source:
history.c
@
faf71b5
Last change on this file since faf71b5 was 70b53ec, checked in by James M. Kretchmar <kretch@mit.edu>, 20 years ago | |
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File size: 1.6 KB |
Rev | Line | |
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[7d4fbcd] | 1 | #include "owl.h" |
2 | ||
[1aee7d9] | 3 | static const char fileIdent[] = "$Id$"; |
4 | ||
[70b53ec] | 5 | void owl_history_init(owl_history *h) |
6 | { | |
[7d4fbcd] | 7 | owl_list_create(&(h->hist)); |
[10b866d] | 8 | h->cur=0; /* current position in history */ |
9 | h->touched=0; /* whether we've gone into history */ | |
10 | h->partial=0; /* is the 0th element is partially composed? */ | |
[7d4fbcd] | 11 | } |
12 | ||
[70b53ec] | 13 | char *owl_history_get_prev(owl_history *h) |
14 | { | |
[10b866d] | 15 | |
16 | if (!h) return NULL; | |
[7d4fbcd] | 17 | h->touched=1; |
18 | ||
19 | if (owl_list_get_size(&(h->hist))==0) return(NULL); | |
20 | ||
21 | if (h->cur == owl_list_get_size(&(h->hist))-1) { | |
22 | return(NULL); | |
23 | } | |
24 | ||
25 | h->cur++; | |
[10b866d] | 26 | |
[7d4fbcd] | 27 | return(owl_list_get_element(&(h->hist), h->cur)); |
28 | } | |
29 | ||
[70b53ec] | 30 | char *owl_history_get_next(owl_history *h) |
31 | { | |
[10b866d] | 32 | if (!h) return NULL; |
[7d4fbcd] | 33 | if (owl_list_get_size(&(h->hist))==0) return(NULL); |
34 | if (h->cur==0) { | |
35 | return(NULL); | |
36 | } | |
37 | ||
38 | h->cur--; | |
39 | return(owl_list_get_element(&(h->hist), h->cur)); | |
40 | } | |
41 | ||
[70b53ec] | 42 | void owl_history_store(owl_history *h, char *line) |
43 | { | |
[7d4fbcd] | 44 | int size; |
45 | ||
[10b866d] | 46 | if (!h) return; |
47 | ||
[7d4fbcd] | 48 | /* if partial is set, remove the first entry first */ |
49 | if (h->partial) { | |
50 | owl_list_remove_element(&(h->hist), 0); | |
51 | } | |
[10b866d] | 52 | |
[7d4fbcd] | 53 | /* if we've reached the max history size, pop off the last element */ |
54 | size=owl_list_get_size(&(h->hist)); | |
55 | if (size>OWL_HISTORYSIZE) { | |
56 | owl_free(owl_list_get_element(&(h->hist), size-1)); | |
57 | owl_list_remove_element(&(h->hist), size-1); | |
58 | } | |
59 | ||
60 | /* add the new line */ | |
61 | owl_list_prepend_element(&(h->hist), owl_strdup(line)); | |
62 | } | |
63 | ||
[70b53ec] | 64 | void owl_history_set_partial(owl_history *h) |
65 | { | |
[10b866d] | 66 | if (!h) return; |
[7d4fbcd] | 67 | h->partial=1; |
68 | } | |
69 | ||
[70b53ec] | 70 | void owl_history_reset(owl_history *h) |
71 | { | |
[10b866d] | 72 | if (!h) return; |
[7d4fbcd] | 73 | h->cur=0; |
74 | h->touched=0; | |
75 | h->partial=0; | |
76 | } | |
77 | ||
[70b53ec] | 78 | int owl_history_is_touched(owl_history *h) |
79 | { | |
[10b866d] | 80 | if (!h) return(0); |
[7d4fbcd] | 81 | if (h->touched) return(1); |
82 | return(0); | |
83 | } |
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