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builtin/am: introduce write_state_*() helper functions

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There are many calls to write_file() that repeat the same pattern in
the implementation of the builtin version of "am".  They all share
the same traits, i.e they

 - produce a text file with a single string in it;

 - have enough information to produce the entire contents of that
   file;

 - generate the pathname of the file by making a call to am_path(); and

 - they ask write_file() to die() upon failure.

The slight differences among the call sites throw them into roughly
three categories:

 - many write either "t" or "f" based on a boolean value to a file;

 - some write the integer value in decimal text;

 - some others write more general string, e.g. an object name in
   hex, an empty string (i.e. the presense of the file itself serves
   as a flag), etc.

Introduce three helpers, write_state_bool(), write_state_count() and
write_state_text(), to reduce direct calls to write_file().

This is a preparatory step for the next step to ensure that no
"state" file this command leaves in $GIT_DIR is with an incomplete
line at the end.

Suggested-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Junio C Hamano 2015-08-24 09:12:53 -07:00
parent b5e823594c
commit 25b763ba7a
1 changed files with 41 additions and 27 deletions
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68
builtin/am.c
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@ -193,6 +193,27 @@ static inline const char *am_path(const struct am_state *state, const char *path
return mkpath("%s/%s", state->dir, path);
}
/**
* For convenience to call write_file()
*/
static int write_state_text(const struct am_state *state,
const char *name, const char *string)
{
return write_file(am_path(state, name), 1, "%s", string);
}
static int write_state_count(const struct am_state *state,
const char *name, int value)
{
return write_file(am_path(state, name), 1, "%d", value);
}
static int write_state_bool(const struct am_state *state,
const char *name, int value)
{
return write_state_text(state, name, value ? "t" : "f");
}
/**
* If state->quiet is false, calls fprintf(fp, fmt, ...), and appends a newline
* at the end.
@ -362,7 +383,7 @@ static void write_author_script(const struct am_state *state)
sq_quote_buf(&sb, state->author_date);
strbuf_addch(&sb, '\n');
write_file(am_path(state, "author-script"), 1, "%s", sb.buf);
write_state_text(state, "author-script", sb.buf);
strbuf_release(&sb);
}
@ -1000,13 +1021,10 @@ static void am_setup(struct am_state *state, enum patch_format patch_format,
if (state->rebasing)
state->threeway = 1;
write_file(am_path(state, "threeway"), 1, state->threeway ? "t" : "f");
write_file(am_path(state, "quiet"), 1, state->quiet ? "t" : "f");
write_file(am_path(state, "sign"), 1, state->signoff ? "t" : "f");
write_file(am_path(state, "utf8"), 1, state->utf8 ? "t" : "f");
write_state_bool(state, "threeway", state->threeway);
write_state_bool(state, "quiet", state->quiet);
write_state_bool(state, "sign", state->signoff);
write_state_bool(state, "utf8", state->utf8);
switch (state->keep) {
case KEEP_FALSE:
@ -1022,9 +1040,8 @@ static void am_setup(struct am_state *state, enum patch_format patch_format,
die("BUG: invalid value for state->keep");
}
write_file(am_path(state, "keep"), 1, "%s", str);
write_file(am_path(state, "messageid"), 1, state->message_id ? "t" : "f");
write_state_text(state, "keep", str);
write_state_bool(state, "messageid", state->message_id);
switch (state->scissors) {
case SCISSORS_UNSET:
@ -1039,24 +1056,23 @@ static void am_setup(struct am_state *state, enum patch_format patch_format,
default:
die("BUG: invalid value for state->scissors");
}
write_file(am_path(state, "scissors"), 1, "%s", str);
write_state_text(state, "scissors", str);
sq_quote_argv(&sb, state->git_apply_opts.argv, 0);
write_file(am_path(state, "apply-opt"), 1, "%s", sb.buf);
write_state_text(state, "apply-opt", sb.buf);
if (state->rebasing)
write_file(am_path(state, "rebasing"), 1, "%s", "");
write_state_text(state, "rebasing", "");
else
write_file(am_path(state, "applying"), 1, "%s", "");
write_state_text(state, "applying", "");
if (!get_sha1("HEAD", curr_head)) {
write_file(am_path(state, "abort-safety"), 1, "%s", sha1_to_hex(curr_head));
write_state_text(state, "abort-safety", sha1_to_hex(curr_head));
if (!state->rebasing)
update_ref("am", "ORIG_HEAD", curr_head, NULL, 0,
UPDATE_REFS_DIE_ON_ERR);
} else {
write_file(am_path(state, "abort-safety"), 1, "%s", "");
write_state_text(state, "abort-safety", "");
if (!state->rebasing)
delete_ref("ORIG_HEAD", NULL, 0);
}
@ -1066,9 +1082,8 @@ static void am_setup(struct am_state *state, enum patch_format patch_format,
* session is in progress, they should be written last.
*/
write_file(am_path(state, "next"), 1, "%d", state->cur);
write_file(am_path(state, "last"), 1, "%d", state->last);
write_state_count(state, "next", state->cur);
write_state_count(state, "last", state->last);
strbuf_release(&sb);
}
@ -1101,12 +1116,12 @@ static void am_next(struct am_state *state)
unlink(am_path(state, "original-commit"));
if (!get_sha1("HEAD", head))
write_file(am_path(state, "abort-safety"), 1, "%s", sha1_to_hex(head));
write_state_text(state, "abort-safety", sha1_to_hex(head));
else
write_file(am_path(state, "abort-safety"), 1, "%s", "");
write_state_text(state, "abort-safety", "");
state->cur++;
write_file(am_path(state, "next"), 1, "%d", state->cur);
write_state_count(state, "next", state->cur);
}
/**
@ -1479,8 +1494,7 @@ static int parse_mail_rebase(struct am_state *state, const char *mail)
write_commit_patch(state, commit);
hashcpy(state->orig_commit, commit_sha1);
write_file(am_path(state, "original-commit"), 1, "%s",
sha1_to_hex(commit_sha1));
write_state_text(state, "original-commit", sha1_to_hex(commit_sha1));
return 0;
}
@ -1782,7 +1796,7 @@ static void am_run(struct am_state *state, int resume)
refresh_and_write_cache();
if (index_has_changes(&sb)) {
write_file(am_path(state, "dirtyindex"), 1, "t");
write_state_bool(state, "dirtyindex", 1);
die(_("Dirty index: cannot apply patches (dirty: %s)"), sb.buf);
}