mirror of
https://github.com/fish-shell/fish-shell
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cfc06203e7
--inherit-variable takes a variable name and snapshots its current value. When the function is executed, it will have a local variable with this value already defined. Printing the function source will include synthesized `set -l` lines for the values. This is primarily useful for functions that are created on the fly, such as in `psub`.
259 lines
7.1 KiB
C++
259 lines
7.1 KiB
C++
/** \file env.h
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Prototypes for functions for setting and getting environment variables.
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*/
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#ifndef FISH_ENV_H
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#define FISH_ENV_H
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#include <wchar.h>
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#include <map>
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#include "util.h"
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#include "common.h"
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/* Flags that may be passed as the 'mode' in env_set / env_get_string */
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enum
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{
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/* Default mode */
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ENV_DEFAULT = 0,
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/** Flag for local (to the current block) variable */
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ENV_LOCAL = 1,
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/** Flag for exported (to commands) variable */
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ENV_EXPORT = 2,
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/** Flag for unexported variable */
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ENV_UNEXPORT = 16,
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/** Flag for global variable */
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ENV_GLOBAL = 4,
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/** Flag for variable update request from the user. All variable
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changes that are made directly by the user, such as those from the
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'set' builtin must have this flag set. */
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ENV_USER = 8,
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/** Flag for universal variable */
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ENV_UNIVERSAL = 32
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};
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typedef uint32_t env_mode_flags_t;
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/**
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Error code for trying to alter read-only variable
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*/
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enum
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{
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ENV_PERM = 1,
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ENV_SCOPE,
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ENV_INVALID
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}
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;
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/* A struct of configuration directories, determined in main() that fish will optionally pass to env_init.
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*/
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struct config_paths_t
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{
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wcstring data; // e.g. /usr/local/share
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wcstring sysconf; // e.g. /usr/local/etc
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wcstring doc; // e.g. /usr/local/share/doc/fish
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wcstring bin; // e.g. /usr/local/bin
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};
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/**
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Initialize environment variable data
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*/
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void env_init(const struct config_paths_t *paths = NULL);
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/**
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Set the value of the environment variable whose name matches key to val.
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Memory policy: All keys and values are copied, the parameters can and should be freed by the caller afterwards
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\param key The key
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\param val The value
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\param mode The type of the variable. Can be any combination of ENV_GLOBAL, ENV_LOCAL, ENV_EXPORT and ENV_USER. If mode is zero, the current variable space is searched and the current mode is used. If no current variable with the same name is found, ENV_LOCAL is assumed.
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\returns 0 on suicess or an error code on failiure.
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The current error codes are:
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* ENV_PERM, can only be returned when setting as a user, e.g. ENV_USER is set. This means that the user tried to change a read-only variable.
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* ENV_SCOPE, the variable cannot be set in the given scope. This applies to readonly/electric variables set from the local or universal scopes, or set as exported.
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* ENV_INVALID, the variable value was invalid. This applies only to special variables.
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*/
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int env_set(const wcstring &key, const wchar_t *val, env_mode_flags_t mode);
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/**
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Return the value of the variable with the specified name. Returns 0
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if the key does not exist. The returned string should not be
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modified or freed. The returned string is only guaranteed to be
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valid until the next call to env_get(), env_set(), env_push() or
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env_pop() takes place.
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*/
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//const wchar_t *env_get( const wchar_t *key );
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class env_var_t : public wcstring
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{
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private:
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bool is_missing;
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public:
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static env_var_t missing_var(void)
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{
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env_var_t result(L"");
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result.is_missing = true;
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return result;
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}
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env_var_t(const env_var_t &x) : wcstring(x), is_missing(x.is_missing) { }
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env_var_t(const wcstring & x) : wcstring(x), is_missing(false) { }
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env_var_t(const wchar_t *x) : wcstring(x), is_missing(false) { }
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env_var_t() : wcstring(L""), is_missing(false) { }
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bool missing(void) const
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{
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return is_missing;
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}
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bool missing_or_empty(void) const
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{
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return missing() || empty();
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}
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const wchar_t *c_str(void) const;
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env_var_t &operator=(const env_var_t &s)
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{
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is_missing = s.is_missing;
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wcstring::operator=(s);
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return *this;
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}
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bool operator==(const env_var_t &s) const
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{
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return is_missing == s.is_missing && static_cast<const wcstring &>(*this) == static_cast<const wcstring &>(s);
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}
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bool operator==(const wcstring &s) const
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{
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return ! is_missing && static_cast<const wcstring &>(*this) == s;
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}
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bool operator!=(const env_var_t &s) const
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{
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return !(*this == s);
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}
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bool operator!=(const wcstring &s) const
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{
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return !(*this == s);
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}
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bool operator==(const wchar_t *s) const
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{
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return ! is_missing && static_cast<const wcstring &>(*this) == s;
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}
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bool operator!=(const wchar_t *s) const
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{
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return !(*this == s);
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}
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};
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/**
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Gets the variable with the specified name, or env_var_t::missing_var if it does not exist or is an empty array.
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\param key The name of the variable to get
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\param mode An optional scope to search in. All scopes are searched if unset
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*/
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env_var_t env_get_string(const wcstring &key, env_mode_flags_t mode = ENV_DEFAULT);
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/**
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Returns true if the specified key exists. This can't be reliably done
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using env_get, since env_get returns null for 0-element arrays
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\param key The name of the variable to remove
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\param mode the scope to search in. All scopes are searched if set to default
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*/
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bool env_exist(const wchar_t *key, env_mode_flags_t mode);
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/**
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Remove environemnt variable
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\param key The name of the variable to remove
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\param mode should be ENV_USER if this is a remove request from the user, 0 otherwise. If this is a user request, read-only variables can not be removed. The mode may also specify the scope of the variable that should be erased.
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\return zero if the variable existed, and non-zero if the variable did not exist
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*/
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int env_remove(const wcstring &key, int mode);
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/**
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Push the variable stack. Used for implementing local variables for functions and for-loops.
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*/
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void env_push(bool new_scope);
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/**
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Pop the variable stack. Used for implementing local variables for functions and for-loops.
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*/
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void env_pop();
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/** Synchronizes all universal variable changes: writes everything out, reads stuff in */
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void env_universal_barrier();
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/** Returns an array containing all exported variables in a format suitable for execv. */
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const char * const * env_export_arr(bool recalc);
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/**
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Returns all variable names.
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*/
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wcstring_list_t env_get_names(int flags);
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/** Update the PWD variable directory */
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int env_set_pwd();
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/* Returns the PWD with a terminating slash */
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wcstring env_get_pwd_slash();
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class env_vars_snapshot_t
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{
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std::map<wcstring, wcstring> vars;
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bool is_current() const;
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public:
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env_vars_snapshot_t(const wchar_t * const * keys);
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env_vars_snapshot_t(void);
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env_var_t get(const wcstring &key) const;
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// Returns the fake snapshot representing the live variables array
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static const env_vars_snapshot_t ¤t();
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// vars necessary for highlighting
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static const wchar_t * const highlighting_keys[];
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};
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extern bool g_log_forks;
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extern int g_fork_count;
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extern bool g_use_posix_spawn;
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/**
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A variable entry. Stores the value of a variable and whether it
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should be exported.
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*/
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struct var_entry_t
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{
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wcstring val; /**< The value of the variable */
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bool exportv; /**< Whether the variable should be exported */
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var_entry_t() : exportv(false) { }
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};
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typedef std::map<wcstring, var_entry_t> var_table_t;
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#endif
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