combinations are possible -- "pb" is *not* followed by a data
byte, but may be followed by a step size in brackets; and "ch" must *not*
occur as the first token and must *not* have a channel number suffix on
it. (In fact, "ch" is no real MIDI message at all; it just sets the default
MIDI channel for subsequent messages in the output sequence.) The incr flag
is only permitted in conjunction with "pb" or "cc", and it takes on a
different form in the first token of a translation. */
static int note_number(char c, char b, int k)
{
c = tolower(c); b = tolower(b);
if (c < 'a' || c > 'g' || (b && b != '#' && b != 'b'))
return -1; // either wrong note name or invalid accidental
else {
static int note_numbers[] = { -3, -1, 0, 2, 4, 5, 7 };
int m = note_numbers[c-'a'], a = (b=='#')?1:(b=='b')?-1:0;
if (m<0) k++;
return m + a + 12*k;
}
}
int
parse_midi(char *tok, char *s, int lhs,
int *status, int *data, int *step, int *incr)
{
char *p = tok, *t;
int n, m = -1, k = midi_channel, l;
s[0] = 0;
while (*p && !isdigit(*p) && !strchr("+-<>[", *p)) p++;
if (p == tok || p-tok > 10) return 0; // no valid token
// the token by itself
strncpy(s, tok, p-tok); s[p-tok] = 0;
// normalize to lowercase
for (t = s; *t; t++) *t = tolower(*t);
// octave number or data byte (not permitted with 'pb', otherwise required)
if (isdigit(*p) && sscanf(p, "%d%n", &m, &n) == 1) {
if (strcmp(s, "pb") == 0) return 0;
p += n;
} else if (strcmp(s, "pb")) {
return 0;
}
// step size ('pb' only)
if (*p == '[') {
if (strcmp(s, "pb")) return 0;
if (sscanf(++p, "%d%n", &l, &n) == 1) {
p += n;
if (*p != ']') return 0;
p++;
*step = l;
} else {
return 0;
}
} else if (strcmp(s, "pb") == 0) {
*step = 1;
}
if (p[0] == '-' && isdigit(p[1])) {
// suffix with MIDI channel (not permitted with 'ch')
if (strcmp(s, "ch") == 0) return 0;
if (sscanf(++p, "%d%n", &k, &n) == 1) {
// check that it is a valid channel number
if (k < 1 || k > 16) return 0;
k--; // actual MIDI channel in the range 0..15
p += n;
} else {
return 0;
}
}
if (*p && strchr("+-<>~", *p)) {
// incremental flag ("pb" and "cc" only)
if (strcmp(s, "pb") && strcmp(s, "cc")) return 0;
if ((*p == '<' || *p == '>' || *p == '~') && strcmp(s, "cc")) return 0;
// Only the "~" form is permitted in output messages, and the other forms
// are only permitted on the lhs of a translation. XXXFIXME: This is
// confusing; incr is just a single bit in output messages, whereas it can
// take on various different values on the lhs.
if (lhs) {
if (*p == '~') return 0;
*incr = (*p == '-')?0:(*p == '+')?1:(*p == '<')?2:3;
} else {
if (*p != '~') return 0;
*incr = 1;
}
p++;
} else {
*incr = lhs?-1:0;
}
// check for trailing garbage
if (*p) return 0;
if (strcmp(s, "ch") == 0) {
if (lhs) return 0;
// we return a bogus status of 0 here, along with the MIDI channel in the
// data byte; also check that the MIDI channel is in the proper range
if (m < 1 || m > 16) return 0;
*status = 0; *data = m-1;
return 1;
} else if (strcmp(s, "pb") == 0) {
// pitch bend, no data byte
*status = 0xe0 | k; *data = 0;
return 1;
} else if (strcmp(s, "pc") == 0) {
// program change
if (m < 0 || m > 127) return 0;
*status = 0xc0 | k; *data = m;
return 1;
} else if (strcmp(s, "cc") == 0) {
// control change
if (m < 0 || m > 127) return 0;
*status = 0xb0 | k; *data = m;
return 1;
} else {
// we must be looking at a MIDI note here, with m denoting the octave
// number; first character is the note name (must be a..g); optionally,
// the second character may denote an accidental (# or b)
n = note_number(s[0], s[1], m);
if (n < 0 || n > 127) return 0;
*status = 0x90 | k; *data = n;
return 1;
}
}
int
start_translation(translation *tr, char *which_key)
{
int status, data, step, incr;
char buf[100];
//printf("start_translation(%s)\n", which_key);
if (tr == NULL) {
fprintf(stderr, "need to start translation section before defining key: %s\n", which_key);
return 1;
}
current_translation = tr->name;
key_name = which_key;
is_keystroke = is_midi = 0;
first_release_stroke = 0;
regular_key_down = 0;
modifier_count = 0;
midi_channel = 0;
if (parse_midi(which_key, buf, 1, &status, &data, &step, &incr)) {
int chan = status & 0x0f;
switch (status & 0xf0) {
case 0x90:
// note on/off
first_stroke = &(tr->note[chan][data][0]);
release_first_stroke = &(tr->note[chan][data][1]);
is_keystroke = 1;
break;
case 0xc0:
// pc: To make our live easier and for consistency with the other
// messages, we treat this exactly like a note/cc on/off, even though
// this message has no off state. Thus, when we receive a pc, it's
// supposed to be treated as a "down" sequence immediately followed by
// the corresponding "up" sequence.
first_stroke = &(tr->pc[chan][data][0]);
release_first_stroke = &(tr->pc[chan][data][1]);
is_keystroke = 1;
break;
case 0xb0:
if (incr == -1) {
// cc on/off
first_stroke = &(tr->cc[chan][data][0]);
release_first_stroke = &(tr->cc[chan][data][1]);
is_keystroke = 1;
} else {
// cc (step up, down)
tr->is_incr[chan][data] = incr/2 != 0;
first_stroke = &(tr->ccs[chan][data][incr%2]);
}
break;
case 0xe0:
if (incr == -1) {
// pb on/off
first_stroke = &(tr->pb[chan][0]);
release_first_stroke = &(tr->pb[chan][1]);
is_keystroke = 1;
} else {
// pb (step up, down)
if (step <= 0) {
fprintf(stderr, "zero or negative step size not permitted here: [%s]%s\n", current_translation, which_key);
return 1;
}
first_stroke = &(tr->pbs[chan][incr]);
tr->step[chan][incr] = step;
}
break;
default:
// this can't happen
fprintf(stderr, "bad message name: [%s]%s\n", current_translation, which_key);
return 1;
}
} else {
fprintf(stderr, "bad message name: [%s]%s\n", current_translation, which_key);
return 1;
}
if (*first_stroke != NULL) {
fprintf(stderr, "can't redefine message: [%s]%s\n", current_translation, which_key);
return 1;
}
press_first_stroke = first_stroke;
return 0;
}
void
add_keysym(KeySym sym, int press_release)
{
//printf("add_keysym(0x%x, %d)\n", (int)sym, press_release);
switch (press_release) {
case PRESS:
append_stroke(sym, 1);
mark_as_down(sym, 0);
break;
case RELEASE:
append_stroke(sym, 0);
mark_as_up(sym);
break;
case HOLD:
append_stroke(sym, 1);
mark_as_down(sym, 1);
break;
case PRESS_RELEASE:
default:
if (first_release_stroke) {
re_press_temp_modifiers();
}
if (regular_key_down != 0) {
append_stroke(regular_key_down, 0);
}
append_stroke(sym, 1);
regular_key_down = sym;
first_release_stroke = 0;
break;
}
}
void
add_release(int all_keys)
{
//printf("add_release(%d)\n", all_keys);
release_modifiers(all_keys);
if (!all_keys) {
first_stroke = release_first_stroke;
if (is_midi) {
// walk the list of "press" strokes, find all "dirty" (as yet unhandled)
// MIDI events in there and add them to the "release" strokes
stroke *s = *press_first_stroke;
while (s) {
if (!s->keysym && s->dirty) {
append_midi(s->status, s->data, s->step, s->incr);
s->dirty = 0;
}
s = s->next;
}
}
}
if (regular_key_down != 0) {
append_stroke(regular_key_down, 0);
}
regular_key_down = 0;
first_release_stroke = 1;
}
void
add_keystroke(char *keySymName, int press_release)
{
KeySym sym;
if (is_keystroke && !strncmp(keySymName, "RELEASE", 8)) {
add_release(0);
return;
}
sym = string_to_KeySym(keySymName);
if (sym != 0) {
add_keysym(sym, press_release);
} else {
fprintf(stderr, "unrecognized KeySym: %s\n", keySymName);
}
}
void
add_string(char *str)
{
while (str && *str) {
if (*str >= ' ' && *str <= '~') {
add_keysym((KeySym)(*str), PRESS_RELEASE);
}
str++;
}
}
void
add_midi(char *tok)
{
int status, data, step, incr = 0;
char buf[100];
if (parse_midi(tok, buf, 0, &status, &data, &step, &incr)) {
if (status == 0) {
// 'ch' token; this doesn't actually generate any output, it just sets
// the default MIDI channel
midi_channel = data;
} else {
if ((status & 0xf0) != 0xe0 || step != 0)
append_midi(status, data, step, incr);
else
fprintf(stderr, "zero step size not permitted: %s\n", tok);
}
} else {
// inspect the token that was actually recognized (if any) to give some
// useful error message here
if (strcmp(buf, "ch"))
fprintf(stderr, "bad MIDI message: %s\n", tok);
else
fprintf(stderr, "bad MIDI channel: %s\n", tok);
}
}
void
finish_translation(void)
{
//printf("finish_translation()\n");
if (is_keystroke) {
add_release(0);
}
add_release(1);
if (debug_strokes) {
if (is_keystroke) {
print_stroke_sequence(key_name, "D", *press_first_stroke);
print_stroke_sequence(key_name, "U", *release_first_stroke);
} else {
print_stroke_sequence(key_name, "", *first_stroke);
}
printf("\n");
}
}
int
read_config_file(void)
{
struct stat buf;
char *home;
char *line;
char *s;
char *name = NULL;
char *regex;
char *tok;
char *which_key;
char *updown;
char delim;
translation *tr = NULL;
FILE *f;
int config_file_default = 0;
static int errors = 0;
if (config_file_name == NULL) {
config_file_name = getenv("MIDIZAP_CONFIG_FILE");
if (config_file_name == NULL) {
home = getenv("HOME");
config_file_name = alloc_strcat(home, "/.midizaprc");
config_file_default = 1;
} else {
config_file_name = alloc_strcat(config_file_name, NULL);
}
config_file_modification_time = 0;
}
if (stat(config_file_name, &buf) < 0) {
// AG: Fall back to the system-wide configuration file.
if (!config_file_default && !errors) {
perror(config_file_name);
errors++;
}
config_file_name = "/etc/midizaprc";
config_file_modification_time = 0;
}
if (stat(config_file_name, &buf) < 0) {
if (!errors) {
perror(config_file_name);
errors++;
}
return 0;
}
if (buf.st_mtime == 0) {
buf.st_mtime = 1;
}
if (buf.st_mtime > config_file_modification_time) {
config_file_modification_time = buf.st_mtime;
if (default_debug_regex || default_debug_strokes || default_debug_keys) {
printf("Loading configuration: %s\n", config_file_name);
}
f = fopen(config_file_name, "r");
if (f == NULL) {
if (!errors) {
perror(config_file_name);
errors++;
}
return 0;
}
free_all_translations();
debug_regex = default_debug_regex;
debug_strokes = default_debug_strokes;
debug_keys = default_debug_keys;
while ((line=read_line(f, config_file_name)) != NULL) {
//printf("line: %s", line);
s = line;
while (*s && isspace(*s)) {
s++;
}
if (*s == '#') {
continue;
}
if (*s == '[') {
// [name] regex\n
name = ++s;
while (*s && *s != ']') {
s++;
}
regex = NULL;
if (*s) {
*s = '\0';
s++;
while (*s && isspace(*s)) {
s++;
}
regex = s;
while (*s) {
s++;
}
s--;
while (s > regex && isspace(*s)) {
s--;
}
s[1] = '\0';
}
tr = new_translation_section(name, regex);
continue;
}
tok = token(s, &delim);
if (tok == NULL) {
continue;
}
if (!strcmp(tok, "DEBUG_REGEX")) {
debug_regex = 1;
continue;
}
if (!strcmp(tok, "DEBUG_STROKES")) {
debug_strokes = 1;
continue;
}
if (!strcmp(tok, "DEBUG_KEYS")) {
debug_keys = 1;
continue;
}
which_key = tok;
if (start_translation(tr, which_key)) {
continue;
}
tok = token(NULL, &delim);
while (tok != NULL) {
if (delim != '"' && tok[0] == '#') {
break; // skip rest as comment
}
//printf("token: [%s] delim [%d]\n", tok, delim);
switch (delim) {
case ' ':
case '\t':
case '\n':
if (strncmp(tok, "XK", 2) && strncmp(tok, "RELEASE", 8))
add_midi(tok);
else
add_keystroke(tok, PRESS_RELEASE);
break;
case '"':
add_string(tok);
break;
default: // should be slash
updown = token(NULL, &delim);
if (updown != NULL) {
switch (updown[0]) {
case 'U':
add_keystroke(tok, RELEASE);
break;
case 'D':
add_keystroke(tok, PRESS);
break;
case 'H':
add_keystroke(tok, HOLD);
break;
default:
fprintf(stderr, "invalid up/down modifier [%s]%s: %s\n", name, which_key, updown);
add_keystroke(tok, PRESS);
break;
}
}
}
tok = token(NULL, &delim);
}
finish_translation();
}
fclose(f);
return 1;
} else {
return 0;
}
}
translation *
get_translation(char *win_title, char *win_class)
{
translation *tr;
read_config_file();
tr = first_translation_section;
while (tr != NULL) {
extern int enable_jack_output;
if (tr->is_default &&
(strcmp(tr->name, "MIDI") || enable_jack_output)) {
return tr;
} else if (!tr->is_default) {
// AG: We first try to match the class name, since it usually provides
// better identification clues.
if (win_class && *win_class &&
regexec(&tr->regex, win_class, 0, NULL, 0) == 0) {
return tr;
}
if (regexec(&tr->regex, win_title, 0, NULL, 0) == 0) {
return tr;
}
}
tr = tr->next;
}
return NULL;
}
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