"rebase -i": support special-purpose editor to edit insn sheet
[gitweb.git] / convert.c
index efc7e07d475c66f7835dc6cbbd3bc358f01c41c3..3bb5a4dd57c669bc59be0e2317ef33b64b024992 100644 (file)
--- a/convert.c
+++ b/convert.c
@@ -533,7 +533,7 @@ static int ident_to_git(const char *path, const char *src, size_t len,
                dollar = memchr(src, '$', len);
                if (!dollar)
                        break;
-               memcpy(dst, src, dollar + 1 - src);
+               memmove(dst, src, dollar + 1 - src);
                dst += dollar + 1 - src;
                len -= dollar + 1 - src;
                src  = dollar + 1;
@@ -553,7 +553,7 @@ static int ident_to_git(const char *path, const char *src, size_t len,
                        src  = dollar + 1;
                }
        }
-       memcpy(dst, src, len);
+       memmove(dst, src, len);
        strbuf_setlen(buf, dst + len - buf->buf);
        return 1;
 }
@@ -727,7 +727,7 @@ static void convert_attrs(struct conv_attrs *ca, const char *path)
                git_config(read_convert_config, NULL);
        }
 
-       if (!git_checkattr(path, NUM_CONV_ATTRS, ccheck)) {
+       if (!git_check_attr(path, NUM_CONV_ATTRS, ccheck)) {
                ca->crlf_action = git_path_check_crlf(path, ccheck + 4);
                if (ca->crlf_action == CRLF_GUESS)
                        ca->crlf_action = git_path_check_crlf(path, ccheck + 0);
@@ -813,3 +813,400 @@ int renormalize_buffer(const char *path, const char *src, size_t len, struct str
        }
        return ret | convert_to_git(path, src, len, dst, 0);
 }
+
+/*****************************************************************
+ *
+ * Streaming converison support
+ *
+ *****************************************************************/
+
+typedef int (*filter_fn)(struct stream_filter *,
+                        const char *input, size_t *isize_p,
+                        char *output, size_t *osize_p);
+typedef void (*free_fn)(struct stream_filter *);
+
+struct stream_filter_vtbl {
+       filter_fn filter;
+       free_fn free;
+};
+
+struct stream_filter {
+       struct stream_filter_vtbl *vtbl;
+};
+
+static int null_filter_fn(struct stream_filter *filter,
+                         const char *input, size_t *isize_p,
+                         char *output, size_t *osize_p)
+{
+       size_t count;
+
+       if (!input)
+               return 0; /* we do not keep any states */
+       count = *isize_p;
+       if (*osize_p < count)
+               count = *osize_p;
+       if (count) {
+               memmove(output, input, count);
+               *isize_p -= count;
+               *osize_p -= count;
+       }
+       return 0;
+}
+
+static void null_free_fn(struct stream_filter *filter)
+{
+       ; /* nothing -- null instances are shared */
+}
+
+static struct stream_filter_vtbl null_vtbl = {
+       null_filter_fn,
+       null_free_fn,
+};
+
+static struct stream_filter null_filter_singleton = {
+       &null_vtbl,
+};
+
+int is_null_stream_filter(struct stream_filter *filter)
+{
+       return filter == &null_filter_singleton;
+}
+
+
+/*
+ * LF-to-CRLF filter
+ */
+static int lf_to_crlf_filter_fn(struct stream_filter *filter,
+                               const char *input, size_t *isize_p,
+                               char *output, size_t *osize_p)
+{
+       size_t count;
+
+       if (!input)
+               return 0; /* we do not keep any states */
+       count = *isize_p;
+       if (count) {
+               size_t i, o;
+               for (i = o = 0; o < *osize_p && i < count; i++) {
+                       char ch = input[i];
+                       if (ch == '\n') {
+                               if (o + 1 < *osize_p)
+                                       output[o++] = '\r';
+                               else
+                                       break;
+                       }
+                       output[o++] = ch;
+               }
+
+               *osize_p -= o;
+               *isize_p -= i;
+       }
+       return 0;
+}
+
+static struct stream_filter_vtbl lf_to_crlf_vtbl = {
+       lf_to_crlf_filter_fn,
+       null_free_fn,
+};
+
+static struct stream_filter lf_to_crlf_filter_singleton = {
+       &lf_to_crlf_vtbl,
+};
+
+
+/*
+ * Cascade filter
+ */
+#define FILTER_BUFFER 1024
+struct cascade_filter {
+       struct stream_filter filter;
+       struct stream_filter *one;
+       struct stream_filter *two;
+       char buf[FILTER_BUFFER];
+       int end, ptr;
+};
+
+static int cascade_filter_fn(struct stream_filter *filter,
+                            const char *input, size_t *isize_p,
+                            char *output, size_t *osize_p)
+{
+       struct cascade_filter *cas = (struct cascade_filter *) filter;
+       size_t filled = 0;
+       size_t sz = *osize_p;
+       size_t to_feed, remaining;
+
+       /*
+        * input -- (one) --> buf -- (two) --> output
+        */
+       while (filled < sz) {
+               remaining = sz - filled;
+
+               /* do we already have something to feed two with? */
+               if (cas->ptr < cas->end) {
+                       to_feed = cas->end - cas->ptr;
+                       if (stream_filter(cas->two,
+                                         cas->buf + cas->ptr, &to_feed,
+                                         output + filled, &remaining))
+                               return -1;
+                       cas->ptr += (cas->end - cas->ptr) - to_feed;
+                       filled = sz - remaining;
+                       continue;
+               }
+
+               /* feed one from upstream and have it emit into our buffer */
+               to_feed = input ? *isize_p : 0;
+               if (input && !to_feed)
+                       break;
+               remaining = sizeof(cas->buf);
+               if (stream_filter(cas->one,
+                                 input, &to_feed,
+                                 cas->buf, &remaining))
+                       return -1;
+               cas->end = sizeof(cas->buf) - remaining;
+               cas->ptr = 0;
+               if (input) {
+                       size_t fed = *isize_p - to_feed;
+                       *isize_p -= fed;
+                       input += fed;
+               }
+
+               /* do we know that we drained one completely? */
+               if (input || cas->end)
+                       continue;
+
+               /* tell two to drain; we have nothing more to give it */
+               to_feed = 0;
+               remaining = sz - filled;
+               if (stream_filter(cas->two,
+                                 NULL, &to_feed,
+                                 output + filled, &remaining))
+                       return -1;
+               if (remaining == (sz - filled))
+                       break; /* completely drained two */
+               filled = sz - remaining;
+       }
+       *osize_p -= filled;
+       return 0;
+}
+
+static void cascade_free_fn(struct stream_filter *filter)
+{
+       struct cascade_filter *cas = (struct cascade_filter *)filter;
+       free_stream_filter(cas->one);
+       free_stream_filter(cas->two);
+       free(filter);
+}
+
+static struct stream_filter_vtbl cascade_vtbl = {
+       cascade_filter_fn,
+       cascade_free_fn,
+};
+
+static struct stream_filter *cascade_filter(struct stream_filter *one,
+                                           struct stream_filter *two)
+{
+       struct cascade_filter *cascade;
+
+       if (!one || is_null_stream_filter(one))
+               return two;
+       if (!two || is_null_stream_filter(two))
+               return one;
+
+       cascade = xmalloc(sizeof(*cascade));
+       cascade->one = one;
+       cascade->two = two;
+       cascade->end = cascade->ptr = 0;
+       cascade->filter.vtbl = &cascade_vtbl;
+       return (struct stream_filter *)cascade;
+}
+
+/*
+ * ident filter
+ */
+#define IDENT_DRAINING (-1)
+#define IDENT_SKIPPING (-2)
+struct ident_filter {
+       struct stream_filter filter;
+       struct strbuf left;
+       int state;
+       char ident[45]; /* ": x40 $" */
+};
+
+static int is_foreign_ident(const char *str)
+{
+       int i;
+
+       if (prefixcmp(str, "$Id: "))
+               return 0;
+       for (i = 5; str[i]; i++) {
+               if (isspace(str[i]) && str[i+1] != '$')
+                       return 1;
+       }
+       return 0;
+}
+
+static void ident_drain(struct ident_filter *ident, char **output_p, size_t *osize_p)
+{
+       size_t to_drain = ident->left.len;
+
+       if (*osize_p < to_drain)
+               to_drain = *osize_p;
+       if (to_drain) {
+               memcpy(*output_p, ident->left.buf, to_drain);
+               strbuf_remove(&ident->left, 0, to_drain);
+               *output_p += to_drain;
+               *osize_p -= to_drain;
+       }
+       if (!ident->left.len)
+               ident->state = 0;
+}
+
+static int ident_filter_fn(struct stream_filter *filter,
+                          const char *input, size_t *isize_p,
+                          char *output, size_t *osize_p)
+{
+       struct ident_filter *ident = (struct ident_filter *)filter;
+       static const char head[] = "$Id";
+
+       if (!input) {
+               /* drain upon eof */
+               switch (ident->state) {
+               default:
+                       strbuf_add(&ident->left, head, ident->state);
+               case IDENT_SKIPPING:
+                       /* fallthru */
+               case IDENT_DRAINING:
+                       ident_drain(ident, &output, osize_p);
+               }
+               return 0;
+       }
+
+       while (*isize_p || (ident->state == IDENT_DRAINING)) {
+               int ch;
+
+               if (ident->state == IDENT_DRAINING) {
+                       ident_drain(ident, &output, osize_p);
+                       if (!*osize_p)
+                               break;
+                       continue;
+               }
+
+               ch = *(input++);
+               (*isize_p)--;
+
+               if (ident->state == IDENT_SKIPPING) {
+                       /*
+                        * Skipping until '$' or LF, but keeping them
+                        * in case it is a foreign ident.
+                        */
+                       strbuf_addch(&ident->left, ch);
+                       if (ch != '\n' && ch != '$')
+                               continue;
+                       if (ch == '$' && !is_foreign_ident(ident->left.buf)) {
+                               strbuf_setlen(&ident->left, sizeof(head) - 1);
+                               strbuf_addstr(&ident->left, ident->ident);
+                       }
+                       ident->state = IDENT_DRAINING;
+                       continue;
+               }
+
+               if (ident->state < sizeof(head) &&
+                   head[ident->state] == ch) {
+                       ident->state++;
+                       continue;
+               }
+
+               if (ident->state)
+                       strbuf_add(&ident->left, head, ident->state);
+               if (ident->state == sizeof(head) - 1) {
+                       if (ch != ':' && ch != '$') {
+                               strbuf_addch(&ident->left, ch);
+                               ident->state = 0;
+                               continue;
+                       }
+
+                       if (ch == ':') {
+                               strbuf_addch(&ident->left, ch);
+                               ident->state = IDENT_SKIPPING;
+                       } else {
+                               strbuf_addstr(&ident->left, ident->ident);
+                               ident->state = IDENT_DRAINING;
+                       }
+                       continue;
+               }
+
+               strbuf_addch(&ident->left, ch);
+               ident->state = IDENT_DRAINING;
+       }
+       return 0;
+}
+
+static void ident_free_fn(struct stream_filter *filter)
+{
+       struct ident_filter *ident = (struct ident_filter *)filter;
+       strbuf_release(&ident->left);
+       free(filter);
+}
+
+static struct stream_filter_vtbl ident_vtbl = {
+       ident_filter_fn,
+       ident_free_fn,
+};
+
+static struct stream_filter *ident_filter(const unsigned char *sha1)
+{
+       struct ident_filter *ident = xmalloc(sizeof(*ident));
+
+       sprintf(ident->ident, ": %s $", sha1_to_hex(sha1));
+       strbuf_init(&ident->left, 0);
+       ident->filter.vtbl = &ident_vtbl;
+       ident->state = 0;
+       return (struct stream_filter *)ident;
+}
+
+/*
+ * Return an appropriately constructed filter for the path, or NULL if
+ * the contents cannot be filtered without reading the whole thing
+ * in-core.
+ *
+ * Note that you would be crazy to set CRLF, smuge/clean or ident to a
+ * large binary blob you would want us not to slurp into the memory!
+ */
+struct stream_filter *get_stream_filter(const char *path, const unsigned char *sha1)
+{
+       struct conv_attrs ca;
+       enum crlf_action crlf_action;
+       struct stream_filter *filter = NULL;
+
+       convert_attrs(&ca, path);
+
+       if (ca.drv && (ca.drv->smudge || ca.drv->clean))
+               return filter;
+
+       if (ca.ident)
+               filter = ident_filter(sha1);
+
+       crlf_action = input_crlf_action(ca.crlf_action, ca.eol_attr);
+
+       if ((crlf_action == CRLF_BINARY) || (crlf_action == CRLF_INPUT) ||
+           (crlf_action == CRLF_GUESS && auto_crlf == AUTO_CRLF_FALSE))
+               filter = cascade_filter(filter, &null_filter_singleton);
+
+       else if (output_eol(crlf_action) == EOL_CRLF &&
+                !(crlf_action == CRLF_AUTO || crlf_action == CRLF_GUESS))
+               filter = cascade_filter(filter, &lf_to_crlf_filter_singleton);
+
+       return filter;
+}
+
+void free_stream_filter(struct stream_filter *filter)
+{
+       filter->vtbl->free(filter);
+}
+
+int stream_filter(struct stream_filter *filter,
+                 const char *input, size_t *isize_p,
+                 char *output, size_t *osize_p)
+{
+       return filter->vtbl->filter(filter, input, isize_p, output, osize_p);
+}