Flags and parameters to be parsed.
-SPECIFYING REVISIONS
---------------------
-
-A revision parameter typically, but not necessarily, names a
-commit object. They use what is called an 'extended SHA1'
-syntax. Here are various ways to spell object names. The
-ones listed near the end of this list are to name trees and
-blobs contained in a commit.
-
-* The full SHA1 object name (40-byte hexadecimal string), or
- a substring of such that is unique within the repository.
- E.g. dae86e1950b1277e545cee180551750029cfe735 and dae86e both
- name the same commit object if there are no other object in
- your repository whose object name starts with dae86e.
-
-* An output from 'git describe'; i.e. a closest tag, optionally
- followed by a dash and a number of commits, followed by a dash, a
- `g`, and an abbreviated object name.
-
-* A symbolic ref name. E.g. 'master' typically means the commit
- object referenced by refs/heads/master. If you
- happen to have both heads/master and tags/master, you can
- explicitly say 'heads/master' to tell git which one you mean.
- When ambiguous, a `<name>` is disambiguated by taking the
- first match in the following rules:
-
- . if `$GIT_DIR/<name>` exists, that is what you mean (this is usually
- useful only for `HEAD`, `FETCH_HEAD`, `ORIG_HEAD` and `MERGE_HEAD`);
-
- . otherwise, `refs/<name>` if exists;
-
- . otherwise, `refs/tags/<name>` if exists;
-
- . otherwise, `refs/heads/<name>` if exists;
-
- . otherwise, `refs/remotes/<name>` if exists;
-
- . otherwise, `refs/remotes/<name>/HEAD` if exists.
-+
-HEAD names the commit your changes in the working tree is based on.
-FETCH_HEAD records the branch you fetched from a remote repository
-with your last 'git fetch' invocation.
-ORIG_HEAD is created by commands that moves your HEAD in a drastic
-way, to record the position of the HEAD before their operation, so that
-you can change the tip of the branch back to the state before you ran
-them easily.
-MERGE_HEAD records the commit(s) you are merging into your branch
-when you run 'git merge'.
-+
-Note that any of the `refs/*` cases above may come either from
-the `$GIT_DIR/refs` directory or from the `$GIT_DIR/packed-refs` file.
-
-* A ref followed by the suffix '@' with a date specification
- enclosed in a brace
- pair (e.g. '\{yesterday\}', '\{1 month 2 weeks 3 days 1 hour 1
- second ago\}' or '\{1979-02-26 18:30:00\}') to specify the value
- of the ref at a prior point in time. This suffix may only be
- used immediately following a ref name and the ref must have an
- existing log ($GIT_DIR/logs/<ref>). Note that this looks up the state
- of your *local* ref at a given time; e.g., what was in your local
- `master` branch last week. If you want to look at commits made during
- certain times, see `--since` and `--until`.
-
-* A ref followed by the suffix '@' with an ordinal specification
- enclosed in a brace pair (e.g. '\{1\}', '\{15\}') to specify
- the n-th prior value of that ref. For example 'master@\{1\}'
- is the immediate prior value of 'master' while 'master@\{5\}'
- is the 5th prior value of 'master'. This suffix may only be used
- immediately following a ref name and the ref must have an existing
- log ($GIT_DIR/logs/<ref>).
-
-* You can use the '@' construct with an empty ref part to get at a
- reflog of the current branch. For example, if you are on the
- branch 'blabla', then '@\{1\}' means the same as 'blabla@\{1\}'.
-
-* The special construct '@\{-<n>\}' means the <n>th branch checked out
- before the current one.
-
-* The suffix '@\{upstream\}' to a ref (short form 'ref@\{u\}') refers to
- the branch the ref is set to build on top of. Missing ref defaults
- to the current branch.
-
-* A suffix '{caret}' to a revision parameter (e.g. 'HEAD{caret}') means the first parent of
- that commit object. '{caret}<n>' means the <n>th parent (i.e.
- 'rev{caret}'
- is equivalent to 'rev{caret}1'). As a special rule,
- 'rev{caret}0' means the commit itself and is used when 'rev' is the
- object name of a tag object that refers to a commit object.
-
-* A suffix '{tilde}<n>' to a revision parameter means the commit
- object that is the <n>th generation grand-parent of the named
- commit object, following only the first parent. I.e. rev~3 is
- equivalent to rev{caret}{caret}{caret} which is equivalent to
- rev{caret}1{caret}1{caret}1. See below for a illustration of
- the usage of this form.
-
-* A suffix '{caret}' followed by an object type name enclosed in
- brace pair (e.g. `v0.99.8{caret}\{commit\}`) means the object
- could be a tag, and dereference the tag recursively until an
- object of that type is found or the object cannot be
- dereferenced anymore (in which case, barf). `rev{caret}0`
- introduced earlier is a short-hand for `rev{caret}\{commit\}`.
-
-* A suffix '{caret}' followed by an empty brace pair
- (e.g. `v0.99.8{caret}\{\}`) means the object could be a tag,
- and dereference the tag recursively until a non-tag object is
- found.
-
-* A colon, followed by a slash, followed by a text (e.g. `:/fix nasty bug`): this names
- a commit whose commit message starts with the specified text.
- This name returns the youngest matching commit which is
- reachable from any ref. If the commit message starts with a
- '!', you have to repeat that; the special sequence ':/!',
- followed by something else than '!' is reserved for now.
-
-* A suffix ':' followed by a path (e.g. `HEAD:README`); this names the blob or tree
- at the given path in the tree-ish object named by the part
- before the colon.
- ':path' (with an empty part before the colon, e.g. `:README`)
- is a special case of the syntax described next: content
- recorded in the index at the given path.
-
-* A colon, optionally followed by a stage number (0 to 3) and a
- colon, followed by a path (e.g. `:0:README`); this names a blob object in the
- index at the given path. Missing stage number (and the colon
- that follows it, e.g. `:README`) names a stage 0 entry. During a merge, stage
- 1 is the common ancestor, stage 2 is the target branch's version
- (typically the current branch), and stage 3 is the version from
- the branch being merged.
-
-Here is an illustration, by Jon Loeliger. Both commit nodes B
-and C are parents of commit node A. Parent commits are ordered
-left-to-right.
-
-........................................
-G H I J
- \ / \ /
- D E F
- \ | / \
- \ | / |
- \|/ |
- B C
- \ /
- \ /
- A
-........................................
-
- A = = A^0
- B = A^ = A^1 = A~1
- C = A^2 = A^2
- D = A^^ = A^1^1 = A~2
- E = B^2 = A^^2
- F = B^3 = A^^3
- G = A^^^ = A^1^1^1 = A~3
- H = D^2 = B^^2 = A^^^2 = A~2^2
- I = F^ = B^3^ = A^^3^
- J = F^2 = B^3^2 = A^^3^2
-
-
-SPECIFYING RANGES
------------------
-
-History traversing commands such as 'git log' operate on a set
-of commits, not just a single commit. To these commands,
-specifying a single revision with the notation described in the
-previous section means the set of commits reachable from that
-commit, following the commit ancestry chain.
-
-To exclude commits reachable from a commit, a prefix `{caret}`
-notation is used. E.g. `{caret}r1 r2` means commits reachable
-from `r2` but exclude the ones reachable from `r1`.
-
-This set operation appears so often that there is a shorthand
-for it. When you have two commits `r1` and `r2` (named according
-to the syntax explained in SPECIFYING REVISIONS above), you can ask
-for commits that are reachable from r2 excluding those that are reachable
-from r1 by `{caret}r1 r2` and it can be written as `r1..r2`.
-
-A similar notation `r1\...r2` is called symmetric difference
-of `r1` and `r2` and is defined as
-`r1 r2 --not $(git merge-base --all r1 r2)`.
-It is the set of commits that are reachable from either one of
-`r1` or `r2` but not from both.
-
-Two other shorthands for naming a set that is formed by a commit
-and its parent commits exist. The `r1{caret}@` notation means all
-parents of `r1`. `r1{caret}!` includes commit `r1` but excludes
-all of its parents.
-
-Here are a handful of examples:
-
- D G H D
- D F G H I J D F
- ^G D H D
- ^D B E I J F B
- B...C G H D E B C
- ^D B C E I J F B C
- C^@ I J F
- F^! D G H D F
+include::revisions.txt[]
PARSEOPT
--------
(e.g. splits single switches aggregate values), a bit like `getopt(1)` does.
It takes on the standard input the specification of the options to parse and
-understand, and echoes on the standard output a line suitable for `sh(1)` `eval`
+understand, and echoes on the standard output a string suitable for `sh(1)` `eval`
to replace the arguments with normalized ones. In case of error, it outputs
usage on the standard error stream, and exits with code 129.
+Note: Make sure you quote the result when passing it to `eval`. See
+below for an example.
+
Input Format
~~~~~~~~~~~~
An option group Header
C? option C with an optional argument"
-eval `echo "$OPTS_SPEC" | git rev-parse --parseopt -- "$@" || echo exit $?`
+eval "$(echo "$OPTS_SPEC" | git rev-parse --parseopt -- "$@" || echo exit $?)"
------------
SQ-QUOTE