convert: prepare filter.<driver>.process option

Refactor the existing 'single shot filter mechanism' and prepare the
new 'long running filter mechanism'.

Signed-off-by: Lars Schneider <larsxschneider@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/convert.c b/convert.c
index 597f561e627aea6ac209f942f8a1f0203fb654aa..71e11ffb9a6cbce4aa94d72800e2999ab6399efd 100644 (file)
--- a/convert.c
+++ b/convert.c
@@ -442,7 +442,7 @@ static int filter_buffer_or_fd(int in, int out, void *data)
        return (write_err || status);
 }
 
-static int apply_filter(const char *path, const char *src, size_t len, int fd,
+static int apply_single_file_filter(const char *path, const char *src, size_t len, int fd,
                         struct strbuf *dst, const char *cmd)
 {
        /*
@@ -456,12 +456,6 @@ static int apply_filter(const char *path, const char *src, size_t len, int fd,
        struct async async;
        struct filter_params params;
 
-       if (!cmd || !*cmd)
-               return 0;
-
-       if (!dst)
-               return 1;
-
        memset(&async, 0, sizeof(async));
        async.proc = filter_buffer_or_fd;
        async.data = &params;
@@ -493,6 +487,9 @@ static int apply_filter(const char *path, const char *src, size_t len, int fd,
        return !err;
 }
 
+#define CAP_CLEAN    (1u<<0)
+#define CAP_SMUDGE   (1u<<1)
+
 static struct convert_driver {
        const char *name;
        struct convert_driver *next;
@@ -501,6 +498,29 @@ static struct convert_driver {
        int required;
 } *user_convert, **user_convert_tail;
 
+static int apply_filter(const char *path, const char *src, size_t len,
+                       int fd, struct strbuf *dst, struct convert_driver *drv,
+                       const unsigned int wanted_capability)
+{
+       const char *cmd = NULL;
+
+       if (!drv)
+               return 0;
+
+       if (!dst)
+               return 1;
+
+       if ((CAP_CLEAN & wanted_capability) && drv->clean)
+               cmd = drv->clean;
+       else if ((CAP_SMUDGE & wanted_capability) && drv->smudge)
+               cmd = drv->smudge;
+
+       if (cmd && *cmd)
+               return apply_single_file_filter(path, src, len, fd, dst, cmd);
+
+       return 0;
+}
+
 static int read_convert_config(const char *var, const char *value, void *cb)
 {
        const char *key, *name;
@@ -839,7 +859,7 @@ int would_convert_to_git_filter_fd(const char *path)
        if (!ca.drv->required)
                return 0;
 
-       return apply_filter(path, NULL, 0, -1, NULL, ca.drv->clean);
+       return apply_filter(path, NULL, 0, -1, NULL, ca.drv, CAP_CLEAN);
 }
 
 const char *get_convert_attr_ascii(const char *path)
@@ -872,18 +892,12 @@ int convert_to_git(const char *path, const char *src, size_t len,
                    struct strbuf *dst, enum safe_crlf checksafe)
 {
        int ret = 0;
-       const char *filter = NULL;
-       int required = 0;
        struct conv_attrs ca;
 
        convert_attrs(&ca, path);
-       if (ca.drv) {
-               filter = ca.drv->clean;
-               required = ca.drv->required;
-       }
 
-       ret |= apply_filter(path, src, len, -1, dst, filter);
-       if (!ret && required)
+       ret |= apply_filter(path, src, len, -1, dst, ca.drv, CAP_CLEAN);
+       if (!ret && ca.drv && ca.drv->required)
                die("%s: clean filter '%s' failed", path, ca.drv->name);
 
        if (ret && dst) {
@@ -907,7 +921,7 @@ void convert_to_git_filter_fd(const char *path, int fd, struct strbuf *dst,
        assert(ca.drv);
        assert(ca.drv->clean);
 
-       if (!apply_filter(path, NULL, 0, fd, dst, ca.drv->clean))
+       if (!apply_filter(path, NULL, 0, fd, dst, ca.drv, CAP_CLEAN))
                die("%s: clean filter '%s' failed", path, ca.drv->name);
 
        crlf_to_git(path, dst->buf, dst->len, dst, ca.crlf_action, checksafe);
@@ -919,15 +933,9 @@ static int convert_to_working_tree_internal(const char *path, const char *src,
                                            int normalizing)
 {
        int ret = 0, ret_filter = 0;
-       const char *filter = NULL;
-       int required = 0;
        struct conv_attrs ca;
 
        convert_attrs(&ca, path);
-       if (ca.drv) {
-               filter = ca.drv->smudge;
-               required = ca.drv->required;
-       }
 
        ret |= ident_to_worktree(path, src, len, dst, ca.ident);
        if (ret) {
@@ -938,7 +946,7 @@ static int convert_to_working_tree_internal(const char *path, const char *src,
         * CRLF conversion can be skipped if normalizing, unless there
         * is a smudge filter.  The filter might expect CRLFs.
         */
-       if (filter || !normalizing) {
+       if ((ca.drv && ca.drv->smudge) || !normalizing) {
                ret |= crlf_to_worktree(path, src, len, dst, ca.crlf_action);
                if (ret) {
                        src = dst->buf;
@@ -946,8 +954,8 @@ static int convert_to_working_tree_internal(const char *path, const char *src,
                }
        }
 
-       ret_filter = apply_filter(path, src, len, -1, dst, filter);
-       if (!ret_filter && required)
+       ret_filter = apply_filter(path, src, len, -1, dst, ca.drv, CAP_SMUDGE);
+       if (!ret_filter && ca.drv && ca.drv->required)
                die("%s: smudge filter %s failed", path, ca.drv->name);
 
        return ret | ret_filter;